Propane-1,3-diphosphonic acids for conditioning water

US4246103A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Dieter Block · Cologne, DE
• Herbert Kallfass
• Roland Kleinstuck · Bensberg, DE

Key dates

• Filing date: Feb 28, 1979
• Grant date: Jan 20, 1981
• Expiry date: Feb 28, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23F11/1676
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Water is conditioned by adding thereto a corrosion-inhibiting, concretion inhibiting, precipitation retarding, deflocculating, dispersing or fluidifying amount of an acid of the formula ##STR1## in which R.sup.1 and R.sup.2, independently of one another, represent hydrogen where a or b=1, or where a or b=0 represent an optionally substituted alkyl radical with 1-8 carbon atoms or an optionally substituted phenyl radical, PA1 R.sup.3 represents hydrogen, an optionally substituted alkyl radical with 1 to 4 carbon atoms, an optionally substituted phenyl radical, a halogen atom from the group comprising fluorine, chlorine and bromine, a hydroxyl group, an alkoxy group containing 1 to 8 carbon atoms, a carboxyl group or a group --P(O)--(O).sub.a --R.sup.1 OH, PA1 R.sup.4 represents hydrogen, an alkyl radical with 1 to 4 carbon atoms, an alkenyl radical with up to 3 carbon atoms, an optionally substituted phenyl radical, a carboxyl group, a fluorine or chlorine atom or a group --P(O)--(O).sub.a --R.sup.1 OH, or PA1 R.sup.3 and R.sup.4 together form a ring bridge with 3 to 5 methylene groups, PA1 R.sup.5 represents hydrogen, an optionally substituted alkyl radical with 1 to 4 carbon atoms…