Pressure-sensitive adhesive based on ethylenically-unsaturated α-olefin polymer cured with hydrosilane

Claim 1

A pressure-sensitive adhesive comprising a curable blend of an ethylenically-unsaturated α-olefin polymer, a crosslinker having at least 2 hydrosilyl groups, and hydrosilation catalyst, wherein said ethylenically-unsaturated α-olefin polymer has the formula: ##STR14## wherein: x, y, and z are numbers designating the relative molar amounts of M 1 , M 2 , and M 3 units that are randomly located in the backbone chain of the polymer such that the polymer has a weight average molecular weight in the range of 30,000 to 3.5 million, x is at least 60 mole % of x+y wherein y can be zero, and z is 0.1 to 10 mole % of x+y+z; M 1 is an ethanediyl repeat unit of the polymer each having at least one pendant alkyl group having 4 to 12 carbon atoms; M 2 , when present, is different from M 1 , and is an ethanediyl repeat unit selected from 1) ethylene, 2) units having a pendant hydrocarbyl group selected from linear or branched alkyl groups having 1 to 18 carbon atoms, and cyclic and aryl pendant groups having 5 to 18 carbon atoms, and 3) 1,2-cyclopentylene and 1,2-cyclohexylene groups having 5 to 18 carbon atoms; and M 3 is an ethanediyl repeat unit having a pendant ethylenically unsaturated aliphatic or aryl group selected from the group consisting of 1) linear and branched mono- and polyethylenically unsaturated hydrocarbyl groups having 3 to 18 carbon atoms, 2) cyclic mono- and polyethylenically-unsaturated aliphatic groups having 5 to 18 carbon atoms, 3) aryl groups substituted by mono- or polyethylenically-unsaturated groups having a total of 7 to 18 carbon atoms, and 4) cycloalkenylene groups having 6 to 18 carbon atoms, wherein the cyclic group has at least 6 carbon atoms in the ring, provided that the ethylenically-unsaturated moiety ##STR15## is not bonded directly to a backbone carbon atom.