Method for preparing organopolysiloxane bases and compositions t

Details Method for preparing organopolysiloxane bases and compositions t Method for preparing organopolysiloxane bases and compositions t

1996-11-13

1998-07-07

Dean, Karen A.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523209, 523210, 10628714, 10628715, 106431, 524731, 524847, 524860, C08K 906

Patent

active

057770026

ABSTRACT:
A method for preparing organopolysiloxane bases with high levels of fillers. The present inventors have found that by mixing the components of the base at a temperature below about 60.degree. C. for a period of time sufficient to effect essentially a homogeneous blend, a base composition is formed which can be further blended with a platinum group metal-containing catalyst, an organohydrogensiloxane, and optionally an inhibitor to form a curable liquid silicone rubber (LSR) composition. The curable LSR composition has improved flow characteristics and improved shelf life when compared to similar materials where the base is prepared at temperatures above about 60.degree. C. The improved flow characteristics allows larger quantities of fillers to be incorporated into the curable LSR composition while still maintaining acceptable flow characteristics. Silicone elastomers prepared using the curable LSR compositions can have improved swell and degradation resistance to oils, lower compression set values, and improved tear, elongation, and tensile values and require no post cure. The present organopolysiloxane bases are particularly useful as a common base for forming a group of cured silicone elastomers with a range of durometers.

REFERENCES:
patent: 4013611 (1977-03-01), Hechtl et al.
patent: 4116919 (1978-09-01), Elias et al.
patent: 4360610 (1982-11-01), Murray et al.

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