Copolymers containing isocyanate and acid anhydride groups, a process for their preparation and their use as a binder components

US4990583A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christian Wamprecht · Neuss, DE
• Josef Pedain · Cologne, DE
• Harald Blum · Wachtendonk, DE

Key dates

• Filing date: Feb 3, 1989
• Grant date: Feb 5, 1991
• Expiry date: Feb 3, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D133/064
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Copolymers useful in binders for two-component coating compounds or sealing compounds are copolymers having a weight average molecular weight, determined by the gel permeation chromatography method, of from 1500 to 75,000 of olefinically unsaturated compounds containing chemically incorporated moieties capable of undergoing an addition reaction with hydroxyls wherein the copolymers contain, as hydroxyl reactive groups, both PA1 (i) from 0.3 to 7.0% by weight of free isocyanate groups and PA1 (ii) from 1 to 25% by weight of acid anhydride groups, calculated as C.sub.4 H.sub.2 O.sub.3, in a chemically bound form.