Composition for Coating Substrate Surfaces

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This invention discloses a novel composition for coating substrate surfaces, especially designed to provide anti-adhesive (anti-stick) and easy-clean (anti-graffiti) properties. The system is based on a hybrid material made from chitosan (a natural biopolymer), specific acids (such as acetic acid), and organosilanes, including methyltriethoxysilane and (3-glycidyloxypropyl)trialkoxysilane. The coating mixture hardens at room temperature, forms transparent, flexible, and durable layers, and does not contain fluorinated compounds or rigid structures that could cause cracks. The composition can be applied to a wide variety of materials to effectively prevent or facilitate the removal of graffiti, dirt, adhesives, and other contaminants.

Use CasesContent extracted from patent full text and abstract with AI.

• Protective coating for buildings, heritage monuments, and infrastructure to provide anti-graffiti surfaces.
• Application on trains, buses, public furniture, and stations to ease graffiti removal and reduce cleaning costs.
• Coating for packaging materials, such as paper, to impart water-repellent and easy-clean properties.
• Protection of textiles (e.g., linen, cotton, silk) to make them water-resistant without affecting flexibility.
• Coating metal, glass, ceramics, plastics, wood, and stone surfaces (indoors and outdoors) to improve durability and cleanliness.
• Use in electronics or medical devices where biocompatible, stable, and easy-to-clean coatings are needed.

BenefitsContent extracted from patent full text and abstract with AI.

• Highly effective anti-adhesive and anti-graffiti properties enable simple and environmentally friendly cleaning.
• The coating is transparent and does not alter the appearance of the underlying material.
• Forms strong, flexible layers that resist cracking and mechanical damage due to absence of rigid Q-groups.
• Environmentally friendly and biocompatible – made from chitosan, and is fluorine-free, avoiding hazardous PFAS chemicals.
• Thermally stable up to 250°C, and resistant to acids and bases, making it suitable for harsh environments.
• Compatible with a wide range of materials (metal, stone, textiles, plastics, etc.), expanding its applications.
• Room-temperature application and hardening simplifies industrial or on-site use, without the need for high-energy curing.
• Long shelf life and ease of mixing/application, including possible use as a three-component system for further convenience.
• Can be combined with pigments or functional fillers to impart additional properties (color, electrical conductivity, etc.).

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

The invention relates to a composition, produced by reacting a first mixture with a second mixture, wherein (a) the first mixture is a mixture of at least the components (a1) a chitosan; and (a2) an aqueous solution of an acid, wherein the acid is a carboxylic acid, an inorganic acid or a mixture thereof; and (b) the second mixture is a mixture of at least the components (b1) of a compound of the general formula (I) wherein R1 is selected from the group consisting of a substituted or unsubstituted, branched or unbranched alkyl group with 1 to 20 carbon atoms, a substituted or unsubstituted, branched or unbranched alkenyl group with 2 to 20 carbon atoms, a substituted or unsubstituted aryl group and a substituted or unsubstituted alkyl aryl group; and R2, R3 and R4 independently of one another are each a branched or unbranched alkyl group with 1 to 6 carbon atoms; and (b2) a (3-glycidyloxypropyl)trialkoxysilane.