Acid-functional polymers derived from cellulose ester-unsaturated alcohol copolymers, which are reacted with cyclic anhydrides
US4859758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1987 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Nov 16, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F251/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Novel carboxylic acid-functional polymers are obtained by reacting: PA1 (a) a hydroxy-functional polymer having an average of at least two hydroxyl groups per molecule; and PA1 (b) a cyclic anhydride under reaction conditions to produce acid groups and ester groups; and PA1 wherein the hydroxy-functional polymer is obtained by the copolymerization of: PA2 (i) 1-95 weight percent of a cellulose ester; and PA2 (ii) 5-99 weight percent of at least one ethylenically unsaturated alcohol copolymerizable with the cellulose acetate butyrate; and PA2 (iii) 0-94 weight percent of at least one other ethylenically unsaturated monomer copolymerizable with the cellulose ester and the ethylenically unsaturated alcohol. Curable compositions especially useful as coatings are prepared by mixing the novel carboxylic acid-functional polymers with epoxy-functional compounds and, optionally, with anhydride-functional compounds and, optionally, hydroxy-functional compounds. The coatings are especially useful in clearcoat/basecoat compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.