Antifreeze compositions

Details Antifreeze compositions Antifreeze compositions

C - Chemistry, Metallurgy

09

K

31/60

C09K 5/00 (2006.01) C09K 5/20 (2006.01) C23F 11/14 (2006.01) C23F 14/02 (2006.01)

Patent

CA 2017016

A-17588/=/MA 1963 Antifreeze compositions Abstract of the Disclosure The present invention provides a polyhydric alcohol antifreeze composition comprising A) as hard water deposition inhibitor, a hyclrolyzed copolymer of maleic anhydride with a mono-ethylenically unsaturated monomer, or mixture of monomers, the molar ratio of maleic anhydride to other monomers being from 2.5:1 to 100;1, and the molecular weight of the copolymer being below 1000; and optionally B) as corrosion inhibitor, at least one of B-l) a triazine compound having the formula (I): Image I wherein Z is a C1-C11 alkylene group, X is hydrogen, an alkali metal or mono-, di- or tri-ethanolamine, R1 and R2, independently, are hydrogen or methyl and R3 is a group -NR4R5 in which R4 is C1-C12 alkyl or -Z-COOX in which Z and X have their previous significance, and R5 is hydrogen or C1-C12 alkyl; B-2) 2-hydroxyphosphonoacetic acid; B-3) (2-Benzo- thiazolylthio)succinic acid and B-4) (2-benzothiazolylthio)-acetic acid.

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