Introduction Against the general trend of the UV-curing industry advancing toward solvent-free, low VOC, high safety and long-term weather resistance, regulatory thresholds for photoinitiator systems keep rising in sectors including food-contact packaging, medical polymers, ophthalmic optical materials, flexible electronics and high-end optical films. Conventional small-molecule benzophenone Type II photoinitiators feature excellent surface cure, good resistance to oxygen inhibition and cost advantages. Nevertheless, lacking polymerizable groups, free small molecules tend to migrate out of the cured film to the surface after curing, resulting in blooming, exudation, odor and excessive contact migration. Such drawbacks make it difficult to pass EU 10/2011, FDA, Chinese domestic food-contact material and medical device extractables & leachables tests, which has long restricted the commercialization of high-end formulations. The copolymerizable reactive Type II hydrogen-abstraction benzophenone series provides a solution via molecular structure design: the benzophenone photosensitive chromophore is grafted with acrylate or methacrylate polymerizable double bonds through flexible ether linkages. During UV irradiation and curing, the molecule acts as a hydrogen-abstraction photoinitiator. Together with a co-initiating amine, it generates active free radicals to drive crosslinking polymerization of acrylate systems. Meanwhile, its carbon-carbon double bonds participate in polymerization and are covalently bonded permanently into the 3D crosslinked network, rather than existing as free small molecules. This fundamentally reduces the risk of migration, exudation and blooming, making it one of the core raw materials for developing low-migration UV formulations. This product line is divided into two structural subfamilies: ortho-hydroxy substituted benzophenone monomers and non-ortho-hydroxy pure initiator benzophenone monomers. The two routes have clearly differentiated performance positioning to meet diverse formulation requirements, covering multiple differentiated grades (CAS: 2149581-44-0, 1137971-16-4, 16432-81-8, 16613-04-0, 2035-72-5, 15419-94-0). Compatible with mercury lamps and 365/385/405 nm LED light sources, it works with mainstream systems including solvent-free UV, waterborne UV and high-solid UV. I. Core Molecular Characteristics & Performance Advantages 1.Covalently locked, low migration and low exudation  Unlike common small-molecule BP and 4-BPB, these monomers carry copolymerizable double bonds and are firmly anchored in the resin backbone after curing. Extractables from cured films are greatly reduced to satisfy high-level safety compliance, suitable for applications with long-term human or food contact. 1. Classic Type II hydrogen-abstraction mechanism, outstanding surface cure and excellent anti-oxygen inhibition  It does not generate free radicals via direct cleavage but initiates polymerization through hydrogen abstraction. It performs remarkably well on the surface layer — the most problematic zone in UV curing, effectively alleviating tackiness and surface under-cure. It shows prominent advantages in thin coatings, high-speed processing and air-curing production lines. Co-use with amine co-initiators is mandatory. Reactive copolymerizable amines in the same system are preferred to further minimize migration of the whole system. 2. Ortho-hydroxy grades: integrated photoinitiation + UV absorption dual function  The ortho-hydroxy group on the benzene ring forms intramolecular hydrogen bonds and delivers stable UV absorption. After crosslinking, the embedded groups continuously act as UV stabilizers inside the cured film, suppressing photo-oxidative degradation of polymer chains and long-term yellowing and chalking. Formulation complexity is lowered, and the dosage of extra UV absorbers and HALS light stabilizers can be reduced. 3. Non-ortho-hydroxy grades: high light transmittance, low background interference, dedicated to surface initiation Without  intramolecular hydrogen-bonded UV-absorbing structures, they offer higher transmittance in the visible range and will not impair transparency and clarity of transparent optical substrates, lens coatings and high-definition protective films. Developed specifically for optical formulations with strict requirements on light transmission. 