Patents Assigned to Katayama Chemical Works Ltd.
  • Scale inhibitor
    Patent number: 4814406
    Abstract: A scale inhibitor containing as its active component a copolymer comprising acrylic acid, methacrylic acid and a C.sub.1-8 alkyl ester of (meth)acrylic acid, the copolymer being(a) about 1:4 to about 4:1 in the copolymerization mole ratio of acrylic acid to methacrylic acid,(b) about 2:1 to about 40:1 in the copolymerization mole ratio of a total amount of acrylic acid and methacrylic acid to the C.sub.1-8 alkyl ester of (meth) acrylic acid, and(c) about 500 to about 15,000 in average molecular weight.
    Type: Grant
    Filed: February 18, 1987
    Date of Patent: March 21, 1989
    Assignee: Katayama Chemical Works Ltd.
    Inventors: Sakae Katayama, Tadahiko Asano, Masatsune Okuma, Keisyo Nakanishi