Dispersant polymers
US5430089A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1994 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Oct 26, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D7/45
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A hydroxy functional polymeric dispersant which is substantially free of acid groups, amine groups, and ethylenic unsaturation, the dispersant being especially adapted for dispersing pigments therein and being compatible with a variety of film-forming polymers, said dispersant being the free radical addition polymerization reaction product of a mixture of monomers consisting essentially of: PA1 (a) 15-30% by weight styrene; and PA1 (b) 15-30% by weight of at least one alkyl methacrylate monomer having 1 to 16 carbon atoms in the alkyl group; and PA1 (c) 20-60% by weight of at least one alkyl acrylate monomer having 1 to 16 carbon atoms in the alkyl group; and PA1 (d) 7-25% by weight of at least one hydroxy-functional ethylenically unsaturated monomer copolymerizable with monomers (a) (b) and (c); wherein said polymeric dispersant has a weight average molecular weight of 18,000 to 24,000, a number average molecular weight of 4,500 to 7,400, and a polydispersity of 2.9 to 4.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.