Light-stabilizing transfer medium

Abstract

The present invention relates to a preparation comprising a light stabilizer, its use for the production of a transfer medium, a process making the same, as well as a transfer medium and its use.

Claims

1. An aqueous preparation comprising (i) at least one hydrophilic organic polymer, (ii) optionally at least one filler, (iii) optionally at least one water-soluble alkaline salt, (iv) at least one light stabilizer, and (v) water, wherein said aqueous preparation has a solid content of 15-50%, and wherein the light stabilizer is free of carboxylic and sulfonic groups.

2. The aqueous preparation according to claim 1, wherein the hydrophilic organic polymer is selected from the group consisting of polyacrylic acid, polyacrylester, polyacrylamide, polyvinyl alcohol, a copolymer comprising at least one of an acrylic acid, acrylic acid ester, acrylamide and vinyl acetate or salts thereof.

3. The aqueous preparation according to claim 1, wherein the filler is an inorganic oxide.

4. The aqueous preparation according to claim 1, wherein the alkaline salt is selected from the group consisting of hydrogen (carbonate), M2OnSiO2 with M=alkali metal, aluminate and phosphate salt.

5. The aqueous preparation according to claim 1, wherein the light stabilizer is selected from a UV absorber, a light quencher, a radical scavenger, a secondary anti-oxidant and a peroxide decomposer.

6. The aqueous preparation according to claim 1, wherein the light stabilizer sublimates at a temperature in the range of 140-220 C.

7. The aqueous preparation according to claim 1, wherein the light stabilizer is non-ionic and is at least partially water-insoluble.

8. The aqueous preparation according to claim 5, wherein the UV absorber dissipates the absorbed irradiation as thermal energy.

9. The aqueous preparation according to claim 5, wherein the UV absorber is based on benzophenone, benzotriazole, oxalanilide, phenyltriazine, and derivatives thereof.

10. The aqueous preparation according to claim 1, wherein the UV absorber is selected from the group consisting of (2-hydroxyphenyl)benzotriazole (BTZ), hydroxyphenyl-s-triazine (HPT), 2-hydroxybenzophenone (BP), oxalanilide, Benzotriazole-1 (2-(2-hydroxy-3-tert-butyl-5-propionicacidisooctylester)-2H-benzotriazole), Benzotriazole-2 (2-(2-hydroxy-3,5-di-tert-amylphenyl)-2H-benzotriazole), Benzotriazole-3 (reaction product of 2-(2-hydroxy-3-tert-butyl-5-propionic acid methyl ester)-2H-benzotriazole and polyethylene glycol 300), Benzotriazole-4 (2-[2-hydroxy-3,5-di(1,1-dimethylbenzyl)phenyl]-2H-benzo-triazole), HPT-1 (2-{4-[(2-hydroxy-3-dodecyloxy/tridecyloxypropyl)oxy-2-hydroxyphenyl]}-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine), HPT-2 (2-[4-(2-hydroxy-3-(2-ethylhexyl)oxy-2-hydroxyphenyl)]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine), HPT-3 (2-(4-octyloxy-2-hydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine), Benzophenone-1 (2-hydroxy-4-octyloxybenzophenone), Benzophenone-2 (2-hydroxy-4-dodecyloxybenzophenone), and Oxalanilide-1 (N-(2-ethoxyphenyl)-N-(4-isododecylphenyl)ethanediamide).

11. The aqueous preparation according to claim 5, wherein the radical scavenger is selected from phenol and its derivatives and hindered amine light stabilizers (HALS).

12. The aqueous preparation according to claim 11, wherein the hindered amine light stabilizer is selected from the group consisting of HALS-1 (bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate), HALS-2 (bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate), HALS-3 (bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)sebacate), HALS-4 (bis(1,2,2,6,6-pentamethyl-4-piperidinyl)[3,5-bis(1,1-dimethylethyl-4-hydroxyphenyl)methyl]butylpropandioate), HALS-5 (N-(1,2,2,6,6-pentamethyl-4-piperidinyl)-2-dodecsyulccinimide), HALS-6 (N-(1-acetyl-2,2,6,6-tetramethyl-4-piperidinyl)-2-dodecylsuccinimide), and HALS-7 (N-(2-hydroxyethyl-2,2,6,6-tetramethylpiperidine-4-ol succinic acid copolymer).

