Uvtec, Inc.

Spartech Corporation

Impact Extrusions, Inc.

George D Howell

Kenneth W Bartz

David J Cherry

R Michael Mahan

Irvin E Hurt

A pellet is formed by a method includes, in one embodiment, dispersing up to about 95% by weight of thermoset rubber particles into a carrier resin to form the plastic compound. The carrier resin includes an olefin block copolymer. The method also includes the steps of extruding the plastic compound through a die having at least one die hole to form at least one extrudate filament, cutting the at least one extrudate filament to a predetermined length to form a plurality of pellets, conveying the pellets to a separator/centrifugal dryer in water having a temperature of about 170&#xb0; F. or greater, and separating the pellets from the water in the separator/centrifugal dryer so that the pellets are substantially dry upon removal from the separator/centrifugal dryer. The resultant pelletized plastic compound has a flex modulus of less than about 20,000 pounds per square inch (psi).

Pelletized plastic compounds and method of manufacture

A high gloss, impact resistant material is made by coextruding a cap layer of a metallocene polyethylene and clarified random copolymer polypropylene onto a core layer. The coextrusion process is guided by a dual manifold die which reduces the interfacial instability of the melt streams as the cap layer is being applied. When thermoformed, the material retains its gloss and exhibits excellent low temperature impact resistance.

High gloss high impact TPO coextrusion and method of making

A flame-retardant, reinforced polyolefin-crosslinked acrylic bonded composite and method of preparation thereof are provided. The method of preparing the composite includes coating the crosslinked acrylic surface with a solution of an .gamma.-aminopropyltrialkoxysilane to form a bond therewith. The coated acrylic layer is placed in a heated press with the flame-retardant, reinforced polyolefin layer, and a tie material disposed therebetween, thereby forming a composite. The composite is compressed to allow the amino functional group to bond with the maleated polyolefin. The polyolefin is thus bonded to the crosslinked acrylic surface.

Polyolefin-acrylic bonded composite

A flame-retardant, reinforced polyolefin-crosslinked acrylic bonded composite and method of preparation thereof are provided. The method of preparing the composite includes coating the crosslinked acrylic surface with an aqueous solution of an .gamma.-aminopropyltrialkoxysilane to form a bond therewith. The coated acrylic layer is placed in a heated press with the flame-retardant, reinforced polyolefin layer, and a tie material disposed therebetween, thereby forming a composite. The composite is compressed to allow the amino functional group to bond with the maleated polyolefin. The polyolefin is thus bonded to the crosslinked acrylic surface.

Polyolefin-acrylic bonded composites

A composite sheet material especially suited as a roofing material is disclosed. The sheet is a composite of extruded top and bottom layers. The top layer is formed by extrusion of a mixture of cured rubber particles dispersed in a matrix of polypropylene. The bottom layer is formed by coextrusion with the top layer of a mixture of calcium carbonate and cured rubber particles dispersed in a matrix of polypropylene. The method of fabricating the composite sheet material includes trimming longitudinal edges of the material with powered circular blades as it moves between chill rollers and a pull roller assembly. The material is spooled with minimum winding tension so as to prevent tension forces from being set in the material.

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Arlington, TX, United States of America

George D Howell