Stabilizers for thermo plastic materials
Patent 5308549 Issued on May 3, 1994. Estimated Expiration Date: 
October 9, 2012. 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.
October 9, 2012. 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 2535058 3282891 3337495 3880805 3907749 Stabilization systems from triarylphosphites and phenols Ortho-substituted aryl phosphite additive composition Chroman derivatives useful as stabilizers for polypropylene and ଲ-carotin Chroman derivatives and stabilized polypropylene composition Poly-1-butene resin composition InventorsAssigneeApplicationNo. 955000 filed on 10/09/1992US Classes:252/399, Organic compound containing252/407, Oxygen organic compound containing524/110, Six-membered chalcogen ring524/317, Oxygen atom other than as part of a carboxylic acid group, e.g., glycolic ester, etc.524/386, At least two -OH groups524/389Two or more compounds containing -OH groups, or with water NRMExaminersPrimary: Michl, Paul R.Assistant: Yoon, Tae H. Attorney, Agent or FirmForeign Patent References
International ClassesC09K 015/06C08K 005/15 C08K 005/10 C08K 005/05 AbstractStabilizing mixtures for a plastic material are disclosed. The mixture is comprised of (a) about one part by weight of a tocopherol compound; and (b) from about 1.4 to about 5.0 parts by weight of a secondary antioxidant.Other References
Field of SearchOrganic compound containingOxygen organic compound containing Six-membered chalcogen ring Two or more OH groups Only C, H, and O atoms Oxygen atom other than as part of a carboxylic acid group, e.g., glycolic ester, etc. At least two -OH groups Two or more compounds containing -OH groups, or with water NRM | |
