Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-03-31
1996-04-16
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528 38, 528 34, 528 39, C08F28312
Patent
active
055083609
ABSTRACT:
The present invention relates to a silicone pressure-sensitive adhesive composition which cure upon exposure to ambient moisture. The moisture-curable silicone pressure-sensitive adhesive composition of the instant invention comprise:
(A) an organopolysiloxane resin containing curing radicals of the formula --SiY.sub.2 ZNY'ZSiR.sup.1.sub.x Y".sub.3-x wherein R.sup.1 is a monovalent hydrocarbon radical, each Z is a divalent linking group, each Y is independently selected from the group consisting of a monovalent organic radical, an enoloxy radical, an alkoxy radical, and an oximo radical; Y' is selected from the group consisting of a monovalent organic radical, a hydrogen atom, and --ZSiR.sup.1.sub.x Y".sub.3-x ; Y" is selected from the group consisting of an enoloxy radical, an alkoxy radical, and an oximo radical; and the subscript x has a value of 0 or 1; (B) a diorganopolysiloxane polymer, each terminal group thereof containing at least one silicon-bonded hydrolyzable functional radicals selected from the group consisting of hydroxyl radicals, alkoxy radicals having 1 to 4 carbon atoms, ketoxime radicals, enoloxy radicals, aminoxy radicals, acetamido radicals, N-methylacetamido radicals and acetoxy radicals; said polymer having a viscosity at 25.degree. C. of 20 to <100,000 mm.sup.2 /s and the weight ratio of said resin to said polymer being in the range 5:95 to 90:10; (C) optionally, sufficient catalyst to accelerate the cure of said composition; (D) optionally a silane of the formula R.sup.2.sub.4-y SiX.sub.y or oligomeric reaction product thereof, in which R.sup.2 is selected from the group consisting of hydrocarbon radicals and substituted hydrocarbon radical having 1 to 6 carbon atoms, X is a hydrolyzable group and y is 2 to 4; and (E) optionally, a filler.
REFERENCES:
patent: 4143088 (1979-03-01), Favre et al.
patent: 5013577 (1991-05-01), Wright et al.
patent: 5091484 (1992-02-01), Colas et al.
patent: 5302671 (1994-04-01), Cifuentes et al.
Cifuentes Martin E.
Lutz Michael A.
Schmidt Randall G.
Strong Michael R.
VanWert Bernard
Dow Corning Corporation
Glass Margaret
Marquis Melvyn I.
Severance Sharon K.
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