Process for manufacturing plastic microspheres

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United States of America Patent

PATENT NO 5525274
SERIAL NO

08267252

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Spherical particles having a diameter between 0.007' and 0.040' are formed from melt extruded thermoplastic material suitable for casting on a heated mold surface and melting thereon to form a thin layer of material having a nominal thickness of 0.040' that is cooled and removed from the mold surface as a part having a porosity less than a visually observable threshold. The process includes the steps of providing microspheres formed of blended and melt extruded thermoplastic, plasticizers (if necessary) and pigment additives that constitute less than 5% by weight of the blend and shaped as a smooth round spherical particle. The microspheres may then be distributed as predetermined charge of such microspheres against the heated casting surface to melt the microspheres as a layer of thermoplastic material having a porosity less than 0.003 inches and thereafter cooling and removing the non-porous layer from the casting surface.

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Patent Owner(s)

Patent OwnerAddress
BAYER MATERIALSCIENCE LLC100 BAYER ROAD PITTSBURGH PA 15205-9741

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Grimmer, Robert A Berwick, ME 13 173

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