Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
155 words
A process for producing a thermoplastic elastomer comprising a block copolymer of the A-B-A' type, wherein A is a monovinyl aromatic hydrocarbon polymer block, B is a conjugated diolefin polymer block, and A' is either the same as .A or a polymer'block derived, from a dialkenyl aromatic hydrocarbon or a dihalogenated hydrocarbon, which process comprises polymerizing a monovinyl aromatic hydrocarbon in·a polymerization medium in the presence of an organomonolithium compound as a polymerization initiator, adding a conjugated diolefin .to perform block copolymerization, and further adding a monovinyl aromatic hydrocarbon to perform polymerization, or in the alternative, adding a dialkenyl aromatic hydrocarbon or a dihalogenated hydrocarbon to perform -coupling, characterised in that the monomer components are used in such amounts that the weight ratio of (A + A') to B is from 10/90 to 65/35,and a chained aliphatic hydrocarbon solvent containing from 0.0001 to 0.1 wt% of a Lewis base is used as the polymerization medium.
Claim 2
Dependent Claim
155 words
A process for producing a thermoplastic elastomer comprising a block copolymer of the A-B-A' type, wherein A is a monovinyl aromatic hydrocarbon polymer block, B is a conjugated diolefin polymer block, and A' is either the same as .A or a polymer'block derived, from a dialkenyl aromatic hydrocarbon or a dihalogenated hydrocarbon, which process comprises polymerizing a monovinyl aromatic hydrocarbon in·a polymerization medium in the presence of an organomonolithium compound as a polymerization initiator, adding a conjugated diolefin .to perform block copolymerization, and further adding a monovinyl aromatic hydrocarbon to perform polymerization, or in the alternative, adding a dialkenyl aromatic hydrocarbon or a dihalogenated hydrocarbon to perform -coupling, characterised in that the monomer components are used in such amounts that the weight ratio of (A + A') to B is from 10/90 to 65/35,and a chained aliphatic hydrocarbon solvent containing from 0.0001 to 0.1 wt% of a Lewis base is used as the polymerization medium.
Claim 3
Dependent Claim
41 words
A process according to Claim 1, wherein the weight ratio of (A + A') to B is from 10:90 to 50:50, and the content of the Lewis base compound in the chained aliphatic hydrocarbon solvent is from 0.0005 to 0.01 wt%.
Claim 4
Dependent Claim
21 words
A process according to Claim 2, wherein the weight ratio of (A + A') to B is from 10:90 to 30:70.
Claim 5
Dependent Claim
19 words
A process according to Claim 1,2 or 3, wherein the Lewis base is a cyclic ether or a polyether.
Claim 6
Dependent Claim
13 words
A process according to Claim 4, wherein the Lewis base compound is tetrahydrofuran.
Claim 7
Dependent Claim
24 words
- 6. A process-according to any preceding Claim, wherein the solvent is a straight or branched aliphatic .hydrocarbon having 4 to 10 carbon atoms.
Claim 8
Dependent Claim
14 words
A process according to Claim 6, wherein the chained aliphatic hydrocarbon solvent is hexane.
Claim 9
Dependent Claim
21 words
A process according to any preceding claim, wherein the organomonolithium compound is n-butyl lithium, sec-butyl .lithium, tert-butyl lithium or cyclohexyl lithium.
Claim 10
Dependent Claim
14 words
A process according to any preceding claim, wherein the monovinyl aromatic hydrocarbon is styrene.
Claim 11
Dependent Claim
15 words
A process according to any previous claim, wherein the conjugated diolefin is 1,3-butadiene or isoprene.
Claim 12
Dependent Claim
17 words
A process according to any of Claims 1 to 10, wherein the dialkenyl aromatic hydrocarbon is divinylbenzene.
Claim 13
Dependent Claim
16 words
A process according to any of Claims 1 to 10, wherein the dihalogenated hydrocarbon is dibromomethane.