Patents by Inventor Roland P. F. Scharrer

Roland P. F. Scharrer 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).

  • High shear tackifier resins
    Patent number: 4959412
    Abstract: A method for the preparation of an adhesive with an improved high temperature shear strength is disclosed. The method comprises the steps of blending a styrene homopolymer with a tackifier resin to form a resin blend and combining the resin blend with an elastomer. An adhesive with improved high temperature shear strength is also disclosed.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: September 25, 1990
    Assignee: Arizona Chemical Company
    Inventors: William J. Arter, Wayne K. Chu, Erwin R. Ruckel, Roland P. F. Scharrer
  • Method for making oxidation-stable, light-colored glycerol ester of modified rosin
    Patent number: 4447354
    Abstract: Glycerol esters of modified rosin are useful tackifiers in rubber adhesive compositions. Esters made with rosin modified by reducing the abietic acid concentration to 5% or less, will retain tackifying properties for longer periods in storage before use. The esters are prepared by simultaneously disproportionating and esterifying unmodified rosin with glycerol in the presence of p-t-amyl phenol and phosphoric acid, for example.
    Type: Grant
    Filed: March 21, 1983
    Date of Patent: May 8, 1984
    Assignee: Arizona Chemical Company
    Inventors: Roland P. F. Scharrer, Robert W. Schluenz, Richard H. Kramss
  • Oxygen-stable rosin-primary polyhydric aliphatic alcohol esters and a method for preparing the same utilizing arylsulfonic acid catalysis
    Patent number: 4172070
    Abstract: There are provided oxygen stable rosin-primary polyhydric alcohol esters and a process for esterifying a rosin with a primary polyhydric alcohol in the presence of catalytic amounts of an arylsulfonic acid added either simultaneously or subsequent to the initial rosin-polyhydric alcohol reaction to complete esterification and to obtain a rosin ester having markedly improved oxidation stability and good color.
    Type: Grant
    Filed: April 24, 1978
    Date of Patent: October 23, 1979
    Assignee: Arizona Chemical Company
    Inventors: Roland P. F. Scharrer, Martin Epstein