Involving Precursor Of An Ultraviolet Absorber, E.g., Monobenzoate, Etc. Patents (Class 522/907)
  • Plastic castings molds
    Patent number: 6821108
    Abstract: The invention is concerned with the problem that with known plastic casting moulds, especially those of polypropylene, the lenses produced with these moulds have a slippery surface. The invention solves this problem through the use of polymers which are notable for their very low oxygen permeability.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: November 23, 2004
    Assignee: Novartis AG
    Inventors: Peter Hagmann, Axel Heinrich, Willi Hoerner, Robert Allen Janssen, John Martin Lally, Robert Earl Szokolay, Bernhard Seiferling
  • Plastic casting molds
    Patent number: 6638451
    Abstract: The invention is concerned with the problem that with known plastic casting molds, especially those of polypropylene, the lenses produced with these molds have a slippery surface. The invention solves this problem through the use of polymers which are notable for their very low oxygen permeability.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: October 28, 2003
    Assignee: Novartis AG
    Inventors: Peter Hagmann, Axel Heinrich, Willi Hoerner, Robert Allen Janssen, John Martin Lally, Robert Earl Szokolay, Bernhard Seiferling
  • Light-sensitive resin composition
    Patent number: 5663212
    Abstract: A light-sensitive resin composition which can be developed in an alkaline aqueous solution and has an excellent image-forming performance and a sufficient UV absorbance after an image formation is disclosed. The light-sensitive resin composition includes (1) a photopolymerization initiator or a photopolymerization initiator system, (2) an addition-polymerizable monomer having an ethylenically unsaturated double bond, (3) a high molecular binder which is soluble in an alkaline aqueous solution and insoluble in water, and (4) at least one of the compounds which substantially do not absorb light in a specified UV region and which, when subjected to treatment with an aqueous alkali solution and/or to heating, are capable of absorbing light in that region and have substantially no absorption in the visible region.
    Type: Grant
    Filed: February 4, 1994
    Date of Patent: September 2, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yuichi Wakata, Morimasa Sato, Ken Iwakura, Yuuichi Fukushige
  • Photocurable acrylic composition, and U.V. curing with development of U.V. absorber
    Patent number: 5141990
    Abstract: In-situ development of an ultraviolet absorber is provided by a compound such as a hydroxy-phenyl-triazole containing a group which protects the absorber during actinically activated polymerization by light at first frequency. After polymerization the protective group is removed by actinic reaction at a second frequency lower than the first frequency. The protective group is formed by replacing the hydrogen of the hydroxyl group with an acyl group containing 1 to 3 carbon atoms or an acryloxy group of the formula: ##STR1## where R.sup.1 is either an alkyl containing 1 to 6 carbon atoms or --CH.dbd.CH.sub.2.
    Type: Grant
    Filed: October 25, 1989
    Date of Patent: August 25, 1992
    Assignee: California Institute of Technology
    Inventors: Vincent B. McKoy, Amitava Gupta
  • Internal stabilization of polycarbonate resins by two stage radiation process
    Patent number: 4749726
    Abstract: A new polycarbonate copolymer resin is formed by internal generation of stabilizers bound to the polymer chain. Irradiation of a solid piece or a deoxygenated solution of the resin at a first frequency below 300 nm generates 2 to 8 mol percent of phenyl salicylate groups which are rearranged to dihydroxybenzophenone groups by irradiating the resin under oxygen excluding conditions at a second frequency from 300 to 320 nm.
    Type: Grant
    Filed: December 8, 1986
    Date of Patent: June 7, 1988
    Assignee: California Institute of Technology
    Inventors: Amitava Gupta, Ranty H. Liang, Andre H. Yavrouian