Process to make synthetic leather and synthetic leather made therefrom
First Claim
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1. A method for making an impregnated textile synthetic leather, the method comprising:
- (a) impregnating a non-woven or woven textile with an externally stabilized dispersion of a nonionizable polyurethane and an external stabilizing surfactant, wherein the nonionizable polyurethane substantially fails to have ionic or nonionic hydrophilic pendant groups, and the polyurethane dispersion is not mixed with another dispersion or emulsion; and
(b) exposing the impregnated textile to water containing a coagulant for a coagulation time sufficient to coagulate the dispersionwherein the coagulant is a multivalent cation neutral salt.
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Abstract
A synthetic leather is made by a impregnating a non-woven or woven textile with an aqueous polyurethane dispersion comprised of a nonionizable polyurethane and an external stabilizing surfactant. The impregnated textile is then exposed to water containing a coagulant for a coagulation time sufficient to coagulate the dispersion. The method may be used to form a synthetic leather having excellent wet ply adhesion and may contain an insoluble multivalent cation organic acid.
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Citations
15 Claims
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1. A method for making an impregnated textile synthetic leather, the method comprising:
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(a) impregnating a non-woven or woven textile with an externally stabilized dispersion of a nonionizable polyurethane and an external stabilizing surfactant, wherein the nonionizable polyurethane substantially fails to have ionic or nonionic hydrophilic pendant groups, and the polyurethane dispersion is not mixed with another dispersion or emulsion; and (b) exposing the impregnated textile to water containing a coagulant for a coagulation time sufficient to coagulate the dispersion wherein the coagulant is a multivalent cation neutral salt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification