Resin Bleach Patents (Class 8/DIG6)
  • Bisstyrylaryl compounds
    Patent number: 4009193
    Abstract: Bisstyryl-substituted aryl compounds of the formula (I): ##STR1## where X is arylene and R.sup.1 and R.sup.5 are substituents common to the dye art. The compounds are useful as optical brighteners, particularly for acrylonitrile polymers, and give excellent whitening having good fastness properties.
    Type: Grant
    Filed: December 12, 1974
    Date of Patent: February 22, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Horst Scheuermann, Walter Stilz
  • Process for modifying glycol terephthalate polyesters to contain CH.sub.2 - - .sub.2 --N linkages
    Patent number: 3991035
    Abstract: Glycol terephthalate polyesters are modified to contain CH.sub.2 --S or CH.sub.2 --N linkages in molecular chains of the polyester, staple fibers of good strength are prepared from the modified polyesters, fabrics are prepared from the fibers and then treated with hypochlorous acid to develop pilling resistance. The treatment cleaves polyester molecules at the CH.sub.2 --S or CH.sub.2 --N links. Precise control is provided by the amount of modifier used and the relative viscosity of the fibers before the treatment.
    Type: Grant
    Filed: July 9, 1975
    Date of Patent: November 9, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Evan Franklin Evans