COATING COMPOSITIONS

• US 20100239642A1
• Filed: 07/03/2008
• Published: 09/23/2010
• Est. Priority Date: 07/18/2007
• Status: Abandoned Application

• Current Assignee: DataLase Ltd.
• Original Assignee: CIBA Vision Corporation (Bayer AG)
• Inventors: Campbell, Jonathan, Kaeser, Adolf, Mistry, Kishor Kumar, Hoekstra, Kathleen
• Application Number:
  US12/668,666
• Publication Number:
  US 20100239642A1
• Time in Patent Office: Days
• US Class Current: 424/443
• CPC Class Codes: B41M 5/26 Thermography B41M5/20, B41M5/24 take precedence; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used B23K takes precedence; thermographic or photothermographic systems using noble metal compounds G03C1/494
• CPC Class Codes: B41M 5/267 Marking of plastic artifacts, e.g. with laser
• CPC Class Codes: B41M 5/30 using chemical colour formers B41M5/34 takes precedence
• CPC Class Codes: B41M 5/337 Additives; Binders B41M5/46 takes precedence
• CPC Class Codes: B41M 5/3372 Macromolecular compounds
• CPC Class Codes: B41M 5/3375 Non-macromolecular compounds
• CPC Class Codes: B41M 5/3377 Inorganic compounds, e.g. metal salts of organic acids
• CPC Class Codes: C08K 3/30 Sulfur-, selenium- or tellurium-containing compounds
• CPC Class Codes: C08K 3/32 Phosphorus-containing compounds
• CPC Class Codes: C08K 5/15 Heterocyclic compounds having oxygen in the ring
• CPC Class Codes: C08K 5/17 Amines; Quaternary ammonium compounds
• CPC Class Codes: C08K 9/10 Encapsulated ingredients
• CPC Class Codes: C09D 11/03 characterised by features other than the chemical nature of the binder
• CPC Class Codes: C09D 5/185 Intumescent paints
• CPC Class Codes: C09D 7/63 organic
• CPC Class Codes: Y10T 428/249921 Web or sheet containing structurally defined element or component
• CPC Class Codes: Y10T 428/31645 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31895 Paper or wood
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer

Abstract

Described are coating compositions for marking substrates comprising a) a solvent, b) a salt of a phosphorus or boron containing acid and an amine or imine, c) a salt of a non-phosphorus and non-boron containing acid and an amine or imine, d) a binder, and e) optionally additional ingredients, their manufacture and use, wherein the above-mentioned salts can also be present in an encapsulated form as a kind of pseudo-pigment. Substrates coated by the above compositions can be marked by laser irradiation.

Claims

1. A coating composition for marking substrates comprising

a) a solvent,

b) a salt of a phosphorus or boron containing acid and an amine or imine,

c) a salt of a non-phosphorus and non-boron containing acid and an amine or imine, and

d) a binder,

but not comprising asbestos and glass fibre.

2. The composition according to claim 1 wherein the binder is a polymeric binder.

3. The composition according to claim 1 wherein the binder is different from a halogenated hydrocarbon.

4. The composition according to claim 1 comprising

a) a solvent different from a polyhydric alcohol having at least 5 carbon atoms,

b) a salt of a phosphorus or boron containing acid and an amine or imine,

c) a salt of a non-phosphorus and non-boron containing acid and an amine or imine, and

d) a binder different from a halogenated hydrocarbon,

but not comprising asbestos, and glass fibre.

5. The composition according to claim 1 additionally comprising a char forming compound.

6. The composition according to claim 1 comprising

a) a solvent,

b) a salt of a phosphorus or boron containing acid and an amine or imine,

c) a salt of a non-phosphorus and non-boron containing acid and an amine or imine,

d) a binder, and

e) a char forming compound.

7. The composition according to claim 1 wherein the solvent is selected from water, C_1-4-alkanols, C_3-6-ketones, C_4-6-ethers, C_2-3-nitriles, nitromethane, dimethylsulfoxide, dimethylformamide, dimethylacetamide, N-methyl pyrolidone and sulfolane, wherein C_1-4-alkanols may be substituted with C_1-4-alkoxy, or mixtures thereof.

