Patents Examined by T. McDonald, Jr.
  • Patent number: 4889895
    Abstract: Magnetic recording media have been made with a new class of binder resins having the formula ##STR1## wherein the portion of the copolymer having the a subscript comprises 50 to 97 weight percent of the copolymer, the portion of the copolymer having the b subscript comprises 0 to 30 weight percent of the copolymer, the portions of the copolymer having the c and d subscripts combinec comprise, 0.1 to 20 weight percent of the copolymer, while d can be 0,R.sub.1 is an alkyl group selected from --CH.sub.3 and --(CH.sub.2).sub.n1 CH.sub.3 wherein n1=1-10,R.sub.2 is an alkylene group which may be --CH.sub.2).sub.n1 or --CH.sub.2).sub.n2 (CH)(CH.sub.2).sub.n3 CH.sub.3, n2=1-4 and n3=0-4,R.sub.3 may be selected from --H and --CH.sub.3, n5=0 or 1, and X is a linking group which is stable under electron beam irradiation and may be, for example, ##STR2## R.sub.4 =C1-6 alkylene, for example, with the proviso that when d=0, there is at least one additional polymer in the binder.
    Type: Grant
    Filed: August 8, 1988
    Date of Patent: December 26, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: John G. Chernega, John A. Martens, Roger A. Olsen, Auburn B. Cottingham, deceased
  • Patent number: 4889884
    Abstract: This invention presents a series of synthetic based cold seal adhesives which are capable of forming a strong bonds at room temperature, yet which may be reeled up without blocking and stored for extended periods of time. Such adhesives can be used in place of the natural rubber based cold seal adhesives currently used, and thus, can be employed in any packaging application where cold seal properties are desirable.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: December 26, 1989
    Assignee: National Starch and Chemical Corporation
    Inventors: Richard A. Dust, Peter Causton
  • Patent number: 4886872
    Abstract: A polymer having a weight average molecular weight ranging from between about 1,000 to about 10,000,000 which polymer contains at least 5 mole percent of a pendant functional group represented by: ##STR1## and mixtures thereof; wherein R' is chosen from the group consisting of H, and lower linear or branched alkyl groups containing from one to six carbon atoms; and X is an anionic gegenion, present in an electroneutralizing amount.
    Type: Grant
    Filed: May 22, 1989
    Date of Patent: December 12, 1989
    Assignee: Nalco Chemical Company
    Inventors: Dodd W. Fong, Josepha M. Fu
  • Patent number: 4883843
    Abstract: The invention relates to a method of producing imide bond-containing resins and flame retardants comprising such resins. The method comprises subjecting a halogenated phthalic anhydride, a specific copolymer and a diamine to dehydration reaction in an inert solvents to give an imide bond-containing resin. The resins provide flammable substances with good fire or flame resistance and at the same time themselves have good heat resistance and weather resistance. Therefore, the flame retardants comprising these resins have a wide field of application.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: November 28, 1989
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Akira Taniuchi, Hirohito Komori, Koichi Niwa
  • Patent number: 4868248
    Abstract: Polyacrylic acid polymers are modified with hydroxylamine to convert a portion of the acrylic acid groups in the polymer to hydroxamic acid groups. The process requires utiization of a pH between 1-6 and a temperature ranging between 70.degree.-150.degree. C.
    Type: Grant
    Filed: March 22, 1989
    Date of Patent: September 19, 1989
    Assignee: Nalco Chemical Company
    Inventors: John W. Sparapany, Dodd W. Fong, Josepha M. Fu