Primer compositions

Details Primer compositions Primer compositions

1979-11-06

1981-09-01

Briggs, Sr., Wilbert J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

525477, 525479, 156329, C08L 8306, C08K 336

Patent

active

042871140

ABSTRACT:
The adhesive bonding of a silicone rubber to a metal surface can be very much improved by the use of the inventive primer composition, in particular, with respect to the heat resistance and anti-oil resistance of the adhesion. The inventive primer composition comprises (a) a substantially linear diorganopolysiloxane of gum-like consistency free from aliphatic unsaturation, (b) an organopolysiloxane with the organic group/silicon atom molar ratio of 1.9 to 2.3 and having a limited amount of vinyl groups directly bonded to the silicon atoms and a viscosity of 5 to 10,000 centistokes at 25.degree. C., (c) an organopolysiloxane resin with the molar ratio of organic groups/silicon atoms of 0.5 to 1.7, (d) an organosilane compound such as vinyl trimethoxysilane or vinyl tris(2-methoxyethoxy) silane, (e) a finely divided silica filler, (f) an organic peroxide and (g) a curing agent for silicone resins, all in limited weight proportions.

REFERENCES:
patent: 2803619 (1957-08-01), Dickmann
patent: 3699073 (1972-10-01), Wada et al.
patent: 3769253 (1973-10-01), Stevenson
patent: 3779986 (1973-12-01), Smith et al.

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