Patents by Inventor Simon M. Li

Simon M. Li 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 preparing tetraphenolic compounds
    Patent number: 5191128
    Abstract: Tetraphenolic compounds such as the tetraphenol of ethane and the tetraphenol of xylene can be prepared in a ketone/alcohol solvent medium using a cation exchange resin catalyst.
    Type: Grant
    Filed: March 12, 1992
    Date of Patent: March 2, 1993
    Assignee: Shell Oil Company
    Inventor: Simon M. Li
  • Process for preparing tetraphenoic compounds
    Patent number: 5146006
    Abstract: A process is disclosed for preparing a tetrakisphenol by the reaction of a dialdehyde with a phenolic compound in the presence of a cationic exchange resin catalyst, and then subjecting a solution of the condensation product to conditions suitable for crystallization of the polyphenolic product relatively high in the tetrakisphenol species.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: September 8, 1992
    Assignee: Shell Oil Company
    Inventor: Simon M. Li
  • Process and alkylmercaptoamine catalyst for production of bisphenol-A
    Patent number: 5075511
    Abstract: Bisphenol-A is prepared by reacting an excess of phenol with acetone in the presence of a modified sulfonic acid cationic exchange resin catalyst having a plurality of sulfonic acid sites of the general formula ##STR1## in which IER represents the ionic exchange resin backbone, each a and b is an integer from 0 to about 5, and each R is selected independently from H, OH, SH and alkyl groups. The catalyst exhibits high activity and selectivity at moderate reaction temperatures, low production of colored impurities, and high stability.
    Type: Grant
    Filed: June 19, 1990
    Date of Patent: December 24, 1991
    Assignee: Shell Oil Company
    Inventor: Simon M. Li
  • Isomerization of bis-phenols
    Patent number: 5001281
    Abstract: Bis-phenols are isomerized in the presence of an acidic perfluorinated polymer catalyst.
    Type: Grant
    Filed: August 11, 1989
    Date of Patent: March 19, 1991
    Assignee: Shell Oil Company
    Inventor: Simon M. Li
  • Preparation of bis(p-aminocumyl)benzenes
    Patent number: 4973754
    Abstract: Bis(p-aminocumyl)benzenes are prepared by treating diisopropylbenzene derivatives with a primary or secondary aniline in the presence of a catalytic amount of an acidic perfluorinated polymer.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: November 27, 1990
    Assignee: Shell Oil Company
    Inventor: Simon M. Li
  • Isomerization of by-products of bi-phenol synthesis
    Patent number: 4825010
    Abstract: By-products of bis-phenol synthesis are isomerized in the presence of a mercapto modified cation exchange resin catalyst.
    Type: Grant
    Filed: October 19, 1987
    Date of Patent: April 25, 1989
    Assignee: Shell Oil Company
    Inventor: Simon M. Li
  • Isomerization of by-products of bis-phenol synthesis
    Patent number: 4822923
    Abstract: By-products of bis-phenol synthesis are isomerized in the presence of an acid catalyst and a free mercaptan co-catalyst.
    Type: Grant
    Filed: October 19, 1987
    Date of Patent: April 18, 1989
    Assignee: Shell Oil Company
    Inventor: Simon M. Li
  • Process and catalyst for production of bisphenol-A
    Patent number: 4820740
    Abstract: Bisphenol-A is prepared by reacting an excess of phenol with acetone in the presence of a modified sulfonic acid cationic exchange resin catalyst having a plurality of sulfonic acid sites of the general formula ##STR1## in which IER represnts the ionic exchange backbone, each a and b is an integer from 9 to about 5, and each R is selected independently from H, OH, Sh and alkyl groups. The catalyst exhibits high activity and selectively at moderate reaction temperatures, low production of colored impurities, and high stability.
    Type: Grant
    Filed: October 30, 1986
    Date of Patent: April 11, 1989
    Assignee: Shell Oil Company
    Inventor: Simon M. Li
  • Process for preparation of low-dusting epoxy curing agents based on trimellitic anhydride
    Patent number: 4490511
    Abstract: The invention provides a low-dusting anhydride curing agent blend for epoxy resins comprising a solid acid anhydride (trimellitic anhydride) and a normally liquid acid anhydride (methyl hexahydrophthalic anhydride. The invention further provides processes for preparing the anhydride blends and to curable epoxy compositions thereof.
    Type: Grant
    Filed: February 28, 1984
    Date of Patent: December 25, 1984
    Assignee: Shell Oil Company
    Inventors: Simon M. Li, Fred R. Lemley