Process for the production of patent leather and patent leather prepared therefrom
Patent 5151329 Issued on September 29, 1992. Estimated Expiration Date: 
September 29, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 29, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3245827 Process for the manufacture of polyurethane elastomers Thermoplastic polyurethane resins Coating and dressing agents for leather and leather substitutes based on polyurethane urea coating compounds Patent #: 4401801 InventorsApplicationNo. 371357 filed on 06/26/1989US Classes:428/423.4, Next to animal skin or membrane427/389, Proteinaceous base (e.g., wool, leather, etc.)428/473, Of animal membrane or skin528/79, Ether or thioether contains a carbocyclic or aromatic group528/80, With reactant compound containing at least two -C-C(=X)-X-C groups and which compound is devoid of C-NH, C=NH or C-N(H)-H groups528/83Reactant which contains at least two -C-C(=X)-X-C groups has been derived from only a dicarboxylic acid or derivative and only a dihydric alcohol or alcoholate derivativeExaminersPrimary: Thibodeau, Paul J.Assistant: Nakarani, D. S. Attorney, Agent or FirmInternational ClassesB32B 009/02B32B 027/40 Foreign Application Priority Data1988-07-07 DEAbstractThe present invention is directed to a process for the production of high-gloss patent leather from two-component polyurethane compositions by reacting hydroxyl group-containing oligourethanes with polyisocyanates, characterized in that the oligourethanes have been synthesized fromA) at least 2 macrodiols in a molar ratio of about 1:6 to 6:1 wherein1) the first macrodiol has an average molecular weight of 254 to about 650 and contains an aromatic ring or a saturated or unsaturated cycloaliphatic ring and2) the second macrodiol has an average molecular weight of about 1,200 to 3,000, provided that the molecular weight of macrodiol A/2 is at least 3 times the molecular weight of macrodiol A/1, andB) at least one diisocyanate,wherein the macrodiol:diisocyanate molar ratio is about 1.0:0.9 to 1.0:0.3.The present invention is also directed to the high-gloss patent leather prepared in accordance with the above process.Field of SearchOf animal membrane or skinNext to animal skin or membrane Proteinaceous base (e.g., wool, leather, etc.) Ether or thioether contains a carbocyclic or aromatic group With reactant compound containing at least two -C-C(=X)-X-C groups and which compound is devoid of C-NH, C=NH or C-N(H)-H groups Reactant which contains at least two -C-C(=X)-X-C groups has been derived from only a dicarboxylic acid or derivative and only a dihydric alcohol or alcoholate derivative | |
