Stabilizing leather against thermal and photochemical decomposition
AssigneeCiba Specialty Chemicals Corporation
InventorsFranz Wyss, Vladimir Arnold, Helena Dbaly, Gisbert Leuschner, Manfred Rembold, Alois Puntener
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Abstract
Water-emulsifiable or -dispersible physical forms of sterically hindered mines, UV absorbers and antioxidants and their use for thermal and photochemical stabilization of materials of plastics, textile coatings, imitation leather and leather are described. The physical forms comprise a) a sterically hindered amine, b) a UV absorber and/or c) an antioxidant and d) if appropriate, water and other additives.
Claims32
A composition for improving the resistance of leather and imitation leather to the influence of light and/or heat, which comprises a) an amount, which is effective to improve the resistance of said leather and imitation leather to the influence of light and/or heat of at least one of a water-insoluble sterically hindered amine, a water insoluble UV absorber or a water-insoluble antioxidant,
- b) a polyalcohol which is completely or partly esterified with a fatty acid,
- c) a reaction product of a polyalcohol, which is completely or partly esterified with a fatty acid, an alkylene oxide and, optionally,
- d) water and/or a stabilizer, diluent, fat-liquoring agent, agent which influences handle, acrylic resin, polyurethane, flame-proofing agent, emulsion carrier and/or hydrophobizing agent, with the proviso that components b) and c) are present in an amount which is effective to emulsify component a).
A process for improving the resistance of a leather or imitation leather substrate to the influence of light or heat or both, which comprises treating said substrate with an aqueous liquor consisting essentially of water, an amount which is effective to emulsify the below-specified combination of components a), b) and c) of an emulsifier or dispersant and an amount which is effective to improve the resistance of said leather or imitation leather to the influence of light and/or heat of
- a) a water-insoluble sterically hindered amine and,
- b) a water-insoluble UV absorber or
- c) a water-insoluble antioxidant,
- or a) plus both of b) and c).
An aqueous liquor for improving the resistance of a leather or imitation leather substrate to the influence of light or heat or both, which aqueous liquor consists essentially of water, an amount which is effective to emulsify the below-specified combination of components a), b) and c) of an emulsifier or dispersant and an amount which is effective to improve the resistance of the leather or imitation leather to the influence of light and/or heat of
- a) a water-insoluble sterically hindered amine and,
- b) a water-insoluble UV absorber or
- c) a water-insoluble antioxidant,
- or a) plus both of b) and c).
Dependencies are inferred from the claim text.