Partially cross-linkable compositions and process for preparing

Details Partially cross-linkable compositions and process for preparing Partially cross-linkable compositions and process for preparing

1980-12-31

1983-01-11

Kight, III, John

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523221, 524515, 525240, C08L 2326

Patent

active

043682804

ABSTRACT:
A composition essentially consisting of a monoolefin copolymer rubber such as an ethylene-propylene copolymer rubber and a polyolefin resin such as polypropylene is granulated and then suspended, by stirring, in water containing a suspending agent. Then, a cross-linking agent is dispersed in the resulting suspension and introduced into the granules at a temperature lower than the decomposition temperature of the cross-linking agent to obtain a granular composition uniformly impregnated with the cross-linking agent. This composition is used as such or as a masterbatch to prepare partially cross-linked thermoplastic elastomers. Such compositions having a cross-linking agent content of not greater than 5% by weight based on the amount of the rubber component can be converted into partially cross-linked thermoplastic elastomers having a uniform degree of cross-linking, simply by heating the impregnated granules statically to effect the cross-linking reaction.

REFERENCES:
patent: 4239862 (1980-12-01), Mattews et al.
patent: 4243566 (1981-01-01), Burke, Jr.
patent: 4247652 (1981-01-01), Matsuda et al.
patent: 4252969 (1981-02-01), Broering et al.

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