Non-agglomerating elastomeric organopolysiloxane particulates produced by polycondensation crosslinking
US5064894A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1990 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Jan 19, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2383/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Non-agglomerating elastomeric organopolysiloxane particulates having a mean particle size ranging from 50 .mu.m to 3 mm, uniformly coated with silica powder on the face surfaces thereof and well adapted as a soft filler material for natural or synthetic polymers or as a controlled release dosage form, are produced by (a) forming an oil-in-water emulsion of .alpha.,.omega.-dihydroxydiorganopolysiloxane oils, silica powder, a platinum curing catalyst and, optionally, an active principle such as a medicament or an agrochemical, and then (b) breaking and polycondensation crosslinking such emulsion into the desired particles by heating it to a temperature ranging from 40.degree. to 100.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.