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
1984-03-09
1985-07-23
Griffin, Ronald 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...
106 20, 260DIG38, 523160, 523161, C09D 1102, C09D 1110
Patent
active
045309612
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an aqueous suspension or dispersion of carbon black and, more especially to an aqueous suspension of carbon black the particles of which are grafted with chemically bonded hydrosoluble polyolefinic chains, preferably polymers or copolymers of acrylic monomers and, more particularly, ammonium and alkali metal polyacrylates. In the present disclosure, the word "polyolefine" designates free radical polymerizable double-bonded monomers carrying water solubilizing functions. Details on such monomers are provided hereafter.
The invention also concerns a method for preparing such an aqueous suspension and the use thereof for manufacturing ink compositions, namely inks for jet-printing with jet-printing machines.
It is well known that jet-printing imposes certain difficulties depending upon the ink compositions to be used. For instance, such inks must have a high optical density, i.e. contain a relatively high concentration of carbon-black and simultaneously show a very low viscosity and surface tension, i.e. of the order of 1.5 to 10 cP and 30 to 50 dynes.cm, respectively. Also, the carbon-black particles ought to be very fine so as to preferably pass freely through fine filters, e.g. 1 to 50.mu. mesh filters. Further, in such suspensions, the carbon-black particles should not settle with time, i.e. they should remain in suspension for extended periods.
Carbon-black being essentially hydrophobic, attempts have been made to attain the above-mentioned properties by grafting water soluble polymeric radicals onto the carbon black particles thus making them water compatible and freely dispersible in water.
Thus, in Japanese (opi) Patent Application No. 80,147561 (C.A. 94, 192963) there is disclosed the grafting of carbon black particles with acrylic acid in ethanol in the presence of .alpha.,.alpha.'-azoisobutyronitrile (AIBN) and under irradiation. The thermal grafting and polymerization of acrylate esters on carbon black is also disclosed in C.A. 94, 48453. In Japanese (opi) Application No. 74,81038, there is disclosed the polymerization and grafting of styrene on carbon black in the presence of AIBN at 140.degree. C. (C.A. 82, 163002) and in Japanese Patent Publication No. 74,11557 (C.A. 81, 106311) there is disclosed the polymerization and grafting on carbon black of acrylonitrile in the presence of AIBN in DMF. In DOS 2,130,617 (C.A. 76, 113947), there is described the direct grafting on carbon black of prepolymerized monomers and in Japanese Patent Publication No. 71,26970 as well as in GB-A-No. 1,191,872, there is described the manufacture of carbon black with grafted acrylic acid and butyl acrylate copolymers in methyl-isobutylketone and other organic solvents. Such grafted carbon black can be easily dispersed in aqueous ammonia solutions.
In GB-A No. 1,421,529 there is disclosed the suspension polymerization into granules of olefinically unsaturated monomers in aqueous media in the presence of carbon black and appropriate surfactants. After polymerization, the formed polymer beads having the carbon black incorporated therein are separated from the water phase and expanded.
The above techniques are effective but they either provide no homogeneously dispersed hydrophilized carbon black particles or they rely on the use of organic or aqueous-organic solvants for undertaking the grafting of the carbon black particles. Yet, when such grafted particles must be used in aqueous jet-ink formulations, the organic solvents must first be removed and the particles must be redispersed in the aqueous media suitable for such inks. Now, it has been found that such a method is tedious and that the grafted particles do not disperse sufficiently well in the jet-ink formulations for providing compositions suitable for being used in jet-printing machines.
Consequently, it was desirable that grafting and polymerization be carried out in water in such manner that a suitable aqueous dispersion or suspension of grafted carbon black be obtained which, afterwards, can be directly converted into a jet-ink
REFERENCES:
patent: 3903034 (1975-09-01), Zabiak et al.
patent: 3904568 (1975-09-01), Yamaguchi et al.
patent: 3919150 (1975-11-01), Kiel et al.
patent: 4018728 (1977-04-01), Priest
patent: 4395515 (1983-07-01), Dinklage et al.
Chemical Abstracts, vol. 76, No. 4, Jan. 24, 1972, abstract No. 15400Y.
Chemical Abstracts, vol. 79, No. 24, Dec. 17, 1973, abstract No. 138303P.
Bellmann Gunter
Boussel Francoise
Nguyen Van T.
Battelle (Memorial Institute)
Dubno Herbert
Griffin Ronald W.
Ross Karl F.
LandOfFree
Low viscosity stable aqueous dispersion of graft carbon black does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low viscosity stable aqueous dispersion of graft carbon black, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low viscosity stable aqueous dispersion of graft carbon black will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-635026