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. 07, 1989
Filed:
Mar. 30, 1988
Kureha Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A highly crystallized, molded product of a polyarylene thioether resin, which has little dimensional deformation and wavy wrinkles, is high in heat-resistance and transparency and is tough and is obtained by the process comprising the steps of stretching a molded product mainly consisting of polyarylene thioether of the crystallization degree of not more than 15% in at least one direction at a stretching ratio of 2 to 5 times, making an organic solvent having a solubility parameter of 8 to 12, contacting the solvent with the stretched, molded product at a temperature in the range of from the solidifying point of the solvent to 130.degree. C., thereby preliminarily crystallizing the stretched, molded product until the increased portion of the crystallization degree becomes not less than 6% and then thermally treating preliminarily crystallized product at 140.degree. to 300.degree. C. until the crystallization degree reaches not less than 22%.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile