Coating compositions for coatings that are permeable to water vapor and a process for their preparation

US5252671A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Josef Pedain · Cologne, DE
• Klaus Noll · Cologne, DE
• Wilhelm Thoma · Leverkusen, DE
• Detlef-Ingo Schutze · Recklinghausen, DE

Key dates

• Filing date: May 21, 1992
• Grant date: Oct 12, 1993
• Expiry date: May 21, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S528/904
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to coating compositions containing PA0 (A) 70 to 98% by weight, based on the sum of components (A) and (B), of PA1 (a) isocyanate-free polymers of ethylenically unsaturated monomers and/or polyurethanes or blocked isocyanate prepolymers, and PA1 (b) optional organic solvents, PA0 wherein component (A) contains no significant quantities of groups capable of reacting with component (B) or starting materials thereof and has a viscosity (at 23.degree. C.) of 2000 to 100,000 mPa.s; PA0 (B) 2 to 30% by weight, based on the sum of components (A) and (B), of a polyaddition product prepared in and dispersed in component (A), wherein the polyaddition product is a polyurethane, polyurethane urea, polyurea, or mixture thereof, containing ionic groups and/or potentially ionic groups in a quantity corresponding to from 0.5 to 20 milliequivalents per 100 g of component (B) but containing substantially no free isocyanate, hydroxyl, or amino groups: and PA0 (C) optional cross-linking agents; in which component (B) is formed in situ in component (A).