Bridged silicone oligomers and curable compositions containing same
US6323277A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1999 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Mar 11, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/442
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Oligomers of the formula: EQU [R.sub.3 SiO.sub.1/2 ].sub.m [O.sub.1/2 Si(R.sub.2)O.sub.1/2 ].sub.n [SiO.sub.3/2 R].sub.o [SiO.sub.4/2 ].sub.p (I) wherein PA1 each R is selected individually from the group consisting of B, R.sup.1,--OR.sup.2, R.sup.3 and R.sup.4 ; B is an organosilyl functional group bridged to the Si atom of the siloxane oligomer backbone by an Si--C bond; each R.sup.1 is independently a saturated or aromatic hydrocarbon group of 1 to 16 carbon atoms; each R.sup.2 is independently a group as defined for R.sup.1 or an acyl group; and each R.sup.3 is independently a monovalent organic radical containing an aliphatically unsaturated hydrocarbon group and each R.sup.4 is a monovalent organic radical linked to the Si atom of the siloxane oligomer backbone by an Si--C bond, which does not include an aliphatically unsaturated hydrocarbon group and which has thereon one or more members of the group selected from ether, polyether, ester, polyester, carbamate, polyurethane, isocyanurate, thioether, polysulfide, blocked mercaptan, amide, cyano and oximato groups; with the provisos that at least one R is a B, at least one quarter of all R groups are --OR.sup.2, and at least on…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.