Patent ID: 7956123

Claim:
A solvent resistant adhesive composition comprising: (i) a hydroxyl terminated or urea terminated or hydrocarbon terminated unsaturated polyurethane derived from a hydroxyl-terminated vinyl-containing branched butadiene polymer, wherein the butadiene polymer has a molecular weight (Mn) of from 500 to 10,000, an average content of copolymerized additional monomer of from 0 to 50 weight percent, hydroxyl groups per polymer of from 2.4 to 2.8 and terminal hydroxyl groups bonded to carbon atoms adjacent to double bonded carbon atoms, and a polyisocyanate and, (ii) a peroxide capable of generating free radicals or a silicone hydride providing SiH, wherein components (i) and (ii) are present in an amount sufficient to provide a molar ratio of unsaturated sites of component (i) relative to SiH or free radicals of component (ii) between 514 and 824, wherein the silicone hydride is a substantially linear hydrogen siloxane having a formula selected from the group consisting of MD e D′ f M, MD′ f M′, M′D e D′ f M′ and M′D e M′, wherein M is defined as R 3 SiO 1/2 M′ is defined as H g R 3-g SiO 1/2 D=RRSiO 2/2, and D′=RHSiO 2/2 where each R is independently a monovalent hydrocarbon radical of from about 1 to 40 carbon atoms, the subscripts e and f may be zero or positive wherein the sum of e and f ranges from about 10 to about 100, with the proviso that the sum of f and g is at least 2; and wherein the peroxide is one or more compound selected from the groups consisting of di-tert-butyl peroxide, dicumyl peroxide, cumene hydroperoxide, tert-butyl hydroperoxide, tert-butyl perbenzoate, tert-butyl per-3,5,5-trimethylhexanoate, tert-butyl per-2-ethylhexanoate, and benzoyl peroxide.