Patents by Inventor Jerald A. Griggs

Jerald A. Griggs 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).

  • Polymerization process and initiator system therefor
    Patent number: 5057583
    Abstract: Narrow molecular weight telechelic and/or block copolymers are prepared by anionic polymerization using multifunctional lithium initiator in combination with a C.sub.2-16 lithium alkoxide.
    Type: Grant
    Filed: October 2, 1989
    Date of Patent: October 15, 1991
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Jerald A. Griggs
  • Block copolymers utilizing a mixture of cis and trans-isomers of 1,3-pentadiene
    Patent number: 4631314
    Abstract: Block copolymers having two or more blocks may be prepared from vinyl-substituted aromatic hydrocarbons and a mixed isomer mixture of 1,3-pentadiene. At least one block is polymerized from the cis and trans-isomer mixture of 1,3-pentadiene. The amount of the mixed isomer mixture of 1,3-pentadiene polymerized may be increased by including in the mixed isomer mixture a cis-isomer polymerization promoter.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: December 23, 1986
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Jerald A. Griggs
  • Process for the polymerization of mixtures of cis and trans-isomers of 1,3-pentadiene in the production of block copolymers
    Patent number: 4631313
    Abstract: An improved method for the polymerization of mixtures of mixed cis and trans-isomers of 1,3-pentadiene in the production of block copolymers. By continuously or incrementally adding a cis-isomer of 1,3-pentadiene polymerization promoter, using a hydrocarbon solvent with no aprotic solvents of a polar nature and not exceeding specified temperature ranges, the cis-isomer of 1,3-pentadiene is polymerized, resulting in a greater 1,3-pentadiene polymerization yield. The polymerization promoter is a vinyl-substituted aromatic monomer, for example styrene.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: December 23, 1986
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Jerald A. Griggs
  • Impact resistant .alpha.-methylstyrene-styrene copolymer blends
    Patent number: 4525532
    Abstract: .alpha.-Methylstyrene-styrene copolymer is blended with an .alpha.-methylstyrene-styrene diene block copolymer or copolymers to provide impact resistant molding material.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: June 25, 1985
    Assignee: The Dow Chemical Company
    Inventors: Lu H. Tung, Grace Y. Lo, Jerald A. Griggs