Patent US3695747A successfully refreshed from Google Patents.
EP0149038A2
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EP
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Cationic copolymerization of meta- or paraisopropenyl-alpha,alpha-dimethylbenzylisocyanate
Assignee: Wyeth Holdings LLC
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Filing: 1984-11-06
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Granted: —
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Expires: 2004-11-06
Abstract
Abstract A method of making an organic solvent-soluble, substantially linear copolymer of meta- or para-isopropenyl-a, a-dimethylbenzylisocyanate and at least one other ethylenically unsaturated non-methacrylate or nonacrylate comonomer selected from the group consisting of styrene, α-methylstyrene, p-methyl-α-methylstyrene, and p-methylstyrene, comprising polymerizing the meta- or para-isopropenyl-a, a-dimethylbenzylisocyanate and said at least one other ethylenically unsaturated comonomer in non-aqueous solution and in the presence of a cationic polymerization catalyst.
Inventors
- 👤 Peter Salvatore Forgione
- 👤 John Andrew Sedlak
- 👤 Balwant Singh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 11:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/04; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/12; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/302; C08G18/305; C09; C09D; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
77 words
A method of making an organic solvent-soluble, substantially linear copolymer of meta- or para-isopropenyl- a, a-dimethylbenzylisocyanate and at least one other ethylenically unsaturated comonomer which is not an acrylate or a methacrylate and which is selected from the group consisting of styrene, a-methylstyrene, p-methyl- a-methylstyrene, and p-methylstyrene, comprising solution polymerizing said meta- or para- isopropenyla, a-dimethylbenzylisocyanate and said at least one other ethylenically unsaturated comonomer in non-aqueous solution and in the presence of a cationic polymerization catalyst.
Claim 2
Independent Claim
77 words
A method of making an organic solvent-soluble, substantially linear copolymer of meta- or para-isopropenyl- a, a-dimethylbenzylisocyanate and at least one other ethylenically unsaturated comonomer which is not an acrylate or a methacrylate and which is selected from the group consisting of styrene, a-methylstyrene, p-methyl- a-methylstyrene, and p-methylstyrene, comprising solution polymerizing said meta- or para- isopropenyla, a-dimethylbenzylisocyanate and said at least one other ethylenically unsaturated comonomer in non-aqueous solution and in the presence of a cationic polymerization catalyst.
Claim 3
Dependent Claim
16 words
A method according to Claim 1 wherein said solution polymerization is conducted in methylene chloride solution.
Claim 4
Dependent Claim
26 words
A method according to Claim 1 wherein said cationic polymerization catalyst is selected from the group consisting of BF Et 2 0 and SnCl 4 .
Claim 5
Dependent Claim
59 words
A method according to Claim 1 wherein said copolymer contains from about 5 to about 80 mole percent repeating units derived from meta- or para- isopropenyl-α, a-dimethylbenzylisocyanate and from about 20 to about 95 mole percent repeating units derived from said at least one other ethylenically unsaturated comonomer, having a molecular weight of from about 500 to about 500,000.
Claim 6
Dependent Claim
20 words
A method according to Claim 4 wherein said copolymer has a molecular weight of from about 20,000 to about 50,000.
Claim 7
Dependent Claim
74 words
A method according to Claim 1, wherein said copolymer contains from about 30 to about 80 mole percent repeating units derived from meta- or para-isopropenyl- a , a -dimethylbenzylisocyanate and from about 20 to about 70 mole percent repeating units derived from styrene or a -methylstyrene wherein said cationic polymerization catalyst is BF 3 Et 2 0, and wherein the solution polymerization is carried out at temperature of from about -80°C to about 0°C.
Claim 8
Dependent Claim
98 words
A method according to Claim 6, comprising: (a) forming a reaction mixture comprising non-aqueous solvent, BF 3 Et 2 O, and all of the meta- or para-isopropenyl- α, a -dimethylbenzylisocyanate to be incorporated into said copolymer and from 25 to about 50 percent of said total amount of styrene or a-methylstyrene to be incorporated into said copolymer; and (b) adding the remaining portion of said styrene or a -methylstyrene to said reaction volume under polymerization reaction conditions while maintaining a substantially constant monomeric composition in said reaction mixture to form the copolymer having a substantially homogeneous polymeric composition.
Claim 9
Dependent Claim
19 words
A method according to Claim 6, wherein additional cationic polymerization catalyst is added in the course of the copolymerization.
Claim 10
Dependent Claim
9 words
A copolymer formed by the method of Claim 1.
Claim 11
Dependent Claim
39 words
A copolymer according to Claim 9 containing from about 5 to about 80 percent repeating units derived from meta- or para-isopropenyl- a,a -dimethylbenzylisocyanate and from about 20 to about 95 mole percent repeating units derived from styrene or a-methylstyrene.
Claim 12
Dependent Claim
40 words
A copolymer according to Claim 9 having from about 40 to about 70 mole percent repeating units derived from meta- or para-isopropenyl- a, a-dimethylbenzylisocyanate, and from about 30 to about 60 mole percent repeating units derived from styrene or a-methylstyrene.
Claim 13
Dependent Claim
17 words
A copolymer according to Claim 11 having a molecular weight of from about 20,000 to about 50,000.
Claim 14
Dependent Claim
71 words
A method of forming a copolymer according to Claim 10, comprising solution polymerizing said met 4 -or para-isopropenyl- a,a-dimethylbenzylisocyanate and styrene or a-methylstyrene in a mixed solvent comprising methylene chloride and toluene and in the presence of a cationic polymerization catalyst selected from the group consisting of BF Et 0 and SnCl 4 , wherein said polymer- ization is carried out at a temperature of from about -80°C to about 0°C.
Claim 15
Dependent Claim
93 words
A method according to Claim 13, comprising: (a) forming a reaction volume comprising said solvent, cationic polymerization catalyst, all of said styrene or a-methylstyrene to be incorporated into said copolymer, and from about 25 to about 50 percent of the amount of metaor para-isopropenyl- a, a-dimethylbenzylisocyanate to be incorporated into said copolymer; and (b) adding the remaining portion of meta- or para-isopropenyl- a, a-dimethylbenzylisocyanate to said reaction volume under polymerization reaction conditions while maintaining a substantially constant monomer composition in said reaction volume, to form said copolymer with a substantially homogeneous polymeric composition.
References Cited (Backward Citations)
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