Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-11-13
1983-08-09
Pertilla, Theodore E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
428 35, 523403, 523416, 525524, 528108, C08L 6300, C08K 505
Patent
active
043979700
ABSTRACT:
The invention is an improved process for preparing epoxy resin/phosphoric acid reaction products having high enough phosphomonoester contents to be water-dispersible (as base salts) and low enough free acid contents to yield water-resistant cured coatings. The phosphoric acid is provided as an acid source material deriveable by the reaction of a hydroxylic P--OH functionality-limiting agent (blocking agent) with phosphoric anhydride as such or as a reaction product thereof with less than six molecular proportions of water. A resin solvent, which may also function as the P--OH blocking agent but otherwise is inert and acceptable as part of the final coating resin formulation, is employed as the reaction medium. The epoxide/acid reaction is allowed to proceed, effectively in the absence of water, until the content in the reaction mixture of species indistinguishable from H.sub.3 PO.sub.4 by base-titration has dropped to a minimum. Then enough water to hydrolyze the phosphopolyesters present is added and the hydrolysis is carried out, thereby cleaving the ester groups formed from the blocking agent and generating the P--OH groups needed for salification. The disclosed resin compositions are of particular utility for coating the interiors of beverage cans.
REFERENCES:
patent: 2541027 (1951-02-01), Bradley
patent: 3245940 (1966-04-01), Ronay et al.
patent: 4059550 (1977-11-01), Shimp
patent: 4164487 (1979-08-01), Martin
patent: 4289812 (1981-09-01), Martin
Campbell Kent D.
Langer Horst G.
Martin Patrick H.
Pertilla Theodore E.
The Dow Chemical Company
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