Stock material or miscellaneous articles – Composite – Of silicon containing
Patent
1991-03-26
1995-11-14
Bleutge, John C.
Stock material or miscellaneous articles
Composite
Of silicon containing
528 15, 528 31, 528 32, 525478, B32B 2708
Patent
active
054665329
ABSTRACT:
Solventless and high solids-containing silicone pressure sensitive adhesive compositions having high peel adhesion and high tack are provided, comprising (A) a toluene-soluble resinous copolymer containing R.sub.3 SiO.sub.1/2 units and SiO.sub.4/2 units; (B) a vinyl-terminated polydiorganosiloxane; (C) a hydrogen-terminated polydiorganosiloxane; (D) a hydrosilation catalyst; and (E) from 0 to about 10 percent by weight of an organic solvent; provided that the combined viscosity of (B) and (C)is from about 10 to about 500 centipoises at 25.degree. C., the combined crosslink densities of (B) and (C) is from about 0.3 to about 5.0%, preferably 0.3 to about 2.0%, and the molar ratio of silicon-bonded hydrogen groups in (C) to silicon-bonded alkenyl groups in (B) is in the range of from about 0.8:1 to about 1.5:1 and preferably about 1:1.
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Burnell Timothy B.
Van Valkenburgh Virginia M.
Wengrovius Jeffrey H.
Bleutge John C.
Glass Margaret W.
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