US 6,472,020 B1Granted

Process for multilayer coating film and automotive bodies

AssigneeNippon Paint Co., Ltd.

InventorsManabu Yoshioka, Teruzo Toui

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Abstract

A process for forming a multilayer coating film on automotive bodies which comprises applying a clear coating for top coating, by the wet-on-wet technique, onto a base coating containing a color pigment and/or a luster pigment as applied to a coated automotive panel and then heating the coat layers for curing, said base coating comprising, as resin constituents, a product obtained by grafting a silicate compound (A) onto a hydroxyl-containing acrylic resin or polyester resin and a melamine type curing agent.

Claims4

Dependent claims

A process for forming a multilayer coating film on automotive bodies

which comprises applying a clear coating for top coating, by the wet-on-wet technique, onto a base coating containing a color pigment and/or a luster pigment as applied to a coated automotive panel
and then heating the coat layers for curing,
said base coating comprising, as resin constituents, a product obtained by grafting a silicate compound (A) onto a hydroxyl-containing acrylic resin or polyester resin and an amino and/or blocked polyisocyanate curing agent,
the amount of said silicate compound (A) grafted being 0.1 to 50% by weight (on solids basis) relative to the total amount of said resin constituents,
said clear coating for top coating being an acid/epoxy-curable or amino and/or blocked polyisocyanate-curable clear coating,
said clear coating for top coating containing or being free of an alcohol-modified silicate compound (IV) or a silicate graft polymer (V),
at least one of the resin constituents in said acid/epoxy-curable clear coating and said amino and/or blocked polyisocyanate-curable clear coating being obtained by grafting said silicate compound (A) when said clear coating for top coating contains neither said alcohol-modified silicate compound (IV) nor said silicate graft polymer (V),
said silicate graft polymer (V) being obtained by grafting said silicate compound (A) onto a hydroxyl-containing polymer (V-a),
the amount of said alcohol-modified silicate compound (IV) and/or the amount of said silicate compound (A) grafted being 0.1 to 30% by weight (on solids basis) relative to the total amount of said resin constituents,
said silicate compound (A) being represented by the general formula (1):
wherein m represents an integer of 1 to 50 and the R1's may be different and each represents a substituted or unsubstituted organic group containing 1 to 20 carbon atoms,
and said alcohol-modified silicate compound (IV) being represented by the general formula (2):
wherein n represents an integer of 1 to 50 and one or some of the R2's each represents a substituted or unsubstituted alkyl group containing 2 to 20 carbon atoms or a substituted or unsubstituted aralkyl group containing 7 to 20 carbon atoms and the remaining R2's respectively represent a methyl group.

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Dependencies are inferred from the claim text.

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Abstract

A process for forming a multilayer coating film on automotive bodies

which comprises applying a clear coating for top coating, by the wet-on-wet technique, onto a base coating containing a color pigment and/or a luster pigment as applied to a coated automotive panel
and then heating the coat layers for curing,
said base coating comprising, as resin constituents, a product obtained by grafting a silicate compound (A) onto a hydroxyl-containing acrylic resin or polyester resin and an amino and/or blocked polyisocyanate curing agent,
the amount of said silicate compound (A) grafted being 0.1 to 50% by weight (on solids basis) relative to the total amount of said resin constituents,
said clear coating for top coating being an acid/epoxy-curable or amino and/or blocked polyisocyanate-curable clear coating,
said clear coating for top coating containing or being free of an alcohol-modified silicate compound (IV) or a silicate graft polymer (V),
at least one of the resin constituents in said acid/epoxy-curable clear coating and said amino and/or blocked polyisocyanate-curable clear coating being obtained by grafting said silicate compound (A) when said clear coating for top coating contains neither said alcohol-modified silicate compound (IV) nor said silicate graft polymer (V),
said silicate graft polymer (V) being obtained by grafting said silicate compound (A) onto a hydroxyl-containing polymer (V-a),
the amount of said alcohol-modified silicate compound (IV) and/or the amount of said silicate compound (A) grafted being 0.1 to 30% by weight (on solids basis) relative to the total amount of said resin constituents,
said silicate compound (A) being represented by the general formula (1):
wherein m represents an integer of 1 to 50 and the R1's may be different and each represents a substituted or unsubstituted organic group containing 1 to 20 carbon atoms,
and said alcohol-modified silicate compound (IV) being represented by the general formula (2):
wherein n represents an integer of 1 to 50 and one or some of the R2's each represents a substituted or unsubstituted alkyl group containing 2 to 20 carbon atoms or a substituted or unsubstituted aralkyl group containing 7 to 20 carbon atoms and the remaining R2's respectively represent a methyl group.

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