Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
255 words
A graft copolymer of the formula X.sub.m Y.sub.n Y'.sub.p (Z.sub.q).sub.r wherein X is an isobutylene monomer unit, Y is a vinylbenzene monomer unit of the formula ##STR6## in which Q is hydrogen or lower alkyl R is halogen, lower alkyl, chloro lower alkyl, lower alkoxy, or two adjacent R's together are methylenedioxy, and s is an integer from 0 to 5, Y' is a carboxylated Y unit, Z is a pivalolactone monomer unit, m represents the number of isobutylene monomer units in the copolymer, n represents the number of non-carboxylated vinylbenzene monomer units in the copolymer, p represents the number of carboxylated vinylbenzene monomer units in the copolymer and is 5 to 100% of (n + p), m and (n + p) are in an m: (n + p) ratio of 2:1 to 1000:1, q represents the number of pivalolactone monomer units per polypivalolactone side chain graft and is in the range of 2 to 500, r represents the number of polypivalolactone side chain grafts in the graft copolymer and is substantially equal to p, X, y and Y' are randomly interconnected through carbon to carbon linkages with single Y and Y' units predominantly connected only to X units, Z q is a single polypivalolactone side chain grafted to a Y' unit through the carboxyl group, and (Z q ) r is 3 to 80% by weight of the graft copolymer, and the copolymer has an X m Y n Y' p equivalent weight per carboxyl group of 200 to 1 × 10 5 .
Claim 2
Dependent Claim
255 words
A graft copolymer of the formula X.sub.m Y.sub.n Y'.sub.p (Z.sub.q).sub.r wherein X is an isobutylene monomer unit, Y is a vinylbenzene monomer unit of the formula ##STR6## in which Q is hydrogen or lower alkyl R is halogen, lower alkyl, chloro lower alkyl, lower alkoxy, or two adjacent R's together are methylenedioxy, and s is an integer from 0 to 5, Y' is a carboxylated Y unit, Z is a pivalolactone monomer unit, m represents the number of isobutylene monomer units in the copolymer, n represents the number of non-carboxylated vinylbenzene monomer units in the copolymer, p represents the number of carboxylated vinylbenzene monomer units in the copolymer and is 5 to 100% of (n + p), m and (n + p) are in an m: (n + p) ratio of 2:1 to 1000:1, q represents the number of pivalolactone monomer units per polypivalolactone side chain graft and is in the range of 2 to 500, r represents the number of polypivalolactone side chain grafts in the graft copolymer and is substantially equal to p, X, y and Y' are randomly interconnected through carbon to carbon linkages with single Y and Y' units predominantly connected only to X units, Z q is a single polypivalolactone side chain grafted to a Y' unit through the carboxyl group, and (Z q ) r is 3 to 80% by weight of the graft copolymer, and the copolymer has an X m Y n Y' p equivalent weight per carboxyl group of 200 to 1 × 10 5 .
Claim 3
Dependent Claim
38 words
The graft copolymer of claim 1 in which the non-carboxylated isobutylene/vinylbenzene copolymer from which the graft copolymer is obtained by carboxylation and grafting has a molecular weight in the range of 1000 to 5 × 10 6 .
Claim 4
Dependent Claim
21 words
The graft copolymer of claim 2 in which the vinylbenzene is selected from the group consisting of vinyltoluene, styrene and α-methylstyrene.
Claim 5
Dependent Claim
82 words
The graft copolymer of claim 3 in which the non-carboxylated substrate copolymer has a molecular weight in the range of 2000 to 2 × 10 6 , m: (n + p) is in a ratio of 5:1 to 600:1, there are 3 to 250 pivalolactone monomer units per polypivalolactone side chain graft, the pivalolactone is 5 to 60% by weight of the graft copolymer, and the copolymer has an equivalent weight per carboxyl group of 600 to 6 × 10 4 .
Claim 6
Dependent Claim
84 words
The graft copolymer of claim 3 in which the noncarboxylated substrate copolymer has a molecular weight in the range of 5000 to 1 × 10 6 , m: (n + p) is in a ratio of 8:1 to 440:1, there are 5 to 200 pivalolactone monomer units per polypivalolactone side chain graft, the amount of pivalolactone in the graft copolymer is 10 to 50% by weight, and the copolymer has an equivalent weight per carboxyl group of 1000 to 5 × 10 4 .
Claim 7
Dependent Claim
12 words
The graft copolymer of claim 5 in which the vinylbenzene is vinyltoluene.
Claim 8
Dependent Claim
12 words
The graft copolymer of claim 5 in which the vinylbenzene is styrene.
Claim 9
Dependent Claim
12 words
The graft copolymer of claim 5 in which the vinylbenzene is α-methylstyrene.