Silane-functionalized ultraviolet screen precursors
Patent 4372835 Issued on February 8, 1983. Estimated Expiration Date: 
January 28, 2002. 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.
January 28, 2002. 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 Re27281 2955128 2968643 3391109 3708225 Paint compositions Method for making certain halonium salt photoinitiators Pigment-free coating compositions Photoinitiators Coated Polymeric substrates InventorsAssigneeApplicationNo. 06/343692 filed on 01/28/1982US Classes:428/412, Of polycarbonate522/170, 1,2 epoxy522/172, Processes of preparing a solid polymer from at least one silicon containing monomer; or compositions therefore522/75, Heterocyclic ring containing DNRM522/77, Silicon containing DNRM522/907, INVOLVING PRECURSOR OF AN ULTRAVIOLET ABSORBER, E.G., MONOBENZOATE, ETC.525/100, With saturated Si-C or Si-H reactant or polymer thereof; or with solid copolymer derived from at least one Si-C or Si-H reactant wherein at least one of the reactants forming the solid copolymer is saturated; or with SPFI wherein at least one of the necessary ingredients contains a Si-C or Si-H bond or with a reaction product thereof; or with a SICP containing a Si-H or Si-C bond525/403, Solid polymer is derived from 1,2-epoxy compound containing only one 1,2 epoxy group as sole reactant and wherein none of the reactants contains a plurality of methylol groups or derivatives thereof525/477, Mixed with silicon-containing reactant or polymer therefrom528/32, Silicon reactant contains an ethylenically unsaturated group528/34, With silicon reactant containing a single silicon atom528/40, Silicon reactant contains a fused, bridged, or cycloaliphatic ring528/43Silicon reactant contains an aryl groupExaminersPrimary: Bleutge, John C.Assistant: Koeckert, A. H. Attorney, Agent or FirmInternational ClassesC09D 4/00 (20060101)B05D 7/02 (20060101) C07F 7/00 (20060101) C07F 7/18 (20060101) C08J 7/00 (20060101) C08J 7/04 (20060101) AbstractSilane-functionalized ultraviolet screening agent precursors comprise compounds of the formula: ##STR1## wherein R is ##STR2## R1 is C1 -C6 alkyl, R2 is C1 -C6 alkyl or C2 -C6 alkanoyl, R3 is hydrogen or C1 -C6 alkoxyl, X is 0,1 or 2, y is 1,2, or 3 and x+y=3. Under ultraviolet radiation the compounds rearrange to the corresponding -hydroxybenzophenones which protect substrates, especially transparent plastics, against degradation. | |
