Claims
- 1. In a dry heat transfer printing process which comprises
- A. bringing a treated face of an auxiliary carrier into contact with the surface of an organic material to be dyed, the treated face of the auxiliary carrier being dry and bearing at least one color layer which contains dyestuff which passes into the vapor state under the transfer process conditions,
- B. subjecting the carrier and the material while contacted to the action of heat for a sufficient time to effect transfer of the vaporizable dyestuff from the auxiliary carrier to the organic material to be dyed, and
- C. separating the organic material from the auxiliary carrier,
- the improvement according to which at least one color layer of the said auxiliary carrier contains at least one transferable salt of a cationic dyestuff with an acid having a pK.sub.s value greater than 3.
- 2. A process according to claim 1, wherein at least one printing ink which contains at least one salt of a cationic dyestuff with an acid having a pK.sub.s value greater than 3, optionally a binder which is stable below 230.degree. C, water and/or an organic solvent, is applied to an inert carrier and dried, the treated side of the carrier is brought into contact with the surface of the organic material to be dyed, the carrier and material are subjected to the action of heat for 5 to 60 second at 120.degree. to 210.degree. C, and the dyed material is removed from the carrier.
- 3. A process according to claim 2, wherein as cationic dye salt there is used a salt of a lower aliphatic monocarboxylic or dicarboxylic acid.
- 4. A process according to claim 3, wherein as cationic dye salt there is used a salt of a lower aliphatic monocarboxylic acid.
- 5. A process according to claim 4, wherein the salt of a lower aliphatic monocarboxylic acid is selected from the group consisting of formates, acetates and lactates.
- 6. A process according to claim 4, wherein a salt of an inorganic acid having a pK.sub.s value greater than 3 is used.
- 7. A process according to claim 6, wherein a cyanuric acid salt of a cationic dyestuff is used.
- 8. A process according to claim 6 wherein the salt is a member of the group consisting of cyantes, thiocyanates and cyanides.
- 9. A process according to claim 6, wherein the salt is a member of the group consisting of phosphates, phosphites, borates, sulphites, silicates, carbonates, bicarbonates, chromates, fluorides, aluminates, sulphides and iodates.
- 10. A process according to claim 2, wherein a sulphonic or sulphinic acid salt of a cationic dyestuff is used.
- 11. A process according to claim 10 wherein a methanesulphonate or methanesulphinate is used.
- 12. A process according to claim 2, wherein an alcoholate, phenolate, or thiophenolate of a cationic dyestuff is used.
- 13. A process according to claim 2, wherein the printing ink consists of at least one salt of a strong inorganic acid or of a metal halide double salt of a cationic dyestuff and an alkaline earth or alkali salt of an acid having a pK.sub.s value greater than 3, and optionally an organosoluble binder which is stable below 230.degree. C, in the form of a suspension in a hydrophobic organic solvent.
- 14. A process according to claim 13, wherein the printing ink contains as alkali salt of an acid having a pK.sub.s value greater than 3, trisodium phosphate, sodium tripolyphosphate, sodium pyrophosphate, sodium phosphite, sodium tetraborate, sodium metaborate, sodium sulphite, potassium metasilicate, sodium carbonate, sodium bicarbonate, potassium chromate, sodium fluoride, sodium sulphide, potassium sulphide, potassium iodate, sodium cyanide, sodium cyanate, potassium thiocyanate, sodium methanesulphate, sodium methanesulphinate, lithium, sodium or potassium acetate, sodium formate, sodium lactate, sodium methanolate, potassium ethanolate, sodium or potassium phosphate or thiphosphate.
- 15. A process according to claim 13, wherein the printing ink contains in addition at least one disperse dyestuff which passes over into the vapour state to at least 60 % in less than 60 seconds at atmospheric pressure between 160.degree. and 220.degree. C.
- 16. A process according to claim 2, wherein polyacylonitrile or modacryl fibers are used as organic material which can be dyed with cationic dyestuffs.
- 17. A process according to claim 2, wherein the inert carrier and the organic material to be dyed are subjected to the action of heat for 10 to 40 seconds at 170.degree. to 190.degree. C.
- 18. An auxiliary carrier for carrying out the dry heat process according to claim 2, which comprises an inert, flexible, heat stable sheet material having applied to at least one face thereof at least one dyeing preparation comprising at least one salt of a strong inorganic acid or of a metal halide double salt of a cationic dyestuff and an alkaline earth alkali salt of an acid having a pK.sub.s value greater than 3 and optionally a binder which is stable below 230.degree. C in the form of a suspension in a hydrophobic orgainc solvent.
- 19. An auxiliary carrier for carrying out the dry heat process according to claim 13, which comprises an inert, flexible, heat stable sheet material having applied to at least one face thereof at least one printing ink comprising at least one salt of a strong inorganic acid or of a metal halide double salt of a cationic dyestuff and an alkaline earth alkali salt of an acid having a pK.sub.s value greater than 3, and optionally a binder which is stable below 230.degree. C in the form of a suspension in a hydrophobic organic solvent.
- 20. An auxiliary inert carrier according to claim 18, which consists of paper an aluminum foil or steel.
- 21. An auxiliary carrier according to claim 20, wherein cellulose parchment paper is employed.
- 22. An auxiliary carrier according to claim 18, which is treated with at least one organic printing ink which contains a cellulose ether or ester as binder, or with at least one aqueous printing ink which contains polyvinyl alcohol as binder.
Parent Case Info
This application is a continuation of application Ser. No. 416,766, filed Nov. 19, 1973, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
1799754 |
Lawrence |
Apr 1931 |
|
2040075 |
Brower |
May 1936 |
|
2067435 |
Chatfield et al. |
Jan 1937 |
|
2634677 |
Klinkowski et al. |
Apr 1953 |
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Non-Patent Literature Citations (1)
Entry |
Moore, JSDC, Sept., 1974, pp. 318-325. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
416766 |
Nov 1973 |
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