US 6,387,987 B2Granted

Acetylide-form propargyl-containing resin composition for cationic electrocoating

AssigneeNippon Paint Co., Ltd.

InventorsHiroyuki Sakamoto, Toshitaka Kawanami, Ichiro Kawakami, Takayuki Kokubun, Takao Saito, Saori Yoshimatsu

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Abstract

An acetylide-form propargyl-containing resin composition for cationic electrocoating, which comprises a resin having a skeleton of epoxy resin and has a number average molecular weight of 500 to 20,000, and which contains, per 100 grams of the resin composition solids, 5 to 400 millimoles of sulfonium group and 10 to 495 millimoles of propargyl group, the total content of the sulfonium and propargyl groups being not more than 500 millimoles per 100 grams of the resin composition solids, said propargyl group being partly in the form of an acetylide. This resin composition may further contain unsaturated double bond.

Claims5

Dependent claims

A process for producing an acetylide-form propargyl-containing resin composition for cationic electrocoating, which comprises the steps of:

(1) reacting an epoxy resin having at least two epoxy groups per molecule with a compound (A) having a functional group capable of reacting with epoxy group and having propargyl group, to obtain a propargyl-containing epoxy resin composition;
(2) reacting the propargyl-containing epoxy resin composition obtained in step (1) with a metal compound to convert part of the propargyl group in said epoxy resin composition into its acetylide form;
and
(3) reacting the remaining epoxy groups in the epoxy resin composition containing part of the propargyl group in the acetylide form as obtained in step (2) with a sulfide/acid mixture to thereby introduce sulfonium group thereinto.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/783,536Filed 15 Feb 2001 · division
Priority: JP 10-20651522 Jul 1998
Published: US 2001/0018498 A130 Aug 2001
Granted: 14 May 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

C08G 59/1444
Containing oxygen: monoalcohols
C08G 59/1483
With organic low-molecular-weight compounds: containing sulfur
C08G 59/1494
Polycondensates modified by chemical after-treatment: followed by a further chemical treatment thereof
C09D 5/4442
Characterised by the nature of the epoxy binder: binder characterised by functional groups