Compositions – Preservative agents – Anti-corrosion
Patent
1988-11-09
1991-05-21
Stoll, Robert L.
Compositions
Preservative agents
Anti-corrosion
562 20, C07F 909
Patent
active
050173065
ABSTRACT:
A method of preparing phosphonate compositions comprising di-(phosphonomethyl) formal is disclosed which comprises (a) forming an intimate mixture of hydroxymethylphosphonic acid and formaldehyde or its condensates, said mixture having a least about 0.5 equivalents of formaldehyde per equivalent of hydroxymethylphosphonic acid; and (b) subjecting said intimate mixture to a temperature of between about 100.degree. C. and 180.degree. C. for a time sufficient to allow the components to react to form a reacted mixture comprising di-(phosphonomethyl) formal. Di-(phosphonomethyl) formal, phosphonate compositions wherein at least about 20 more % of the phosphonate groups are present as di-(phosphonomethyl) formal, and phosphonate compositions which comprise hydroxymethylphosphonic acid and di-(phosphonomethyl) formal such that the mole ratio of phosphonate groups present as di-(phosphonomethyl) formal to phosphonate groups present as hydroxymethylphosphonate is at least about 1:3, as disclosed, may be used for corrosion inhibition in aqueous systems.
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Bansleben Donald A.
Carter Charles G.
Kumar Ranjit
Barr James P.
Fee Valerie D.
Stoll Robert L.
W. R. Grace & Co.,-Conn.
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