Anti-uv coating
AssigneeNexdot
InventorsMichele D’AMICO, Benoit DUBERTRET, Yu-Pu LIN
Life of this patent
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Abstract
A filtering film including compounds absorbing UV-light in a range from 300 nm to 380 nm and a binder, wherein the weighted mean absorbance A380 is greater than 2, and packaging having a substrate that is partially or totally covered with the filtering film or formed from the filtering film. Also, methods of protection of consumer goods against UV-light, in which the consumer goods are enclosed by the filtering film.
Claims18
A filtering film comprising compounds absorbing UV-light in a range from 300 nm to 380 nm and a binder, wherein the weighted mean absorbance A380 of the filtering film is greater than 2, with A380 defined by the following relation:
- A
- 3
-
- 8
-
- 0
- =
- ∫
- 3
-
- 0
-
- 0
- 3
-
- 8
-
- 0
- W
-
- (
- λ
- )
-
- A
-
- (
- λ
- )
-
- d
-
- λ
- ∫
- 3
-
- 0
-
- 0
- 3
-
- 8
-
- 0
- W
-
- (
- λ
- )
-
- d
-
- λ
- where A(λ) represents the absorbance of the filtering film at a given wavelength, and W(λ) represents a weighting function equal to the product of the solar spectrum irradiance ES(λ) and a sensitivity function S(λ) defined as a gaussian function with the peak centered at 300 nm and a standard deviation of 24 nm;
- and
- wherein the compounds absorbing UV-light comprise semi-conductive nanoparticles having a formula
- wherein:
- M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Al, Ga, In, Si, Ge, Sn, Pb and a mixture thereof;
- E is selected from the group consisting of S, Se, Te, N, P, As, Sb, and a mixture thereof;
- x and y are independently a decimal number from 0 to 5;
- and
- x and y are not simultaneously equal to 0;
- wherein the compounds absorbing UV-light further comprise organic anti-UV compounds selected from the group consisting of benzotriazoles, triazines, piperidines, benzophenones, catechol, their derivatives, and mixtures thereof;
- and
- wherein the organic compounds absorbing UV-light in the filtering film are present in an amount that is in a range from 2 wt % to 15 wt %, based on the weight of the filtering film, for a 10 μm-thick film.
4-5. (canceled)
7-8. (canceled)
10-11. (canceled)
13-14. (canceled)
A filtering film comprising compounds absorbing UV-light in a range from 300 nm to 380 nm and a binder, wherein the weighted mean absorbance A380 of the filtering film is greater than 2, with A380 defined by the following relation:
- A
- 3
-
- 8
-
- 0
- =
- ∫
- 3
-
- 0
-
- 0
- 3
-
- 8
-
- 0
- W
-
- (
- λ
- )
-
- A
-
- (
- λ
- )
-
- d
-
- λ
- ∫
- 3
-
- 0
-
- 0
- 3
-
- 8
-
- 0
- W
-
- (
- λ
- )
-
- d
-
- λ
- .
- where A(λ) represents the absorbance of the filtering film at a given wavelength, and W(λ) represents a weighting function equal to the product of the solar spectrum irradiance ES(λ) and a sensitivity function S(λ) defined as a gaussian function with the peak centered at 300 nm and a standard deviation of 24 nm;
- and
- wherein compounds absorbing UV-light comprise semi-conductive nanoparticles having a formula
- wherein:
- M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Al, Ga, In, Si, Ge, Sn, Pb and a mixture thereof;
- E is selected from the group consisting of S, Se, Te, N, P, As, Sb, and a mixture thereof;
- x and y are independently a decimal number from 0 to 5;
- and
- x and y are not simultaneously equal to 0;
- wherein:
- the filtering film is transparent and uncolored.
Dependencies are inferred from the claim text.