Polyethylene fiber or filament

Patent metadata

Field	Value
Publication number	US-9605360-B2
Application number	US-201113643285-A
Country	US
Kind code	B2
Filing date	Apr 21, 2011
Priority date	Apr 30, 2010
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A polymer filament or fiber comprising a polyethylene material (I) having the following features:
a) a density of 0.900 g/cm 3 or higher; b) a MI 21 value of 25 g/10 min.; c) a MFR value from 25 to 60;

the said fiber being stretched by drawing with a draw ratio from 1.5 to 10.

First claim

The invention claimed is:

1. A polymer filament or fiber comprising:
A) 55-95% by weight of a polyethylene material
(I) having the following features:
a) a density of at least 0.900 g/cm3;
b) an MI 21 value of 25-50 g/10 min.;
c) an MFR value from 25-60;
d) an Mw/Mn value of 6-15; and
e) a titre of at least 20 dtex; wherein the filament or fiber is stretched by drawing with a draw ratio from 1.5 to 10 and comprises at least 0.5 vinyl groups/1000 carbon atoms;

and B) 5-45% by weight of an elastomeric or plastomeric polyolefin or polyolefin composition; wherein the amounts of A and B) refer to the total weight of the polyolefin component present in the filament or fiber.

2. The polymer filament or fiber of claim 1 , in a form of a monofilament or tape.

3. The polymer filament or fiber of claim 1 , wherein component B) has at least one of the following features:—a Flexural modulus (ISO 178A) of at most 200 MPa;—a Shore D hardness of at most 50 points; and—a Shore A hardness of at most 90 points; and—an X-ray crystallinity from 0 to 40%.

4. The polymer filament or fiber of claim 1 , wherein component B) is a heterophasic polyolefin composition comprising (i) at least one crystalline propylene homopolymer(s) or copolymer(s) of propylene with up to 10% by weight of at least one of ethylene and an a-olefin comonomer(s), or combinations of said homopolymers and copolymers, and (ii) a copolymer or a composition of copolymers of ethylene with other a-olefins and optionally with minor amounts of a diene, containing 15% or more of ethylene.

5. The polymer filament or fiber of claim 1 , wherein component B) is selected from: 1) butene-1 (co)polymers having:—a content of butene-1 derived units of at least 80% by weight;—a flexural modulus of at most 60 MPa; 2) propylene copolymers containing up to 40% by weight of an olefin comonomer having a Shore A hardness of at most 90 points; or 3) ethylene copolymers containing up to 45% by weight of an olefin comonomer and having a Shore A hardness of at most 90 points.

6. The polymer filament or fiber of claim 5 wherein component 2) the olefin comonomer is ethylene or a C 4 -C 10 alpha-olefin, and in component 3) the olefin comonomer is a C3-C 10 alpha-olefin.

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

8. An artificial turf structure comprising a plurality of the polymer filaments of claim 1 .

9. The polymer filament or fiber of claim 8 wherein component A) is present in an amount from 65%-85% by weight and component B) is present in an amount from 15-35% by weight.

10. The polymer filament or fiber of claim 1 wherein the MI 21 value is at least 30 g/10 min.

11. The polymer filament or fiber of claim 10 wherein the MI 21 value is at least 35 g/10 min.

12. The polymer filament of claim 1 , comprising a titre value of 50 dtex-1000 dtex.

Assignees

• Perdomi Gianni
• Fantinel Fabiana
• Vanzini Roberto
• Mihan Shahram
• De Palo Roberto
• Basell Polyolefine Gmbh

Inventors

• Perdomi Gianni
• Fantinel Fabiana
• Vanzini Roberto
• Mihan Shahram
• De Palo Roberto

Classifications

• C08L2207/02

  Heterophasic composition · CPC title

• C08F210/08

  Butenes · CPC title

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• C08L23/10

  Homopolymers or copolymers of propene · CPC title

• D01F6/30

  comprising olefins as the major constituent · CPC title