Patent ID: 11912801
Assignee: 3M INNOVATIVE PROPERTIES COMPANY
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A curable composition comprising:
a multifunctional urethane (meth)acrylate oligomer, wherein the multifunctional urethane (meth)acrylate oligomer is of the general formula:, wherein
Z is an ethylenically unsaturated, free radical polymerizable group,
RISO is the residue of a polyisocyanate having at least two of its—NCO groups reacted to form a urethane bonding Z to ROH, subscript a is 0 or 1, b is 2-6, and
ROH is the residue of a polyol having at least a+b hydroxyl groups and a number average molecular weight between 90 and 10,000, the residue formed by removal of hydrogen from the hydroxyl groups;
optionally a reactive diluent;
an initiator;
a multifunctional (meth)acrylate crosslinker containing no urethane functional groups; and
an adhesion promoter of the formula:, , wherein

R1 is H or C1-C4 alkyl
R2 and R3 are each independently a (hetero)hydrocarbyl group;
R5 is H or C1-C4 alkyl;
X1 is -O- or -NR4-, where R4 is H or C1-C4 alkyl,
subscript x is 1 or 2; and
subscript y is 1 or 2;
wherein the curable composition comprises 0.1 pbw to about 10 pbw of the multifunctional (meth)acrylate crosslinker based on 100 pbw of the total polymerizable components of the composition.