Claims
- 1. 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.times. 10.sup.-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 crosslinking agent represented by the following formula: ##STR3## wherein n is an integer of from 1 to 8, 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.
- 2. An elastomer as in claim 1, wherein the crosslinking agent is ethylene glycol dimethacrylate.
- 3. An elastomer as in claim 1, wherein the crosslinking agent is tetramethylene glycol dimethacrylate.
- 4. An elastomer as in claim 1, wherein the crosslinking agent is trimethylene glycol dimethacrylate.
- 5. 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-1,3methyl vinyl ketone, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate and acrylonitrile.
- 6. An elastomer as in claim 1 in which the monomer copolymerizable with chloroprene is styrene.
- 7. An elastomer as in claim 1 in which the monomer copolymerizable with chloroprene is 2,3-dichlorobutadiene-1,3.
- 8. 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.
- 9. The polychloroprene elastomer of claim 1 wherein the Mooney viscosity (ML.sub.1+4) at 100.degree. C. of the blend varies from 30 to 70.
Parent Case Info
This is a division of application Ser. No. 289,915, filed Sept. 18, 1972, now U.S. Pat. No. 3,876,732, in turn a division of Ser. No. 753,765, now U.S. Pat. No. 3,714,296.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3714296 |
Kitagawa et al. |
Jan 1973 |
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Divisions (2)
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Number |
Date |
Country |
Parent |
289915 |
Sep 1972 |
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Parent |
753765 |
Aug 1968 |
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