Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1987-08-26
1989-09-19
Kalafut, Stephen J.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
523403, 524901, 525524, C25D 1300, C08K 320
Patent
active
048678546
ABSTRACT:
An improvement is described for a process for the preparation of an epoxy cationic resin from an epoxy resin composition having terminal oxirane groups which includes the step of converting oxirane groups to cationic groups by reacting a nucleophile with at least some of the oxirane groups of the epoxy resin composition wherein an organic acid and water are added during some part of this conversion; wherein the improvement resides in using as the epoxy resin composition a blend of (I) at least one of (A) at least one epoxy-based resin prepared from a diglycidyl ether of a polyether polyol having an average epoxide equivalent weight of from about 350 to about 5,000; or (B) at least one epoxy-based cationic resin prepared from a diglycidyl ether of a polyether polyol having an average epoxide equivalent weight of from about 350 to about 5,000 which diglycidyl ether has been partially capped with a monofunctional capping agent; or (C) a combination of (A) and (B); and (II) at least one different epoxy-based resin; wherein at some time during preparation of the composition, the resins are converted to cationic resins whereby there is obtained a blend of a cationic polyether epoxy-based resin and a different cationic epoxy-based resin; said blend comprising from about 10 to about 90 percent by weight based on total cationic resin and wherein the blend of cationic resins has a charge density of from about 0.2 to about 0.6 milliequivalent of charge per gram of resin.
REFERENCES:
patent: 4315840 (1982-02-01), Kempter et al.
patent: 4515911 (1985-05-01), Swider et al.
patent: 4595716 (1986-06-01), Woo et al.
patent: 4659800 (1987-04-01), Daimer et al.
patent: 4698141 (1987-10-01), Anderson et al.
CA 81:14798a, Jap. Kokai 73 102, 157, vol. 81, 1974, "Water-Based Epoxy Resin Coating Compositions".
Kalafut Stephen J.
The Dow Chemical Company
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