Non-stick coating comprising at least one functional decorative layer and item provided with such a coating

Patent metadata

Field	Value
Publication number	US-9758681-B2
Application number	US-201515323992-A
Country	US
Kind code	B2
Filing date	Jul 6, 2015
Priority date	Jul 8, 2014
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

Provided is a non-stick coating including at least one functional decorative layer, including a pigment composition having a reversible variation of optical and/or colorimetric properties when the coating is subjected to a temperature variation between a cold temperature of 0° C. to 40° C. and a hot temperature of 80° C. to 400° C. The pigment composition includes at least one compound of formula Y (3-x) M x Fe (5-y) Q y O 12 in the form of particles, in which M is selected from the lanthanides, alkaline metals, alkaline-earth metals and metalloids with a degree of oxidation (DO) +3; Q is selected from the group made up of the lanthanides, non-metals with degree of oxidation +4, metals with DO +3 or +4, transition metals with DO +2 or +4, alkaline-earth metals and alkaline metals; and wherein x is between 0 and 0.3 and y is between 0 and 3.

First claim

The invention claimed is:

1. Non-stick coating comprising at least one functional decorative layer, wherein the decorative layer comprises a pigment composition displaying a reversible change in optical and/or colorimetric properties when the coating is subjected, in part or in whole, to a temperature change between a cold temperature and a hot temperature, the cold temperature being between 0° C. and 40° C. and the hot temperature being between 80° C. and 400° C., and wherein the pigment composition comprises at least one compound of formula (I) being in the form of particles:
Y (3-x) M x Fe (5-y) Q y O 12   (I)

in which:
M is selected from the group consisting of lanthanides, alkaline metals, alkaline earth metals and metalloids with a degree of oxidation of +3;
Q is selected from the group consisting of lanthanides, non-metals with a degree of oxidation of +4, metals with a degree of oxidation of +3 or +4, transition metals with a degree of oxidation of +2 or +4, alkaline earth metals and alkaline metals;
x is between 0 and 0.3; and
y is between 0 and 3.

2. Coating according to claim 1 , in which:
M is selected from the group consisting of La, Ce, Ca and Sr, and combinations thereof; and
Q is selected from the group consisting of Si, Al, Ga, Ge, Ti, Cr, Ca, Sr and La, and combinations thereof.

3. Coating according to claim 1 , in which the compound of formula (I) possesses a garnet-type structure.

4. Coating according to claim 1 , in which the compound of formula (I) is selected from among the following compounds:
Y 3 Fe 5 O 12
Y 3 Fe 4.75 Ga 0.25 O 12
Y 2.85 La 0.15 Fe 5 O 12
Y 2.75 Sr 0.25 Fe 4.75 Ge 0.25 O 12
Y 2.9 Sr 0.1 Fe 4.9 Ge 0.1 O 12
Y 2.75 Sr 0.25 Fe 4.75 Si 0.25 O 12
Y 2.9 Sr 0.1 Fe 4.9 Si 0.1 O 12
Y 2.9 Sr 0.1 Fe 4.9 Ti 0.1 O 12
Y 2.85 Sr 0.15 Fe 4.85 Ti 0.15 O 12
Y 2,75 Ca 0.25 Fe 4.75 Ge 0.25 O 12
Y 2.75 Ca 0.25 Fe 4.75 Si 0.25 O 12
Y 3 Fe 4.5 Al 0.5 O 12
Y 3 Fe 4.75 Al 0.25 O 12
Y 3 Fe 4.4 Al 0.5 Cr 0.1 O 12
Y 3 Fe 4.65 Al 0.25 Cr 0.1 O 12
Y 3 Fe 4.75 Ge 0.25 O 12
Y 3 Fe 4.75 Si 0.25 O 12
Y 3 Fe 4.85 Cr 0.15 O 12
Y 3 Fe 3 Al 2 O 12
Y 3 Al 3 Fe 2 O 12

5. Coating according to claim 1 , in which y is between 0 and 0.5.

6. Coating-according to claim 1 , in which the hot temperature is between 120° C. and 240° C.

7. Coating according to claim 1 , in which the decorative layer does not contain a heat-stable binder.

8. Coating according to claim 1 , in which the decorative layer comprises, in addition to the pigment composition, at least one heat-stable binder.

9. Coating according to claim 8 , in which the heat-stable binder is selected from the group consisting of enamels, fluorocarbon resins alone or in a mixture, inorganic polymers or organic-inorganic hybrid polymers synthesized through a sol-gel process, silicones, silicone-polyesters, polyimides, polyphenylene sulfides (PPS), polyethylene sulfides (PES), polyether ether ketones (PEEK), polyether ketones (PEK), polyamide-imides (PAI), fluorosilicones and polybenzimidazoles (PBI), and mixtures thereof.

10. Coating according to claim 1 , in which the pigment composition also comprises at least one other thermochromic compound.

11. Coating according to claim 10 , in which the pigment composition also comprises bismuth oxide.

12. Item comprising a medium having two opposite surfaces, at least one of which is covered in a coating as defined according to claim 1 .

13. Item according to claim 12 , in the form of a cooking tool in which the medium has a concave interior surface intended to be positioned on the side where food might be placed in the item, and a convex exterior surface intended to be positioned toward a heat source.

Assignees

• Seb Sa
• Seb Sa

Inventors

• Le Bris Stephanie
• Perillon Jean-Luc
• Waku Jean
• Serier-Brault Hélène
• Jobic Stéphane

Classifications

• C08K2003/2265

  of iron · CPC title

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01B33/24

  Alkaline-earth metal silicates · CPC title

• A47J36/025

  Vessels with non-stick features, e.g. coatings · CPC title