Moisture-curable polyolefin pressure-sensitive adhesive
AssigneeMinnesota Mining and Manufacturing Company
InventorsGaddam N. Babu, James R. Peterson, Sehyun Nam
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Abstract
A pressure-sensitive adhesive comprises a moisture-curable polymer comprising a polymer prepared by polymerization of at least one .alpha.-olefin monomer, said polymer containing hydrolyzable or condensable silyl groups and having a weight average molecular weight of at least 30,000. The pressure-sensitive adhesive can be hot-melt coated without emitting volatiles and then can adhere aggressively to both polar and nonpolar substrates. The PSA has good internal strength at high temperatures.
Claims7
An article comprising a polar or nonpolar substrate and coated on at least one surface thereof a layer of pressure-sensitive adhesive comprising a tacky moisture-curable copolymer comprising a polymeric .alpha.-olefin backbone and having the general formula:
- (M.sup.1).sub.x --(M.sup.2).sub.y --(M.sup.3).sub.z
- wherein
- x, y, and z are numbers designating the relative molar amounts of M.sup.1, M.sup.2, and M.sup.3 units that are randomly located in the backbone chain of the copolymer such that the copolymer has a weight average molecular weight of at least 50,000, x is at least 60% of x+y, and z is 0.1 to 10% of x+y+z;
- M.sup.1 is a divalent unit present in a polymer formed on polymerization of an .alpha.-olefin having 6 to 14 carbon atoms;
- M.sup.2 is a saturated or unsaturated divalent unit present in a polymer formed by polymerization of an ethylenically-unsaturated hydrocarbon selected from .alpha.-olefins having 2 to 14 carbon atoms, non-conjugated dienes having 5 to 20 carbon atoms, and non-conjugated mono- and polyethylenically-unsaturated mono- and polycyclic hydrocarbons having 6 to 20 carbon atoms;
- M.sup.3 is the same as M.sup.2 but is substituted by a hydrolyzable or condensable silyl group;
- said copolymer when cured being tacky.
Dependencies are inferred from the claim text.