Patent ID: 9458369
Filing Date: 2016-10-04
CPC Classification: C09K,C23F,F01P

Claim Text:
1. An antifreeze concentrate, comprising: (A) at least one freezing point-lowering liquid selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, a polyhydroxy alcohol, and ethers thereof as a main constituent; (B) at least one sulfur-comprising aliphatic carboxylic acid selected from the group consisting of 2,2-mercaptodiacetic acid (thiobenzoylthio)acetic acid, a 2-hydroxyalkyl carboxylalkyl sulfide, a 2-hydroxyalkyl carboxylalkyl sulfoxide, and their alkali metal, ammonium and substituted ammonium salts as a corrosion inhibitor; (C) at least one inorganic molybdate salt as a further corrosion inhibitor; (D) at least one inorganic phosphate salt as a further corrosion inhibitor; (E) at least one acid selected from the group consisting of an aliphatic monocarboxylic acid, an aliphatic tricarboxylic acid, a cycloaliphatic monocarboxylic acid, a cycloaliphatic tricarboxylic acid, an aromatic monocarboxylic acid, an aromatic tricarboxylic acid, a cycloaliphatic monocarboxylic acid, a cycloaliphatic dicarboxylic acid, a cycloaliphatic tricarboxylic acid, an aromatic monocarboxylic acid, and an aromatic dicarboxylic acid, and an aromatic tricarboxylic acid, wherein the least one acid is in the form of an alkali metal, ammonium or substituted ammonium salt thereof having from 3 to 21 carbon atoms in the acid part.