Multilayer coating film formation method
AssigneeKansai Paint Co., Ltd.
InventorTakuya Nakabayashi
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Abstract
The multilayer coating film formation method for forming a multilayer coating film on a substrate comprises the steps of: applying an undercoat paint composition (X) comprising an antioxidant (a1) to a substrate to form at least one layer of an uncured first coating film; applying a topcoat paint composition (Y) containing a carboxy-containing polymer (b1) and an epoxy-containing acrylic resin (b2) to the first coating film to form an uncured second coating film; and simultaneously heating the uncured first coating film and the uncured second coating film to cure the films.
Claims23
A multilayer coating film formation method for forming a multilayer coating film on a substrate, the method comprising the steps of:
- applying an undercoat paint composition (X) comprising an antioxidant (a1) to a substrate to form at least one layer of an uncured first coating film;
- applying a topcoat paint composition (Y) comprising a carboxy-containing polymer (b1) and an epoxy-containing acrylic resin (b2) to the first coating film to form an uncured second coating film,
- wherein the carboxy-containing polymer (b1) is
- (i) a vinyl polymer having a half-esterified acid anhydride group (b1-1),
- (ii) a carboxy-containing polyester polymer (b1-2), or
- (iii) a combination of the vinyl polymer having a half-esterified acid anhydride group (b1-1) and the carboxy-containing polyester polymer (b1-2);
- and
- simultaneously heating the uncured first coating film and the uncured second coating film to cure the films such that the epoxy-containing acrylic resin (b2) functions as a crosslinking-curing agent only for the carboxy-containing polymer (b1).
A multilayer coating film formation method for forming a multilayer coating film on a substrate, the method comprising the steps of:
- applying an undercoat paint composition (X) comprising an antioxidant (a1) to a substrate to form at least one layer of an uncured first coating film;
- applying a topcoat paint composition (Y) comprising a carboxy-containing polymer (b1) and an epoxy-containing acrylic resin (b2) to the first coating film to form an uncured second coating film, the carboxy-containing polymer (b1) including at least one selected from the group consisting of a vinyl polymer having a half-esterified acid anhydride group (b1-1) and a carboxy-containing polyester polymer (b1-2);
- and
- simultaneously heating the uncured first coating film and the uncured second coating film to cure the films such that the epoxy-containing acrylic resin (b2) functions as a crosslinking-curing agent for the carboxy-containing polymer (b1),
- wherein the topcoat paint composition (Y) consists of a carboxy-containing polymer (b1) and an epoxy-containing acrylic resin (b2) to the first coating film to form an uncured second coating film, the carboxy-containing polymer (b1) consisting of at least one selected from the group consisting of a vinyl polymer having a half-esterified acid anhydride group (b1-1) and a carboxy-containing polyester polymer (b1-2).
A multilayer coating film formation method for forming a multilayer coating film on a substrate, the method comprising the steps of:
- applying an undercoat paint composition (X) comprising an antioxidant (a1) to a substrate to form at least one layer of an uncured first coating film;
- applying a topcoat paint composition (Y) comprising a carboxy-containing polymer (b1) and an epoxy-containing acrylic resin (b2) to the first coating film to form an uncured second coating film, the carboxy-containing polymer (b1) including at least one selected from the group consisting of a vinyl polymer having a half-esterified acid anhydride group (b1-1) and a carboxy-containing polyester polymer (b1-2);
- and
- simultaneously heating the uncured first coating film and the uncured second coating film to cure the films such that the epoxy-containing acrylic resin (b2) functions as a crosslinking-curing agent for the carboxy-containing polymer (b1),
- wherein the topcoat paint composition (Y) consists of a carboxy-containing polymer (b1), an epoxy-containing acrylic resin (b2), an antioxidant, a curing catalyst, an ultraviolet absorber, a light stabilizer, and a surface adjusting agent.
A multilayer coating film formation method for forming a multilayer coating film on a substrate, the method comprising the steps of:
- applying an undercoat paint composition (X) comprising an antioxidant (a1) to a substrate to form at least one layer of an uncured first coating film;
- applying a topcoat paint composition (Y) comprising a carboxy-containing polymer (b1) and an epoxy-containing acrylic resin (b2) to the first coating film to form an uncured second coating film, the carboxy-containing polymer (b1) including at least one selected from the group consisting of a vinyl polymer having a half-esterified acid anhydride group (b1-1) and a carboxy-containing polyester polymer (b1-2);
- and
- simultaneously heating the uncured first coating film and the uncured second coating film to cure the films such that the epoxy-containing acrylic resin (b2) functions as a crosslinking-curing agent for the carboxy-containing polymer (b1),
- wherein the topcoat paint composition (Y) consists of a carboxy-containing polymer (b1), an epoxy-containing acrylic resin (b2), an antioxidant, a curing catalyst, an ultraviolet absorber, a light stabilizer, and a surface adjusting agent, and
- wherein the antioxidant includes an antioxidant having phenyl group and sulfide bond.
Dependencies are inferred from the claim text.