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Synthetic leather foam layer made from polyester polyol based backbone polyurethane dispersion

A polyester polyol, synthetic leather technology, used in transportation and packaging, fiber processing, textiles and papermaking, etc., can solve problems such as poor peel strength

Active Publication Date: 2015-06-24
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although such synthetic leathers have a high solids content and a good hand, they have poor peel strength

Method used

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  • Synthetic leather foam layer made from polyester polyol based backbone polyurethane dispersion
  • Synthetic leather foam layer made from polyester polyol based backbone polyurethane dispersion
  • Synthetic leather foam layer made from polyester polyol based backbone polyurethane dispersion

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Embodiment Construction

[0029] The methods and leathers disclosed herein require the incorporation of at least one polyester polyol, at least one polyether polyol, and at least one isocyanate into the PUD.

[0030] Polyester polyols are compounds that have an ester-containing backbone and additionally contain at least two OH groups. They are typically made from aliphatic organic dicarboxylic acids having 2 to 12 carbons, preferably aliphatic dicarboxylic acids having 4 to 6 carbons, and polyvalent alcohols, preferably diols, having 2 to 12 carbons. Examples of aliphatic dicarboxylic acids include succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, maleic acid, fumaric acid, phthalic acid, Isophthalic acid and terephthalic acid. It is also possible to use the corresponding dicarboxylic acid derivatives, for example dicarboxylic acid monoesters or diesters of alcohols having 1 to 4 carbons, or dicarboxylic acid anhydrides. Examples of divalent...

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Abstract

Disclosed herein are methods of producing externally stabilized, poromeric synthetic leathers having improved peel strength, the methods comprising: preparing a prepolymer from a mixture comprising at least one polyester polyol, at least one polyether polyol, at least one isocyanate and optionally in a solvent; mixing the prepolymer, water, and a first surfactant; optionally add a second chain extender to form a PUD; preparing a mixture comprising said PUD, at least one surfactant, and at least one thickener; frothing said mixture; applying the frothed mixture to a fabric and thereby fomiing a coated fabric; adjusting the thickness of the frothed mixture on the coated fabric; drying the coated fabric. Methods of improving the peel strength of poromeric synthetic leathers are also disclosed. Externally stabilized synthetic leathers having improved peel strength are also disclosed.

Description

Background technique [0001] Currently, most polyurethane (PU) synthetic leathers are produced using organic solvents such as dimethylformamide, methyl ethyl ketone (MEK), and toluene. These solvents evaporate during and after manufacturing, creating potential health concerns for manufacturing workers, end users of synthetic leather, and the environment. Consequently, European standards for solvent PU based synthetic leathers have changed to require DMF in the leather to be below 10 ppm. Manufacturing such leathers using organic solvent-based methods is a challenge. Therefore, the use of solvent-free or aqueous PUs (also known as polyurethane dispersions or PUDs) has attracted attention because they use little, if any, organic solvents. [0002] PUDs are aqueous emulsions of PU particles in water with high solids content, small particle size, and extended stability (up to six months or longer). When using PUD to manufacture synthetic leather, the following general method is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/14D06M15/564
CPCD06N3/146D06N3/0006D06N3/0047D06N3/0077D06N3/0088D06N3/123D06N3/14D06N2211/28Y10T428/249953
Inventor W·顾N·康B·刘Y·严C·张H·张
Owner DOW GLOBAL TECH LLC
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