Unsaturated polysiloxanes and polymers thereof
US4605712A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1984 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Sep 24, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/54
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polysiloxanes of uniform molecular weight (MW) distribution with 500-10,000 MW segments of polysiloxane and containing at least one vinyl group connected to said polysiloxane segments through intervening alkylene-urea or -urethane linkages are prepared from polysiloxane-polyols, -polyamines or -polythiols by reaction with an unsaturated compound containing an isocyanato moiety, for example 2-isocyanatoethyl methacrylate. The polysiloxanes containing the vinyl groups are useful as radiation- or thermally curable coatings for glass, textiles, plastics, wood, ceramics, metals, as films or bandages for medicinal purposes, or molded shapes, in form of contact lenses, catheters or implants, either by themselves or in combination with other vinyl monomers; and are particularly useful in preparing hard or soft contact lenses, including hydrogel contact lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.