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Resin composition for aqueous paints
| Details |
Inventors: Fujibayashi, Toshio; Nagaoka, Haruo;
Assignee: Kansai Paint Co., Ltd. (Hyogo, JP)
Primary Examiner: Marquis; Melvyn I.
Assistant Examiner: Aylward; D.
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
A resin composition for an aqueous coating composition contains as a main component a cationic resin (U) having a primary hydroxyl group, obtained by reacting (A) a phenol-novolak epoxy resin, (B) a primary or secondary amine compound having a primary hydroxyl group, and (c) a phenol compound having at least one phenolic hydroxyl group per molecule. The composition has improved water dispersibility, bath stability and pigment dispersibility, and is useful as a cationic electrodeposition coating composition. |
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DETAILED DESCRIPTION We claim: 1.
A cationic electrodeposition coating composition (V) comprising as a main component a mixture of a cationizable resin (U) having a primary hydroxyl group and a hardening agent (H), wherein said cationizable resin (U) is obtained by reacting: (A) a phenol-novolak type epoxy resin represented by the following general formula (I) ##STR17## wherein R.
sub.
2 and R.
sub.
2, which are the same or different, independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an aryl group, an aralkyl group or a halogen atom; R.
sub.
3 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group, an aralkyl group, an allyl group or a halogen atom; R.
sub.
4 and R.
sub.
6, which are the same or different, independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a glycidyloxyphenyl group; R.
sub.
5 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group, an aralkyl group, an allyl group or a halogen atom; and n is an integer of 1 to 38, (B) a secondary amine compound having primary hydroxyl group(s) selected from the group consisting of N-alkylalkanolamines, dialkanolamines, addition products of a monoalkanolamine with an .
alpha.
,.
beta.
-unsaturated carbonyl compound, and amine compounds represented by the formula (VII) below ##STR18## wherein m is an integer of 1 to 6; R.
sub.
21 is hydrocarbon chain having 4 to 36 carbon atoms which may contain a hydroxyl group and/or a polymerizable unsaturated group; and (C) a phenol compound having at least one phenolic hydroxyl group per molecule, said phenol compound being present in an amount within the range of 0.
05 to 1.
5 moles per mole of said epoxy resin (A).
2.
A resin composition (W) for self-hardening coating composition (W) obtained by partially reacting a cationizable resin (U) having a primary hydroxyl group with a hardening agent (H), wherein said cationizable resin (U) is obtained by reacting: (A) a phenol-novolak type epoxy resin represented by the following general formula (I) ##STR19## wherein R
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MEMS 
