US3714296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polychloroprene elastomer
Assignee: Denka Co Ltd
•
Filing: 1968-08-19
•
Granted: 1973-01-30
•
Expires: 1988-08-19
Abstract
Abstract A polychloroprene elastomer prepared by blending a toluene insoluble gel polymer, obtained by polymerizing chloroprene or a mixture of chloroprene with at least one copolymerizable monomer, with a toluene soluble sol polymer obtained by polymerizing chloroprene or a mixture of chloroprene with at least one copolymerizable monomer, wherein the cross-linking density of the elastomer is at least 2.4 X 10 6.
Inventors
- 👤 C Kitagawa
- 👤 I Fukuoka
- 👤 T Nishimura
- 👤 K Hanabusa
- 👤 T Kadowaki
- 👤 S Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:55
CPC Classifications
C; C08; C08L; C08L11/00; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08L2205/00; C08L2205/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
A polychloroprene elastomer consisting of a blend of from 20 to 80 parts by weight of (a) a toluene-insoluble gel polymer, having a crosslinking density of at least 2.4 X 10 6 obtained by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer to a monomer conversion of at least 80 percent in the presence of a cross-linking agent selected from the group consisting of a compound represented by the formula; wherein n is an integer of from 2 to 4, divinylbenzene and diallyl phthalate, and from 80 to 20 parts by weight of (b) a toluene-soluble sol polymer obtained by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer.
Claim 2
Dependent Claim
126 words
A polychloroprene elastomer consisting of a blend of from 20 to 80 parts by weight of (a) a toluene-insoluble gel polymer, having a crosslinking density of at least 2.4 X 10 6 obtained by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer to a monomer conversion of at least 80 percent in the presence of a cross-linking agent selected from the group consisting of a compound represented by the formula; wherein n is an integer of from 2 to 4, divinylbenzene and diallyl phthalate, and from 80 to 20 parts by weight of (b) a toluene-soluble sol polymer obtained by polymerizing chloroprene or a mixture of chloroprene with a small amount of at least one copolymerizable monomer.
Claim 3
Dependent Claim
18 words
An elastomer as in claim 1, wherein the cross-linking agent is diethylene glycol dimethacrylate or tetraethylene glycol dimethacrylate.
Claim 4
Dependent Claim
39 words
An elastomer as in claim 1 in which the monomer copolymerizable with chloroprene is one 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 5
Dependent Claim
15 words
An elastomer as in claim 1 in which the monomer copolymerizable with chloroprene is styrene.
Claim 6
Dependent Claim
15 words
An elastomer as in claim 1 in which the monomer copolymerizable with chloroprene is 2,3-dichlorobutadiene-1,3.
Claim 7
Dependent Claim
23 words
The polychloroprene elastomer of claim 1 wherein the weight ratio of said gel polymer to said soL polymer varies from 50:50 to 54:46.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |