Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-04-05
2005-04-05
Nutter, Nathan M. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S194000, C525S206000, C525S207000, C525S208000, C525S222000, C525S241000
Reexamination Certificate
active
06875815
ABSTRACT:
Disclosed is a thermosetting powder coating composition comprising (A) a glycidyl group-containing acrylic resin obtained by (co)polymerizing monomers containing an ethylenically unsaturated monomer having a glycidyl group and/or a β-methylglycidyl group, (B) a polycarboxyl curative, and (C) an alcohol adduct of a styrene/maleic anhydride copolymer. Also disclosed are a cross-linked cured film of the composition and a process for preparing the composition. According to the invention, blending efficiency and dispersibility of the components of a powder coating, particularly those between the resin component and the curative component, are improved without changing a conventional production process of a powder coating, i.e., a process consisting of melt blending, cooling solidification, pulverization and sieving, and thereby a thermosetting powder coating composition, which is capable of forming a cross-linked cured film improved in appearance properties (high gloss, etc.), physical properties (hardness, scratch/mar resistance, etc.), and chemical properties (acid resistance, solvent resistance, etc.), particularly in scratch/mar resistance and/or chemical properties, and having a 60° gloss value of not less than 80, and which is favorably used for coating of automotive bodies and automotive parts, can be provided.
REFERENCES:
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Salitros, J.J. et al., “Gloss modification of thermoset powder coatings with styrene-maleic anhydride copolymers,” Proceedings of the Waterborne, High-Solids, and Powder Coatings Symposium, pp 517-526, 1992, Chemical Abstracts Database Accession No. 117:132938 XP002254856.
Hirose Yoshiharu
Mizoguchi Mitsuyuki
Burns Doane , Swecker, Mathis LLP
Mitsui Chemicals Inc.
Nutter Nathan M.
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