The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 1990
Filed:
Oct. 30, 1986
Balbhadra Das, Allison Park, PA (US);
Narasimhan Raghupathi, Murrysville, PA (US);
Thomas V Thimons, Allison Park, PA (US);
Azdel, Inc., Shelby, NC (US);
Abstract
Fiber reinforced thermoplastic parts having good surface characteristics are produced by a process involving: preheating fiber reinforced composite to achieve at least a flowable viscosity of the polymer, and (2) molding under controlled rheological conditions. The preheating is conducted on composites that are predominantly amorphous thermoplastic polymers, copolymers, polyblends or alloys reinforced with continuous glass fiber strand reinforcing mat. The amount of the mat present in the laminate is less than around 40 weight percent of the composite. The temperature of preheating is at least greater than the glass transition temperature of the polymer and less than the degradation temperature of the polymer to expand the composite. The preheated composites are compression molded in an effective charge and at a pressure of at least around 500 to 6,000 psi, where at least one die surface of the mold is maintained at a temperature in the range of the glass transition temperature of the polymer to a temperature of 70.degree. F. (39.degree. C.) below the glass transition temperature of the polymer.