초록 ▼

The invention relates in one aspect to a post-formulation concentrated nanocomposite dispersion containing an invisible marker dye. The dispersion typically includes a silicate filler and a matrix polymer dispersed in an aqueous medium as well. The dispersions form optically transparent barrier film

The invention relates in one aspect to a post-formulation concentrated nanocomposite dispersion containing an invisible marker dye. The dispersion typically includes a silicate filler and a matrix polymer dispersed in an aqueous medium as well. The dispersions form optically transparent barrier films wherein the dye is effective to indicate film thickness on a substrate. Specific embodiments of this invention include a nanocomposite coating formulation designed to provide transparent high barrier coatings at thicknesses from 1 to 10 microns that include a near infrared (NIR) or infrared (IR) dye that enables rapid measurement of coating thickness and uniformity. The preferred dye imparts no observable color or appearance change, and thus can also function as an identifier for the coating.

대표청구항 ▼

1. A nanocomposite dispersion containing an invisible marker dye for forming a transparent barrier coating, said dispersion comprising: a) a liquid carrier medium which includes water;b) an exfoliated silicate filler material dispersed in the carrier medium;c) a matrix polymer which is dispersed in

1. A nanocomposite dispersion containing an invisible marker dye for forming a transparent barrier coating, said dispersion comprising: a) a liquid carrier medium which includes water;b) an exfoliated silicate filler material dispersed in the carrier medium;c) a matrix polymer which is dispersed in the carrier medium; andd) an invisible marker water soluble dye;wherein the invisible marker dye exhibits an absorption peak in the infrared region of the electromagnetic spectrum and is present in amounts effective to indicate thickness when the dispersion is made into a dried barrier coating. 2. The nanocomposite dispersion according to claim 1, wherein said dye is present in the dispersion in an amount of at least 5 mg/liter. 3. The nanocomposite dispersion according to claim 1, wherein said dye is present in the dispersion in an amount of at least 5 mg/liter and up to 100 mg/liter. 4. The nanocomposite dispersion according to claim 1, wherein said dye is present in the dispersion in an amount of at least 10 mg/liter and up to 50 mg/liter. 5. The nanocomposite dispersion according to claim 1, wherein a dried barrier coating formed from the dispersion exhibits an at least 25-fold reduction in gas permeability as compared with a coating formed of matrix polymer alone. 6. The nanocomposite dispersion according to claim 1, wherein a dried barrier coating formed from the dispersion exhibits an at least 50-fold reduction in gas permeability as compared with a coating formed of matrix polymer alone. 7. The nanocomposite dispersion according to claim 1, wherein a dried barrier coating formed from the dispersion exhibits an at least 100-fold reduction in gas permeability as compared with a coating formed of matrix polymer alone. 8. The nanocomposite dispersion according to claim 1, wherein a dried barrier coating formed from the dispersion exhibits an at least 500-fold reduction in gas permeability as compared with a coating formed of matrix polymer alone. 9. The nanocomposite dispersion according to claim 1, wherein a dried barrier coating formed from the dispersion exhibits an at least 1000-fold reduction in gas permeability as compared with a coating formed of matrix polymer alone. 10. The nanocomposite dispersion according to claim 1, wherein the exfoliated silicate filler material includes a compound selected from the group consisting of bentonite, vermiculite, montmorillonite, nontronite, beidellite, volkonskoite, hectorite, saponite, laponite, sauconite, magadiite, kenyaite, ledikite, and combinations thereof. 11. The nanocomposite dispersion according to claim 1, wherein the exfoliated silicate filler material includes montmorillonite. 12. The nanocomposite dispersion according to claim 1, wherein the exfoliated silicate filler material includes vermiculite. 13. The nanocomposite dispersion according to claim 1, wherein the exfoliated silicate filler material comprises platelets with an average aspect ratio of at least 50. 14. The nanocomposite dispersion according to claim 1, wherein the exfoliated silicate filler material comprises platelets with an average aspect ratio of at least 1,000. 15. The nanocomposite dispersion according to claim 1, wherein the exfoliated silicate filler material comprises platelets with an average aspect ratio of at least 5,000. 16. The nanocomposite dispersion according to claim 1, wherein the matrix polymer includes a polymer selected from the group consisting of polyesters, polyamides, chlorinated polymers, polyolefins, polyurethanes, polyethers, polyketones, polycarbonates, acrylics, vinylics, fluoropolymers, and combinations thereof. 