4. Flexible ether backbone, broad compatibility  Ethoxy and diethoxy flexible ether segments are incorporated into the molecular backbone to reduce rigidity. It exhibits excellent compatibility with polyurethane acrylate, epoxy acrylate, polyester acrylate, pure acrylic resins and various reactive diluent monomers, avoiding phase separation, exudation and haze rise. Ether linkages also endow the cured film with certain toughness to mitigate cracking. 5. Differentiated double bond types: acrylate vs methacrylate  Acrylate double bonds feature higher reactivity, faster cure speed and more flexible films, ideal for inks, pressure-sensitive adhesives and flexible film coatings. Methacrylate double bonds have moderate reactivity, higher homopolymer rigidity and better thermal stability, suited for optical comonomers, hard coats and heat-resistant functional resins. II. Detailed Application Segments   1.Food-contact packaging: UV inks, overprint varnish (OPV), laminating adhesives (core major segment)  UV inks for flexible food packaging, labels, paper-plastic color boxes, lamination varnish and plastic-plastic laminating UV adhesives represent the largest consumption scenarios. In high-speed flexo, offset, screen and digital inkjet formulations, conventional benzophenone readily migrates to the food-contacting inner layer with high compliance risks. After curing, these copolymerizable monomers are covalently locked in the film with controllable migration, applicable to white inks, colored inks, matte varnish and glossy overprint varnish requiring food-contact certification. Ortho-hydroxy grades provide post-cure weather resistance for outer packaging against yellowing during long-term display. Acrylate long-ether grades deliver good flowability and fast surface dryness, matching high-speed printing lines and reducing plate clogging, roll sticking and backside offset. 2. Ophthalmic polymers, contact lenses, intraocular lenses (high-value specialty segment) CAS 16432-81-8 and 16613-04-0, two ortho-hydroxy methacrylate-modified benzophenones, are landmark materials for this field. In silicone hydrogel and hydrogel contact lens and intraocular lens monomer systems, they are not merely external photoinitiators but copolymerizable functional monomers participating in bulk polymerization of lenses. They initiate hydrogel crosslinking and are evenly distributed inside the lens matrix to block UV light, eliminating the need for a secondary UV protective coating. Benefits: functional groups are uniformly dispersed throughout the lens bulk with no risk of coating delamination. Low extractables and low cellular irritation meet biocompatibility requirements for ophthalmic materials, serving as key raw materials for high-end UV-blocking contact lens formulations.   3.Light-curable coatings and adhesives for medical consumables  Outer coatings for single-use interventional catheters, medical UV adhesives, microfluidic chip photosensitive coatings, auxiliary dental fixation resins and protective coatings for surgical instruments. Medical applications impose strict controls on extractables, leachables and cytotoxicity. Exudation of small-molecule initiators will cause excessive leachables. When paired with reactive amine co-initiators, this reactive benzophenone series yields very low free fractions and stable cured films. Fast curing adapts to automated dispensing and dip-coating lines for UV coating modification of PVC, TPU and polyolefin medical substrates. 3. Optical films, transparent UV optical adhesives, lens protective coatings  Two selection logics: *High-definition optical hard coats, lens coatings, glass/PMMA laminating optical adhesives, display protective films: prefer non-ortho-hydroxy grades (CAS 2035-72-5, 15419-94-0). Weak UV absorption and high transmittance preserve optical clarity while delivering robust surface cure to eliminate tackiness of transparent adhesive layers. *Outdoor optical films requiring weathering and anti-aging performance: select ortho-hydroxy dual-functional grades for both curing and long-term anti-yellowing. 4. Flexible electronics, FPC & PCB photosensitive materials  FPC solder mask inks, reinforcing adhesives, auxiliary curing components for PCB green solder masks, UV adhesives for electronic component positioning and fixing, auxiliary encapsulation coatings around chips. Electronic components generate heat during operation; migration and exudation of free small molecules may degrade insulation, cause interface contamination and corrode circuits. The low-migration feature ensures long-term electrical stability, compatible with thin flexible circuits. The cured film maintains flexibility and resists cracking upon substrate bending. 