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:
Feb. 16, 1982
Filed:
Dec. 10, 1979
Takayoshi Nakajima, Moriyamashi, JP;
Susumu Tomioka, Shigaken, JP;
Chisso Corporation, Osaka, JP;
Abstract
A process for producing side-by-side type composite fibers made of polypropylene-polyethylene which do not have hardly any crimp nor latent crimpability is provided. In said process, a composite spinning is carried out by melt-extrusion by using, as composite components of side by side type, crystalline polypropylene of an intrinsic viscosity (I.V.) of 1.45.about.2.15 and high density polyethylene of I.V. of 0.85.about.1.05 under a condition satisfying the relationship of 10,500.gtoreq.DX V.gtoreq.5,139 (V: take-up speed (m/min); D: denier of taken up unstretched fibers); and stretching the resulting filaments to 3.about.5 times the original length at a temperature of 90.degree. C. or higher.