Automotive coatings face sustained exposure to UV radiation, which can lead to degradation of both aesthetic and protective properties. Field measurements show that vehicles in high-sun environments experience up to 2,500 hours of direct UV exposure annually, with surface temperatures reaching 80°C. This combination of UV radiation and heat accelerates polymer breakdown, causing color fading, loss of gloss, and structural deterioration of the coating system.

The fundamental challenge lies in developing coating systems that maintain both their protective function and aesthetic qualities while withstanding prolonged UV exposure without compromising the coating's mechanical properties or manufacturing compatibility.

This page brings together solutions from recent research—including hindered amine light stabilizers with potassium carbonate integration, composite UV absorbers with dispersing agents, and novel diatom-based fillers combined with HDI trimers. These and other approaches focus on achieving long-term UV stability while maintaining coating performance in real-world automotive applications.

1. UV Absorber Composition with Integrated Dispersing Agents, Stabilizers, and Antioxidants for Enhanced UV Stability

XINIER NEW MATERIAL TECHNOLOGY CO LTD, 2025

Environmentally friendly UV absorber for coatings that maintains high UV resistance through enhanced antioxidant properties. The absorber combines a UV absorber with a synergistic combination of dispersing agents, stabilizers, and antioxidants. The UV absorber maintains its UV absorption characteristics over the 300-400nm range, ensuring effective UV protection while minimizing degradation. The combination provides superior UV stability compared to traditional UV absorbers, making it suitable for coatings requiring long-term UV protection.

CN119350910A-patent-drawing

2. Composite Light Stabilizer Formulation with Hindered Amine and Potassium Carbonate for Vehicle Paint

Suqian Zhenxing Chemical Co., Ltd., SUQIAN ZHENXING CHEMICAL CO LTD, 2024

A synergistic composite light stabilizer for vehicle paint that combines hindered amine light stabilizers with additional components to achieve enhanced anti-aging properties while maintaining compatibility with the paint system. The stabilizer formulation comprises a light stabilizer, antioxidants, and other additives in specific weight ratios, with potassium carbonate as a key component. The reaction is carried out under nitrogen protection at elevated temperatures to produce a stabilized light stabilizer.

3. Coating Composition with Transition Metal Oxide and OH-Containing Hindered Amine Light Stabilizer

JGC CATALYSTS CO LTD, 2023

A weather-resistant coating composition comprising titanium oxide and a hindered amine light stabilizer (HALS) where the titanium oxide is replaced by a transition metal element other than tetravalent. The composition contains the HALS with molecular structures containing OH and 3 or more N atoms. The composition is suitable for applications requiring enhanced weather resistance, particularly in environments exposed to UV radiation.

JP2023111520A-patent-drawing

4. Anti-Aging Additive for Coatings Comprising Hindered Phenol, Silane Coupling Agent, and Acrylic Amino Resin

Narinway Nanotechnology Co., Ltd., NALINV NANO TECHNOLOGY CO LTD, 2023

Modified anti-aging additive for coatings that prevents color degradation and photo-aging while maintaining optical clarity. The additive comprises a combination of a hindered phenol antioxidant, a silane coupling agent, and a specific acrylic amino resin. The modified additive exhibits improved light stability and color retention compared to conventional anti-aging agents, enabling its use in high-transmittance coatings that maintain their optical properties over extended periods of exposure to sunlight.

5. Automotive Coating with Silver Mica Pearl, Talcum, and Diatom-Based Filler Incorporating Hydroxy-Acrylic Resin and HDI Trimer

NINGBO SIODONG LITER COATING SYSTEM LTD CO, 2022

Anti-UV car paint and preparation method that enhances automotive paint durability through a novel combination of silver mica pearl, talcum powder, and diatom-based filler. The method involves mixing hydroxy-acrylic resin with diatom-based latex, followed by addition of a dihydroxydiacetone (HDI) trimer. The latex is then heated to form a milky white or translucent film that incorporates the diatom-based filler. The diatom-based filler provides UV protection, while the HDI trimer stabilizes the film through its nitroxide radical mechanism. This combination enables enhanced UV resistance, improved chemical stability, and enhanced mechanical strength in automotive coatings.

