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. 05, 1985
Filed:
Apr. 19, 1983
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
In a process for producing an aromatic polyester fiber of high strength and high modulus of elasticity represented by the prescribed general formula, a process comprising grinding a polymer of the prescribed general formula to form ground particles having diameters of less than 3 mm and an average particle diameter of 0.5 mm or smaller; heat-treating the particles for 0.5 to 30 hr at a temperature between 100.degree. and 350.degree. C., at which temperature the particles do not fuse; melt-spinning the heat-treated particles at a temperature of 250.degree. to 450.degree. C. if the particles have a melt property such that the temperature at which the particles possess a shear rate of 51/sec (48,000 poise as melt viscosity) under a shear stress of 2.45.times.10.sup.6 dynes/cm.sup.2 is in the range of 200.degree. to 350.degree. C.; and thereafter heat-treating the resulting fiber for 0.5 to 50 hr at a temperature between 250.degree. and 450.degree. C., at which temperature the fiber does not fuse.