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Urethane resin composition, leather-like sheet, and method for producing the leather-like sheet

a technology of urethane resin and composition, which is applied in the direction of synthetic resin layered products, chemistry apparatus and processes, layered products, etc., can solve the problems of insufficient resilience of goods produced using high cost, and high cost of aqueous urethane resin composition, etc., and achieve the effect of adequate resilien

Active Publication Date: 2016-07-21
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an aqueous urethane resin composition that can be used as a material of leather-like sheets such as artificial leather and synthetic leather. The composition is capable of impregnating fibers and forming a coating film with resistance to discoloration and flexibility. The composition does not detach from the fiber base when colored, making it suitable for use as a coating agent or adhesive. The main technical effect of the invention is to provide a novel and effective material for leather-like sheets that meets the demand of consumers for high-quality and durable leather-like sheets.

Problems solved by technology

However, this aqueous urethane resin composition is likely to become discolored with time.
Furthermore, goods produced using the aqueous urethane resin composition are paper-like and do not have resilience.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Aqueous Urethane Resin Composition (X-1)

[0082]In the presence of 3,281 parts by mass of methyl ethyl ketone and 0.1 parts by mass of stannous octoate, 1,000 parts by mass of polycarbonate polyol (“NIPPOLLAN 980R” produced by Nippon Polyurethane Industry Co., Ltd., number-average molecular weight; 2,000) was reacted with 17 parts by mass of 2,2′-dimethylolpropionic acid, 47 parts by mass of ethylene glycol, and 344 parts by mass of diphenylmethane diisocyanate at 70° C. until the viscosity of the reaction solution reached 20,000 mPa·s. Subsequently, 3 parts by mass of methanol was added to the reaction solution in order to stop the reaction. Thus, a methyl ethyl ketone solution of a urethane resin (A-1) was prepared. The solution of a urethane resin was mixed with 70 parts by mass of polyoxyethylene distyrenated phenyl ether (hydrophile-lipophile balance [hereinafter, abbreviated as “HLB”]; 14, average number of moles of oxyethylene group included; 10, hereinafter, abb...

example 2

Preparation of Aqueous Urethane Resin Composition (X-2)

[0084]In the presence of 3,281 parts by mass of methyl ethyl ketone and 0.1 parts by mass of stannous octoate, 1,000 parts by mass of polyether polyol (“PTMG2000” produced by Mitsubishi Chemical Corporation, number-average molecular weight; 2,000) was reacted with 17 parts by mass of 2,2′-dimethylolpropionic acid, 47 parts by mass of ethylene glycol, and 344 parts by mass of diphenylmethane diisocyanate at 70° C. until the viscosity of the reaction solution reached 20,000 mPa·s. Subsequently, 3 parts by mass of methanol was added to the reaction solution in order to stop the reaction. Thus, a methyl ethyl ketone solution of a urethane resin (A-2) was prepared. The solution of a urethane resin was mixed with 70 parts by mass of (B-1) and 13 parts by mass of triethylamine. To the resulting mixture, 800 parts by mass of ion-exchange water was added in order to perform phase inversion emulsification. Thus, an emulsion containing the...

example 3

Preparation of Aqueous Urethane Resin Composition (X-3)

[0086]In the presence of 3,281 parts by mass of methyl ethyl ketone and 0.1 parts by mass of stannous octoate, 1,000 parts by mass of polyester polyol (“PLACCEL 220” produced by Daicel Corporation, number-average molecular weight; 2,000) was reacted with 17 parts by mass of 2,2′-dimethylolpropionic acid, 47 parts by mass of ethylene glycol, and 344 parts by mass of diphenylmethane diisocyanate at 70° C. until the viscosity of the reaction solution reached 20,000 mPa·s. Subsequently, 3 parts by mass of methanol was added to the reaction solution in order to stop the reaction. Thus, a methyl ethyl ketone solution of a urethane resin (A-3) was prepared. The solution of a urethane resin was mixed with 70 parts by mass of (B-1) and 13 parts by mass of triethylamine. To the resulting mixture, 800 parts by mass of ion-exchange water was added in order to perform phase inversion emulsification. Thus, an emulsion containing the urethane ...

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PUM

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Abstract

Provided is an aqueous urethane resin composition with which a fiber base can be impregnated, which is capable of thermal coagulation, which does not detach from the fiber base due to water or heat in the step of coloring the impregnated base, and which is capable of forming a coating film having resistance to discoloration which may occur with time and an excellent feeling, that is, flexibility and resilience. The aqueous urethane resin composition includes a urethane resin, a nonionic emulsifier, and an aqueous medium, the urethane resin being produced by reacting a polyol including a polyol including a carboxyl group with an aromatic polyisocyanate and a chain extender, the content of urea linkage in the urethane resin being 0.3 mol / kg or less. Also provided is a leather-like sheet produced by impregnating a fiber base with the aqueous urethane resin composition and subsequently performing thermal coagulation of the urethane resin composition.

Description

TECHNICAL FIELD[0001]The present invention relates to an aqueous urethane resin composition that can be used for producing leather-like sheets or the like.BACKGROUND ART[0002]Aqueous urethane resin compositions produced by dispersing a urethane resin in an aqueous medium have been widely used as a material of leather-like sheets such as artificial leather and synthetic leather, coating agents, adhesives, or the like, because the aqueous urethane resin compositions cause a smaller environmental load than the organic-solvent-based urethane resin compositions of the related art.[0003]In general, most of the leather-like sheets are constituted by a base composed of nonwoven fabric or the like, an intermediate layer including a porous layer, and a surface coating layer, and the base is produced by impregnating a fiber base composed of nonwoven fabric or the like with an aqueous urethane resin composition and subsequently performing thermal coagulation of the urethane resin composition in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D06M15/572
CPCD06M2101/32D06M15/572C08K5/06D06N3/146C08G18/4854C08G18/6659C08G18/6692C08G18/7657C08G18/0823C08G18/3206C08G18/348C08G18/42C08G18/44D06M15/564D06M15/568C08L75/04
Inventor TETSUI, TOMOHIRO
Owner DAINIPPON INK & CHEM INC
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