Patents by Inventor Steven M. Evans

Steven M. Evans has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Storage stable heat curable organosiloxane compositions containing a microencapsulated catalyst and method for preparing said catalyst
    Patent number: 5279898
    Abstract: The present invention provides microencapsulated hydrosilylation catalysts for one-part heat curable organosiloxane compositions. Compositions containing these exhibit long-term storage stability yet cure rapidly when heated above the melting point of the encapsulating polymer. At least a portion of these microcapsules are less than one micron in diameter, and substantially all are less than about three microns in diameter. Compositions containing the preferred platinum group metals as catalysts are optically transparent.The microencapsulated curing catalysts of this invention are prepared by irradiating with UV light in the wavelength range of from 300 to 400 nanometers a solution containing (1) at least one of a specified group of photocrosslinkable organosiloxane compounds derived from propargyl esters of carboxylic acids containing a terminal aromatic hydrocarbon radical and at least two ethylenically unsaturated carbon atoms and (2) a liquid or solubilized hydrosilylation catalyst.
    Type: Grant
    Filed: January 7, 1993
    Date of Patent: January 18, 1994
    Assignee: Dow Corning Corporation
    Inventors: Steven M. Evans, Chi-Long Lee, Ming-Hsiung Yeh
  • Storage stable heat curable organosiloxane compositions containing a microencapsulated catalyst and method for preparing said catalyst
    Patent number: 5194460
    Abstract: The present invention provides microencapsulated hydrosilylation catalysts for one-part heat curable organosiloxane compositions. Compositions containing these exhibit long-term storage stability yet cure rapidly when heated above the melting point of the encapsulating polymer. At least a portion of these microcapsules are less than one micron in diameter, and substantially all are less than about three microns in diameter. Compositions containing the preferred platinum group metals as catalysts are optically transparent.The microencapsulated curing catalysts of this invention are prepared by irradiating with UV light in the wavelength range of from 300 to 400 nanometers a solution containing (1) at least one of a specified group of photocrosslinkable organosiloxane compounds derived from propargyl esters of carboxylic acids containing a terminal aromatic hydrocarbon radical and at least two ethylenically unsaturated carbon atoms and (2) a liquid or solubilized hydrosilylation catalyst.
    Type: Grant
    Filed: January 2, 1992
    Date of Patent: March 16, 1993
    Assignee: Dow Corning Corporation
    Inventors: Steven M. Evans, Chi-Long Lee, Ming-Hsiung Yeh