Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-08-22
2000-12-26
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524848, 106311, 106 3113, C09D 1102, C08K 501, C08K 503
Patent
active
061661260
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention concerns solutions of resins and solvents, which are suitable as binding-agent solutions for printing inks, particularly for rotation printing processes with high printing speeds. Such solutions are known from DE A 4,010,319, in which a mineral-oil fraction with a boiling range of 200-450.degree. C. serves as a solvent and, as binding agents, aromatic polymers with a softening point of 30-120.degree. C.
These solutions are in any case unsuitable for high printing speeds. Corresponding printing inks bleed through very easily or cause a counterpressure during subsequent stacking.
To avoid this, it is necessary to use polymers or resins with a softening point above 120.degree. C.
The aromatic polymers, which actually impart a good characteristics profile to the printing inks, are however no longer soluble in mineral oils, when they are so highly polymerized that their softening point lies above 120.degree. C.
The additional use of crosslinking aids, which could solve this problem, is undesirable, because the crosslinking aids result in water pollution after deinking, when the paper is recycled.
The use of aromatic oils as solvents requires disclosure, due to the content of potentially carcinogenic polycylic aromatics, and is therefore not feasible. Moreover, aromatics, such as arylaromatic compounds, exhibit overly good compatibility with the aromatic polymers. The polymer penetrates with this polymer into the paper, carrying corresponding pigment and printing ink along with it, and leads to migration and bleeding effects.
SUMMARY OF THE INVENTION
It is therefore the goal of the invention to produce binding-agent solutions for printing inks, which permit high printing speeds, with exhibiting bleeding, counterpressure and smearing effects, which require no crosslinking aids and contain no compounds requiring disclosure above the corresponding limits.
The solution to this problem is the result of binding-agent solutions according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
It was found that aromatic polymers (resins) with a softening point above 120.degree. C. dissolve in a mixture of mineral oils and alkylaromatics. Such solutions, which contain 10-70% by weight of one or more aromatic polymers with a softening point above 120.degree. C. in a solvent mixture consisting of a mineral-oil fraction with a boiling range of 200-550.degree. C. and consist of alkylaromatics, in which case the aromatic-carbon content of the mixture lies in the range of 20-60% by weight of the total carbon, are excellently suitable as binding-agent solutions for printing inks, especially for those used at extremely high printing speeds. On the one hand, the solutions are stable, but separation takes place on the other hand very quickly on contact with an absorbent material, for example, paper. While the solvent mixture penetrates very quickly into the bottom and is distributed very quickly in the absorbent substrate, the resin as well as the pigment bound by the resin remain on the surface of the absorbent material. In other words, during printing, a clear image arises immediately, which does not bleed through with high printing speeds, without the appearance of migration effects, counterpressure or smearing effects.
The invented binding-agent solutions contain accordingly 10-70% by weight, especially 15-45% by weight of one or more aromatic polymers. Usable are highly polymerized polymers of unsaturated compounds with an aromatic or quasi aromatic base, such as indene, dicyclopentadiene, vinyltoluene, methylindene, aromatic hydrocarbon, alpha-methylstyrene and styrene resins or resin residues, for example, residues from visbreakers or ethylene crackers, from the synthesis of styrene, phenol, ethyl benzene or dimethyl terephthalate. They have a softening point above 120.degree. C., i.e. preferably in the 121-180.degree. C. range, especially in the 125-165.degree. C. range, and are essentially free of polycyclic, aromatic compounds.
Employed as a mineral oil, per the
REFERENCES:
patent: 4252699 (1981-02-01), Tsuchiya et al.
Knips Ulrich
Volkmann Norbert
Zellerhoff Robert
Egwim K C
Wu David W.
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