Ultraviolet light absorbing agents and compositions and articles containing same
Patent 4278804 Issued on July 14, 1981. Estimated Expiration Date: 
May 30, 2000. 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.
May 30, 2000. 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 2637838 3352896 3395116 3489781 3708225 Paint compositions Pigment-free coating compositions Benzophenone derivatives and their preparation and application Ultraviolet screening agents and coating materials containing organosilane ester groups InventorsAssigneeApplicationNo. 06/154622 filed on 05/30/1980US Classes:556/436, Carbonyl attached directly or indirectly to silicon by nonionic bonding106/287.13, C bonded directly to Si atom428/412, Of polycarbonate528/32, 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 ring528/43, Silicon reactant contains an aryl group556/416, Chalcogen bonded directly to plural carbons or double-bonded directly to carbon556/442Silicon is bonded directly to the oxy of the -COO- groupExaminersPrimary: Shaver, Paul F.Attorney, Agent or FirmInternational ClassesC07C 45/00 (20060101)C07C 45/71 (20060101) C08K 5/00 (20060101) C08K 5/5419 (20060101) C08K 5/5475 (20060101) C09D 183/04 (20060101) C07F 7/00 (20060101) C07F 7/18 (20060101) AbstractThere are provided ultraviolet light absorbing agents of the following general formula ##STR1## wherein: X is ##STR2## Y is H or OH, Z is H, OH, OQ or OW, where at least one Z is OH if Y is H;Q is --CH2 (CH2)n Si(R2)x (OR1)y ; andW is --Cm H2m+1 ;where x=0, 1 or 2, y=1, 2 or 3, x+y=3, R1 =alkyl or alkanoyl having 1 to 6 carbon atoms, R2 =alkyl having 1 to 6 carbon atoms, n=0, 1 or 2, and m=1 to 18. Also provided are organopolysiloxane protective coating compositions containing said ultraviolet light absorbing agents having unique utility for protecting transparent plastic articles.Other References
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