Patents Assigned to B. R. Chemical Co., Ltd.
  • Method for using macroamine polymers as flocculating agents
    Patent number: 3969239
    Abstract: A method for using a macroamine polymer as a flocculating agent, said polymer having a structural unit shown by the following formula: ##EQU1## wherein R represents an alkyl group containing 1 to 4 carbon atoms, x is a mol decimal fraction between about 0.65 and 0.95, and y is a mol decimal fraction between about 0.23 and 0.04. Said polymer can be obtained by reacting polyvinyl bromide with an N-monoalkylaniline having 1 to 4 carbon atoms in the alkyl group.
    Type: Grant
    Filed: July 9, 1975
    Date of Patent: July 13, 1976
    Assignee: B. R. Chemical Co., Ltd.
    Inventors: Isao Shinohara, Juro Aoyagi
  • Water soluble linear macroamine polymers and method of producing them
    Patent number: 3933717
    Abstract: A novel macroamine polymer particularly useful as a flocculating agent, said polymer having a structural unit shown by the following formula: ##EQU1## wherein R represents an alkyl group containing 1 to 4 carbon atoms, x is a mol decimal fraction between about 0.65 and 0.95, and y is a mol decimal fraction between about 0.23 and 0.04. Said polymer can be obtained by reacting polyvinyl bromide with an N-monoalkylaniline having 1 to 4 carbon atoms in the alkyl group.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: January 20, 1976
    Assignee: B. R. Chemical Co., Ltd.
    Inventors: Isao Shinohara, Juro Aoyagi