Ultraviolet absorbing copolymers
Patent 4362895 Issued on December 7, 1982. Estimated Expiration Date: 
September 21, 2001. 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 21, 2001. 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 2962533 3049503 3107199 3113907 3133042 3173893 3215665 3320116 3341493 3366668 InventorsAssigneeApplicationNo. 06/303969 filed on 09/21/1981US Classes:136/256, Contact, coating, or surface geometry428/334, Coating layer not in excess of 5 mils thick or equivalent428/411.1, COMPOSITE (NONSTRUCTURAL LAMINATE)428/520, Ester, halide or nitrile of addition polymer428/522, Ester, halide or nitrile of addition polymer428/913MATERIAL DESIGNED TO BE RESPONSIVE TO TEMPERATURE, LIGHT, MOISTURE, ETC.ExaminersPrimary: Robinson, Ellis P.Attorney, Agent or FirmInternational ClassesC08F 212/00 (20060101)C08F 220/00 (20060101) C08F 212/32 (20060101) C08F 220/12 (20060101) H01L 31/0216 (20060101) AbstractPhotostable and weather stable absorping copolymers have been prepared from acrylic esters such as methyl methacrylate containing 0.1 to 5% of an 2-hydroxy-allyl benzophenone, preferably the 4,4' dimethoxy derivative thereof. The pendant benzophenone chromophores protect the acrylic backbone and when photoexcited do not degrade the ester side chain, nor abstract hydrogen from the backbone. | |
