Polymeric compositions and methods of using them
US4670501A · kind A · utility
130Cited by
8References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 1985 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | May 16, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/923
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Water-immiscible liquids, for example oil-based drilling fluids, are thickened by the addition of an aqueous dispersion of polymeric particles that are water-insoluble, and insoluble but swellable polymer, in the water immiscible liquid. The particles have a unswollen average diameter of less than 10 .mu.m and at least 30% by weight are preferably in the range 0.5 to 5 .mu.m. Preferred polymers are formed from more than 80% by weight hydrophobic monomers, preferably alkyl (meth) acrylates, and up to 20% hydrophilic monomers, preferably unsaturated carboxylic acids, preferably acrylic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.