Aqueous urethane resin composition and synthetic leather

Patent metadata

Field	Value
Publication number	US-11795267-B2
Application number	US-201716347061-A
Country	US
Kind code	B2
Filing date	Oct 26, 2017
Priority date	Dec 12, 2016
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

An aqueous urethane resin composition includes a urethane resin and an aqueous medium, wherein the urethane resin is a reaction product of a polyol comprising an anionic group-containing polyol and an aromatic polyisocyanate, and has an anionic group concentration of 0.35 mmol/g or less. A synthetic leather is also provided. The synthetic leather includes a laminate including at least a base fabric, a bonding layer, and a skin layer, wherein the bonding layer is made from the aqueous urethane resin composition. A task to be achieved is to provide an aqueous urethane resin composition exhibiting excellent peel strength, hydrolytic resistance, and light resistance.

First claim

The invention claimed is:

1. A synthetic leather comprising a laminate comprising at least a base fabric (i), a bonding layer (ii), and a skin layer (iii),
wherein the bonding layer (ii) is made from an aqueous urethane resin composition comprising a urethane resin (A); and an aqueous medium (B),
wherein the urethane resin (A) is a reaction product of a polyol (a1) comprising an anionic group-containing polyol (a1-1) and an aromatic polyisocyanate (a2),
wherein the urethane resin (A) has an anionic group concentration of 0.11 mmol/g or more and 0.35 mmol/g or less,
wherein the polyol (a1) further comprises polyether polyol,
wherein a content of the anionic group-containing polyol (a1-1) in the polyol (a1) is in a range of 1.57 to 3% by mass,
wherein the aromatic polyisocyanate (a2) comprises toluene diisocyanate,
wherein the urethane resin (A) further comprises, as a raw material, a chain extender having a hydroxyl group including 1,3-butanediol, and
wherein a weight average molecular weight of the urethane resin (A) is in a range of 13,000 to 70,000.

2. The synthetic leather according to claim 1 , wherein the urethane resin (A) has an aromatic ring concentration in the range of 0.1 to 2.5 mol/kg.

3. The synthetic leather according to claim 1 , wherein the polyol (a1) further comprises at least one of polyester polyol, acrylic polyol, and polybutadiene polyol.

4. The synthetic leather according to claim 1 , wherein the anionic group concentration is 0.11 mmol/g or more and 0.22 mmol/g or less.

5. The synthetic leather according to claim 1 , wherein the urethane resin (A) has an aromatic ring concentration in the range of 0.1 to 0.75 mol/kg.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Maeda Ryo

Classifications

• C08G18/7614 Primary

  containing only one aromatic ring · CPC title

• C08G18/3206

  aliphatic · CPC title

• C08G18/348

  Hydroxycarboxylic acids · CPC title

• C08G18/4018

  Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48 · CPC title

• C08G18/4238

  derived from dicarboxylic acids and dialcohols · CPC title