8. The composition according to claim 1 comprising

a) a solvent selected from water, C_1-4-alkanols, C_3-6-ketones, C_4-6-ethers, C_2-3-nitriles, nitromethane, dimethylsulfoxide, dimethylformamide, dimethylacetamide, N-methyl pyrolidone and sulfolane, wherein C_1-4-alkanols may be substituted with C_1-4-alkoxy, or mixtures thereof,

b) a salt of a phosphorus or boron containing acid and an amine or imine,

c) a salt of a non-phosphorus and non-boron containing acid and an amine or imine, and

d) a binder selected from vinylacetate, (meth)acrylic and styrene type homo and copolymers;

carboxymethylcellulose;

starch-type binders; and

dimethylamino ethyl methacrylate/methyl methacrylate polymer,

but not comprising asbestos and glass fibre.

9. The composition according claim 1 wherein the solvent is water.

10. The composition according to claim 1 wherein the salt of a phosphorus or boron containing acid and an amine or imine is ammonium phosphate.

11. The composition according to claim 1 wherein the salt of a non-phosphorus and non-boron containing acid and an amine or imine is ammonium sulfate.

12. The composition according to claim 1 wherein the binder is selected from vinylacetate, (meth)acrylic and styrene type homo and copolymers;

carboxymethylcellulose;

starch-type binders; and

dimethylamino ethyl methacrylate/methyl methacrylate polymer.

13. The composition according to claim 1 additionally comprising a char forming compound selected from sucrose, sucralose, 2-ethanolamine and 2-(2′

-aminoethoxy)ethanol.

14. The composition according to claim 1 in the form of a laser-markable transparent or white ink.

15. The composition according to claim 5 wherein

a) the salt of a phosphorus or boron containing acid and an amine or imine,

b) the salt of a non-phosphorus and non-boron containing acid and an amine or imine, and

c) the char forming compound

are present in a hidden, disguised or encapsulated form.

16. The composition according to claim 15 wherein

a) the salt of a phosphorus or boron containing acid and an amine or imine,

b) the salt of a non-phosphorus and non-boron containing acid and an amine or imine, and

c) the char forming compound

are hidden, disguised or encapsulated in a polymer.

17. Pseudo pigments composition for use in a composition according to claim 15 comprising

a) a salt of a phosphorus or boron containing acid and an amine or imine,

b) a salt of a non-phosphorus and non-boron containing acid and an amine or imine,

c) a char forming compound, and

d) a polymeric encapsulating material.

18. The composition according to claim 16 wherein the encapsulating polymer is selected from melamine formaldehyde polymer, urea formaldehyde polymers, polyacrylic acid, styrene acrylic polymer, cross-linked polyacrylamide, crosslinked acrylamide-sodium acrylate copolymers, crosslinked polyhydroxyethylacrylates, gelatin, cellulose derivatives, polyvinyl alcohols, styrene-anhydride copolymers, polyvinylpyrrolidones, and starches.

20. A process of making the pseudo pigments according to claim 17 comprising emulsifying an aqueous composition comprising

a) a salt of a phosphorus or boron containing acid and an amine or imine,

b) a salt of a non-phosphorus and non-boron containing acid and an amine or imine,

c) a char forming compound, and

d) a suitable monomer mixture, or a suitable reactive resin;

or a suitable aqueous polymer preparation

into water immiscible liquid in the presence of an amphiphatic stabilizer to form an emulsion having a mean aqueous droplet size diameter below 30 microns;

in case of starting from the above-mentioned monomer mixture inducing polymerisation reaction to form the encapsulation;

in case of starting from the above-mentioned reactive resin inducing polycondensation to form the encapsulation;

removing the water to less than 5% of the pseudo pigment dry content, and isolating the pseudo pigments.

21. A substrate coated by a composition according to claim 1.

22. A process for preparing a marked substrate, comprising the steps of

i) coating a substrate with the composition of claim 1, and

ii) exposing those parts of the coated substrate, where a marking is intended, to energy by means of a laser beam.

23. The substrate of claim 21 wherein the substrate is a thin polypropylene film including a biaxially oriented polypropylene (BOPP) film.

24. The substrate of claim 21 wherein the substrate is selected from pharmaceutical dosage forms, food, paper, packaging board, adhesive labels, glass, textiles, polymers, and metals.

25. The process according to claim 22 wherein the substrate is a thin polypropylene film including a biaxially oriented polypropylene (BOPP) film.

26. The process according to claim 22 wherein the substrate is selected from pharmaceutical dosage forms, food, paper, packaging board, adhesive labels, glass, textiles, polymers, and metals.

19. (canceled)