Patents by Inventor Chi-Wen F. Cheng

Chi-Wen F. Cheng 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).

  • Patent number: 5239093
    Abstract: The present invention relates to the preparation of di-secondary alcohols comprising the reaction of an alcohol and a diglycidyl ether of a dihydric phenol in the presence of a catalyst of the formula (IV):MX (IV)wherein M is a metal from Groups IB to VIIIB or a metal or metalloid from Groups IIA to VA of the Periodic Chart of Elements or an ammonium ion or H.sup.+ or a hydronium ion and X is an anion selected from the group consisting of BF.sub.4.sup.-, PF.sub.6.sup.-, AsF.sub.6.sup.-, SbF.sub.6.sup.-, AlF.sub.4.sup.-, TiF.sub.6.sup.2-, SiF.sub.6.sup.2- and ZrF.sub.6.sup.2- to produce the di-secondary alcohol, which can then be subjected to glycidylation to produce a glycidyl ether; orthe reaction of an alcohol or diol and epichlorohydrin in the presence of the foregoing catalyst, followed by ring closure employing an alkali to produce a mono- or polyglycidyl ether.
    Type: Grant
    Filed: August 14, 1992
    Date of Patent: August 24, 1993
    Assignee: Ciba-Geigy Corporation
    Inventor: Chi-Wen F. Cheng
  • Patent number: 5128491
    Abstract: The present invention relates to a process for the preparation of a glycidyl ether of a di-secondary alcohol with a monomer content of about 80% to about 90% of the formula (I) ##STR1## comprising the steps of: (a) reacting a di-secondary alcohol of the formula (II) ##STR2## with epichlorohydrin in the presence of an alkali and a phase transfer catalyst to produce a glycidyl ether with a monomer content of about 60% to about 75%; and(b) reacting said glycidyl ether with a monomer content of about 60% to about 75% with epichlorohydrin in the presence of an alkali and benzyltrimethylammonium chloride to produce a glycidyl ether of a di-secondary alcohol with a monomer content of about 80% to about 90%.
    Type: Grant
    Filed: July 30, 1991
    Date of Patent: July 7, 1992
    Assignee: Ciba-Geigy Corporation
    Inventor: Chi-Wen F. Cheng
  • Patent number: 5117010
    Abstract: The present invention relates to the preparation of di-secondary alcohols comprising the reaction of an alcohol and a diglycidyl ether of a dihydric phenol in the presence of a catalyst of the formula (IV):MX (IV)wherein M is a metal from Groups IB to VIIIB or a metal or metalloid from Groups IIA to VA of the Periodic Chart of Elements or an ammonium ion and X is an anion selected from the group consisting of BF.sub.4.sup.-, PF.sub.6.sup.-, AsF.sub.6.sup.-, SbF.sub.6.sup.-, AlF.sub.4.sup.-, TiF.sub.6.sup.2-, SiF.sub.6.sup.2-, and ZrF.sub.6.sup.2- to produce the di-secondary alcohol, which can then be subjected to glycidylation to produce a glycidyl ether, orthe reaction of an alcohol, glycol or polyol and epichlorohydrin in the presence of the foregoing catalyst, followed by ring closure employing an alkali to produce a mono- or polyglycidyl ether. The monoglycidyl ether can be further reacted with a dihydric phenol to produce a di-secondary alcohol which is then glycidylized to produce a glycidyl ether.
    Type: Grant
    Filed: August 15, 1991
    Date of Patent: May 26, 1992
    Assignee: Ciba-Geigy Corporation
    Inventor: Chi-Wen F. Cheng
  • Patent number: 5097006
    Abstract: Carboxyl-terminated and hydroxyl-terminated aliphatic polyester compositions derived from 1,4-cyclohexane-dicarboxylic acid, and a glycol component comprising primarily of cycloaliphatic diols and modifying aliphatic glycols, said polyesters being optionally stabilized by the presence of ultraviolet light absorbing compounds and/or hindered amine light stabilizers and being used in powder coating formulations to provide improved weatherability thereto.
    Type: Grant
    Filed: November 21, 1990
    Date of Patent: March 17, 1992
    Assignee: U C B S.A.
    Inventors: Lorraine Kapilow, Joseph S. Puglisi, Chi-Wen F. Cheng