# US 7,745,000 B2 · Surface-modified plexifilamentary structures, and compositions therefor

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- Number: US 7,745,000 B2
- Document ID: US7745000B2
- Status: Granted
- Kind: B2
- Application number: 12/072,823
- Filed: 2008-02-28
- Published: 2008-06-26
- Granted: 2010-06-29
- Earliest claimed: 2002-09-25
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Mark Gary Weinberg; Gregory T. Dee; Jose Manuel Rodriguez-Parada
- Web page: https://patentgrep.com/patent/US7745000B2

## CPC

- C08L 23/0884: Epoxide-containing esters
- C08L 23/0892: with monomers containing atoms other than carbon, hydrogen or oxygen
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- D01D 5/11: Flash-spinning
- D01F 6/46: of polyolefins
- D01F 6/92: of polyesters
- D04H 1/724: forming webs during fibre formation, e.g. flash-spinning
- Y10T 428/2913: Rod, strand, filament or fiber
- Y10T 428/2915: including textile, cloth or fabric
- Y10T 428/2973: Particular cross section
- Y10T 428/2978: Surface characteristic
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention is concerned with flash-spinning a surface-modified structure such as a plexifilimentary yarn or a microcellular foam.

## Claims

### Claim 1

A plexifilamentary structure formed by flash spinning a spin mixture comprising a polymer blend of: 5 to 30 percent by weight of a functionalized polymer and 70 to 95 percent by weight of an additional polymer;
wherein the functionalized polymer is selected from the group consisting of polyolefins, copolymers thereof with ethylenically unsaturated monomers, polyesters, and mixtures thereof, said polymer comprising 1 to 25 mol % of functional groups;
wherein the additional polymer is selected from the group consisting of polyolefins, copolymers thereof with ethylenically unsaturated monomers, polyesters, and mixtures thereof;
wherein said functional groups form non-fugitive surface modifications on said plexifilamentary structure and said surface modifications exist at an enriched concentration as compared to the bulk concentration of said functional groups.

### Claim 2 (depends on 1)

The plexifilamentary structure of claim 1, wherein said non-fugitive surface modifications are present at a concentration of at least 7.1 wt %, as measured by a surface modifying species of said functional group.

### Claim 3 (depends on 1)

The plexifilamentary structure of claim 1, wherein said non-fugitive surface modifications are present at a concentration of about ten times higher than the bulk concentration, as measured by the surface modifying species of said functional group.

### Claim 4 (depends on 1)

The plexifilamentary structure of claim 1, wherein the additional polymer is polyethylene terephthalate.

### Claim 5 (depends on 1)

The plexifilamentary structure of claim 1, wherein the additional polymer is polyethylene.

### Claim 6 (depends on 1)

The plexifilamentary structure of claim 1, wherein the functional group is selected from the group consisting of fluoro-olefins, oxyethylenes, disubstituted ethylenes, and vinyl silanes.

### Claim 7 (depends on 6)

The plexifilamentary structure of claim 6, wherein the functionalized polymer is grafted with said functional group.

### Claim 8 (depends on 6)

The plexifilamentary structure of claim 6, wherein the functional group is a fluoro-olefin radical.

### Claim 9 (depends on 8)

The plexifilamentary structure of claim 8, wherein said functional group is a perfluorovinyl ether.

### Claim 10 (depends on 6)

The plexifilamentary structure of claim 6, wherein the functional group is oxyethylene trimer.

### Claim 11 (depends on 6)

The plexifilamentary structure of claim 6, wherein the functional group is a vinyl silane.

### Claim 12 (depends on 1)

The plexifilamentary structure of claim 1, wherein the functionalized polymer is polyethylene terephthalate.

### Claim 13 (depends on 1)

The plexifilamentary structure of claim 1, wherein the functionalized polymer is polyethylene.

### Claim 14 (depends on 1)

The plexifilamentary structure of claim 1 wherein the functionalized polymer comprises 5 to 15 mol % of functional groups.