Polymeric thickeners, processes for their preparation and uses thereof
US4138381A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1977 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Feb 28, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/932
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Polymeric thickeners are provided in preferred compositions which give both good flow and leveling properties as well as sag resistance to coating compositions such as aqueous paints. The thickeners as prepared comprise a polymer dissolved in a solvent at a concentration up to 50% by weight of the composition, the solvent being at least one glycol and containing during manufacture up to 50% by weight, based on the weight of glycol, of water and the polymer consists essentially of (a) about 10 to 98% by weight of at least one unsaturated carboxylic acid of 3 to 6 carbon atoms, (b) about 1 to 50% by weight of at least one alkyl acrylate or alkyl methacrylate wherein the alkyl group is from 1 to 30 carbon atoms, and (c) about 1 to 85% by weight of at least one ester of the formula ##STR1## wherein R and R.sub.2 are each hydrogen or methyl, PA1 X is a positive integer of 5 to 80, PA1 Y is an integer of 0 to 20, and PA1 R.sub.1 is alkyl of 1 to 20 carbon atoms or alkyl phenyl where the alkyl group is from 1 to 20 carbon atoms; The total adding up to 100%. Processes for preparing the thickeners involve conducting the polymerization in glycol such as ethylene glycol or propylene glycol wi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.