Process for preparing water-dilutable, heat-curing coating compositions
AssigneeCiba-Geigy Corporation
InventorsKwan Ting Shen, John Allister Gannon, Robert Charles Nelson
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Abstract
A process for preparing water-dilutable, heat-curing coating compositions comprises (a) reacting an aromatic polyglycidyl ether with a polyethylene glycol in the presence of 0 to 20% of a polyhydric phenol, (b) adding an aminoplast curing agent, and (c) diluting with water to give a stable aqueous composition. The process gives compositions which are useful in preparing coatings for a wide variety of substrates obviating the need for organic solvents with their inherent costs and environmental hazards.
Claims18
A process for preparing water-dilutable, heat-curing coating compositions which comprises
- a. reacting an aromatic polyglycidyl ether having a molecular weight in the range of 360 to 500 with a polyethylene glycol having an average molecular weight in the range of 400 to 800 in the presence of 0 to 20% by weight of a polyhydric phenol to form a water-dilutable, hydroxy-containing adduct, wherein the moles of aromatic polyglycidyl ether to combined moles of polyethylene glycol plus polyhydric phenol are in the ratio of 1.0/1.0 to 3.0/1.0 and wherein the moles of polyethylene glycol to moles of polyhydric phenol are in the ratio of 1.0/0.0 to 1.0/1.5,
- b. adding 5 to 50% by weight of solids of an aminoplast curing agent, and
- c. diluting with water to bring the total percent solids in the range of 10 to 80% by weight and to yield a stable, aqueous composition containing no particles larger in size than 0.1 micron.
Dependencies are inferred from the claim text.