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 a polyurethane dispersion comprised of a nonionizable polyurethane and an external stabilizing surfactant; and
(b) exposing the impregnated textile to water containing a coagulant for a coagulation time sufficient to coagulate the dispersion.
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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
43 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 a polyurethane dispersion comprised of a nonionizable polyurethane and an external stabilizing surfactant; and
(b) exposing the impregnated textile to water containing a coagulant for a coagulation time sufficient to coagulate the dispersion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for making synthetic leather having a poromeric layer thereon, the method comprising:
(a) applying onto a textile, impregnated with a polymer, a frothed aqueous polyurethane dispersion, the aqueous polyurethane dispersion having an externally stabilizing surfactant; and
then (b) heating to a temperature sufficient to dry and cure the product of step (a) to form the synthetic leather having a poromeric layer.- View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
- 28. A synthetic leather comprised of a textile having a plurality of fibers wherein the textile has therein a polyurethane and a multivalent cation substantially water insoluble salt of an organic acid.
- 36. A synthetic leather comprised of a textile having a poromeric layer comprised of polyurethane thereon wherein the synthetic leather has an amount of a surfactant of at least a trace amount to at most about 4% by weight of the poromeric layer and a wet ply adhesion of at least about 1.5 kg/cm.
Specification