Silalactones and methods for their preparation and use

Details Silalactones and methods for their preparation and use Silalactones and methods for their preparation and use

1983-12-23

1988-11-29

Shaver, Paul F.

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

Organic compounds

Silicon containing

C07F 708, C07F 718

Patent

active

047883138

ABSTRACT:
Carboxyalkyl-substituted organopolysiloxanes are prepared by hydrolysis of a silalactone composition having the formula ##STR1## where n has an average value greater than zero, R and Q are hydrocarbon and X is Cl or Br. Silicon-containing compounds having the formula R.sub.a Z.sub.b SiO.sub.(4-a-b)/2, where Z is a hydrolyzable radical, can be cohydrolyzed therewith. The novel silalactone composition is prepared by gently heating a mixture of an ester having the formula X.sub.2 R SiQCO.sub.2 R' and a halide salt catalyst, such as tetrabutylammonium bromide.

REFERENCES:
patent: 2449987 (1948-09-01), Gresham
patent: 2589446 (1950-04-01), Sommer
patent: 2635109 (1951-10-01), Sommer
patent: 2963500 (1960-12-01), Sommer
patent: 3395167 (1968-07-01), Saam
patent: 4392483 (1982-05-01), Speier

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