Method for making free-flowing coated rubber pellets

Details Method for making free-flowing coated rubber pellets Method for making free-flowing coated rubber pellets

1986-11-10

1989-04-18

Ziegler, Jacob

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

To form particulate product

428407, 525210, 525240, B29B 906

Patent

active

048225452

ABSTRACT:
Free flowing coated pellets are prepared by blending a first polymer with a second polymer wherein the second polymer is a polymer which has a crystalline or semicrystalline melting point which is at least 10.degree. C. above the melting or softening point of the first polymer, the two polymers being insoluble in one another in the melt state; (2) intimately blending the two polymers; and (3) extruding the blend through a die having an outlet die face which is maintained at a substantially lower temperature than the extruder melt temperature.
In its preferred embodiment the first polymer is an elastomer and the second polymer comprises at least one crystalline or semi-crystalline plastic polymer. A typical composition comprises an EMP or EPDM rubber and a mixture of polyethylene and a crystalline copolymer of ethylene and propylene.

REFERENCES:
patent: 3949039 (1976-04-01), Yamamoto et al.
patent: 4454092 (1984-06-01), Shimizu et al.

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