EP0046668A2
Expired / Lapsed
EP
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Process for producing high impact polystyrene
Assignee: Japan Elastomer Co Ltd
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Filing: 1981-08-21
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Granted: —
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Expires: 2001-08-21
Abstract
Abstract A process for producing a high impact polystyrene characterized by polymerizing a conjugated diene (preferably, 1,3-butadiene) by the use of an organolithium-based catalyst containing a polyfunctional organolithium compound (preferably, said organolithium-based catalyst is a mixture of a polyfunctional organolithium compound and a monofunctional organolithium compound at such a mixing ratio that the amount of lithium atom in the polyfunctional organolithium compound is 5% by weight or more based on the total sum of the lithium atoms in the respective compounds), coupling the resulting polymer molecules with a polyfunctional treating agent having at least two (preferably, 2-4 on the average) reactive sites capable of reacting with the active lithium terminal of the polymer, dissolving in styrene the conjugated diene polymer thus obtained, which has substantially a network structure and is substantially soluble in styrene, preferably in a proportion of 2 - 30% by weight, and then radical-polymerizing the resulting solution by bulk polymerization or bulk-suspension polymerization.
Inventors
- 👤 Osamu Teranaka
- 👤 Tsutomu Kakutani
- 👤 Haruro Tabata
- 👤 Tutomu Teraoka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 15:20
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
84 words
A process for producing a high impact polystyrene, characterized by polymerizing a conjugated diene by the use of an organolithium-based catalyst containing a polyfunctional organolithium compound, then coupling the resulting polymer molecules with a polyfunctional treating agent having at least two reactive sites capable of reacting with the active lithium terminal of the polymer, dissolving in styrene the conjugated diene polymer thus obtained having substantially a network structure and substantially soluble in styrene, and radical-polymerizing the resulting solution by bulk polymerization or bulk-suspension polymerization.
Claim 2
Dependent Claim
84 words
A process for producing a high impact polystyrene, characterized by polymerizing a conjugated diene by the use of an organolithium-based catalyst containing a polyfunctional organolithium compound, then coupling the resulting polymer molecules with a polyfunctional treating agent having at least two reactive sites capable of reacting with the active lithium terminal of the polymer, dissolving in styrene the conjugated diene polymer thus obtained having substantially a network structure and substantially soluble in styrene, and radical-polymerizing the resulting solution by bulk polymerization or bulk-suspension polymerization.
Claim 3
Dependent Claim
62 words
A process according to Claim 1, wherein said organolithium-based catalyst is a mixture of a polyfunctional organolithium compound and a monofunctional organolithium compound and the ratio between these two compounds satisfies the requirement that the amount of lithium atom in the polyfunctional organolithium compound is 5% by weight or more based on the total sum of lithium atoms in the respective compounds.
Claim 4
Dependent Claim
27 words
A process according to Claim 1, wherein said organolithium-based catalyst is a reaction product between at least two members of monofunctional organolithium compound and polyvinyl aromatic compound.
Claim 5
Dependent Claim
26 words
A process according to Claim 3, wherein the molar ratio of said polyvinyl aromatic compound to said monofunctional organolithium compound is 0.1 : 1 or more.
Claim 6
Dependent Claim
23 words
A process according to Claim 3 or 4, wherein said polyvinyl aromatic compound is divinylbenzene, 1,2,4-trivinylbenzene, 1,3-divinylnaphthalene, 1,3,5- trivinylnaphthalene, 2,4-divinylbiphenyl or 3,4,5- trivinylbiphenyl.
Claim 7
Dependent Claim
15 words
A process according to Claim 3 or 4, wherein said polyvinyl aromatic compound is divinylbenzene.
Claim 8
Dependent Claim
19 words
A process according to Claim 1, 2 or 3, wherein said conjugated diene has 4 - 12 carbon atoms.
Claim 9
Dependent Claim
21 words
A process according to Claim 1, 2 or 3, wherein said conjugated diene is 1,3-butadiene, isoprene, 2,3-dimethyl-l,3-butadiene, piperylene, 1,3-octadiene or 4,5-diethyl-1,3-octadiene.
Claim 10
Dependent Claim
15 words
A process according to Claim 1, 2 or 3, wherein said conjugated diene is 1,3-butadiene.
Claim 11
Dependent Claim
36 words
A process according to Claim 1 or 2, wherein said polyfunctional organolithium compound is dilithiomethane, 1,4-dilithiobutane, 1,6-dilithiohexane, 1,4- dilithiocyclohexene, 1,4-dilithio-2-ethylcyclohexane, 1,3-dilithio-4-phenylbutane, 1,2-dilithio-1,2-diphenylethane, 1,10-dilithiodecane, 1,20-dilithioeicosane, 1,1-dilithiodiphenylene, 1,4-dilithiobenzene, 1,5- dilithionaphthalene, dilithiopolybutadiene, dilithioisoprene, dilithiodiisoprene, dilithiopolyisoprene, 2,2',2"-trilithio-p-terphenyl, 1,3,5-trilithiobenzene, or 1,3,5-trilithio-2,4,6-triethylbenzene.
Claim 12
Dependent Claim
14 words
A process according to Claim 1 or 2, wherein said polyfunctional compound is 1,2-dilithio-1,2-diphenylethane.
Claim 13
Dependent Claim
23 words
A process according to Claim 1, wherein a 1,2-vinyl content regulator is allowed to coexist at the time of polymerizing said conjugated diene.
Claim 14
Dependent Claim
23 words
A process according to Claim 12, wherein said 1,2-vinyl content regulator is dimethyl ether, diethyl ether, tetrahydrofuran, dimethylamine, dimethyl sulfide or diethyl sulfide.
Claim 15
Dependent Claim
13 words
A process according to Claim 12, wherein said 1,2-vinyl content regualtor is tetrahydrofuran.
Claim 16
Dependent Claim
27 words
A process according to Claim 12, 13 or 14, wherein said conjugated diene is 1,3-butadiene and the resulting polybutadiene has a 1,2-vinyl content of 35% or less.
Claim 17
Dependent Claim
31 words
A process according to Claim 1, wherein the number of reactive sites, capable of reacting with active lithium terminal, in said polyfunctional treating agent is 2 - 4 on the average.
Claim 18
Dependent Claim
39 words
A process according to Claim 1 or 16, wherein the amount of said polyfunctional treating agent is 0.1 - 2 equivalents based on the lithium in the lithium- terminated polymer obtained by polymerizing a conjugated diene with organolithium-based catalyst.
Claim 19
Dependent Claim
24 words
A process according to Claim 1, wherein said conjugated diene polymer is dissolved in a proportion of 2 - 30% by weight in styrene.
References Cited (Backward Citations)
No citation records indexed.
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