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US 2003/0194561 A1Published application
Scratch-resistant coating
AssigneeBayer Aktiengesellschaft
InventorsPeter Bier, Peter Capellen, Renate Weller
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AssigneeBayer Aktiengesellschaft
InventorsPeter Bier, Peter Capellen, Renate Weller
Estimating the term…
The present invention provides a coating which contains a primer layer on a substrate with a scratch resistant layer adhered to the primer, wherein the primer layer contains a hardened epoxy resin prepared from a hardener and a multi epoxy-functional compound and the scratch resistant layer contains an epoxide group containing hydrolyzable silane. The coating may find use in coated products such as sheets, spectacles, optical lenses, automobile screens and plastic spray screens.
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Use of compositions containing hardeners and multi-epoxy functional compounds to produce primer coats (P) in coatings comprising these primer coats (P) and a scratch-resistant coat (S) adhering to the primer coat (P), whereby the scratch-resistant coat (S) is obtainable from hydrolysable silanes containing epoxy groups.
Coating comprising a primer coat (P) adhering to the substrate to be coated and a scratch-resistant coat (S) adhering to the primer coat (P), characterised in that the primer coat (P) contains a cured epoxy resin obtainable from hardeners and multi-epoxy functional compounds and that the scratch-resistant coat (S) is obtainable from hydrolysable silanes containing epoxy groups.
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced ; Filling pastes: priming…
Coating: with only one layer of a composition containing a polymer binder
Coating: improving the adhesiveness of the coatings per se, e.g. forming primers
Coating: forming abrasion-resistant coatings; Forming surface-hardening coatings
Term end not estimated
The present invention concerns scratch-resistant coatings comprising a primer coat (P) adhering to a substrate to be coated and a scratch-resistant coat (S) adhering to the primer coat (P), whereby the primer coat (P) contains a cured epoxy resin obtainable from hardeners and multi-epoxy functional compounds, and whereby the scratch-resistant coat (S) is obtainable from hydrolysable silanes containing epoxy groups. The coatings according to the invention are particularly resistant to attack by water. The present invention further concerns products coated with these coatings.
In order to protect materials against damaging environmental influences, they are frequently provided with a coating. Siloxane-based coatings, also known as siloxane coats, that give the materials inter alia a scratch-resistant and chemical-resistant surface, have proven to be particularly suitable. Siloxane coats are therefore also known as scratch-resistant coats (S).
In order to ensure a good adhesion of the particularly hard scratch-resistant coat (S) to the generally softer substrates, an intermediate coat, also known as a primer coat (P) is frequently used between the substrate and the scratch-resistant coat (S). The purpose of this primer coat (P) is to compensate for the different expansion coefficients of the substrate and the scratch-resistant coat (S) and to bring about a good adhesion of the coats to the substrate.
The following examples illustrate the present invention.
Scratch-Resistant Paints for Production of the Scratch-Resistant Coat (S):
Scratch-Resistant Paint S1