The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 31, 1991
Filed:
May. 14, 1990
Peter Miles, Bramhall, GB;
Upendra P Gandhi, Bramhall, GB;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
The present invention provides a polyhydric alcohol antifreeze composition comprising A) as hard water deposition inhibitor, a hydrolyzed 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-1) a triazine compound having the formula (I): ##STR1## wherein Z is a C.sub.1 -C.sub.11 alkylene group, X is hydrogen, an alkali metal or mono-, di- or tri-ethanolamine, R.sub.1 and R.sub.2, independently, are hydrogen or methyl and R.sub.3 is a group --NR.sub.4 R.sub.5 in which R.sub.4 is C.sub.1 -C.sub.12 alkyl or --Z--COOX in which Z and X have their previous significance, and R.sub.5 is hydrogen or C.sub.1 -C.sub.12 alkyl; B-2) 2-hydroxyphosphonoacetic acid; B-3) (2-Benzo-thiazolylthio)succinic acid and B-4) (2-benzothiazolylthio)-acetic acid.