Water-soluble ester intermediates and water-insoluble coatings m

Details Water-soluble ester intermediates and water-insoluble coatings m Water-soluble ester intermediates and water-insoluble coatings m

1974-09-20

1976-05-18

Bleutge, John C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 676R, 260 70R, 260 71, 260475P, 260485G, 260834, 260835, 260850, C08L 6126, C08G 1232

Patent

active

039577090

ABSTRACT:
Water-soluble ester intermediates characterized by having 2 and 3 ester groups per molecule are made by condensing (a) a polyol having 2 to 3 hydroxyl groups per mol and a carbon/oxygen ratio between 5:3 and 7:3 with (b) a polycarboxylic acid having a carboxyl functionality of 2 to 3, using an equivalents ratio of polyol to polycarboxylic acid so that the ester intermediate has a hydroxyl functionality of about 3 and using a ratio of 1 mol of polyol per carboxyl group.
The ester intermediates are combined in aqueous media with specific amounts of water-soluble aminoplast resin and the resulting combination is cured at elevated temperatures to produce cross-linked, water-insoluble coatings which are suitable as can and coil coatings.
Small amounts of epoxy resin which is soluble in the ester intermediate may be used to provide coatings having improved adhesion, particularly under certain adverse conditions.

REFERENCES:
patent: 3862072 (1975-01-01), Sekmakas

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