Process for elastomer viscosity stabilization

Details Process for elastomer viscosity stabilization Process for elastomer viscosity stabilization

1978-04-24

1979-05-15

Hoke, V. P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 457R, 260 4585V, 260 458N, 260 459NC, 260782, 260784, 260800, 260810, C08K 520, C08K 511, C08K 507

Patent

active

041547071

ABSTRACT:
The viscosity of chloroprene polymers is stabilized by addition to the polymer of 0.1-5 weight % of an ester, amide, or amic acid derived from maleic acid or fumaric acid or a diacylethylene compound or from their halogenated derivatives. Stabilization of chloroprene polymers made in the absence of elemental sulfur allows them to be mixed under high temperature/high shear conditions, without undergoing substantial crosslinking for practical periods. Sulfur-modified chloroprene polymers are stabilized against viscosity increases during ambient temperature aging. Blends of either type of chloroprene polymers with hydrocarbon diene elastomers can be similarly stabilized.

REFERENCES:
patent: 2313757 (1943-03-01), Matheson et al.
patent: 2392756 (1946-01-01), Mighton
patent: 2885319 (1959-05-01), Ligett et al.
patent: 3153014 (1964-10-01), Fletcher et al.
patent: 3240750 (1966-03-01), Bonvicini
patent: 3506624 (1970-04-01), Behrens

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