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1. WO2019123477 - PROTECTION TEMPORAIRE POUR ARTICLES EN VERRE REVÊTU POUVANT ÊTRE TRAITÉS THERMIQUEMENT COMPRENANT UN MONOMÈRE ACRYLIQUE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

We claim,

1) A heat treatable coated article comprising:

a transparent substrate having a first surface;

a functional coating deposited over at least a portion of the first surface;

a temporary protective coating deposited over at least a portion of the functional coating;

wherein the temporary protective coating comprising acrylic monomers protects the functional coating during heat treatment and handling of the heat treatable coated article before heat treatment.

2) The heat treatable coated article as claimed in claim 1, wherein the temporary protective coating comprises solid particle reinforced acrylic monomers.

3) The heat treatable coated article as claimed in claim 1, wherein the functional coating consists of single layer or multilayer coating comprising one or more metals, non-metals, alloys, composites, compounds or their derivatives or combinations thereof.

4) The heat treatable coated article as claimed in claim 1, wherein the functional coating may be selected from the group consisting of magnetron deposited coatings, sputter deposited coating or chemical vapor deposited coatings.

5) The heat treatable coated article as claimed in claim 1, wherein the functional coating comprises of low emissivity coatings, solar energy reflective or absorptive coatings, thermal infrared reflective or absorptive coatings or their combinations thereof.

6) The heat treatable coated article as claimed in claim 1 or claim 2, wherein the temporary protective coating comprises of acrylic monomers selected from the group consisting of trimethylol propane tri acrylate (TMPTA), hexanediol diacrylate (HDDA), tricyclodecane dimethanol diacrylate (TCDDA), pentaeryhtritol Tetraacrylate, ethoxylated(3) trimethylolpropane triacrylate, pentaacrylate, 2-phenoxyethyl acrylate, isobornyl acrylate, dipentaerythritol hexaacrylate, tetrahydrofurfuryl acrylate, tripropelene glycol diacrylate (TPGDA), stearyl acrylate, octadecyl acrylate, penta erythrol tri and tetra acrylate (PETA), tripropyleneglycol monomethyl ether acrylate (TPGMEMA) or their combinations thereof.

7) The heat treatable coated article as claimed in claim 1, wherein the temporary protective coating comprises of acrylic monomers ranging between 80 % and 96 %.

8) The heat treatable coated article as claimed in claim 2, wherein the temporary protective coating comprises of acrylic monomers ranging between 30 % and 90 %.

9) The heat treatable coated article as claimed in claim 1 or claim 2, wherein the temporary protective coating has a thickness ranging between 5 microns and 100 microns.

10) The heat treatable coated article as claimed in claim 1 or claim 2, wherein the temporary protective coating is substantially a continuous or a non- continuous coating that is devoid of any oligomeric acrylates.

11) The heat treatable coated article as claimed in claim 1 or claim 2, wherein the temporary protective coating includes additives selected from the group consisting of adhesion promoters, photo initiators or surfactants. 12) The heat treatable coated article as claimed in claim 2, wherein the solid particle is selected from the group consisting of polymeric micro beads, solid acrylic copolymers, glass bubble, glass flakes, glass fibers, ceramic particles, acrylated silica, nano composite inorganic oxides or their combinations thereof.

13) The heat treatable coated article as claimed in claim 2, wherein the size of the solid particle ranges between 5 and 100 microns.

14) The heat treatable coated article as claimed in claim 1, wherein the transparent substrate may be a flat glass or a curved glass.

15) The heat treatable coated article as claimed in claim 1, wherein the transparent substrate is selected from the group consisting of non- tempered glass, annealed glass or strengthened glass.

16) The heat treatable coated article as claimed in claim 1, wherein handling of the heat treatable coated article includes cutting, edge grinding, beveling, drilling, sizing, finishing, storing and transporting of the heat treatable coated article.

17) The heat treatable coated article as claimed in claim 1 or claim 2, wherein the temporary protective coating is completely removed during the heat treatment.

18) The heat treatable coated article as claimed in claim 1, wherein the heat treatment involves heating to a temperature ranging above 550 °C and below 800 °C.

19) A coating composition for forming a temporary protective coating over a heat treatable coated article having a functional coating, wherein the coating comprises:

acrylic monomers selected from the group consisting of trimethylol propane tri acrylate (TMPTA), hexanediol diacrylate (HDD A), tricyclodecane dimethanol diacrylate (TCDDA), pentaeryhtritol tetraacrylate, ethoxylated(3) trimethylolpropane triacrylate, pentaacrylate, 2-phenoxyethyl acrylate, isobomyl acrylate, dipentaerythritol hexaacrylate, tetrahydrofurfuryl acrylate, tripropelene glycol diacrylate (TPGDA), stearyl acrylate, octadecyl acrylate, penta erythrol tri and tetra acrylate (PET A), tripropyleneglycol monomethyl ether acrylate (TPGMEMA) or their combinations thereof, wherein the temporary protective coating is devoid of any oligomeric acrylates.

20) A coating composition for forming a temporary protective coating over a heat treatable substrate having a functional coating, wherein the coating comprises:

solid particle reinforced acrylic monomers wherein the acrylic monomers selected from the group consisting of trimethylol propane tri acrylate (TMPTA), hexanediol diacrylate (HDD A), tricyclodecane dimethanol diacrylate (TCDDA), pentaeryhtritol tetraacrylate, ethoxy lated(3) trimethylolpropane triacrylate, pentaacrylate, 2- phenoxyethyl acrylate, isobomyl acrylate, dipentaerythritol hexaacrylate, tetrahydrofurfuryl acrylate, tripropelene glycol diacrylate (TPGDA), stearyl acrylate, octadecyl acrylate, penta erythrol tri and tetra acrylate (PETA), tripropyleneglycol monomethyl ether acrylate (TPGMEMA) or their combination thereof, and the solid particle is selected from the group consisting of polymeric micro beads, solid acrylic copolymers, glass bubble, glass flakes, ceramic particles, acrylated silica, nano composite inorganic oxides or their combinations thereof and wherein the temporary protective coating is devoid of any oligomeric acrylates

21) The coating composition as claimed in claim 19 or claim 20 comprises of additives selected from the group consisting of adhesion promoters, photo initiators or surfactants.

22) A method of protecting a coated article during heat treatment and handling of the coated article before heat treatment, comprising the steps of:

providing a transparent substrate having a first surface provided with a functional coating over at least a portion of the first surface; providing a temporary protecting coating over at least a portion of the functional coating, wherein the temporary protecting coating comprises acrylic monomers or solid particle reinforced acrylic monomers;

curing the coated substrate;

handling the coated substrate; and

heating the coated substrate for removing the temporary protective coating, wherein the temperature ranges above 550 °C and below 800 °C.

23) The method as claimed in claim 22, wherein the solid particles present in the temporary protective coating act as spacers and rolling objects that protects the functional coating of the heat treatable coated article from mechanical and chemical damages during heat treatment and handling.

24) A method of making a heat treatable coated article that can be handled before heat treatment, comprising the steps of:

providing a transparent substrate;

depositing a functional coating on one surface of the substrate; curing or drying the substrate coated with the functional coating; providing a temporary protective coating over the functional coating; and

UV curing the substrate coated with the temporary protective coating.

25) The method as claimed in claim 24 further involves handling the substrate coated with the temporary protective coating and heat treating the handled substrate to a temperature ranging above 600 °C and below 800 °C to completely remove the temporary protective coating.