Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1992-10-19
1995-05-09
Bell, Mark L.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106412, 106499, 524612, C09B 6710
Patent
active
054136326
DESCRIPTION:
BRIEF SUMMARY
SUBJECT MATTER OF THE INVENTION
The present invention relates to pigments exhibiting improved properties, especially gloss and fastness. The invention also relates to a process which makes it possible to obtain such pigments and to their use in paints.
SUMMARY OF THE STATE OF THE ART
Organic pigments, in particular azo pigments, find a wide application in the paint industry. The advantage of these pigments is the wide color range which they permit and their moderate cost in the case of a high coloring power. However, they generally have an opacity which is too weak to be employed by themselves, and insufficient fastness.
Techniques for increasing their opacity are known in the case of these pigments; such treatments consist especially in heating in the presence of a solvent or in an aqueous medium at a high temperature; these treatments can especially be accompanied by a purification in an alkaline medium. Such treatments are described, for example, in the following patents: DE-3 128 057 FR-2 214 730, FR-2 117 428, FR-2 432 578, U.S. Pat. No. 3,991,044.
However, these products have certain disadvantages; the lack of gloss and the tendency to flocculation or to floating may be mentioned in particular. Finally, their fastness to light and to inclement weather (especially to the sulphur dioxide present in industrial atmospheres), while generally improved by the abovementioned treatments, frequently remain still insufficient for use in high-performance paints such as, for example, those intended for car bodywork.
OBJECTIVES OF THE INVENTION
The present invention is therefore aimed at improving the properties of organic pigments, especially of azo pigments, in paints, especially gloss, resistance to flocculation or floating and fastness to light and to inclement weather.
Characteristic features of the invention and technological background
The invention relates to an organic pigments, preferably an azo pigment, characterized in that it has been treated, with a view to improving its paint characteristics with the aid of polyalkyleneimine. This treatment can be performed both on an organic pigment otherwise treated using knownmethods and on an untreated pigment. However, it is generally preferred to employ a treated pigment, particularly when a maximum capacity is sought.
The treatment technique to be used will be described in greater detail below, as will the use of the abovementioned products in paints.
Among the polyalkyleneimines, polyethyleneimine (homopolymer of aziridine) is a commercial product employed especially in the paper industry as dispersing agent for fillers and inorganic pigments and to increase resistance to water.
It is also employed as an adhesion promoter in printing inks and has also been proposed for treating siliceous fillers in vulcanization processes described in U.S. Pat. No. 3,953,223 and for treating carbon black with a view to increasing the selective adsorption of CO.sub.2, that is to say modifying the active nature of this product as indicated in documents U.S. Pat. No. 4,771,089 and JP-63 259 927.
Finally, products of reaction of polyethyleneimine with other polymers have been proposed as dispersing agents.
However, these uses did not make it possible to foresee that this product was capable of treating organic pigments and improving their properties. Quite to the contrary, a manufacturing company (BASF) advises against its use in inks when the latter contain certain azo pigments which include Pigment Red 48:4 of the Color Index, which forms the subject of examples 1 to 5 below, (see BASF notice: ref. Ti/P 3052 d: "Polymin(R) Wasserfrei": Technische Information, BASF September 1988).
In addition, polyethyleneimine is in most cases incompatible with paints containing solvents and its addition at the time of the milling of the pigments or the finished paint does not in any way yield the results indicated below.
Polyethyleneimine is a commercial product sold especially under the trademarks "Polymin" of the company BASF, "Epomin" of the company Nippon Shokubai, or "Corcoat"
REFERENCES:
patent: 3991044 (1976-11-01), Conley
patent: 4595417 (1986-06-01), Murakami et al.
patent: 5034508 (1991-07-01), Nishizaki et al.
Mayer Jean
Vermoortele Frank
Bell Mark L.
Bonner C. M.
Colour Research Company (CORECO) Ltd.
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