Patents by Inventor Wei-Yang Su

Wei-Yang Su 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).

  • Preparation of aminotetramines
    Patent number: 4996294
    Abstract: A process in which an amine tetrol prepared by oxyalkylation of a propanediol with propylene oxide is catalytically aminated to provide, for example, an aminotetramine is disclosed. The aminotetramines are useful for preparing polyurea products and as curing agents for epoxy resins.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: February 26, 1991
    Assignee: Texaco Chemical Company
    Inventors: Michael Cuscurida, Wei-Yang Su, George P. Speranza
  • Catalyst for the preparation of linear polyethylenepolyamines and method of preparing the catalyst
    Patent number: 4983565
    Abstract: This invention is directed to novel phosphorus-free catalyst compositions based on titania pellets on which a minor amount of a tungstosilicic acid or a molybdosilicic acid is deposited. Also, the invention is directed to a process for preparing predominantly linear polyethylenepolyamines from ethylenediamine and monoethanolamine using the novel catalyst compositions.
    Type: Grant
    Filed: December 19, 1988
    Date of Patent: January 8, 1991
    Assignee: Texaco Chemical Company
    Inventors: John F. Knifton, Wei-Yang Su
  • Elastomeric polyamide hot melt adhesive from low molecular weight polyoxyethylene diamine
    Patent number: 4946933
    Abstract: Novel thermoplastic adhesive components prepared from polyoxyethylene diamines, dimer acids and dicarboxylic acids having a wide range of predictable softening points depending upon the molar ratio of the components. Especially interesting products are synthesized employing JEFFAMINE.RTM. EDR-148 and JEFFAMINE.RTM. EDR-192 produced by Texaco Chemical Co. The adhesives can be used as self adhesive materials or as tackifiers for other adhesives.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: August 7, 1990
    Assignee: Texaco Chemical Company
    Inventors: George P. Speranza, Wei-Yang Su
  • 1-isopropyl-2-methyl imidazole as an epoxy resin curative
    Patent number: 4931528
    Abstract: Disclosed is an epoxy resin curative exhibiting extended pot life, increased resistance to heat and chemicals, lower reactivity at ambient temperatures and increased reactivity at moderately elevated temperatures which comprises from 1 to 5 parts by weight of 1-isopropyl-2-methyl imidazole per 100 parts by weight epoxy resin. The latent reactive properties make the curative potentially useful in a variety of applications.
    Type: Grant
    Filed: May 8, 1989
    Date of Patent: June 5, 1990
    Assignee: Texaco Chemical Company
    Inventors: Harold G. Waddill, George P. Speranza, Wei-Yang Su
  • Method for the preparation of imidazoles
    Patent number: 4927942
    Abstract: This invention discloses an improvement in the method for preparation of imidazoles by dehydrogenation of imidazolines over a nickel catalyst comprising reacting the imidazoline over a nickel catalyst in combination with from 2 to 30 weight percent of a catalyst from the group consisting of copper, chromium or a combination of both at a temperature of 160.degree. C. to 250.degree. C. and a pressure of atmospheric to 500 psig.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: May 22, 1990
    Assignee: Texaco Chemical Co.
    Inventors: George P. Speranza, Wei-Yang Su
  • Method for the preparation of imidazoles
    Patent number: 4921969
    Abstract: This invention discloses an improved method for preparation of imidazoles without isolation of the imidazoline intermediate which comprises reacting a diamine with carboxylic acid and heating the mixture at a temperature of 140.degree.-300.degree. C. at a pressure of subatmospheric to about 10 atm to form an amide, passing the amide over a nickel-containing catalyst at a temperature of 180.degree. C. to 250.degree. C. and a pressure of atmospheric to 200 psig and isolating the imidazole.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: May 1, 1990
    Assignee: Texaco Chemical Co.
    Inventors: Wei-Yang Su, George P. Speranza
  • Process for preparing oxazine derivatives
    Patent number: 4910303
    Abstract: This invention relates to the reaction of N-alkyl-bis-(2-hydroxyalkyl)amines to form oxazine derivatives by a process comprising reacting said amines in the presence of a ruthenium-containing compound and hydrogen acceptor.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: March 20, 1990
    Assignee: Texaco Chemical Company
    Inventors: Wei-Yang Su, John F. Knifton
  • One Component polyurea
    Patent number: 4897430
    Abstract: One component mixtures of tri- and higher functional polyoxyalklyeneamines and aromatic polyisocyanates do not react or react only partially at room temperature and are cured by intimate mixing and heating. They are useful as caulks, sealants, and adhesives, for example.
    Type: Grant
    Filed: October 31, 1988
    Date of Patent: January 30, 1990
    Assignee: Texaco Chemical Company
    Inventors: George P. Speranza, Wei-Yang Su
  • Method for the production of N-methylpyrrolidine
    Patent number: 4892959
    Abstract: A method is disclosed for the improved production of N-methylpyrrolidine at moderate conditions which comprises the steps of reacting N-methylpyrrolidone with hydrogen over a copper chromite catalyst at a moderate temperature and a pressure of 1000 psig to 5000 psig and thereafter isolating the N-methylpyrrolidine by extraction with an aliphatic hydrocarbon solvent having a boiling point less than 70.degree. C. or greater than 90.degree. C.
    Type: Grant
    Filed: April 22, 1988
    Date of Patent: January 9, 1990
    Assignee: Texaco Chemical Co.
    Inventors: Donald H. Champion, John F. Knifton, Wei-Yang Su
  • Process for preparing pyrazines from hydroxyamines
    Patent number: 4788289
    Abstract: This invention relates to the cyclocondensation of hydroxyamines to form pyrazines by a process comprising reacting said hydroxyamine in the presence of a catalyst comprising a rhodium, ruthenium or palladium-containing compound and a phosphine-containing compound under mild conditions.
    Type: Grant
    Filed: October 24, 1986
    Date of Patent: November 29, 1988
    Assignee: Texaco Inc.
    Inventors: Wei-Yang Su, John F. Knifton
  • Process for preparing N-substituted piperazines from ethylene glycol and amines
    Patent number: 4774336
    Abstract: N,N'-dialkylpiperazines are prepared by contacting ethylene glycol and a primary amine in the presence of a homogeneous ruthenium-phosphine catalyst. For example, ethylene glycol and aniline are reacted in the presence of ruthenium trichloride and triphenylphosphine to produce N,N'-diphenylpiperazine.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: September 27, 1988
    Assignee: Texaco Inc.
    Inventor: Wei-Yang Su
  • Process for preparing hydroxymorpholines
    Patent number: 4670557
    Abstract: This invention relates to the reaction of aliphatic epoxides and primary amines to form hydroxymorpholines or morpholines by a process comprising reacting said epoxide and primary amine in the presence of a ruthenium-containing compound plus a tertiary phosphine.
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: June 2, 1987
    Assignee: Texaco Inc.
    Inventor: Wei-Yang Su