US3876732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polychloroprene elastomer
Assignee: Denka Co Ltd
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Filing: 1972-09-18
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Granted: 1975-04-08
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Expires: 1992-09-18
Abstract
Abstract A process is disclosed for preparing a polychloroprene elastomer consisting of a blend of from 20 to 80 parts by weight of (a) a toluene-insoluble gel polymer and from 80 to 20 parts by weight of (b) a toluene-soluble sol polymer, the process comprising preparing the toluene-insoluble gel polymer by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer in the presence of a suitable cross-linking agent, preparing the toluene-soluble sol polymer by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer and blending the gel and sol polymers wherein an improved elastomer is obtained by polymerizing the toluene-insoluble gel polymer to a cross-linking density of at least 2.4 .times. 10.sup.-.sup.6 to a monomer conversion of at least 80%.
Inventors
- 👤 Chojiro Kitagawa
- 👤 Ichiro Fukuoka
- 👤 Takashi Kadowaki
- 👤 Shoji Kimura
- 👤 Takehiko Nishimura
- 👤 Kanehisa Hanabusa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:40
CPC Classifications
C; C08; C08L; C08L11/00; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08L2205/00; C08L2205/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
167 words
IN A PROCESS FOR PREPARING A POLYCHLOROPRENE ELASTOMER CONSISTING OF A BLEND OF FROM 20 TO 80 PARTS BY WEIGHT OF (A) A TOLUENE-INSOLUBLE GEL POLYMER AND FROM 80 TO 20 PARTS BY WEIGHT OF (B) A TOLUENE-SOLUBLE SOL POLYMER COMPRISNG PREPARING SAID TOLUENE:INSOLUBLE GEL POLYMER BY POLYMERIzING CHLOROPRENE OR A MIXTURE OF CHLOROPRENE WITH A SMALL AMOUNT OF AT LEAST ONE COPOLYMERIZABLE MONOMER IN THE PRESENCE OF A CROSS-LINKING AGENT SELECTED FROM THE GROUP PRESENCE OF COMPOUND REPRESENTED BY THE FOLLOWING FORMULA: CH2=C(-CH3)-COO-(CH2)N-OOC-C(-CH3)=CH2 WHEREIN N IS AN INTEGER OF FROM 1 TO 8, CH2=C(-CH3)-COO-(CH2-CH2-O)N-CO-C(-CH3)=CH2 WHEREIN N IS AN INTEGER OF FROM 2 TO 4, DIVINYLBENZENE AND DIALLYL PHTHALATE, PREPARING SAID TOLUENE-SOLUBLE SOLL POLYMER BY POLYMERIZING CHLOROPRENE OR A MIXTURE OF CHLOROPRENE WITH A SMALL AMOUNT OF AT LEAST ONE COPOLYMERIZABLE MONOMER, AND BLENDING SAID TOLUENE-INSOLUBLE GEL POLYMER AND SAID TOLUENESOLUBLE SOL POLYMER, THE IMPROVEMENT COMPRISING POLYMERIZING SAID TOLUENE-INSOLUBLE GEL POLYMER TO A CROSS-LINKING DENSITY OF AT LEAST 2,4X10**-6 AND A MONOMER CONVERSION OF A LEAST 80%.
Claim 2
Dependent Claim
167 words
IN A PROCESS FOR PREPARING A POLYCHLOROPRENE ELASTOMER CONSISTING OF A BLEND OF FROM 20 TO 80 PARTS BY WEIGHT OF (A) A TOLUENE-INSOLUBLE GEL POLYMER AND FROM 80 TO 20 PARTS BY WEIGHT OF (B) A TOLUENE-SOLUBLE SOL POLYMER COMPRISNG PREPARING SAID TOLUENE:INSOLUBLE GEL POLYMER BY POLYMERIzING CHLOROPRENE OR A MIXTURE OF CHLOROPRENE WITH A SMALL AMOUNT OF AT LEAST ONE COPOLYMERIZABLE MONOMER IN THE PRESENCE OF A CROSS-LINKING AGENT SELECTED FROM THE GROUP PRESENCE OF COMPOUND REPRESENTED BY THE FOLLOWING FORMULA: CH2=C(-CH3)-COO-(CH2)N-OOC-C(-CH3)=CH2 WHEREIN N IS AN INTEGER OF FROM 1 TO 8, CH2=C(-CH3)-COO-(CH2-CH2-O)N-CO-C(-CH3)=CH2 WHEREIN N IS AN INTEGER OF FROM 2 TO 4, DIVINYLBENZENE AND DIALLYL PHTHALATE, PREPARING SAID TOLUENE-SOLUBLE SOLL POLYMER BY POLYMERIZING CHLOROPRENE OR A MIXTURE OF CHLOROPRENE WITH A SMALL AMOUNT OF AT LEAST ONE COPOLYMERIZABLE MONOMER, AND BLENDING SAID TOLUENE-INSOLUBLE GEL POLYMER AND SAID TOLUENESOLUBLE SOL POLYMER, THE IMPROVEMENT COMPRISING POLYMERIZING SAID TOLUENE-INSOLUBLE GEL POLYMER TO A CROSS-LINKING DENSITY OF AT LEAST 2,4X10**-6 AND A MONOMER CONVERSION OF A LEAST 80%.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein said thiophosphoric acid has the formula:
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the cross-linking agent is ethylene glycol dimethacrylate, tetramethylene glycol dimethacrylate, diethylene glycol dimethacrylate or tetraethylene glycol dimethacrylate.