5. SLA / DLP / LCD UV-curable 3D printing photosensitive resins  Industrial precision printing resins, functional prototype resins and biological model resins. The Type II initiation system delivers strong surface curing to reduce top-layer tackiness and blurred patterns on printed parts. Low migration fits consumer prototypes and in-vitro biological models with direct contact. Ortho-hydroxy grades improve yellowing resistance of printed parts during outdoor storage. It can be compounded with Type I initiators such as TPO and BAPO to balance deep cure and surface dryness. 6. Industrial weather-resistant UV coatings: plastics, home appliances, wood, outdoor decorative topcoats  UV coatings for home appliance housings, wood cabinet clear coats and outdoor decorative board topcoats. After crosslinking, ortho-hydroxy dual-functional grades inherently provide UV stabilization, slowing oxidative degradation, yellowing and gloss loss under sunlight UV exposure and reducing the addition of extra light stabilizers in formulations. Ether segments improve adhesion on ABS, PC, PMMA, solid wood and MDF. 7. Waterborne UV systems, low-odor eco-friendly formulations  Waterborne polyurethane acrylate and waterborne epoxy acrylate emulsion systems. Ether-modified monomers in this series show good compatibility with aqueous resin emulsions, applicable to waterborne UV overprint varnish and waterborne inks to cut overall formulation odor and satisfy low-odor workshop environmental requirements. III. Grade Selection Guide *CAS 2149581-44-0 | 2-Hydroxy-4-acryloyloxyethoxybenzophenone | Ortho-hydroxy, acrylate double bond, flexible, dual-functional. Preferred for food inks, medical coatings and waterborne UV *CAS 1137971-16-4 | 2-Methacryloxy-2-(4-benzoyl-3-hydroxyphenoxy)ethyl ether | Ortho-hydroxy, long ether chain, methacrylate, high toughness. Flexible packaging inks, weather-resistant topcoats, flexible films *CAS 16432-81-8 | 2-Hydroxy-4-(methacryloyloxy)benzophenone | Ortho-hydroxy, methacrylate, high rigidity. Core grade for ophthalmic lenses and intraocular lenses *CAS 16613-04-0 | 2-Hydroxy-4-acryloyloxybenzophenone | Ortho-hydroxy, short ether chain, dual initiation + UV absorption. Ophthalmic applications, PCB, high-end transparent weather-resistant coatings *CAS 2035-72-5 | 2-[2-(4-Benzoylphenoxy)ethoxy]ethyl methacrylate | Non-ortho-hydroxy, methacrylate, high transmittance. Optical adhesives, lens coatings, high-definition hard coats *CAS 15419-94-0 | 2-[2-(4-Benzoylphenoxy)ethoxy]ethyl acrylate | Non-ortho-hydroxy, acrylate, flexible. Printing inks, film overprint varnish, pressure-sensitive adhesives IV. Formulation Guidelines 1.Mechanism limitation: All grades are Type II hydrogen-abstraction photoinitiators and cannot cure independently. Amine co-initiators are required. Reactive copolymerizable amines are strongly recommended for maximum low-migration performance; common small-molecule amines such as triethylamine and DMA are not recommended. 2.Dosage: Typical loading: 2%–6% based on total mass of resin + monomers. Dosage may be increased for pigmented thick films. Lower loading is recommended for transparent optical formulations to avoid background color affecting light transmission. 3.Light source compatibility: Main absorption lies in UVA region, compatible with conventional mercury lamps and 365/385 nm LED. Activity is weak under 405 nm LED; it is not suitable as the sole primary initiator for 405 nm systems but can be used as an auxiliary component for surface curing. 4.Storage control: Containing acrylate double bonds, store in sealed, light-shielded and low-temperature conditions with small amounts of polymerization inhibitor to prevent premature thermal polymerization. 5.Blending strategy: For balanced deep curing, blend with Type I photoinitiators including TPO, BAPO, 184 and 1173. Type I initiators handle deep cure while this series resolves surface tackiness. Closing With tightening global regulations on material safety for consumer goods, packaging and medical devices, low-migration copolymerizable photosensitive functional monomers are evolving from “optional additives” into mandatory raw materials for high-end UV formulations. This reactive benzophenone portfolio, with differentiated designs of double bond type, ether chain length and hydroxyl substitution, covers packaging printing, ophthalmic optics, medical consumables, flexible electronics, 3D printing and industrial coatings. It supports domestic UV material manufacturers in independent development of high-end formulations and import substitution, delivering UV curing solutions compliant with global regulatory standards.

