Morphology stabilization of heterogeneous blends

Details Morphology stabilization of heterogeneous blends Morphology stabilization of heterogeneous blends

C - Chemistry, Metallurgy

25

D

204/91.14

C25D 13/06 (2006.01) B29C 71/04 (2006.01) C08L 21/00 (2006.01) B29C 35/08 (2006.01)

Patent

CA 1098863

MORPHOLOGY STABILIZATION OF HETEROGENEOUS POLYMER BLENDS ABSTRACT OF THE DISCLOSURE A heterogeneous blend of elastomers having a stabilized morphology, as well as the method of making the same, comprises at least two radiation cross-linkable elastomers which form a heterogeneous blend. The radiation cross-linkable elastomer components are selected from the class consisting of conjugated dienes having from 4 to 12 carbon atoms, natural rubber, poly- alkenamers such as polypentenamer, chlorinated polyolefinic elastomers having from 2 to 8 carbon atoms such as chlorinated polyethylene, ethylene- propylene terpolymers, polysiloxanes, nitrile rubber, butadiene-acrylic copolymers, chlorosulfonated polyethylene, butadiene vinyl pyridine co- polymers, substituted phosphazenes, aliphatic polyesters which are substan- tially non-crystalline and have 6 carbon atoms or more in the repeating unit, preferably from 6 to 12 carbon atoms, butyl copolymers containing groups with unsaturation, a butadiene-styrene copolymer and a copolymer, terpoly- mer, etc., made from a conjugated diene having from 4 to 12 carbon atoms and from monomers selected from the class consisting of a vinyl aromatic having from 8 to 15 carbon atoms, acrylonitrile, and olefins having from 2 to 8 carbon atoms. The morphology of the heterogeneous blend is greatly im- proved or fully stabilized by irradiating to a point below to slightly above the gel dose of the blend, that is to a point where the blend has 15 percent and preferably near or less than 5 percent gel. The greatly improved or fully stabilized morphology permits conventional processing steps to be carried out wherein shear is involved such as in milling, extruding, com- pression or injection molding, and the like such that the final morphology of the blend, after processing, is substantially the same as the initial morphology. Examples of specific heterogeneous elastomeric blends include nitrile rubber blended with an EPDM polymer, styrene-butadiene blended with an EPDM polymer, and polybutadiene blended with an EPDM polymer.

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