Selected phosphoric acid esters as hardeners for epoxy resins
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United States of America Patent
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Aug 1, 1989
Grant Date -
N/A
app pub date -
May 6, 1988
filing date -
May 14, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to hardenable mixtures containing: (i) a polyglycidyl ether or ester based on an aliphatic, cycloaliphatic or aromatic alcohol or a corresponding carboxylic acid and (ii) a hardener obtainable by reaction of: (A) a mixture of 2-4 mol of a monohydric, aliphatic alcohol and 1 mol of phosphorus pentoxide in an inert organic solvent, or of 2 mol of a dialkyl phosphate or of 2 mol of phosphoric acid, if appropriate in combination with 1-2 mol of a monohydric, aliphatic alcohol, with (B) 0.5-1.5 mol of a diglycidyl ether based on a cycloaliphatic or aromatic diol, with the proviso that the said diglycidyl ether used for the preparation of the hardener has an average molecular weight (number-average) of not more than 2,500 and the said hardener is essentially free from 1,2-epoxide groups. The hardenably mixtures are suitable in particular for the production of coatings.
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