Method of increasing the molecular weight of hydroxyl endblocked

Details Method of increasing the molecular weight of hydroxyl endblocked Method of increasing the molecular weight of hydroxyl endblocked

1975-07-16

1977-04-26

Jacobs, Lewis T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 465G, C08G 7704

Patent

active

040200442

ABSTRACT:
The method of mixing a hydroxyl endblocked polydiorganosiloxane and a silane of the formula ##STR1## where R is alkyl of one to four carbon atoms or phenyl and allowing the mixture to react at room temperature provides a polydiorganosiloxane of increased molecular weight in a short time, such as a few minutes to several hours. The resulting polydiorganosiloxane product contains methylvinylsiloxane units which are functional and can be further reacted with silicon-bonded hydrogen atoms or organic peroxides to give new polymers or cured products such as rubbers.

REFERENCES:
patent: 3776934 (1973-12-01), Toporcer et al.

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