Patents by Inventor D. Bruce Evans

D. Bruce Evans 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).

  • Rosin/hydrocarbon resin size for paper
    Patent number: 6273997
    Abstract: Discloses is a method for sizing paper at a pH of about 5.0 to about 8.5 by incorporating a sizing composition consisting essentially of (a) rosin, (b) at least one hydrocarbon resin, (c) a cationic component consisting essentially of a cationic polyamine resin at a weight ration of the rosin/hydrocarbon resin blend to cationic polyamine of about 5:1 to about 1:2, and (d) up to 0.3% alum. The cationic polyamine resin is selected from the group consisting of polyalkyleneamine-epihalohydrin resins, polyalkyleneamine-dicyandiamide-epihalohydrin resins, poly(diallylamine•HCl)-epihalohydrin resins, poly(methyldiallylamine•HCl)-epihalohydrin resins, epihalohydrin-modified polyethyleneimine resins, amine-modified poly(methyldiallylamine•HCl)-epihalohydrin resins, and mixtures thereof.
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: August 14, 2001
    Assignee: Hercules Incorporated
    Inventors: Susan M. Ehrhardt, D. Bruce Evans
  • Rosin sizing at neutral to alkaline pH
    Patent number: 6228219
    Abstract: Disclosed is a method for sizing paper at a pH of about 5.0-8.5 by incorporating a sizing composition consisting essentially of (1) rosin, (2) a cationic polyamine resin at a weight ratio of rosin to cationic polyamine of about 5:1 to about 1:2, and (3) up to 0.3% alum. The cationic polyamine resin is selected from the group consisting of polyalkyleneamine-epihalohydrin resins, polyalkyleneamine-dicyandiamide-epihalohydrin resins, poly(diallylamine.HCl)-epihalohydrin resins, poly(methyldiallylamine.HCl)-epihalohydrin resins, epihalohydrin-modified polyethyleneimine resins, amine-modified poly(methyldiallylamine.HCl)-epihalohydrin resins and mixtures thereof.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: May 8, 2001
    Assignee: Hercules Incorporated
    Inventors: Susan M. Ehrhardt, D. Bruce Evans
  • Rosin sizing at neutral to alkaline pH
    Patent number: 6033526
    Abstract: Disclosed is a method for sizing paper at a pH of about 5.0-8.5 by incorporating a sizing composition consisting essentially of (1) rosin, (2) a cationic polyamine resin at a weight ratio of rosin to cationic polyamine of about 5:1 to about 1:2, and (3) up to 0.3% alum. The cationic polyamine resin is selected from the group consisting of polyalkyleneamine-epihalohydrin resins, polyalkyleneamine-dicyandiamide-epihalohydrin resins, poly(diallylamine.HCl)-epihalohydrin resins, poly(methyldiallylamine.HCl)-epihalohydrin resins, epihalohydrin-modified polyethyleneimine resins, amine-modified poly(methyldiallylamine.HCl)-epihalohydrin resins and mixtures thereof.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: March 7, 2000
    Assignee: Hercules Incorporated
    Inventors: Susan M. Ehrhardt, D. Bruce Evans