Polysiloxane-polyether block copolymer and method for the prerar

Details Polysiloxane-polyether block copolymer and method for the prerar Polysiloxane-polyether block copolymer and method for the prerar

1997-03-31

1998-06-16

Glass, Margaret W.

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

Synthetic resins

From silicon reactant having at least one...

528 31, 528 43, 528 15, 556445, C08G 7708

Patent

active

057672199

ABSTRACT:
Proposed is a novel polysiloxane-polyether block copolymer having excellent heat resistance, which is characterized by the molecular structure consisting of repetition of diorganopolysiloxane units and polyoxyalkylene units having a bisphenol linkage of the formula --O--Pn--CMe.sub.2 --Pn--O-- in the unit, Pn being a 1,4-phenylene group and Me is a methyl group. This polysiloxane-polyether block copolymer can be prepared by conducting a hydrosilation reaction between a diorganopolysiloxane terminated at each molecular chain end with a silicon-bonded hydrogen atom and a polyoxyalkylene compound having the bisphenol linkage in the molecule and terminated at each molecular chain end with an alkenyl group or, preferably, allyl group in the presence of a platinum catalyst. The stability of the block copolymer obtained by the hydrosilation reaction can be further improved, when the block copolymer has a silicon-bonded hydrogen atom as the terminal group, by reacting the silicon-bonded hydrogen atom with water or alcohol to be converted into a silanolic hydroxy group or alkoxy group.

REFERENCES:
patent: 3176034 (1965-03-01), Clark
patent: 3957842 (1976-05-01), Prokai et al.
patent: 5032662 (1991-07-01), Berger et al.
patent: 5542960 (1996-08-01), Grabowski

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