Heat curable organopolysiloxane compositions

Details Heat curable organopolysiloxane compositions Heat curable organopolysiloxane compositions

1980-09-23

1982-07-13

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 24, 528 31, 528 32, 528 43, C08G 7706

Patent

active

043395643

ABSTRACT:
The invention provides a novel heat curable organopolysiloxane composition capable of giving a cured product having a remarkably high hardness and excellent anti-crack resistance. The cured product is also free from surface tackiness even by heat-curing in air. The main component of the composition is an organopolysiloxane having vinyl groups, phenyl groups and silicon-bonded hydrogen atoms simultaneously in a molecule or a mixture thereof with a second organopolysiloxane having vinyl groups and phenyl groups but no silicon-bonded hydrogen atoms in the molecule. It is essential that the molar ratios of the vinyl groups, phenyl groups, silicon-bonded hydrogen atoms and, if any, alkyl groups in the organopolysiloxane or organopolysiloxanes to the silicon atoms must be within specifically defined ranges and the organopolysiloxane component is admixed with a platinum catalyst for the addition reaction between the vinyl groups and the silicon-bonded hydrogen atoms as well as an organic peroxide such as dicumyl peroxide.

REFERENCES:
patent: 3159601 (1964-12-01), Ashby
patent: 3159662 (1964-12-01), Ashby
patent: 3220972 (1965-11-01), Lamoreaux
patent: 4234713 (1980-11-01), Le Grow

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