US 6,333,380 B1Granted

Thermosetting resin composition for powder paint and thermosetting powder paint composition using the same

AssigneeMitsui Chemicals, Inc.

InventorsHiroyuki Sakayama, Yoshio Kikuta, Mitsuyuki Mizoguchi, Takahisa Miyawaki, Tsuyoshi Matsumoto

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Abstract

There are disclosed a thermosetting resin composition for a powder paint in which a resin composition component (A) is a (block) copolymer obtained by allowing a vinyl-based polymer G (branch) block (component (a-1)) to graft-react with a vinyl-based polymer S (back bone) block (component (a-2)), and if the solubility parameters of the components (a-1) and (a-2) are represented by SPG and SPG, respectively, SPG and SPS satisfy the following numerical formula (I), and a thermosetting powder paint composition comprising a resin composition component (A) and a hardener composition component (B) wherein the component (A) is said thermosetting resin composition for a powder paint. By these compositions, a thermosetting powder paint composition having excellent storage stabilities, appearance properties, physical properties and chemical properties can be provided. Particularly, there can be provided a thermosetting powder paint composition suitably applied to painting of bodies of vehicles such as automobiles and parts of vehicles such as automobiles (aluminum wheel, wiper, pillar, door handle, fender, bonnet, air spoiler, stabilizer, front grill and the like), particularly, to top painting. SPG<SPS (I)

Claims13

Dependent claims

A thermosetting resin composition for a powder paint in which a resin composition component (A) is a (block) copolymer obtained by allowing a vinyl-based polymer G (branch) block (component (a-1)) to graft-react with a vinyl-based polymer S (back bone) block (component (a-2)), and when the solubility parameters of the components (a-1) and (a-2) are represented by SPG and SPS, respectively, SPG and SPS satisfy the following numerical formulae (I) and (III):

SPG<SPSS (I)
SPG≦10 (III)
and when the weights of said components (a-1) and (a-2) are represented by MG and MS, respectively, MG and MS satisfy the following numerical formula (II):
MS×10−4≦MG≦MS×10−1 (II)
and said component (a-2) comprises
(a-2-1) at least one monomer containing in one molecule at least one radical-polymerizable unsaturated double bond and having no reactive functional group other than the radical-polymerizable unsaturated double bond and
(a-2-2) at least one monomer containing in one molecule at least one radical-polymerizable unsaturated double bond and at least one non-radical-polymerizable functional group together, and the amount of component (a-2-2) is from 20 to 60 parts by weight based on 100 parts by weight of the total amount of the component (a-2-1) and the component (a-2-2).

4 more elements

Dependencies are inferred from the claim text.