Rubber-modified rigid silicone resins and composites produced th

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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525478, 528 15, 528 17, 528 18, 528 19, 528 21, 528 34, 528 24, C08F28300

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active

060462833

ABSTRACT:
Novel rubber-modified rigid silicone resins are disclosed. The novel resins are the copolymerized reaction product of (A) an organosilicon composition selected from the group consisting (I) an organosilicone resin, (II) hydrolyzable precursors of (I), and an hydrolyzate of (II), (B1) a first silicone rubber having a nonfunctional linear chain length between functional groups from 6 to 100 and (B2) a second silicone ruberr having terminal functional groups and a degree of polymerization from about 200 to 1,000. The novel rubber-modified rigid silicone resins of the invention show remarkably high fracture toughness, K.sub.Ic, and critical strain energy release rate G.sub.Ic.

REFERENCES:
patent: 5034061 (1991-07-01), Maguire et al.
patent: 5268433 (1993-12-01), Ikeno et al.
patent: 5747608 (1998-05-01), Katsoulis et al.
patent: 5830950 (1998-11-01), Katsoulis et al.
Effects of Rubber Additions On The Fracture Toughness of A Polyester Resin; Tetlow et al.; 34th Annual Technical Conference, 1979; Section 23-F, p. 1-4.
Crack Toughened Polyester Resin Formulations; McGarry et al.; American Chemical Society Division of Organic Coating and Plastics Chemistry; vol. 28, No. 1; pp. 526-536.

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