Claim 5
Dependent Claim
38 words
The process of claim 1 wherein the monomer copolymerizable with chloroprene is a monomer selected from the group consisting of styrene, vinyltoluene, butadiene, isoprene, 2,3-dichlorobutadiene-1,3, methyl vinyl ketone, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate and acrylonitrile.
Claim 6
Dependent Claim
20 words
A process according to claim 2, wherein said alkyl groups of said alkyl phenyl are C.sub.7 to C.sub.9 alkyl groups.
Claim 7
Dependent Claim
46 words
A process according to claim 2, wherein said thiophosphoric acid and hydrogen peroxide are introduced into the reactor under conditions so that there is always during the reaction 2 to 30 mole % excess of the hydrogen peroxide in the reactor relative to the dithiophosphoric acid.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the monomer copolymerizable with chloroprene is styrene.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein the monomer copolymerizable with chloroprene is 2,3-dichlorobutadiene-1,3.
Claim 10
Dependent Claim
42 words
A process according to claim 4 which is carried out in the presence of a non-polar diluent, wherein the reaction temperature is not allowed to rise above 60.degree. C., and wherein said aqueous solution contains 5 to 50 wt. % hydrogen peroxide.
Claim 11
Dependent Claim
22 words
The process of claim 1 wherein the weight ratio of said gel polymer to said sol polymer varies from 50:50 to 54:46.
Claim 12
Dependent Claim
20 words
A process according to claim 4 wherein the thiophosphoric acid is slowly added to hydrogen peroxide already in the reactor.
Claim 13
Dependent Claim
19 words
A process according to claim 4 wherein the thiophosphoric acid and hydrogen peroxide are simultaneously added to the reactor.
Claim 14
Dependent Claim
21 words
The process of claim 1 wherein the Mooney viscosity (ML.sub.1.sub.+ 4) at 100.degree.C. of the blend varies from 30 to 70.
Claim 15
Dependent Claim
84 words
In a process for preparing a polychloroprene elastomer consisting of a blend of from 20 to 80 parts by weight of (a) a toluene-insoluble gel polymer and from 80 to 20 parts by weight of (b) a toluene-soluble sol polymer comprising preparing said toluene-insoluble gel polymer by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer in the presence of a cross-linking agent selected from the group consisting of a compound represented by the following formula:
Claim 16
Dependent Claim
84 words
In a process for preparing a polychloroprene elastomer consisting of a blend of from 20 to 80 parts by weight of (a) a toluene-insoluble gel polymer and from 80 to 20 parts by weight of (b) a toluene-soluble sol polymer comprising preparing said toluene-insoluble gel polymer by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer in the presence of a cross-linking agent selected from the group consisting of a compound represented by the following formula:
Claim 17
Dependent Claim
84 words
In a process for preparing a polychloroprene elastomer consisting of a blend of from 20 to 80 parts by weight of (a) a toluene-insoluble gel polymer and from 80 to 20 parts by weight of (b) a toluene-soluble sol polymer comprising preparing said toluene-insoluble gel polymer by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer in the presence of a cross-linking agent selected from the group consisting of a compound represented by the following formula:
Claim 18
Dependent Claim
84 words
In a process for preparing a polychloroprene elastomer consisting of a blend of from 20 to 80 parts by weight of (a) a toluene-insoluble gel polymer and from 80 to 20 parts by weight of (b) a toluene-soluble sol polymer comprising preparing said toluene-insoluble gel polymer by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer in the presence of a cross-linking agent selected from the group consisting of a compound represented by the following formula:
References Cited (Backward Citations)
US3714296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |