Patents by Inventor Thomas D. Roberts

Thomas D. Roberts 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 the maleation of polyethylene waxes
    Patent number: 5551974
    Abstract: A process for the preparation of a maleated polyethylene wax is disclosed. This process entails mixing in the melt phase polyethylene, maleic anhydride, free radical initiator and a chain transfer agent m-di-isopropylbenzene. This process can be a continuous process either in a stirred reactor or twin screw extruder. The resulting maleated polyethylene wax has a high acid number, essentially no objectionable odor, and a Gardner color number less than 3.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: September 3, 1996
    Assignee: Eastman Chemical Company
    Inventors: Thomas D. Roberts, Kerry D. Muhlestein, Greg T. Slemons
  • Urea derivatives of maleated polyolefins
    Patent number: 5455304
    Abstract: Compositions are disclosed that are the urea derivatives of succinylated polyolefins (maleated polyolefins). The urea derivatives of succinylated polyolefins are of the formula; ##STR1## wherein R is a polyolefin attached at any point along the hydrocarbon chain. The urea derivative of succinylated polyolefins is useful as a coupling agent to couple polyolefins with dissimilar polymers having an excess of unreacted acid groups such as polyesters.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: October 3, 1995
    Assignee: Eastman Chemical Company
    Inventor: Thomas D. Roberts
  • Process for the maleation of polyethylene waxes
    Patent number: 5420303
    Abstract: A process for the preparation of a maleated polyethylene wax is disclosed. This process entails mixing in the melt phase polyethylene, maleic anhydride, free radical initiator and a chain transfer agent m-di-isopropylbenzene. This process can be a continuous process either in a stirred reactor or twin screw extruder. The resulting maleated polyethylene wax has a high acid number, essentially no objectionable odor, and a Gardner color number less than 3.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: May 30, 1995
    Assignee: Eastman Chemical Company
    Inventors: Thomas D. Roberts, Kerry D. Muhlestein, Greg T. Slemons
  • Urea derivatives of maleated polyolefins
    Patent number: 5393824
    Abstract: Compositions are disclosed that are the urea derivatives of succinylated polyolefins (maleated polyolefins). The urea derivatives of succinylated polyolefins are of the formula; ##STR1## wherein R is a polyolefin attached at any point along the hydrocarbon chain. The urea derivative of succinylated polyolefins is useful as a coupling agent to couple polyolefins with dissimilar polymers having an excess of unreacted acid groups such as polyesters.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: February 28, 1995
    Assignee: Eastman Chemical Company
    Inventor: Thomas D. Roberts
  • Urea derivatives of maleated polyolefins
    Patent number: 5384375
    Abstract: Compositions are disclosed that are the urea derivatives of succinylated polyolefins (maleated polyolefins). The urea derivatives of succinylated polyolefins are of the formula; ##STR1## wherein R is a polyolefin attached at any point along the hydrocarbon chain. The urea derivative of succinylated polyolefins is useful as a coupling agent to couple polyolefins with dissimilar polymers having an excess of unreacted acid groups such as polyesters.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: January 24, 1995
    Assignee: Eastman Kodak Company
    Inventor: Thomas D. Roberts
  • High clarity emulsions containing high melt viscosity maleated polypropylene wax
    Patent number: 5360862
    Abstract: A process is provided for the production of an emulsifiable polypropylene wax having a melt viscosity from 1000 to 5000 cP at 190.degree. C. This process entails reacting at a temperature below 190.degree. C. a thermally degraded polypropylene wax having a melt viscosity below 1000 cP (at 190.degree. C.) with maleic anhydride in the presence of a free radical source. Floor polish formulations containing this polypropylene wax are very clear but yet provide floor finishes that are very tough.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: November 1, 1994
    Assignee: Eastman Chemical Company
    Inventors: Thomas D. Roberts, Thomas W. Smith, Charlene A. Galvin
  • High clarity emulsions containing high melt viscosity maleated polypropylene wax
    Patent number: 5290954
    Abstract: A process is provided for the production of an emulsifiable polypropylene wax having a melt viscosity from 1000 to 5000 cP at 190.degree. C. This process entails reacting at a temperature below 190.degree. C. a thermally degraded polypropylene wax having a melt viscosity below 1000 cP (at 190.degree. C.) with maleic anhydride in the presence of a free radical source. Floor polish formulations containing this polypropylene wax are very clear but yet provide floor finishes that are very tough.
    Type: Grant
    Filed: August 13, 1992
    Date of Patent: March 1, 1994
    Assignee: Eastman Kodak Company
    Inventors: Thomas D. Roberts, Thomas W. Smith, Charlene A. Galvin