Tired of long-term aging and yellowing of UV-cured articles, blooming and migration of additives, surface hazing, and failed compliance tests due to extractables? Conventional small-molecule UV absorbers are simply blended into resin systems and remain free within the cured film network. Over time, migration and bleeding occur under heat, water immersion, friction and weathering: reduced transparency of optical films, excessive extractable risks for medical coatings, migration contamination concerns for food packaging, and gloss loss & cracking of outdoor inks. Many high-end export formulas hit a bottleneck on low-migration requirements and cannot be approved.   CAS 2035-72-5｜2-Hydroxy-4-(methacryloyloxy)benzophenone (commonly known as UV725) A reactive benzophenone UV-absorbing functional monomer equipped with polymerizable double bonds, breaking the limitations of traditional additive light stabilizers from the fundamental mechanism! ✅ 【Covalently Bonded into Resin Matrix — Truly Non-Migratory, Non-Bleeding, Non-Blooming】 Its molecular structure carries reactive methacrylate double bonds. During UV curing / thermal curing crosslinking, it directly participates in free-radical copolymerization and is firmly grafted into the polymer crosslink network instead of existing as free small molecules. No migration or bleeding out of coatings and resins under warm water immersion, high-low temperature cycling or long-term outdoor exposure. It perfectly addresses the most challenging extractables control requirements for highly regulated industries. ✅ 【Broadband UV Blocking for Long-Term Anti-Yellowing & Anti-Aging Performance】 Characteristic absorption range: 280–360 nm, fully covering harmful UVB and UVA bands. Based on the classic intramolecular hydrogen bond reversible proton transfer mechanism of benzophenone, it safely converts destructive UV energy into harmless thermal energy without generating free-radical by-products. It continuously suppresses the photo-oxidative degradation chain reaction of resins, protecting substrates sustainably: films resist yellowing, cracking, gloss loss and hazing, greatly extending service life under weathering. ✅ 【High Transparency & Formulation Compatibility with Mainstream UV-Curing Systems】 Appearance: white to pale yellow crystalline powder; melting point: 77~79℃; insoluble in water, highly soluble in acetone, ethyl acetate, toluene and various acrylic monomers and oligomers. It exhibits excellent compatibility with most UV-curing systems including epoxy acrylate, polyurethane acrylate and pure acrylic resins. Within the recommended dosage range, it has minimal adverse impact on curing speed, surface cure and through cure. Cured films maintain high light transmittance and will not impair the clarity of optical films and transparent components, ideal for high-transparency applications. ✅ 【Premium Choice for Highly Regulated Applications, Suitable for Demanding Scenarios】   ▫️Optics: PET/PC optical protective films, release films, transparent functional films — no hazing or yellowing over service time ▫️Medical Consumables: UV-cured coatings for medical catheters and auxiliary implant components, meeting low-extractable specifications ▫️Food-Contact Packaging: UV-curable inks and overprint varnishes for food packaging to mitigate additive migration risks ▫️Outdoor Weatherable Materials: Weather-resistant topcoats for outdoor plastics and wood, outdoor marking inks ▫️Additive Manufacturing: SLA/DLP photopolymer 3D printing resins, preventing yellowing and embrittlement of printed parts during storage ▫️Flexible Electronics: Protective coatings on flexible substrates Comparison with conventional UV absorbers: Traditional additive-type UV absorbers are merely “mixed in”, while UV725 is “chemically built into the resin”. The difference in short-term anti-yellowing performance is limited, but the performance gap widens dramatically after aging tests, extraction tests and long-term real-time aging. For UV-curing formulas exported to Europe and the US that require FDA compliance, food-contact approval, low extractables for medical use and high optical grade, UV725 (CAS 2035-72-5) is the preferred functional monomer balancing weather resistance, optical clarity and safety. As UV-curing products keep upgrading and downstream standards for aging and extractables become stricter year by year, selecting the right light-stabilizing monomer directly helps you avoid formula failure, rejected samples and lost orders. CAS 2035-72-5: Equip your high-end UV-curing formulations with a long-lasting UV protection lock!