13. The aqueous preparation according to claim 1, wherein the quencher is selected from organic nickel compounds.

14. The aqueous preparation according to claim 1, wherein the secondary anti-oxidant is based on phosphite, such as triphenoxyphosphin.

15. The aqueous preparation according to claim 1, further comprising at least one polyhydric alcohol in an amount of 0.1 to 1.5 wt.-% based on the total mass of the preparation.

16. A process for manufacturing a transfer medium comprising the steps (a) applying an aqueous preparation according to claim 1 to the front side of a base substrate, and subsequent drying; and (b) optionally applying an aqueous liquid to the reverse side of the base substrate and subsequent drying, the aqueous liquid optionally comprising a hydrophilic polymer or a salt thereof.

17. The process according to claim 16, wherein the aqueous liquid comprises a hydrophilic polymer selected from the group consisting of such as polyacrylate, starch, cellulose and derivatives thereof.

18. The process according to claim 16, wherein after drying of the preparation a coating layer having a porosity of >100 ml/min is obtained on the front side of the base substrate.

19. The process according to claim 16, further comprising (c) printing a pattern on the front side with at least one sublimable ink.

20. Transfer medium obtainable by the process according to claim 16.

21. A method for modifying an article which is optionally printed, comprising contacting an article to be modified with a transfer medium according claim 20 at an increased temperature such that the light stabilizer and any other sublimable components are transferred from the transfer medium to the article, wherein said article is a textile comprising polyester fibers.

22. Process for modifying articles, in particular textiles, wherein the article to be modified is brought into contact with the front side of the transfer medium according to claim 20 at increased temperature, such that the sublimable components on the front side are transferred from the transfer medium to the article.

23. Modified article obtainable by a process according to claim 22.

Description

EXAMPLE

(1) Preparation

(2) 100 g of water, 10 g of aqueous colloidal SiO.sub.2 (SiO.sub.2 content: 30 wt.-%), 4 g of Na.sub.2SiO.sub.3, 1 g of NaHCO.sub.3, 40 g of aqueous polyacrylic acid (polyacrylic acid content: 25 wt.-%) and 30 g of water mixed together at room temperature in the respective order to give a clear preparation. Further, 1.85 g Chimassorb 81 (2-Hydroxy-4-(octyloxy)benzophenone are added by an high-speed mixer to give a stable suspension.

(3) Manufacture of the Transfer Medium

(4) The preparation was applied to a base paper having a porosity of 300 ml/min and a grammage of 82 g/m.sup.2. The aqueous liquid was applied by using a 6 m rod and then dried at 100 C. The dry weight of the coating layer was determined to be 3 g/m.sup.2.

(5) Multi-color patterns using sublimable dyes (Sawgrass Sublijet HD) were applied to the above produced transfer medium via inkjet printer (Sawgrass SG 400). After 60 seconds, the printed transfer medium was completely dried and was used for the transfer printing process.

(6) The printed transfer medium was contacted with a piece of polyester fabric and was treated at about 200 C. for 45 seconds in a flat press at 4 bar. Following completion of the transfer print, a textile fabric with a mirror inverted inkjet pattern was obtained.

(7) For comparison, the same procedure was followed with a preparation without Chimassorb 81. Both, the example and the comparative example were subjected to xenon arc lamp treatment for 48 hours at a constant temperature of 65 C. and relative humidity of 80%. After exposure, the textile was analysed by a spectrophotometer.

(8) It has been shown that the comparative example has a higher yellow degree than the example modified with Chimossorb. The quality of the print of the Example is excellent, even after irradiation. The print of the comparative Example before irradiation is qualitatively identical to the print of the Example. However, after irradiation with the xenon arc lamp, it has been shown that the green and blue color suffered from a significant yellow tint in the comparative Example. Moreover, the color intensity measured by spectrophotometer of the comparative example was lower than of the example with Chimassorb.

