Process for producing fibers, filaments and webs by melt spinnin

Details Process for producing fibers, filaments and webs by melt spinnin Process for producing fibers, filaments and webs by melt spinnin

1997-05-22

1999-02-09

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642108, 26421112, B29C 4700, D01D 508, D01F 604

Patent

active

058689842

ABSTRACT:
Polyolefin molding composition consisting essentially of a polyolefin formed from an olefin having at least 3 carbon atoms of the formula R.sup.a --CH.dbd.CH--R.sup.b, where R.sup.a and R.sup.b are identical or different and each is hydrogen or C.sub.1 -C.sub.15 -alkyl, straight-chain or branched, or R.sup.a and R.sup.b together with the atoms joining them together form a ring system, and from 0 to 10% by weight of ethylene or of a second olefin have the abovementioned meaning as comonomer, characterized by a 230/2.16 MFI from 5 to 1000 g/10 min, a 230/5 MFI from 15 to 3000 g/10 min, a molecular weight (M.sub.w) from 75,000 to 350,000 g/mol, a polydispersity (M.sub.w /M.sub.n) from 1.8 to 3.5, a viscosity number from 70 to 300 cm.sup.3 /g, a melting point from 120.degree. to 165.degree. C., an isotactic block length from 25 to 150, and ether extractables less than 2% by weight, based on the total weight of the polymer.

REFERENCES:
patent: 3991244 (1976-11-01), Debbas
patent: 4086381 (1978-04-01), Cheshire
patent: 4384098 (1983-05-01), Hagler
patent: 4902462 (1990-02-01), Bert
patent: 5002815 (1991-03-01), Yamanaka
patent: 5017658 (1991-05-01), Noma
patent: 5145819 (1992-09-01), Winter et al.
patent: 5243001 (1993-09-01), Winter et al.

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