# US 10,369,059 B2 · Disposable hygiene article comprising a melt-spun elastic fiber

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- Number: US 10,369,059 B2
- Document ID: US10369059B2
- Status: Granted
- Kind: B2
- Application number: 15/029,135
- Filed: 2014-10-07
- Published: 2016-09-08
- Granted: 2019-08-06
- Earliest claimed: 2013-10-14
- Assignees: BASF SE
- Applicants: BASF SE
- Inventors: Bin-Erik Chen
- Web page: https://patentgrep.com/patent/US10369059B2

## CPC

- A61F 13/4902: {characterised by the elastic material}
- A61F 13/15593: {having elastic ribbons fixed thereto; Devices for applying the ribbons}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

The present invention relates to a disposable hygiene article comprising a melt-spun elastic fiber, in particular a diaper. Furthermore, the present invention relates to a process for preparing a disposable hygiene article comprising the steps of providing a melt-spun elastic fiber and applying the melt-spun elastic fiber to a disposable hygiene article or a part which is used to prepare the disposable hygiene article; as well as the use of a melt-spun elastic fiber in a preparation process for preparing a disposable hygiene article.

## Claims

### Claim 1

A disposable hygiene article, comprising a melt-spun elastic fiber based on a thermoplastic polyurethane and a cross linker comprising isocyanate groups, wherein the thermoplastic polyurethane has a shore hardness of from 60A to 98A, determined according to DIN 53505.

### Claim 2 (depends on 1)

The disposable hygiene article according to claim 1, wherein the melt-spun elastic fiber has no signal in the range of from 1620 cm−1 to 1640 cm−1 in an IR-spectrum.

### Claim 3 (depends on 1)

The disposable hygiene article according to claim 1, wherein the melt-spun elastic fiber has a linear density of from 200D to 800D.

### Claim 4 (depends on 1)

The disposable hygiene article according to claim 1, wherein the melt-spun elastic fiber has a linear density of from 800D to 1000D.

### Claim 5 (depends on 1)

The disposable hygiene article according to claim 1, wherein the thermoplastic polyurethane has a shore hardness of from 70 A to 98 A, determined according to DIN 53505.

### Claim 6 (depends on 1)

The disposable hygiene article according to claim 1, wherein the melt-spun elastic fiber has a kofler melting temperature of from 25° C. to 230° C.

### Claim 7 (depends on 1)

The disposable hygiene article according to claim 1, wherein the melt-spun elastic fiber is prepared by a process comprising:
(i) melting a thermoplastic polyurethane in an extruder at a temperature of 180° C. to 220° C. to obtain a molten thermoplastic polyurethane;
(ii) to the molten thermoplastic polyurethane, adding a composition comprising a cross linker comprising isocyanate groups and mixing the resulting mixture to form a melt; and
(iii) extruding the melt through a spinneret heated at 190° C. to 230° C. to obtain a melt-spun elastic fiber.

### Claim 8 (depends on 1)

The disposable hygiene article according to claim 1, wherein the melt-spun elastic fiber is prepared by a process comprising:
(i) melting a thermoplastic polyurethane in an extruder at a temperature of 180° C. to 220° C. to obtain a molten thermoplastic polyurethane;
(ii) to the molten thermoplastic polyurethane, adding a composition comprising a cross linker comprising isocyanate groups and mixing the resulting mixture to form a melt;
(iii) extruding the melt through a spinneret heated at 190° C. to 230° C. to obtain a melt-spun elastic fiber;
(iv) spraying finish oil on the melt-spun elastic fiber, the finish oil being selected from the group consisting of mineral oil, silicone oil, and a combination thereof;
(v) winding up the melt-spun elastic fiber through a roller at a line speed of 100 to 1000 m/min; and
(vi) storing the melt-spun elastic fiber.

### Claim 9 (depends on 1)

The disposable hygiene article according to claim 1, wherein the disposable hygiene article is a diaper.

### Claim 10

A process for preparing a disposable hygiene article, the process comprising applying a melt-spun elastic fiber to a disposable hygiene article or a part which is used to prepare the disposable hygiene article, wherein:
the melt-spun elastic fiber is based on a thermoplastic polyurethane and a cross linker comprising isocyanate groups; and
the thermoplastic polyurethane has a shore hardness of from 60A to 98A, determined according to DIN 53505.

### Claim 11 (depends on 10)

The process according to claim 10, wherein the melt-spun elastic fiber has no signal in the range of from 1620 cm−1 to 1640 cm−1 in an IR-spectrum.

### Claim 12 (depends on 10)

The process according to claim 10, wherein the melt-spun elastic fiber has a linear density of from 200D to 800D.

### Claim 13 (depends on 10)

The process according to claim 10, wherein the melt-spun elastic fiber has a linear density of from 800D to 1000D.

### Claim 14 (depends on 10)

The process according to claim 10, wherein the melt-spun elastic fiber is applied to the disposable hygiene article or the part which is used to prepare the disposable hygiene article by melt bonding the fiber to the surface of the disposable hygiene article or the part which is used to prepare the disposable hygiene article.