Process for the shatterproof coating of glass surfaces
AssigneeBayer Aktiengesellschaft
InventorsWolfhart Wieczorrek, Gerhard Mennicken
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Abstract
The invention relates to a new process for the shatterproof coating of glass surfaces by coating the surfaces with a coating composition based on a two-component system reacting fully to form a polyurethane, the glass surfaces to be coated being coated before application of the coating composition with a physically drying priming lacquer containing a silane adhesion promoter and a catalyst which accelerates hardening of the coating composition and, as binder, a polyurethane polyurea which has a linear molecular structure and which is soluble in lacquer solvents.
Claims13
A process for coating glass surfaces to render them shatterproof which comprises
- (a) applying a physically drying priming lacquer which comprises
- (i) a silane adhesion promoter,
- (ii) a polyurethane polyurea binder which has a linear molecular structure and which is soluble in lacquer solvents,
- (iii) at least one catalyst which accelerates the isocyanate-addition reaction, and
- (iv) at least one solvent,
- (b) drying the priming lacquer,
- (c) coating the dried priming lacquer with a solvent-free or substantially solvent-free coating composition containing a two-component polyurethane binder comprising an isocyanate-reactive component and an isocyanate-containing component, and
- (d) reacting the two-component polyurethane binder to harden the coating composition.
A process for coating glass surfaces to render them shatterproof which comprises
- (a) applying a physically drying priming lacquer which comprises based on the total weight of the priming lacquer
- (i) about 0.2 to 3% by weight of a silane adhesion promoter,
- (ii) about 5 to 25% by weight of a polyurethane polyurea binder which has a linear molecular structure, is soluble in lacquer solvents and is based on at least one aliphatic or cycloaliphatic diisocyanate, at least one polyester diol having a molecular weight of about 1000 to 2500 and at least one aliphatic or cycloaliphatic diprimary diamine,
- (iii) about 0.2 to 2% by weight of a catalyst which accelerates the isocyanate-addition reaction, and
- (iv) at least one solvent,
- (b) drying the priming lacquer,
- (c) coating the dried priming lacquer with a solvent-free or substantially solvent-free coating composition containing a two-component polyurethane binder comprising an isocyanate-reactive component containing a polyether polyol or polyester polyol and an isocyanante-containing component having aliphatically-bound and/or cycloaliphatically-bound isocyanate groups and which does not contain a catalyst for the isocyanate-addition reaction, and
- (d) reacting the two-component polyurethane binder to harden the coating composition.
Dependencies are inferred from the claim text.