Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1993-06-14
1994-11-01
Sellers, Robert E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
525525, 525526, 525527, 528 89, 528102, 528103, 523403, C08G 5914, C08K 320, C08L 6302
Patent
active
053608380
ABSTRACT:
An advanced epoxy cationic resin useful as an electrodeposition coating and having a charge density of from 0.2 to 0.6 milliequivalent of cationic charge per gram of resin is prepared by reacting in the presence of a suitable catalyst (A) a composition comprising (1) at least one diglycidyl ether of (a) an oxyalkylated aromatic diol or (b) an oxyalkylated cycloaliphatic diol or (c) certain oxyalkylated aliphatic diols and (2) at least one diglycidyl ether of a dihydric phenol with (B) at least one dihydric phenol and optionally (C) a monofunctional capping agent.
Components (A-1) and (A-2) are employed in quantities such that from 10 to 75 weight percent of the diglycidyl ethers contained in component (A) are contributed by component (A-1), and from 25 to 90 weight percent of such glycidyl ethers are contributed by component (A-2). Components (A) and (B) are employed in such quantities that the resultant epoxy resin has an average epoxide equivalent weight of from 350 to 10,000. The terminal oxirane groups in the thus formed advanced epoxy resin are converted to cationic groups by reacting the resin with a nucleophilic compound and adding an organic acid and water.
REFERENCES:
patent: 4698141 (1987-10-01), Anderson et al.
patent: 4737553 (1988-04-01), Gannon et al.
patent: 4820784 (1989-04-01), Massingill, Jr. et al.
patent: 4845172 (1989-07-01), Brytus et al.
patent: 4857567 (1989-08-01), Laugal et al.
Chem. Abs. 112:8764d (1990).
Anderson Kenneth W.
Hickner Richard A.
Sellers Robert E.
The Dow Chemical Company
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