Silicone pressure sensitive adhesive compositions having high so

Details Silicone pressure sensitive adhesive compositions having high so Silicone pressure sensitive adhesive compositions having high so

1991-03-26

1993-03-02

Marquis, Melvyn I.

Stock material or miscellaneous articles

Composite

Of silicon containing

525477, 528 31, 528 32, 528 15, B32B 904

Patent

active

051908271

ABSTRACT:
A solventless or high solids-containing organopolysiloxane composition curable to produce a pressure sensitive adhesive having high tack and hig peel adhesion, comprising (A) a toluene soluble, resinous copolymer comprising R.sub.3 SiO.sub.1/2 units and SiO.sub.4/2 units; (B) an alkenyl-terminated polydiorganosiloxane having a viscosity of from about 10 to about 500 centipoise at 25.degree. C.; (C) from 0 to about 90 mole % of a hydride-terminated organohydrogenpolysiloxane having a viscosity of from about 10 to about 1000 centipoise at 25.degree. C.; (D) from about 10 to about 100 mole % of a hydrogen-containing polydiorganosiloxane crosslinking agent; the combined average hydride equivalent weight of (C) and (D) being at least 1500 grams/silicon-bonded hydrogen atom; the mole percentages of (C) and (D) being based on the total silicon-bonded hydrogen content of (C) and (D); the total of (B), (C) and (D) being from about 25 to about 50 parts by weight; the total of (A), (B), (C) and (D) being 100 parts by weight; the ratio of silicon-bonded hydrogen atoms in (C) and (D) to olefinically unsaturated radicals in the total of (A) and (B) being in the range of from about 1.1:1 to about 15.0:1; (E) a catalytic amount of a hydrosilation catalyst; and (F) from 0 to about 40% by weight of an organic solvent.

REFERENCES:
patent: 4293671 (1981-10-01), Sasaki et al.
patent: 4774297 (1988-09-01), Murakami et al.
patent: 4988779 (1991-01-01), Medford et al.

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