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Leather-like sheet

A sheet and leather technology, used in transportation and packaging, textiles and papermaking, thin material processing, etc., can solve the problems of difficulty in obtaining soft leather-like sheets, no records, etc., and achieve excellent surface quality, durability and resistance. The effect of excellent flexibility and soft touch

Active Publication Date: 2009-05-27
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in any of the above-mentioned Patent Documents 2 and 3, there is no description that the above-mentioned resin composition can be used in the skin layer of the leather-like sheet.
[0017] As described above, in the techniques proposed in the above-mentioned Patent Documents 1 to 3, it is difficult to obtain a leather-like sheet having a skin layer that suppresses fluff while ensuring excellent flexibility and the like.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0152] Hereinafter, the present invention will be described in more detail with reference to examples.

[0153] [Measuring method of number average molecular weight (Mn)]

[0154] It measured using the gel permeation chromatography (GPC) method, and calculated|required the number average molecular weight (Mn) by polystyrene conversion.

[0155] [Measuring method of melt viscosity]

[0156] The melt viscosity (mPa·s) of the urethane prepolymer was measured using a cone and plate viscometer (manufactured by ICI Corporation, measuring temperature: 125° C.).

[0157] [Measurement method of glass transition temperature (Tg)]

[0158] The glass transition temperature (Tg) of the urethane prepolymer is obtained by coating the urethane prepolymer to a thickness of 150 μm, aging it for 5 days at an ambient temperature of 23°C and a relative humidity of 65%, and then using a dynamic adhesive The film was measured with an elastic measuring device (manufactured by Rheometric, frequency...

Synthetic example 1

[0180] The alkylene oxide adduct of bisphenol A obtained by adding 6 mol of propylene oxide on 1 mol of bisphenol A reacts with sebacic acid and isophthalic acid to obtain a polyester polyol (I) with a number average molecular weight of 2000 .

[0181] In a 1L four-necked flask, at 120°C, 50 parts by mass of polytetramethylene glycol with a number average molecular weight of 2000 and 50 parts by mass of the polyester polyol (I) synthesized above were heated under reduced pressure to dehydrate them. to a moisture content of 0.05% by mass.

[0182] Next, in the above-mentioned mixture of polytetramethylene glycol and polyester polyol (I) cooled to 60°C, add 20 parts by mass of 4,4'-diphenylmethane diisocyanate, and then add 0.01 part by mass of diphenylmethane diisocyanate Butyltin dilaurate was used as a catalyst, and then the temperature was raised to 110° C., and the reaction was carried out for 5 hours until the content of isocyanate groups was constant to obtain a urethane...

Synthetic example 2

[0184] In 100 parts by mass of the above-mentioned urethane prepolymer (1) heated to 110°C, add 0.68 parts by mass of 2-hydroxyethyl acrylate and 0.01 part by mass of tin octoate to react to obtain the urethane prepolymer (2 ). The ratio ([HEA / NCO]×100) of the number of isocyanate groups reacted with the hydroxyl groups of 2-hydroxyethyl acrylate to the total number of isocyanate groups in the urethane prepolymer (1) was 10%.

[0185] In addition, ([HEA / NCO]×100) of the above-mentioned urethane prepolymer (2) was calculated|required by the following method. An excess amount of dibutylamine is added to the urethane prepolymer (2), and the remaining isocyanate groups in the urethane prepolymer (2) are reacted with dibutylamine. Next, the amount of the remaining dibutylamine was determined by back titration using hydrochloric acid, thereby calculating the amount of isocyanate groups contained in the urethane prepolymer (2). ([HEA / NCO]×100) of the urethane prepolymers (3) to (12...

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Abstract

Disclosed is a leather-like sheet (1) having at least a base layer (11) and a skin layer (12). The skin layer (12) is composed of a crosslinked product of a polyurethane hot melt composition which contains 100 parts by mass of a urethane prepolymer (A), 5-40 parts by mass of a coloring agent (B) containing a polyol as a vehicle, 5-50 parts by mass of a polyfunctional (meth)acrylate (C), and 0.5-5 parts by mass of a photopolymerization initiator (D). The urethane prepolymer (A) is obtained by reaction 5-50% of the total number of isocyanate groups contained in an isocyanate group-containing urethane prepolymer, which is obtained by reacting apolyol (a1) containing not less than 40% by mass of a polytetramethylene glycol and a polyisocyanate (a2), with a hydroxy group-containing (meth)acrylate. The leather-like sheet (1) has excellent surface quality, while securing excellent flexibility and bending resistance.

Description

technical field [0001] The present invention relates to a leather-like sheet useful for footwear such as women's shoes, sneakers, sandals, furniture, clothing and the like. Background technique [0002] Leather-like sheets such as artificial leather and synthetic leather are used in a wide range of applications such as footwear and clothing. The basic structure of the above-mentioned leather-like sheet is, for example, a laminated structure formed of a skin layer, an adhesive layer, and a base layer. As the base layer, base fabrics such as non-woven fabrics and woven fabrics can be used, or in these The base fabric is impregnated with a resin such as polyurethane resin, and the surface of the base fabric is provided with a porous layer formed of resin such as polyurethane resin. [0003] The above-mentioned leather-like sheet has conventionally been produced by a method such as (1) coating an organic solvent solution of a polyurethane resin on a substrate layer by a gravure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/14
CPCD06N3/14D06N3/146D06N3/145D06N2211/28D06N3/0056D06N3/0063D06N3/0065Y10T428/269Y10T428/31551Y10T428/249988D06N3/08
Inventor 金川善典丹羽俊夫玉木淑文鹰嘴实
Owner DIC CORP
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