# US 7,611,652 B2 · Monoxially-oriented and annealed films with high cross machine toughness and related process

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- Number: US 7,611,652 B2
- Document ID: US7611652B2
- Status: Granted
- Kind: B2
- Application number: 11/446,039
- Filed: 2006-06-02
- Published: 2007-05-24
- Granted: 2009-11-03
- Earliest claimed: 2005-11-22
- Assignees: Shaw Industries Group, Inc.
- Inventors: Larry L. English; Jeffrey W. Adams
- Web page: https://patentgrep.com/patent/US7611652B2

## CPC

- D02G 3/06: Threads formed from strip material other than paper
- D03D 1/04: Sack- or bag-like articles
- D03D 9/00: Open-work fabrics
- D03D 15/283: synthetic polymer-based, e.g. polyamide or polyester fibres (cellulose-based artificial fibres D03D15/225)
- D03D 15/46: Flat yarns, e.g. tapes or films
- D10B 2321/021: polyethylene
- D10B 2321/022: polypropylene
- D10B 2503/041: Carpet backings
- D10B 2505/04: Filters
- D10B 2505/204: Geotextiles
- Y10T 428/23979: Particular backing structure or composition
- Y10T 428/2913: Rod, strand, filament or fiber
- Y10T 428/2973: Particular cross section
- Y10T 428/31: Surface property or characteristic of web, sheet or block
- Y10T 428/31909: Next to second addition polymer from unsaturated monomers
- Y10T 428/31913: Monoolefin polymer
- Y10T 442/30: Woven fabric [i.e., woven strand or strip material]
- Y10T 442/3065: Including strand which is of specific structural definition
- Y10T 442/3146: Strand material is composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D03D: WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A monoaxially-oriented polymeric film material formed from an impact copolymer and having increased toughness relative to films that are monoaxially-oriented at conventional temperatures. A process for imparting high cross machine toughness to polymer films comprises forming a film; subjecting the film to monoaxial orientation, drawing the film; tempering the film, and annealing the film.

## Claims

### Claim 1

A process for imparting high cross machine toughness to polymer film tape yarns, comprising:
forming a film from an impact copolymer:
subjecting said film to monoaxial orientation involving drawing at stages where said film is sequentially directed over a series of rollers as the film is sequentially subjected to a stage of preheating, then a stage of drawing and then a stage of tempering;
wherein said stage of tempering said film is conducted at temperatures of from between about 20 to about 45 percent lower than the temperature at which said film is subjected to during the stage of drawing;
annealing said film, wherein said film has an average cross machine toughness value of at least 3,000 lbs/in2 after the annealing step; and
slitting said film subsequent to said annealing.

### Claim 2 (depends on 1)

The process of claim 1, further comprising an olefin-based polymer blended with said impact copolymer.

### Claim 3 (depends on 2)

The process of claim 2, wherein said blend comprises
a) from greater than 0 to about 70 parts by weight of said olefin-based polymer; and
b) at least about 30 parts by weight of said impact copolymer,
wherein the total of a) and b) is 100 parts by weight.

### Claim 4 (depends on 2)

The process of claim 2, wherein said olefin-based polymer is polypropylene and said impact copolymer comprises a continuous phase of polypropylene with a dispersed phase of polypropylene/ethylene rubber.

### Claim 5 (depends on 2)

The process of claim 2, wherein said olefin-based polymer has a melt flow index of from about 0.6 to about 5 and said impact copolymer has a melt flow index of from about 0.6 to about 3.5.

### Claim 6 (depends on 1)

The process of claim 1, wherein said film has an average cross machine toughness value of between about 3000 lbs/in2 to 16,000 lbs/in2 after the annealing step.