Clear coat/color coat finish containing ultraviolet light stabilizer
AssigneeE. I. DuPont de Nemours and Company
InventorDavid C. Chang
Life of this patent
Estimating the term…
Abstract
The weatherability and durability of clear coat/color coat finishes can be significantly increased by incorporating one or more ultraviolet light stabilizers into the color coat.
Claims71
A substrate having a finish of a clear coat top layer in firm adherence to a color coat layer in adherence with the substrate;
- wherein
- the clear coat contains no ultraviolet light stabilizer and consists essentially of a transparent film-forming binder;
- and
- the color coat consists essentially of a film-forming binder and pigment in a pigment-to-binder weight ratio of about 1/100 to 150/100 and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer;
- wherein the ultraviolet light stabilizer migrates from the color coat to the clear coat and continues to do so as ultraviolet light stabilizer is lost from the clear coat due to exposure to weathering, thereby providing an adequate level of ultraviolet light stabilizer to retard deterioration from weathering of the clear coat.
A substrate having a finish of a clear coat top layer in firm adherence to a color coat layer in adherence with the substrate;
- wherein
- the clear coat consists essentially of a transparent film-forming binder and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer;
- and
- the color coat consists essentially of a film-forming binder and pigment in a pigment-to-binder weight ratio of about 1/100 to 150/100 and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer;
- wherein the ultraviolet light stabilizer migrates from the color coat to the clear coat and continues to do so as ultraviolet light stabilizer is lost from the clear coat due to exposure to weathering, thereby providing an adequate level of ultraviolet light stabilizer to retard deterioration from weathering of the clear coat;
- and
- neither the color coat nor the clear coat contains antioxidant.
A substrate having a finish of a clear coat top layer in firm adherence to a color coat layer in adherence with the substrate;
- wherein
- the clear coat consists essentially of a transparent film-forming binder and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer but contains no antioxidant;
- and
- the color coat consists essentially of a film-forming binder and pigment in a pigment-to-binder weight ratio of about 1/100 to 150/100 and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer and about 0.1-5% by weight of antioxidant;
- wherein
- the ultraviolet light stabilizer migrates from the color coat to the clear coat and continues to do so as ultraviolet light stabilizer is lost from the clear coat due to exposure to weathering, thereby providing an adequate level of ultraviolet light stabilizer to retard deterioration from weathering of the clear coat.
A substrate having a finish of a clear coat top layer in firm adherence to a color coat layer in adherence with the substrate;
- wherein
- the clear coat consists essentially of a transparent film-forming binder and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer and about 0.1-5% by weight of antioxidant;
- and
- the color coat consists essentially of a film-forming binder and pigment in a pigment-to-binder weight ratio of about 1/100 to 150/100 and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer but contains no antioxidant;
- wherein
- the ultraviolet light stabilizer migrates from the color coat to the clear coat and continues to do so as ultraviolet light stabilizer is lost from the clear coat due to exposure to weathering, thereby providing an adequate level of ultraviolet light stabilizer to retard deterioration from weathering of the clear coat.
A process for finishing a substrate which comprises
- (A) applying a color coat layer to the substrate wherein the color coat consists essentially of a liquid carrier and a film-forming binder and pigments in a pigment-to-binder weight ratio of about 1/100 to about 150/100 and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer;
- (B) applying a clear coat layer directly to the color coat layer wherein the clear coat contains no ultraviolet light stabilizer and consists essentially of a liquid carrier and a film-forming binder;
- and
- (C) drying the above applied layers to form a finish on the substrate.
A process for finishing a substrate which comprises:
- (A) applying a color coat layer to the substrate wherein the color coat consists essentially of a liquid carrier and a film-forming binder and pigments in a pigment-to-binder weight ratio of about 1/100 to about 150/100 and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer;
- (B) applying a clear coat layer directly to the color coat layer wherein the clear coat consists essentially of a liquid carrier and a film-forming binder and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer;
- and
- (C) drying the above applied layers to form a finish on the substrate;
- wherein neither the color coat layer nor the clear coat layer contains an antioxidant.
A process for finishing a substrate which comprises:
- (A) applying a color coat layer to the substrate wherein the color coat consists essentially of a liquid carrier and a film-forming binder and pigments in a pigment-to-binder weight ratio of about 1/100 to about 150/100 and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer and about 0.1-5% by weight of antioxidant;
- (B) applying a clear coat layer directly to the color coat layer wherein the clear coat consists essentially of a liquid carrier and a film-forming binder and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer but contains no antioxidant;
- and
- (C) drying the above applied layers to form a finish on the substrate.
A process for finishing a substrate which comprises:
- (A) applying a color coat layer to the substrate wherein the color coat consists essentially of a liquid carrier and a film-forming binder and pigments in a pigment-to-binder weight ratio of about 1/100 to about 150/100 and initially contains 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer but contains no antioxidant;
- (B) applying a clear coat layer directly to the color coat layer wherein the clear coat consists essentially of a liquid carrier and a film-forming binder and initially contains about 1-20% by weight, based on the weight of the binder, of ultraviolet light stabilizer and about 0.1-5% by weight of antioxidant;
- and
- (C) drying the above applied layers to form a finish on the substrate.
Dependencies are inferred from the claim text.