Bleaching and dyeing; fluid treatment and chemical modification – Dry dye composition other than mere mixture of two or more... – Dye in specified form other than mere powder
Patent
1989-03-17
1991-05-21
Clingman, A. Lionel
Bleaching and dyeing; fluid treatment and chemical modification
Dry dye composition other than mere mixture of two or more...
Dye in specified form other than mere powder
8543, 8561, 8562, 8680, C09B 6708
Patent
active
050171950
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a dye having a specified form. More particularly, the invention relates to a non-dustable granular dye coated with a specified chemical agent.
BACKGROUND ART
Dyes have hitherto been commercialized in a wet state such as liquids, pastes, etc. or in a dry state such as grains, powders, etc. Particularly, those dyes which are difficult to convert into liquids or pastes because of decomposition or the like in a wet state, such as reactive dyes, have been commercialized mainly in a dry form. Powdery dyes, however, are liable to generate the problem of flying away, or dusting, when being handles, with the result of adhesion to equipment or the workers, thereby worsening work environment. To obviate the worsening of the work environment, it is inevitable to make a great investment in plant and a great deal of labor for dust collector, dust-proof clothing, cleaning of equipment, etc. Furthermore, the powdery dyes tend to cause dusting also at the time of weighing, with the result of contamination of the workers or equipment, thereby leading to sanitary problems, economic loss associated with cleaning, and so on. To improve the defects of the powdery dyes, there has been attempted granulation, typically graining, of the dyes. The granular dyes thus obtained, however, have also the problem of dusting due to collapse of the particles during transportation, weighing, dissolution or the like thereof. Besides, for the progress of automation of handling of the dyes, such as automatic packing and automatic weighing, it has been requested to develop a form of dye suitable for the automation of handling.
DISCLOSURE OF INVENTION
As a result of the present inventors' studies for solving the above-mentioned problems, it has been found that when an ordinary granular dye obtained by granulation of a dye together with a binder is coated with a specified chemical agent, it is possible to obtain dye particles which have an extremely low possibility of dusting, no possibility of polluting work environment, and high adaptability to the automation of handling of the dye. Based on the finding, the present inventors have completed the invention.
According to the present invention, there is provided a non-dustable granular dye obtained by coating the particles of a granular dye with a coating agent selected from the group consisting of water-soluble high molecular substances, monosaccharides and oligosaccharides.
BEST MODE FOR CARRYING OUT THE INVENTION
The dye for use in the present invention may be any kind of dye which can be made into a granular form, for instance, commercially available dyes such as disperse, cationic, acid, reactive, direct, sulphur and fluorescent dyes, more specific examples being found in Color Index (3rd Ed.), etc.
The method of making dye into a granular form may be either a dry granulation process or a wet granulation process. Ordinarily, a wet granulation process as described below is used. The wet granulation process comprises the steps of adding 0 to 2 parts by weight of a binder and 20 to 40 parts by weight of water to 100 parts by weight of the above-mentioned dye, kneading the resultant admixture, then simultaneously performing shaping and drying by a spray dryer, or once shaping the kneaded admixture into a specified form by a granulating machine followed by drying at 50.degree. to 130.degree. C., and thereafter subjecting the granular dye to screening by sieving to obtain the granular dye having a predetermined particle diameter.
The binder mentioned above may be a water-soluble high molecular-weight substance such as starch, dextrin, sodium alginate, gelatine, carboxymethyl cellulose, hydroxypropyl cellulose, polyvinyl alcohol, sodium acrylate, polyvinyl pyrrolidone, etc., a monosaccharide such as glucose, fructose, etc., or an oligosaccharide such as sucrose, lactose, etc. Two or more of these substances may be used in combination, and it is convenient to add the binder to the dye in the state of a 1-10% (by weight) aqueous solution.
A metho
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Ogawa Fumio
Satou Fumitaka
Clingman A. Lionel
Nields Henry C.
Nippon Kayaku Kabushiki Kaisha
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