UV Dual Cure multilayer coating with chrome appearance
Applicant: DSColor Belgium
Inventor: Daniel Schoels
Patent number: WO2025/061783
Publication date: 2025-03-27
The invention relates to a multilayer "UV DUAL CURE" coating with a chrome-like (mirror effect) appearance. It also concerns its use and the related plastic article, targeting the field of double-curing multilayer coatings for giving plastic parts a reflective, chrome-like finish.
The problem
Hexavalent chromium (Chromium VI), long used for its anti-corrosion and coloring properties, is now restricted due to its harmful effects. Its ban from 2024 has pushed industries to seek alternatives. Current substitutes—like polyurethane-based metallic paints—lack gloss, adhesion, and hardness, and rely on high-energy processes. Many fail to deliver the mirror-like chrome finish. Some offer an aluminum-like look but are also energy-intensive and unsustainable, making them unsuitable for mass production.
This challenge extends beyond automotive to sectors like aviation and consumer goods.
There is a clear need for a chrome-effect coating that is energy-efficient, easy to manufacture, and meets industry standards.
The Solution
The invention introduces a UV dual-cure multilayer coating with a chrome appearance, comprising:
- A plastic substrate with a primer made of multifunctional urethane acrylate oligomer resin (2–8 acrylate functionalities), cured via UV, LED, or electron beam, with strong adhesion per ISO 2609 (class 0 or 1).
- A secondary layer containing metal pigments and alkoxysilane compounds to produce the chrome effect.
- A finishing layer (varnish) of similar oligomer resin, also UV/LED/electron beam curable, protecting the chrome appearance.
This structure enables a durable, reflective coating on plastic while supporting efficient production.
Advantages
This coating eliminates hexavalent chromium while delivering a chrome-like, mirror finish. It ensures strong interlayer adhesion and durability. UV/LED curing enables energy-efficient processing, cutting costs and environmental impact.
The optimized thickness suits lightweight applications in industries like automotive, appliances, and cosmetics, where both look and performance matter.
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