Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1983-03-14
1984-12-04
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524493, 524588, 524847, 528 12, 528 21, 528 24, 528 26, 528 33, C08L 8304
Patent
active
044865678
ABSTRACT:
Hydroxyl-endblocked polydiorganosiloxane oligomer is polymerized through the use of a catalyst mixture of quaternary ammonium carboxylate and carboxylic acid. The method heats the mixture of oligomer and catalyst to a temperature in the range of from 90.degree. C. to 150.degree. C., removing water from the mixture, until the desired degree of condensation is achieved. When cooled, the product is a stable polydiorganosiloxane of increased molecular weight. The catalyst can be inactivated by heating and removing volatile byproducts. One embodiment of the method adds an acidic or neutral reinforcing filler to the mixture before polymerization to yield a storage stable silicone polymer-filler mixture which is useful in a manner similar to conventionally produced silicone polymer-filler mixtures.
REFERENCES:
patent: 2460805 (1949-02-01), Britton et al.
patent: 2906734 (1959-09-01), Clark
patent: 2986549 (1961-05-01), McLoughlin et al.
patent: 3024210 (1962-03-01), Weyer
patent: 3160601 (1964-12-01), Hyde
patent: 3208916 (1965-09-01), Kookootsedes
patent: 3294717 (1966-12-01), Krantz
patent: 3812081 (1974-05-01), Dennis et al.
patent: 3997496 (1976-12-01), Razzano
patent: 4242250 (1980-12-01), Gagnon et al.
patent: 4431771 (1984-02-01), Falender et al.
Bowman Sheryl A.
Falender James R.
Lipowitz Jonathan
Saam John C.
Dow Corning Corporation
Elliott Edward C.
Marquis Melvyn I.
LandOfFree
Method of polymerizing hydroxyl endblocked polydiorganosiloxane does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of polymerizing hydroxyl endblocked polydiorganosiloxane , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of polymerizing hydroxyl endblocked polydiorganosiloxane will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1583316