Production of sulfur-modified solid chloroprene rubbers

Details Production of sulfur-modified solid chloroprene rubbers Production of sulfur-modified solid chloroprene rubbers

1983-03-09

1984-11-13

Henderson, Christopher A.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

526 65, 526294, 526295, C08L 1102

Patent

active

044826761

ABSTRACT:
Vulcanizable, elastomeric chloroprene/sulfur copolymers having viscosities of from 60 to 35 ME, strengths of greater than 20 MPa and sulfur contents of from about 0.3 to 0.45% by weight are obtained by polymerizing chloroprene in the presence of from 0.05 to 0.40% by weight of sulfur to form a latex I, polymerizing chloroprene in the presence of from 0.5 to 1.5% by weight of sulfur to form a latex II, mixing latices I and II, optionally together with other sulfur-modified polychloroprene latices, in a ratio of from 4:1 to 1:4 (based in each case on solids) and peptizing the mixture, followed by working up to form the solid rubber, the percentages quoted being based on the quantity of monomer.

REFERENCES:
patent: 3079359 (1963-02-01), Stierli
patent: 3752785 (1973-08-01), Smith
Catton, N. L., Neoprenes, E. I. Du Pont Co., 1953, pp. 201-203.

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