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US 3,962,154 AGranted
Method for producing an improved molded thermoplastic article
AssigneeThe Standard Oil Company
InventorErnst A. Egli
Life of this patent
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Abstract
A method for producing an improved molded thermoplastic polymeric resinous article comprising: introducing a heat plastified thermoplastic polymeric resinous material into a mold in the presence of a finely divided inorganic material; cooling said heat plastified thermoplastic polymeric resinous material; removing from said mold said cooled mold shaped thermoplastic polymeric resinous material having finely divided inorganic material incorporated therein.
Claims5
A foamed thermoplastic polymeric resinous article substantially free of swirl-patterns in its surface comprising:
- a thermoplastic polymeric resinous material selected from the group consisting of polystyrene, polypropylene, and polyethylene having a finely divided inorganic material comprising about 30% zinc sulfide and about 70% barium sulfate intimately associated therewith in a range between about 0.001% and about 50% based upon the total weight of the thermoplastic polymeric resin and the inorganic material.
Dependencies are inferred from the claim text.