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:
Mar. 17, 1992
Filed:
Sep. 14, 1990
Shigeru Nedzu, Shizuoka, JP;
Polyplastics Co., Ltd., Osaka, JP;
Abstract
A process of producing a transparent resin film includes inflation molding in an upward direction a resin composition which having 100 parts by weight of a polybutylene terephthalate resin having an intrinsic viscosity IV.sub.a of at least 1.0, and between 15 to 45 parts by weight of a polycarbonate resin having an intrinsic viscosity IV.sub.b of at least 0.4. The polybutylene terephthalate and polycarbonate resins are present such that the ratio .eta..sub.A /.eta..sub.B is between 0.35 to 1.5, wherein .eta..sub.A is the melt viscosity of the polybutylene terephthalate resin at a shear rate of 100.sup.-1 at 260.degree. C., and .eta..sub.B is the melt viscosity of the polycarbonate resin at a shear rate of 100.sup.-1 at 260.degree. C. During inflation molding, the resin composition is extruded at an extrusion temperature T(.degree.C.) which satisfies the equation:
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile