Method of preparing polycarbonate-polysiloxane block copolymers
Patent 5616674 Issued on April 1, 1997. Estimated Expiration Date: 
September 20, 2015. 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 20, 2015. 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 3240755 3240756 3419634 3419635 Phase transfer catalysis of heterogeneous reactions by quaternary salts Method for making aromatic polycarbonates Patent #: 5391692 InventorsApplicationNo. 531354 filed on 09/20/1995US Classes:528/29, Organic Si-free reactant is an alcohol or alcoholate524/537, Solid polymer or SICP derived from an -O-(C=O)O- or hal-(C=O)-O- containing reactant525/474, Solid polymer derived from silicon-containing reactant528/14, Material is a metal-containing material528/15, Material contains a Group VIII metal atom528/18, Material contains a Group IVA metal atom528/19, Material contains a heavy metal atom528/21, Material is a nitrogen-containing compound528/25, With organic silicon-free reactant528/31, Silicon reactant contains a silicon-to-hydrogen bond528/32, Silicon reactant contains an ethylenically unsaturated group528/41, Silicon containing carboxylic acid or derivative or from a silicon derivative of a nonsilicon containing carboxylic acid528/43Silicon reactant contains an aryl groupExaminersPrimary: Mosley, TerressaInternational ClassC08G 077/04AbstractPolycarbonate-polysiloxane block copolymers are prepared by interfacial polymerization technique in the presence or a phase transfer catalyst.Other References
Field of SearchSolid polymer or SICP derived from an -O-(C=O)O- or hal-(C=O)-O- containing reactantSolid polymer derived from silicon-containing reactant Material is a metal-containing material Material contains a Group VIII metal atom Material contains a Group IVA metal atom Material contains a heavy metal atom Material is a nitrogen-containing compound With organic silicon-free reactant Silicon reactant contains a silicon-to-hydrogen bond Silicon reactant contains an ethylenically unsaturated group Silicon containing carboxylic acid or derivative or from a silicon derivative of a nonsilicon containing carboxylic acid Silicon reactant contains an aryl group Organic Si-free reactant is an alcohol or alcoholate | |