6. Automotive Overcoat Varnish with Modified Hydroxy Acrylic and Fluorocarbon Resins and Silicon Coupling Agent

HAOLISEN COATINGS CO LTD, 2022

High-weather-resistant automotive overcoat varnish and its preparation method. The varnish comprises Component A and Component B. Component A comprises a high-solid, low-viscosity modified hydroxy acrylic resin (10-15%), high hydroxyl acrylic resin (35-45%), and high hydroxyl fluorocarbon resin (15-25%). Component B comprises a multifunctional silicon coupling agent. The varnish exhibits improved weather resistance, excellent gloss retention, and rapid drying properties.

7. Paint Composition with Aqueous Emulsion Binder and Sterically Hindered Amine Light Stabilizer

LL M SANGTEAK, 임상택, 2021

Paint and paint adjuvant compositions with enhanced light stability. The compositions contain a binder resin in an aqueous emulsion, a liquid light stabilizer, a dispersant, a pigment, and an inorganic filler, with the light stabilizer being a sterically hindered amine-based compound. The compositions provide superior light resistance while maintaining transparency and gloss properties.

KR102312974B1-patent-drawing

8. UV-Resistant Car Paint with UV-Stabilizing Polymer and Nano-Alumina in Water-Based Dispersion

HEBEI CHENYANG INDUSTRY AND TRADE GROUP CO LTD, 2020

UV-resistant car paint that maintains gloss and color resistance under sunlight while preventing degradation of additives. The paint combines a UV-stabilizing polymer with antibacterial agents, water-based dispersion, and nano-alumina for enhanced durability. The formulation is prepared through a multi-step process involving deionized water, propylene glycol, UV stabilizers, and polyacrylic acid dispersion. The paint maintains its gloss retention rate at 50% per hour under UV radiation exposure, while maintaining antibacterial properties and preventing environmental toxicity.

9. Modified Acrylic Automotive Paint with UV-Resistant Additive and Preparation Equipment

QINGYUAN WINNING MATERIAL TECHNOLOGY CO LTD, 2020

Anti-color change modified acrylic automotive paint, preparation method, and equipment that enhances the durability and color stability of automotive coatings. The paint combines a modified acrylic resin with a specific additive that prevents color change under UV radiation and environmental exposure. This additive maintains the paint's original color and gloss while providing enhanced UV resistance. The formulation enables long-lasting color retention and gloss improvement in automotive coatings, particularly for base materials used in topcoat applications.

CN110951343A-patent-drawing

10. Reactive UV Absorber with Isocyanate-Reactive Group for Polymer Chain Integration

RISE CHEMICAL RESEARCH CO LTD, 2020

A reactive UV absorber that enhances weather resistance without bleed-out or outflow. The absorber contains a specific reactive group that reacts with isocyanate monomers, enabling uniform incorporation into polymers. The reactive group enables controlled incorporation into polymer chains, ensuring consistent performance across the polymer matrix. This approach eliminates the traditional issues of UV bleed and outflow associated with conventional UV absorbers.

11. Benzene Derivative UV Absorber with Glycidoxy and Hydroxy Groups for Enhanced Polymer Integration

JIANGMEN HANDSOME CHEMICAL DEVELOPMENT CO LTD, Jiangmen Qianxin Chemical Development Co., Ltd., 2019

Active UV absorber that provides long-lasting protection against UV degradation of organic materials. The absorber, comprising a benzene derivative with a glycidoxy group and a hydroxy group, exhibits superior chemical stability and resistance to migration in organic formulations. The absorber's unique molecular structure enables it to form strong covalent bonds with the polymer matrix, preventing leaching and maintaining its protective properties over extended periods.

CN107383980B-patent-drawing

12. Coatings with Covalently Bound Triazine UV Absorbers on Transparent Resin Surfaces

BASF SE, 2018

Coatings with selectively bound triazine UV absorbers that enhance UV stability in multicoat automotive paint systems. The coatings incorporate a triazine UV absorber covalently attached to the surface of a transparent resin, which is then applied to the substrate. This selective binding prevents UV absorption by the triazine while maintaining the transparency of the resin. The triazine absorbs UV radiation, thereby protecting the resin and the underlying substrate.

13. Color Paste Composition with Surfactant and Ultraviolet Absorber Integration for Enhanced Stability

SHANGHAI JINSHI CHEMICAL CO LTD, 2018

A color paste for coatings that enhances light stability and durability through a novel combination of surfactants and ultraviolet absorbers. The paste comprises a pigment dispersion, surfactant, light stabilizer, pH adjuster, fungicide, and defoamer, all combined in a specific ratio. The surfactant and light stabilizer work together to absorb and neutralize ultraviolet radiation, while the pH adjuster maintains optimal pH conditions for the pigment dispersion. The combination provides superior light resistance, stability, and compatibility compared to traditional color pastes.

