Claims
- 1. A process for the preparation of a polychloroprene polymer, comprising polymerizing chloroprene in alkaline aqueous emulsion, in the presence of a free-radical initiator and a combination chain-transfer agent, said combination chain-transfer agent comprising an effective amount of (1) at least one xanthogen disulfide and (2) at least one bis(acylaminophenyl)-polysulfide for forming a polychloroprene polymer, said polymerization being carried out without elemental sulfur and wherein the at least one xanthogen disulfide has a formula according to Formula (I) and the at least one bis(acylaminophenyl)-polysulfide has a formula according to Formula (II): ##STR3## wherein R and R', which may be identical or different, are each alkyl radicals having from 1 to 8 carbon atoms; R.sub.1 and R.sub.2, which may be identical or different, are each a linear or branched chain alkyl radical, an aryl radical or an arylalkyl radical, R.sub.3 and R.sub.4 which are identical or different, are each hydrogen, a methyl radical, or ethyl radical; and x ranges from 2 to 4.
- 2. The process as defined by claim 1, said combination chain-transfer agent comprising (2) at least one benzanilide disulfide.
- 3. The process as defined by claim 1, said combination chain-transfer agent comprising (2) at least one bis(2-benzamidophenyl)polysulfide.
- 4. The process as defined by claim 1, wherein the amount of said at least one xanthogen disulfide (1) ranges from 0.01 to 0.8 parts by weight, expressed as diisopropylxanthogen disulfide, per 100 parts by weight of polymerizable monomer.
- 5. The process as defined by claim 4, said amount of said at least one xanthogen disulfide ranging from 0.07 to 0.50 parts by weight, per 100 parts by weight of polymerizable monomer.
- 6. The process as defined by claim 4, wherein the amount of said at least one bis(acylaminophenyl)polysulfide (2) ranges from 0.01 to 1.3 parts by weight, expressed as benzanilide disulfide, per 100 parts by weight of polymerizable monomer.
- 7. The process as defined by claim 6, said amount of said at least one bis(acylaminophenyl)polysulfide ranging from 0.20 to 0.75 parts by weight, per 100 parts by weight of polymerizable monomer.
- 8. The process as defined by claim 6, wherein the total amount of said at least one xanthogen disulfide (1) and said at least one bis(acylaminophenyl)polysulfide (2) ranges from 0.2 to 1 part by weight, per 100 parts by weight of polymerizable monomer.
- 9. The process as defined by claim 1, comprising homopolymerizing chloroprene monomer.
- 10. The process as defined by claim 1, comprising copolymerizing chloroprene with up to 30% by weight of an ethylenically unsaturated comonomer copolymerizable therewith.
Priority Claims (1)
Number |
Date |
Country |
Kind |
88/04657 |
Apr 1988 |
FRX |
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CROSS-REFERENCE TO RELATED APPLICATIONS
The present application is a continuation of application Ser. No. 07/899,129, filed Jun. 16, 1992, abandoned; which is a continuation of application Ser. No. 07/622,142, filed Dec. 4, 1990, now abandoned; which is a continuation of application Ser. No. 07/334,713, filed Apr. 7, 1989, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
963075 |
Jul 1964 |
GBX |
Continuations (3)
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Number |
Date |
Country |
Parent |
899129 |
Jun 1992 |
|
Parent |
622142 |
Dec 1990 |
|
Parent |
334713 |
Apr 1989 |
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