Spreading pastes containing polyurethane plastics and a process for the production of polyurethane coatings permeable to water vapor
AssigneeBayer Aktiengesellschaft
InventorsKlaus Nachtkamp, Wilhelm Thoma, Josef Pedain, Walter Schroer, Rolf Langel
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Abstract
This invention relates to spreading pastes containing polyurethanes which are prepared from special synthesis components selected from the group of silicone resins, polyethers or polyesters containing aromatic segments or perfluorocarbon resins. The spreading pastes also contain organic solvents and optionally non-solvents for the polyurethanes so that when the coatings are used to coat textile substrates according to the direct or transfer process, the coatings may be cured based on the principle of evaporation coagulation.
Claims10
A process for the production of a coating permeable to water vapor on a fabric or leather substrate which comprises applying an optionally pigmented spreading paste comprising a multiphase mixture of
- (A) about 5 to 50% by weight of a hydrophobic polyurethane and/or polyurethane urea wherein a synthesis component comprising a member selected from the group consisting of silicone resins, polyethers containing aromatic segments, polyesters containing aromatic segments and perfluorocarbon resins is used in an amount sufficient for said polyurethane and/or polyurethane urea to contain about 1 to 30% by weight of said synthesis component,
- (B) 0 to about 30% by weight of a hydrophobic polyurethane and/or polyurethane urea which has not been synthesized with said synthesis component,
- (C) about 4.5 to 50% by weight of an organic solvent suitable for solubilizing components (A) and (B),
- (D) 0 to about 40% by weight of an organic non-solvent which will not solubilize components (A) and (B),
- (E) 0 to about 10% by weight of a polymer which does not contain either urethane or urea groups and which does contain a carboxyl group completely or partly neutralized with a base,
- (F) about 10 to 70% by weight of water and
- (G) 0 to about 5% by weight of a crosslinking agent, hydrophobicizing agent or stabilizer, to a fabric or leather substrate by the direct or transfer method and subsequently curing the coating using the technique of evaporation coagulation.
Dependencies are inferred from the claim text.