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:
Sep. 04, 1984
Filed:
Jul. 27, 1982
Chisso Corporation, Osaka, JP;
Abstract
A process for producing a highly bulky nonwoven fabric is provided, which process comprises melt-spinning a crystalline propylene polymer as a first component and an ethylene polymer as a second component, into side-by-side or sheath-core type composite fibers so that the first component after melt-spinning can have a specified M.sub.w /M.sub.n value; collecting the fibers into a continuous tow form; stretching the tow in a specified stretch ratio; cooling the stretched tow to a specified temperature and then drawing it by a pair of nip rolls, one or both of which are of a non-metal, to obtain heat-adhesive composite fibers having apparent crimps of a specified number, a specified percentage crimp modulus and substantially no latent crimpability; and heat-treating a web consisting of the fibers alone or a blend thereof with other fibers at a specified temperature.