(9) The example also shows that the production of a light stabilized sublimation printed article can be obtained by a process according to the present invention in a one-step procedure.

(10) The invention is further characterized by the following items: 1. Preparation comprising (i) at least one hydrophilic organic polymer, (ii) optionally at least one filler, (iii) optionally at least one water-soluble alkaline salt, (iv) at least one light stabilizer, and (v) water. 2. Preparation according to claim 1, wherein the preparation has a solid content of 15 to 50 wt.-%, preferably 20 to 30 wt.-% based on the total mass of the preparation. 3. Preparation according to any of claim 1 or 2, wherein the hydrophilic organic polymer is selected from the group consisting of polyacrylic acid, polyacrylester, polyacrylamide, polyvinyl alcohol, a copolymer comprising at least one of an acrylic acid, acrylic acid ester, acrylamide and vinyl acetate or salts thereof, preferably polyacrylic acid or a salt thereof (polyacrylate). 4. Preparation according to any of the preceding claims, wherein the at least one hydrophilic organic polymer is present in an amount of 1-50 wt.-%, preferably 2-20 wt.-% based on the total mass of the preparation. 5. Preparation according to any of the preceding claims, wherein the filler is an inorganic oxide, preferably SiO.sub.2 or TiO.sub.2, preferably in nanoparticulate or microparticulate form. 6. Preparation according to any of the preceding claims, wherein the preparation comprises from 0.2 to 10 wt.-%, preferably 1-5 wt.-% of filler based on the total mass of the preparation. 7. Preparation according to any of the preceding claims, wherein the alkaline salt is selected from hydrogen (carbonate), M.sub.2OnSiO.sub.2 with M=alkali metal, aluminate or phosphate salt, particularly water glass and sodium aluminate. 8. Preparation according to any of the preceding claims, wherein the alkaline salt is present from 0.2 to 10 wt.-%, preferably 1-5 wt.-%, based on the total mass of the preparation. 9. Preparation according to any of the preceding claims, wherein the light stabilizer is selected from a UV absorber, a light quencher, a radical scavenger, a secondary anti-oxidant and a peroxide decomposer, and is preferably present in an amount of 0.001-5 wt.-%, preferably 0.1-2 wt.-% based on the total mass of the preparation. 10. Preparation according to any of the preceding claims, wherein the light stabilizer sublimates at a temperature in the range of 140-220 C. 11. Preparation according to any of the preceding claims, wherein the light stabilizer is non-ionic and is preferably water-insoluble. 12. Preparation according to any of the preceding claims, wherein the light stabilizer is free of carboxylic or sulfonic groups. 13. Preparation according to any of claims 9-12, wherein the UV absorber dissipates the absorbed irradiation as thermal energy. 14. Preparation according to any of claims 9-13, wherein the UV absorber is based on benzophenone, benzotriazole, oxalanilide, phenyltriazine, and derivatives thereof. 15. Preparation according to claim 14, wherein the UV absorber is selected from (2-hydroxyphenyl)benzotriazole (BTZ), hydroxyphenyl-s-triazine (HPT), 2-hydroxybenzophenone (BP), oxalanilide, Benzotriazole-1 (2-(2-hydroxy-3-tert-butyl-5-propionicacidisooctylester)-2H-benzotriazole), Benzotriazole-2 (2-(2-hydroxy-3,5-di-tert-amylphenyl)-2H-benzotriazole), Benzotriazole-3 (reaction product of 2-(2-hydroxy-3-tert-butyl-5-propionic acid methyl ester)-2H-benzotriazole and polyethylene glycol 300), Benzotriazole-4 (2-[2-hydroxy-3,5-di(1,1-dimethylbenzyl)phenyl]-2H-benzo-triazole), HPT-1 (2-{4-[(2-hydroxy-3-dodecyloxy/tridecyloxypropyl)oxy-2-hydroxyphenyl]}-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine), HPT-2 (2-[4-(2-hydroxy-3-(2-ethylhexyl)oxy-2-hydroxyphenyl)]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine), HPT-3 (2-(4-octyloxy-2-hydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine), Benzophenone-1 (2-hydroxy-4-octyloxybenzophenone), Benzophenone-2 (2-hydroxy-4-dodecyloxybenzophenone), and Oxalanilide-1 (N-(2-ethoxyphenyl)-N-(4-isododecylphenyl)ethanediamide). 