# US 2019/0375877 A1 · Chemical resistant pud for microfiber nonwoven leather application and the method

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- Number: US 2019/0375877 A1
- Document ID: US20190375877A1
- Status: Published application
- Kind: A1
- Application number: 16/331,859
- Filed: 2016-09-09
- Published: 2019-12-12
- Earliest claimed: 2016-09-09
- Assignees: Dow Global Technologies LLC; Rohm and Haas Company
- Applicants: Dow Global Technologies LLC; Rohm and Haas Company
- Inventors: Chao He; Yi Zhang; Zhaobui Qu; Chao Zhang; Xiangyang Tai
- Web page: https://patentgrep.com/patent/US20190375877A1

## CPC

- C08G 18/12: using two or more compounds having active hydrogen in the first polymerisation step
- C08G 18/283: {Compounds containing ether groups, e.g. oxyalkylated monohydroxy compounds}
- C08G 18/0866: {the dispersing or dispersed phase being an aqueous medium}
- C08G 18/0871: {the dispersing or dispersed phase being organic}
- C08G 18/4812: {Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups}
- C08G 18/4829: {Polyethers containing at least three hydroxy groups (C08G18/4833 - C08G18/5096 take precedence)}
- C08G 18/4837: {and other oxyalkylene units}
- C08G 18/4841: {containing oxyethylene end groups}
- C08G 18/7671: {containing only one alkylene bisphenyl group}
- C08J 5/24: Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
- C08J 5/246: {using polymer based synthetic fibres}
- C08J 5/249: {characterised by the additives used in the prepolymer mixture}
- D06N 3/0004: {using ultra-fine two-component fibres, e.g. island/sea, or ultra-fine one component fibres (< 1 denier)}
- D06N 3/0011: {using non-woven fabrics}
- D06N 3/146: {characterised by the macromolecular diols used}
- C08J 2375/08: from polyethers
- D06N 2211/28: Artificial leather
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- D06N: WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR

## Abstract

The present disclosure provides a polyurethane dispersion comprising a polyurethane prepolymer and an ionic surfactant. It further provides a microfiber nonwoven synthetic leather comprising a microfiber nonwoven fabric and the polyurethane dispersion. It further provides a method of preparing the microfiber nonwoven synthetic leather comprising a step of impregnating microfiber nonwoven fabrics into the polyurethane dispersion.

## Claims

### Claim 1

A polyurethane dispersion comprising:
a polyurethane prepolymer comprising, as polymerized units, by dry weight based on total dry weight of the polyurethane prepolymer, from 25% to 40%, a monomeric aromatic diisocyanate, and from 20% to 85%, a polyether polyol; and
an ionic surfactant.

### Claim 2 (depends on 1)

The polyurethane dispersion according to claim 1, wherein the polyurethane prepolymer further comprises, as polymerized units, from 0.1% to 30% by dry weight based on total dry weight of the polyurethane prepolymer, a polyester polyol.

### Claim 3 (depends on 1)

The polyurethane dispersion according to claim 1, wherein the polyurethane prepolymer has a % NCO from 3 to 10 percent.

### Claim 4 (depends on 1)

The polyurethane dispersion according to claim 1, wherein organic solvent is not used in the preparation of the polyurethane prepolymer.

### Claim 5

A microfiber nonwoven synthetic leather comprising a microfiber nonwoven fabric and a polyurethane dispersion, wherein the polyurethane dispersion comprises a polyurethane prepolymer and an ionic surfactant, wherein the polyurethane prepolymer comprises, as polymerized units, by dry weight based on total dry weight of the polyurethane prepolymer, from 25% to 40%, a monomeric aromatic diisocyanate, and from 20% to 85%, a polyether polyol.

### Claim 6 (depends on 5)

The microfiber nonwoven synthetic leather according to claim 5, wherein the polyurethane prepolymer further comprises, as polymerized units, from 0.1% to 30% by dry weight based on total dry weight of the polyurethane prepolymer, a polyester polyol.

### Claim 7 (depends on 5)

The microfiber nonwoven synthetic leather according to claim 5, wherein the polyurethane prepolymer has an isocyanate content of from 3 to 10 percent by weight based on the weight of the polyurethane prepolymer.

### Claim 8 (depends on 5)

The microfiber nonwoven synthetic leather according to claim 5, wherein organic solvent is not used in the preparation of the polyurethane prepolymer.

### Claim 9 (depends on 1)

A method of preparing the microfiber nonwoven synthetic leather, wherein it comprises a step of impregnating microfiber nonwoven fabrics into the polyurethane dispersion of claim 1.

### Claim 10 (depends on 9)

The method of preparing the microfiber nonwoven synthetic leather according to claim 9, wherein it further comprises a step of subjecting the impregnated microfiber nonwoven fabrics to a toluene dissolution process.

### Claim 11 (depends on 9)

The method of preparing the microfiber nonwoven synthetic leather according to claim 9, wherein it further comprises a step of subjecting the impregnated microfiber nonwoven fabrics to an alkaline dissolution process.