Process for producing diorganopolysiloxane

Details Process for producing diorganopolysiloxane Process for producing diorganopolysiloxane

1996-06-21

1997-09-30

Dean, Ralph H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 26, 528 37, C08G 7706

Patent

active

056726716

ABSTRACT:
A process is disclosed for producing a diorganopolysiloxane by polymerizing a cyclic siloxane expressed by the following general formula (2) ##STR1## wherein R.sup.3 represents methyl group, ethyl group, or phenyl group, and p is an integer of 3 or 4,
by an anion living polymerization using a lithium trialkylsilonolate or an alkyl lithium as a polymerization initiator and then terminating the anion living polymerization with an acid or a chlorosilane derivative, the improvement comprising treating a diorganopolysiloxane which is modified with a silanol at both its terminals and included in the cyclic siloxane as impurities, with an acetylating agent.

REFERENCES:
patent: 4625011 (1986-11-01), Kosal et al.
patent: 5272225 (1993-12-01), Ogawa et al.

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