16. Preparation according to any of claims 9-12, wherein the radical scavenger is selected from phenol and its derivatives and hindered amine light stabilizers (HALS), particularly based on piperidine and its derivatives. 17. Preparation according to claim 16, wherein the hindered amine light stabilizer is selected from HALS-1 (bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate), HALS-2 (bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate), HALS-3 (bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)sebacate), HALS-4 (bis(1,2,2,6,6-pentamethyl-4-piperidinyl)[3,5-bis(1,1-dimethylethyl-4-hydroxyphenyl)methyl]butylpropandioate), HALS-5 (N-(1,2,2,6,6-pentamethyl-4-piperidinyl)-2-dodecsyulccinimide), HALS-6 (N-(1-acetyl-2,2,6,6-tetramethyl-4-piperidinyl)-2-dodecylsuccinimide), and HALS-7 (N-(2-hydroxyethyl-2,2,6,6-tetramethylpiperidine-4-ol succinic acid copolymer). 18. Preparation according to any of the preceding claims, wherein the quencher is selected from organic nickel compounds. 19. Preparation according to any of the preceding claims, wherein the secondary anti-oxidant is based on phosphite or thioether, such as triphenoxyphosphin. 20. Preparation according to any of the preceding claims, further comprising at least one polyhydric alcohol such as glycerol, preferably in an amount of 0.1 to 1.5 wt.-% based on the total mass of the preparation. 21. Use of a preparation according to any of claims 1-20 for the production of a transfer medium, wherein the front side of a base substrate is coated with such preparation. 22. A process for manufacturing a transfer medium comprising the steps (a) applying a preparation according to any of claims 1-20 to the front side of a base substrate, and subsequent drying; and (b) optionally applying an aqueous liquid to the reverse side of the base substrate and subsequent drying, the aqueous liquid optionally comprising a hydrophilic polymer or a salt thereof. 23. The process according to claim 22, wherein the base substrate is selected from the group consisting of paper, plastic and metal. 24. The process according to any of claim 22 or 23, wherein the aqueous liquid comprises a hydrophilic polymer such as polyacrylate, starch, cellulose or derivatives thereof. 25. The process according to any of claims 22-24, wherein the preparation and optionally the aqueous liquid is each applied to the base substrate in an amount of 10-40 g/m.sup.2, preferably 15-25 g/m.sup.2. 26. The process according to any of claims 22-25, wherein after drying of the preparation a coating having a dry weight of 0.2 to 25 g/m.sup.2, preferably 2.5 to 8 g/m.sup.2, is obtained on the front side of the base medium. 27. The process according to any of claims 22-26, wherein after drying of the preparation a coating layer having a porosity of >100 ml/min is obtained on the front side of the base medium. 28. The process according to any of claims 22-27, which further comprises step (c) printing a pattern on the front side with at least one sublimable ink, preferably by inkjet printing. 29. Transfer medium obtainable by the process according to any of claims 22-28. 30. Use of a transfer medium, which is optionally printed, according claim 29 for modifying articles, in particular textiles. 31. Use according to claim 30, wherein the article is a textile fabric, particularly comprising polyester fibers. 32. Process for modifying articles, in particular textiles, wherein the article to be modified is brought into contact with the front side of the transfer medium according to claim 29 at increased temperature, such that the sublimable components on the front side are transferred from the transfer medium to the article. 33. Modified article obtainable by a process according to claim 32.