CN107903716A-patent-drawing

14. Paint Formulation with UV-Absorbing Silica and Stabilizing Pigment

CHENGDU KAISIEN TECH CO LTD, 2018

A UV-resistant paint formulation that provides long-lasting protection against ultraviolet radiation degradation. The formulation incorporates a unique combination of UV-absorbing additives, including a specific type of silica and a UV-stabilizing pigment, to prevent paint film degradation caused by UV exposure. The additives work synergistically to absorb UV radiation and prevent its transmission through the paint film, thereby preventing degradation of the paint's physical and chemical properties over time.

CN107793923A-patent-drawing

15. Benzotriazole Compounds with Enhanced Compatibility for UV Absorption and Light Stabilization in Coating Formulations

BASF SE, 2016

Benzotriazole compounds as UV absorbers and light stabilizers for coatings, particularly for paints and coatings. The compounds absorb UV light, reducing its intensity in the coating. They exhibit excellent compatibility with coating formulations of different polarities and provide superior light stability compared to conventional UV stabilizers. The compounds can be used in coatings as a UV absorber and light stabilizer, particularly for paints and coatings.

JP2016538382A-patent-drawing

16. Clear Coating Composition with Nanoscale Titanium Oxide and UV Stabilizers

TOYOTA MOTOR EAST JAPAN INC, 2016

A clear coating composition for automotive bodies that enhances weather resistance while maintaining high visible light transmission. The composition contains a binder, an organic UV absorber, a hindered amine-based light stabilizer, and fine particle titanium oxide. The titanium oxide particles have an average diameter of 10-50 nm and a particle weight content (PWC) of 0.025-0.050 parts by mass. The composition achieves superior weather resistance while maintaining transparency compared to conventional UV stabilizers. The composition can be used in multi-layer coatings for automotive bodies, where the clear coating film provides excellent weather resistance while the base coating enables precise control over the multi-layer structure.

JP2016188332A-patent-drawing

17. UV Absorber with Controlled Reaction Integration into Polymer Matrix

XU WEI-PENG, 2016

A UV absorber for polymer materials that enhances their UV stability through a novel preparation method. The absorber combines high absorption efficiency with improved environmental safety compared to conventional UV absorbers. The preparation method involves a controlled reaction between a UV-absorbing compound and a polymer matrix, resulting in a stable and non-corrosive UV absorber that effectively protects polymer materials from UV degradation.

CN105838129A-patent-drawing

18. UV-Resistant Paint with Eco-Friendly Additives and Water-Based Composition

QU SHAOCHUN, 2016

Environmental-friendly UV paint and preparation method for exterior coatings that addresses the limitations of conventional UV stabilizers. The paint combines non-toxic, long-lasting UV protection with excellent water resistance and durability. The coating system replaces conventional UV stabilizers with a novel combination of environmentally friendly additives that maintain UV protection properties over extended periods. This approach enables the development of water-based exterior coatings that provide superior UV protection while minimizing environmental impact.

CN105505156A-patent-drawing

19. UV Stabilizer Coating Composition with Fatty Acid Ethylene Oxide Adduct and Polyoxyethylene-Polyoxypropylene Block Copolymer

QU SHAO-CHUN, 2016

A UV stabilizer coating composition for polymers, comprising a UV absorber system comprising a combination of a fatty acid ethylene oxide adduct and a polyoxyethylene-polyoxypropylene block copolymer, along with a curing system comprising a bis-benzylamine-phenylenediamine crosslinker and a polyol polyoxyethylene ether carboxylate. The composition is prepared by a multi-step process involving separate thermal treatment of the UV absorber components, followed by sequential addition and degassing of the crosslinker and polyol components. The composition exhibits high UV absorption performance and thermal stability.

CN105440769A-patent-drawing

20. Water-Soluble Varnish Composition with Polymer-Resin Matrix and Additives for Automotive Coatings

CHANGCHUN SANHUA INDUSTRIAL CO LTD, Changchun Sanhua Industrial Co., Ltd., 2016

Water-soluble varnish for automotive coatings that provides excellent weather resistance and meets environmental standards, replacing traditional organic solvents in automotive paint formulations. The varnish comprises a combination of polymers, resins, and additives, including water-soluble polymers, resins, and wetting agents, that deliver superior performance in terms of gloss retention and UV stability. The formulation also incorporates a UV stabilizer, fungicide, and coalescent agent to enhance durability and prevent degradation.

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