Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1999-09-07
2000-09-19
Moore, Margaret G.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
525478, 524266, 524268, 524312, 524313, 524388, 524383, 524503, 524506, C08K 501, C08K 336
Patent
active
061213683
ABSTRACT:
A silicone composition for preparing a silicone pressure sensitive adhesive, the composition comprising (A) 20 to 55 parts by weight of a polydiorganosiloxane containing an average of at least two silicon-bonded alkenyl groups per molecule; (B) 45 to 80 parts by weight of an organopolysiloxane resin comprising R.sup.3.sub.3 SiO.sub.1/2 units and SiO.sub.4/2 units wherein each R.sup.3 is independently selected from the group consisting of monovalent hydrocarbon and monovalent halogenated hydrocarbon groups, the mole ratio of R.sup.3.sub.3 SiO.sub.1/2 units to SiO.sub.4/2 units is from 0.6:1 to 1.5:1, the resin contains less than about 2 mole percent of alkenyl groups, and the total amount of components (A) and (B) is 100 parts by weight; (C) an organohydrogenpolysiloxane having an average of at least two silicon-bonded hydrogen atoms per molecule in an amount sufficient to cure the composition; (D) a thixotropic agent in an amount sufficient to impart thixotropy to the composition; and (E) a catalytic amount of a hydrosilylation catalyst; wherein the sum of the average number of silicon-bonded alkenyl groups per molecule in component (A) and the average number of silicon-bonded hydrogen atoms per molecule in component (C) is greater than 4. A silicone pressure sensitive adhesive comprising a reaction product of the silicone composition. A multi-part silicone composition comprising components (A) through (E) in two or more parts, provided neither component (A) nor component (B), when components (B) contains alkenyl groups, are present with components (C) and (E) in the same part.
REFERENCES:
patent: 4988779 (1991-01-01), Medford et al.
patent: 5232702 (1993-08-01), Pfister et al.
patent: 5328696 (1994-07-01), Noel
patent: 5658975 (1997-08-01), Ulman et al.
Heying Michael David
Lutz Michael Andrew
Moline Patricia Kathryn
Watson Michael John
Dow Corning Corporation
Milco Larry A.
Moore Margaret G.
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