Process for producing a silicone polymer
US6054548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1999 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Aug 26, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/32
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing a silicone polymer having a volatile material content of less than 1% by weight, preferably less than 0.1% by weight, comprises the sequential steps of (i) producing an unstripped silicone polymer by polymerisation of a linear silanol group containing siloxane by condensation polymerisation, or of a cyclosiloxane by ring-opening polymerisation, or of a mixture of said linear and cyclosiloxanes, with a phosphazene base in the presence of water and the presence or absence of a filler, (ii) neutralising the catalyst, and (iii) stripping the unstripped silicone polymer, preferably at temperatures of 200.degree. C. and above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.