Method for the preparation of (meth)acryloxyalkyl group-containi

Details Method for the preparation of (meth)acryloxyalkyl group-containi Method for the preparation of (meth)acryloxyalkyl group-containi

1995-05-26

1996-04-02

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

C07F 708

Patent

active

055042341

ABSTRACT:
A novel method is disclosed for the preparation of a (meth)acryloxyalkyl group-containing organopolysiloxane having a linear structure by the ring-opening siloxane rearrangement polymerization reaction of a (meth)acryloxyalkyl group-containing cyclic organopolysiloxane oligomer either alone or in combination with a cyclic organopolysiloxane oligomer having no (meth)acryloxyalkyl groups. Different from conventional acidic catalyst, the reaction can be promoted by the use of a cation-exchange resin in the H.sup.+ form which can be readily removed from the polymerization mixture after completion of the polymerization reaction leaving no acidic matter which influences on the stability of the product. The catalytic efficiency of the cation-exchange resin can be further enhanced when the resin is, prior to contacting with the cyclic organopolysiloxane oligomer(s), impregnated or swollen with a polar organic solvent such as tetrahydrofuran.

REFERENCES:
patent: 2875177 (1959-02-01), Bluestein
patent: 3464955 (1969-09-01), Bluestein
patent: 4652662 (1987-03-01), von Au et al.
patent: 5239085 (1993-08-01), Enami et al.
patent: 5332796 (1994-07-01), Yoshikawa et al.

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