17. The nanocomposite dispersion according to claim 1, wherein the matrix polymer includes a polyester resin. 18. The nanocomposite dispersion according to claim 1, wherein the matrix polymer includes a sulfonated polyester resin. 19. The nanocomposite dispersion according to claim 1, wherein the invisible marker dye has an absorption peak in the near infrared (NIR) region of the electromagnetic spectrum. 20. The nanocomposite dispersion according to claim 1, wherein the invisible marker dye has an absorption peak in the region of greater than about 700 nm to about 1200 nm. 21. The nanocomposite dispersion according to claim 1, wherein the invisible marker dye has an absorption peak in the region of about 750 nm to about 1000 nm. 22. The nanocomposite dispersion according to claim 1, wherein the invisible marker dye has an absorption peak in the region of about 750 nm to about 850 nm. 23. The nanocomposite dispersion according to claim 1, wherein the invisible marker dye is an NIR dye having an absorption maximum at a wavelength selected from the group consisting of: 910 nm; 864 nm; 844 nm; 824 nm; 820 nm; 819 nm; 807 nm; 783 nm and 782 nm. 24. The nanocomposite dispersion according to claim 1, wherein the invisible marker dye is an NIR dye having an absorption maximum at a wavelength selected from the group consisting of 844 nm and 820 nm. 25. The nanocomposite dispersion according to claim 1, wherein the dispersion further includes at least one adjuvant selected from the group consisting of surfactants, anti-foaming agents, dispersing agents, wetting agents, leveling agents and thickeners. 26. A dried nanocomposite barrier coating having a thickness of from 1 to 10 microns containing an invisible marker dye which is prepared by forming a film from the nanocomposite dispersion according to claim 1. 27. The nanocomposite barrier coating according to claim 26, wherein the coating exhibits an oxygen permeability of less than 0.02 cc-mm/m2-day-atm. 28. The nanocomposite barrier coating according to claim 26, wherein the coating exhibits an oxygen permeability of less than 0.01 cc-mm/m2-day-atm. 29. The new composite barrier coating according to claim 26, adhered to a polymeric substrate. 30. The nanocomposite barrier coating according to claim 26, adhered to a cellulosic substrate. 31. The nanocomposite barrier coating according to claim 26, adhered to a polyolefin substrate. 32. The nanocomposite barrier coating according to claim 26, adhered to a polyester substrate. 33. A nanocomposite dispersion containing an invisible marker dye for forming a transparent barrier coating, said dispersion comprising: a) a liquid carrier medium which includes water;b) an exfoliated silicate filler material dispersed in the carrier medium, wherein said exfoliated filler material comprises platelets with an average aspect ratio of at least 5,000 and up to 30,000;c) a non-elastomeric matrix polymer which is dispersed in the carrier medium; andd) an invisible marker water soluble dye;wherein the invisible marker dye exhibits an absorption peak in the infrared region of the electromagnetic spectrum and is present in amounts effective to indicate thickness when the dispersion is made into a dried barrier coating. 34. The nanocomposite dispersion according to claim 33, wherein said dye is present in the dispersion in an amount of at least 5 mg/liter. 35. The nanocomposite dispersion according to claim 33, wherein said barrier coating exhibits an at least 25-fold reduction in gas permeability as compared with a coating formed of matrix polymer alone. 36. The nanocomposite dispersion according to claim 33, wherein the exfoliated silicate filler material includes a compound selected from the group consisting of bentonite, vermiculite, montmorillonite, nontronite, beidellite, volkonskoite, hectorite, saponite, laponite, sauconite, magadiite, kenyaite, ledikite, and combinations thereof. 37. The nanocomposite dispersion according to claim 33, wherein the matrix polymer includes a polymer selected from the group consisting of polyesters, polyamides, chlorinated polymers, polyolefins, polyurethanes, polyethers, polyketones, polycarbonates, acrylics, vinylics, fluoropolymers, and combinations thereof. 38. The nanocomposite dispersion according to claim 33, wherein the invisible marker dye has an absorption peak in the region of greater than about 700 nm to about 1200 nm. 39. The nanocomposite dispersion according to claim 33, wherein the invisible marker dye is an NIR dye having an absorption maximum at a wavelength selected from the group consisting of: 910 nm; 864 nm; 844 nm; 824 nm; 820 nm; 819 nm; 807 nm; 783 nm and 782 nm. 40. A dried nanocomposite barrier coating having a thickness of from 1 to 10 microns containing an invisible marker dye which is prepared by forming a film from the nanocomposite dispersion according to claim 33. 41. The nanocomposite barrier coating according to claim 40, adhered to a polymeric substrate.