With the rapid development of UV curing industry towards outdoor application, optical grade, low extractable and food-contact compliance, conventional small-molecule UV absorbers face a well-known technical bottleneck. They are only physically blended inside resin matrix. Under thermal cycling, humidity fluctuation, long-term UV exposure and solvent contact, these additives easily migrate to coating surface, bloom, precipitate or volatilize. Gradual loss of UV protection leads to fast yellowing, gloss reduction, chalking and cracking. Blooming also causes haze, odor and surface contamination, which blocks the application in optical film, food packaging and medical coating sectors. CAS 2035-72-5, 2-Hydroxy-4-(methacryloyloxy)benzophenone (BHPMA, UV724), is a copolymerizable functional monomer integrating benzophenone UV chromophore and methacrylate reactive double bond. Different from additive light stabilizers, it delivers permanent UV protection via covalent bonding into crosslinked polymer network. It appears as white to pale yellow crystalline powder, commercial purity ≥98% or ≥99% (GC). Melting point: 77–79℃, predicted boiling point: 437.4℃, density: 1.219 g/cm³. Insoluble in water, freely soluble in acetone, ethyl acetate, toluene and common acrylic reactive diluents. It has excellent compatibility with urethane acrylate, epoxy acrylate and other UV oligomers. It will not induce haze or turbidity for clear coatings and retains high transmittance, ideal for optical-grade requirements. MEHQ inhibitor (~3000ppm) is added to prevent premature self-polymerization during storage. Within recommended dosage range, it has minor influence on curing speed, easy to substitute into existing formulations. Its anti-aging mechanism relies on ESIPT (Excited State Intramolecular Proton Transfer). The intramolecular hydrogen bond between ortho-hydroxyl and carbonyl absorbs UVA/UVB from 280–360 nm, and converts harmful UV energy into harmless heat non-radiatively, suppressing photo-oxidative chain scission and yellowing. The methacrylate double bond copolymerizes with acrylic monomers/oligomers during UV or thermal radical curing, chemically anchored into polymer network. No free residual small molecule remains after cure, which fundamentally prevents migration, blooming, solvent extraction and thermal volatilization, delivering persistent weather resistance. Meanwhile, the benzophenone moiety can act as hydrogen abstraction photoactive group to assist surface curing in selected systems. Recommended loading level is 0.5–3.0 wt%. It can be used alone or synergistically combined with HALS and other UV absorbers to achieve superior performance in QUV and xenon accelerated aging tests. Pre-formulation screening on blooming, aging and compatibility is suggested for each system. Typical Application Segments   *Outdoor UV coatings: wood varnish, plastic hard coat, architectural UV finish, long-term exterior protection *Optical film hardcoat: PET / PC / PMMA protective film, display substrate coating, high-transparency anti-yellowing layer *UV inks & overprint varnish: food-contact compliant overprint lacquer, flexible packaging printing ink, low migration requirement *UV adhesive: lamination adhesive, flexible film bonding adhesive, avoid interface contamination from migrated additives *Photopolymer resin for 3D printing & precision lithography, stabilize dimension and suppress yellowing *Specialty substrates: medical UV coating, ophthalmic materials and composite impregnation requiring low extractables We supply this product with stable commercial production and consistent batch-to-batch quality. COA is available for each lot, including GC/HPLC, moisture, melting point and transmittance data. Sample, pilot and bulk orders are acceptable. Our technical team supports formulation recommendation, aging benchmarking and compliance documentation. Storage instruction: Keep tightly sealed, store in cool, dry and dark warehouse, away from heat, direct sunlight and strong oxidants to avoid self-polymerization. Operate in accordance with SDS. As a premium reactive light stabilizer, CAS 2035-72-5 (UV724) is an ideal drop-in upgrade for traditional benzophenone absorbers, widely adopted in outdoor, optical and low-migration UV formulations, helping manufacturers solve blooming, migration and aging pain points and develop durable, compliant UV curable products. Product Info CAS No.: 2035-72-5 Chemical Name: 2-Hydroxy-4-(methacryloyloxy)benzophenone Alias: 4-Benzoyl-3-hydroxyphenyl methacrylate, BHPMA, UV724 Formula: C17H14O4 MW: 282.29

Benefiting from fast film formation, low VOC, energy efficiency and high productivity, UV curing technology keeps replacing conventional solvent-borne systems in wood coatings, plastics, optics, 3D printing, electronic adhesives, inks and other sectors. Nevertheless, outdoor UV-curable formulations have long faced a common challenge. Conventional small-molecule UV absorbers (BP-1, UV-531, etc.) are only physically blended and dispersed inside resins. Under prolonged sunlight exposure, rainwater leaching, solvent wiping and high-temperature ageing, they tend to migrate, bleed out and bloom. This leads to rapid yellowing, gloss loss, chalking and cracking of coatings. The exudates may also contaminate contact surfaces, reduce coating adhesion and impair the transmittance of transparent articles, which greatly limits their application in optical films, food-contact materials and high-end electronic materials.   