Patents by Inventor Miguel Prado

Miguel Prado 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).

  • Process for improving the color of selectively hydrogenated block copolymers modified with acid compounds or derivatives
    Patent number: 5405914
    Abstract: A process for improving the color of selectively hydrogenated block copolymers modified with acid compound or derivatives thereof which comprises:(a) anionically polymerizing at least one conjugated diene, and, optionally, at least one vinyl aromatic hydrocarbon, to produce a block copolymer,(b) selectively hydrogenating the block copolymer,(c) subjecting the block copolymer to an acid wash,(d) subjecting the acid washed block copolymer to high efficiency water washing at a residence time of not less than 50 minutes and a water to polymer cement weight ratio of more than 0.2, and(e) grafting an acid compound or a derivative thereof onto the block copolymer.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: April 11, 1995
    Assignee: Shell Oil Company
    Inventor: Miguel Prado
  • Color prevention in titanium catalyzed hydrogenated diene polymers
    Patent number: 5280058
    Abstract: The present invention is an improvement upon a process for hydrogenating a diene polymer by contacting the polymer in the presence of hydrogen with a titanium hydrogenation catalyst. The improvement comprises preventing discoloration of the hydrogenated polymer by treating it with water, a peroxide or alcohol in the absence of oxygen and adding a non-phenolic antioxidant to the polymer.
    Type: Grant
    Filed: April 16, 1993
    Date of Patent: January 18, 1994
    Assignee: Shell Oil Company
    Inventors: Linda R. Chamberlain, Carma J. Gibler, Miguel Prado
  • Color prevention in titanium catalyzed hydrogenated diene polymers
    Patent number: 5280059
    Abstract: The present invention is an improvement upon a process for hydrogenating a diene polymer by contacting the polymer in the presence of hydrogen with a titanium hydrogenation catalyst. The improvement comprises preventing discoloration of the hydrogenated polymer by treating it with water, a peroxide or alcohol in the absence of oxygen and adding a non-phenolic antioxidant to the polymer.
    Type: Grant
    Filed: April 16, 1993
    Date of Patent: January 18, 1994
    Assignee: Shell Oil Company
    Inventors: Linda R. Chamberlain, Carma J. Gibler, Miguel Prado
  • Color prevention in titanium catalyzed hydrogenated diene polymers
    Patent number: 5242961
    Abstract: The present invention is an improvement upon a process for hydrogenating a diene polymer by contacting the polymer in the presence of hydrogen with a titanium hydrogenation catalyst. The improvement comprises preventing discoloration of the hydrogenated polymer by treating it with water, a peroxide or alcohol in the absence of oxygen and adding a non-phenolic antioxidant to the polymer.
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: September 7, 1993
    Assignee: Shell Oil Company
    Inventors: Linda R. Chamberlain, Carma J. Gibler, Miguel Prado