Method for the preparation of a low-impurity organopolysiloxane by the polymerization of an organopolysiloxane oligomer
US4563513A · kind A · utility
7Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 16, 1984 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Aug 16, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention provides a novel method for the neutralization of the residual alkali catalyst following alkali-catalyzed polymerization of an organopolysiloxane oligomer to produce a high-polymeric organopolysiloxane, according to which the organopolysiloxane after completion of the polymerization reaction is admixed with a trihydrocarbyl monohalosilane, e.g. trimethyl chlorosilane, and a hexahydrocarbyl disilazane, e.g. hexamethyl disilazane, in combination as the neutralizing agent so that the neutralization is very complete and still the product organopolysiloxane contains very little impurities of alkali and halogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.