CAS 15419-94-0, 2-Hydroxy-4-acryloyloxybenzophenone (commercial name BP-1A), is a reactive copolymerizable UV-absorbing monomer with a benzophenone backbone. It is developed specifically to address the above pain points and has been widely adopted in high-end UV-curable formulations in recent years. Its molecular formula is C₁₆H₁₂O₄. The molecular structure contains two key functional moieties: one is the classic ortho-hydroxybenzophenone chromophore responsible for UV capture and photostabilization; the other is a polymerizable acryloyloxy double bond, which is the core distinction from ordinary benzophenone UV absorbers. During UV free-radical curing, the acryloyl double bond undergoes free-radical addition reaction simultaneously with acrylate oligomers, reactive diluents and other co-monomers. It is permanently anchored into the 3D crosslinked resin network via covalent bonds instead of existing as free small molecules, fundamentally eliminating migration, bleeding and solvent extraction loss. In terms of spectral absorption, BP-1A covers 280–400 nm, including the full UVB range and most of the UVA range, with an absorption peak at approximately 310–330 nm. Its stabilization mechanism relies on reversible intramolecular hydrogen-bond proton transfer. After absorbing UV energy, it converts high-energy ultraviolet radiation into harmless low-grade heat, suppressing photo-oxidative degradation of resin chains and effectively retarding coating yellowing, gloss decline and mechanical strength deterioration, so as to protect substrates from UV erosion. Compared with non-reactive BP series, at the same loading level, the formulation retains far superior photostability after accelerated ageing, xenon lamp ageing, water immersion and alcohol resistance tests, showing outstanding long-term protection performance. For formulation compatibility, BP-1A exhibits good compatibility with most acrylate oligomers, mono-/multi-functional reactive monomers and free-radical photoinitiators (1173, 184, TPO, 819, etc.). At low dosage, it will not significantly affect curing speed, coating transparency, hardness or adhesion. It is compatible with solvent-free UV systems, solvent-thinned UV systems and waterborne UV emulsions. It is generally a pale yellow crystal or low-melting solid with a melting point around 30 °C. It can be pre-dissolved with monomers and oligomers at ambient temperature for easy feeding, with low risk of poor dissolution and agglomeration. The recommended loading is 0.5–3.0 wt%, adjustable according to outdoor durability grade, film thickness and substrate requirements. Mature industrial formulations usually combine it with HALS (hindered amine light stabilizers) to build a synergistic weathering system of “UV absorption + free radical scavenging”, further extending the anti-ageing lifespan — this is a classic weathering combination for outdoor UV coatings. Application Segments   1. Outdoor UV clear coats for wood: UV topcoats for garden wood decks, outdoor preservative wood and wooden doors & windows. It prevents sunlight-induced yellowing, weathering agent loss from rain washout and coating whitening/gloss loss while maintaining the transparent texture of wood grain. 2. UV topcoats for plastics / modified plastic coatings: UV clear coats on ABS, PC, PMMA and PP substrates for home appliance housings, outdoor plastic parts and fitness equipment coatings, preventing photo-ageing cracking of substrates. 3. Optical functional films and thin-film UV coatings: PET protective films, decorative films, dimming films and display optical films. Its low-migration property avoids haze rise and interface contamination caused by bleeding, and preserves high light transmittance. 4. 3D printing photoresins: SLA/DLP resins and outdoor printed parts. Finished parts resist yellowing and embrittlement during long-term exposure, suitable for cultural & creative products, outdoor structural components and tooling models. 5. UV inks and jet-printing inks: Outdoor UV inkjet inks and surface-printing inks for plastics, improving colour retention and retarding chalking and delamination of ink layers. 6. UV adhesives and electronic encapsulation UV resins: Optical adhesives, laminating adhesives and protective coatings for electronic components, avoiding contamination of chips and optical lenses from small-molecule exudation. 7. Surface weathering modification for photoresists and UV-curable composites, as well as special UV-curable systems requiring low bleeding and low migration. Formulation Precautions BP-1A contains a benzophenone chromophore. Excessive addition will deepen the base colour, so the dosage cap must be controlled for high-transparency formulations. As a reactive monomer, it shall be stored away from light, in cool and dry conditions and isolated from air to prevent premature self-polymerization. It is not suitable for direct use in cationic curing systems (epoxy cationic UV) and is preferentially applied to free-radical UV curing systems. Food-contact applications require prior migration testing complying with relevant regulations. As downstream end-users continuously raise requirements for material durability, safety and low bleeding, formulations relying solely on physically blended small-molecule photostabilizers can hardly satisfy high-end markets. Reactive photostabilizing monomers represented by CAS 15419-94-0 (BP-1A) stand for the development trend of UV-curable weathering additives: anchoring stabilizing groups into polymer backbones via chemical bonds to achieve long-lasting, non-migratory and combinable UV protection. It facilitates the upgrading of UV coatings, inks and resins toward high weather resistance, high reliability and low exudation. Mass production is available domestically. We can provide samples, technical formulation support and ageing benchmark testing services to help customers rapidly develop new outdoor long-durable UV-curable products.