Polymer filament

Patent metadata

Field	Value
Publication number	US-9828699-B2
Application number	US-201013496457-A
Country	US
Kind code	B2
Filing date	Sep 13, 2010
Priority date	Sep 21, 2009
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A polymer filament comprising a polyolefin composition which comprises at least 10% by weight of one or more copolymer(s) (I) of propylene with one or more comonomers selected from ethylene, C 4 -C 10 α-olefins and their combinations, said copolymer or copolymers (I) having MFR from 0.5 to 10 g/10 min. and containing units deriving from the said comonomers in a total amount of from 0.5 to 25% by weight with respect to the total amount of all momoner units in the copolymer, provided that, in the absence of comonomer units deriving from C 6 -C 10 α-olefins, the amount of comonomer units deriving from ethylene or C 4 -C 5 α-olefins or their combinations is at least 2.5% by weight.

First claim

What is claimed is:

1. A polymer filament comprising a polyolefin composition, wherein the polyolefin composition comprises:
(A) 55-95 wt. % by weight, based upon the total weight of the polyolefin composition, of a copolymer (I) of propylene with at least one comonomer selected from ethylene and C 4 -C 10 α-olefins and their combinations, said copolymer (I) having an MFR of 0.5-10 g/10 min., having a polymer fraction insoluble in xylene at room temperature of 60-90% by weight, a melting temperature equal to or greater than 120° C., and comprising units deriving from the said comonomers in a total amount of 0.5-25% by weight with respect to the total amount of all monomer units in the copolymer, provided that, in the absence of comonomer units deriving from C 6 -C 10 α-olefins, the amount of comonomer units deriving from ethylene or C 4 -C 5 α-olefins or their combinations is at least 2.5% by weight; and
B) 5-45 wt. % by weight, based upon the total weight of the polyolefin composition, of a polyolefin composition having a flexural modulus equal to or less than 200 MPa, and wherein component B) is a heterophasic polyolefin composition comprising:
(i) a crystalline propylene homopolymer, copolymer of propylene or combinations thereof, wherein the copolymer of propylene contains up to 10% by weight of ethylene and/or an α-olefin comonomer, and
(ii) a copolymer of ethylene and an α-olefin, wherein the copolymer of ethylene and an α-olefin, optionally, contains a diene, and wherein the copolymer of ethylene and an α-olefin contains 15% or more, based upon the total weight of the copolymer of ethylene and an α-olefin, of ethylene;

wherein the polymer filament has an elongation at break as measured by ASTM D882-02 at conditions of 25° C. and 500 mm/min of from 73% to 165%.

2. The polymer filament of claim 1 , having a titre of at least 20 dTex.

3. The polymer filament of claim 1 , stretched by drawing with a draw ratio from 1.5 to 10.

4. The polymer filament of claim 1 , wherein component B) has at least one of the following features:
Shore D hardness of at most 50 points;
Shore A hardness of at most 90 points; and
X-ray crystallinity from 0 to 40%.

5. The polymer filament of claim 1 , wherein the copolymer of ethylene and an α-olefin contains 10 to 40% by weight, of the α-olefin.

6. The polymer filament of claim 5 , wherein the α-olefin is a C 3 -C 10 α-olefin.

7. A manufactured item containing the polymer filaments of claim 1 .

8. An artificial turf structure, comprising a plurality of polymer filaments according to claim 1 .

Assignees

• De Palo Roberto
• Vanzini Roberto
• Perdomi Gianni
• Felisati Andrea
• Basell Poliolefine Italia Srl

Inventors

• De Palo Roberto
• Vanzini Roberto
• Perdomi Gianni
• Felisati Andrea

Classifications

• D01F6/46 Primary

  of polyolefins · CPC title

• D06N7/0065

  characterised by the pile · CPC title

• E01C13/08

  Surfaces simulating grass {; Grass-grown sports grounds (grass-like surfaces for skiing E01C13/12)} · CPC title

• D01D5/42

  by cutting films into narrow ribbons or filaments or by fibrillation of films {or filaments} · CPC title