Process for curing liquid chloroprene polymer containing xanthat

Details Process for curing liquid chloroprene polymer containing xanthat Process for curing liquid chloroprene polymer containing xanthat

1975-07-17

1977-10-18

Lilling, Herbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 17, 526 49, 526 50, 526 77, 526204, 526217, 526223, 526294, 526295, C08F 200, C08F 1402, C08F 3400, C08F 400

Patent

active

040547310

ABSTRACT:
A process for preparing a chloroprene-based liquid polymer having active terminal groups substantially at the terminals thereof comprising polymerizing chloroprene alone or in combination with one or more monomers copolymerizable with chloroprene in (1) an organic solvent having a boiling point of about 160.degree. C or less at atmospheric pressure and selected from the group consisting of aromatic hydrocarbons, aliphatic halogenated hydrocarbons and cyclic ethers, or (2) in carbon disulfide, which is present in an amount of about 20 to 200 parts by weight per 100 parts by weight of the total monomer, in the presence of a xanthogen disulfide compound represented by the formula: ##STR1## wherein R can contain from 1 to 12 carbon atoms and is an alkyl group, an aryl group, an aralkyl group or a cycloaliphatic group, which is present in an amount substantially equal to a ratio of about 2.5 to 20 parts by weight of diethyl xanthogen disulfide per 100 parts by weight of the total monomer. The chloroprene-based liquid polymer is purified by contacting the polymer or the polymer containing solution with an alcohol represented by the formula:

REFERENCES:
patent: 3300433 (1967-01-01), Apotheker
patent: 3472828 (1969-10-01), Montgomery
patent: 3686156 (1972-08-01), Hagman
patent: 3755261 (1973-08-01), Van Gulick
patent: 3891606 (1975-06-01), Fogon
patent: 3919281 (1974-05-01), Marubashi et al.

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