Process for elastomer viscosity stabilization

Details Process for elastomer viscosity stabilization Process for elastomer viscosity stabilization

C - Chemistry, Metallurgy

08

K

400/1119, 400/49

C08K 5/00 (2006.01) C08K 5/04 (2006.01) C08K 5/20 (2006.01) C08K 5/3415 (2006.01) C08L 9/00 (2006.01) C08L 11/00 (2006.01)

Patent

CA 1116779

ABSTRACT OF THE DISCLOSURE 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 chloropene polymers with hydrocarbon diene elastomers can be similarly stabilized.

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