Gels from silane-coupled block copolymers
AssigneeKraton Polymers U.S. LLC
InventorsDale Lee Handlin JR., Carl Lesley Willis, David John St. Clair
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Abstract
The present invention relates to gels prepared from novel anionic block copolymers of mono alkenyl arenes and conjugated dienes, and to blends of such block copolymers with other polymers. The block copolymers are selectively hydrogenated and have mono alkenyl arene end blocks and conjugated diene mid blocks. The block copolymer may be combined with tackifying resins, oils and other components to form the gels of the present invention.
Claims25
An oil gel composition comprising 100 parts by weight of at least one hydrogenated block copolymer composition and about 300 to about 2000 parts by weight of an extending oil, said hydrogenated block copolymer comprising:
- a. a linear diblock copolymer (I) having a number average molecular weight of from 25,000 to 200,000 represented by the general formula A-B;
- b. a di-branched block copolymer (II) having a number average molecular weight of from 50,000 to 400,000 represented by the general formula (A-B)2X;
- c. a tri-branched block copolymer (III) having a number average molecular weight of from 75,000 to 600,000 represented by the general formula (A-B)3X;
- and
- d. a tetra-branched block copolymer (IV) having a number average molecular weight of 100,000 to 800,000 represented by the general formula (A-B)4X where:
- i. A represents a polymer block of a mono alkenyl arene;
- ii. B represents a polymer block of a hydrogenated conjugated diene;
- iii. X represents the residue of an alkoxy silane coupling agent having the formula Rx—Si—(OR′)y, where x is 0 or 1, x+y=4, R and R′ are the same or different, R is selected from aryl hydrocarbon radicals, linear alkyl hydrocarbon radicals and branched alkyl hydrocarbon radicals, and R′ is selected from linear and branched alkyl hydrocarbon radicals;
- and
- iv. the relative amounts of copolymers I, II, III and IV are from 2 to 10 weight percent I, from 40 to 95 weight percent II, from 0 to 60 weight percent III, from 0 to 5 weight percent IV, and where the total of I, II, III and IV equals 100 weight percent.
An oil gel composition comprising 100 parts by weight of at least one hydrogenated block copolymer composition and about 300 to about 2000 parts by weight of an extending oil, said hydrogenated block copolymer comprising:
- a. a linear diblock copolymer (I) having a number average molecular weight of from 25,000 to 200,000 represented by the general formula C-D-E;;
- b. a di-branched block copolymer (II) having a number average molecular weight of from 50,000 to 400,000 represented by the general formula (C-D-E)2X;
- c. a tri-branched block copolymer (III) having a number average molecular weight of from 75,000 to 600,000 represented by the general formula (C-D-E)3X;
- and
- d. a tetra-branched block copolymer (IV) having a number average molecular weight of 100,000 to 800,000 represented by the general formula (C-D-E)4X where:
- i. C represents a polymer block of a hydrogenated conjugated diene;
- ii. D represents a polymer block of a mono alkenyl arene;
- iii. E represents a polymer block of a hydrogenated conjugated diene;
- iv. X represents the residue of an alkoxy silane coupling agent having the formula Rx—Si—(OR′)y, where x is 0 or 1, x+y=4, and R and R′ are the same or different, R is selected from aryl hydrocarbon radicals, linear alkyl hydrocarbon radicals and branched alkyl hydrocarbon radicals, and R′ is selected from linear and branched alkyl hydrocarbon radicals;
- and
- iv. the relative amounts of copolymers I, II, III and IV are from 2 to 10 weight percent I, from 40 to 95 weight percent II, from 0 to 60 weight percent III, from 0 to 5 weight percent IV, and where the total of I, II, III and IV equals 100 weight percent.
Dependencies are inferred from the claim text.