Aqueous dispersions based on viscous silicone oils capable of cross-linking on removal of water
US5851594A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1997 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Mar 21, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2383/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Aqueous dispersions containing: a silicone oil (A) which is cross-linkable by condensation, optionally in the presence of a cross-linking agent (B), into an elastomer; optionally a cross-linking agent (B), a silane (C) and a mineral filler (D); and a catalytic amount of a hardening compound (E). Said dispersions are characterized in that they are produced by kneading a mixture of (1) a silicone phase (F) with a viscosity of at least 3 Pas, containing the oil (A) and optionally one or more of components (B), (C), (D) or (E), and 2) an aqueous phase comprising water and at least one surfactant (G), wherein the weight ratio water/water+surfactant(s) is such that the viscosity of the aqueous phase is preferably at least as high as that of the silicone phase (F); for a sufficient time and with sufficient shear to give an oil-in-water emulsion having a particle size of 0.1-5 micrometers; and optionally by diluting with water until a 25-97 % dry extract is obtained; followed by adding the component(s) not present in the silicone phase (F).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.