Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1996-07-18
1997-12-16
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 89, 524 90, 524161, 524162, 524163, 524719, 524720, C08K 542
Patent
active
056986181
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a coating composition which excels in nonflocculation properties, noncrystallizability, fluidity and the like, has a clear color tone and high gloss, and has sufficient hardness of a coating film. More specifically, the present invention relates to a coating for a vehicle.
BACKGROUND TECHNOLOGY
Acid-set coatings, which contain acidic catalysts in the coatings and are set by heat, have coating films which excel in weather-resistance and the like. It is difficult for acidic rain, which has become a problem in our society in recent years, to corrode acid-set coatings, and thus such coatings have been used as coatings for vehicles.
However, because acid-set coatings contain an organic solvent, air pollution or the like is caused thereby. As countermeasures against this phenomenon, high solids coatings have been developed in which the amount of the organic solvent contained in the coating has been reduced.
In high solids acid-set coatings, there exists a drawback in that, with an increase in the coating viscosity due to a reduction in the contained amount of the organic solvent, the coating properties deteriorate. For this reason, prohibiting an increase in coating viscosity and improving the coating properties have been attempted by reducing the molecular weight of a resin forming the coating, or by completely etherifying an amino resin, or by other measures.
However, when a resin having a relatively low molecular weight is used, it is difficult to sufficiently disperse pigments, as will be described later.
On the other hand, when the amino resin is completely etherified, the reactivity inherent in the coating deteriorates. As a result, there arises a drawback in that the setting of the coating is slower than the setting of conventional acid-set coatings.
Therefore, it is necessary to either increase the amount of acid catalyst or use a strong acid catalyst in order to promote the setting of the coating.
However, when an acid-set coating to which a large amount of acid catalyst or a strong acid catalyst has been added is used, a drawback also arises in that the pigment dispersion stability of the acid-set coating becomes poor.
Thus, it is desirable to develop effective pigment dispersants and pigment compositions.
Conventionally, in various technical fields of pigment dispersion, various pigment dispersants have been used such as pigment derivatives or the like. Among these pigment dispersants, pigment derivatives having basic substituents (which will be hereinafter referred to as basic pigment derivatives), and basic-group-containing resin-type pigment dispersants obtained by binding a basic substance with a polyester, an acrylic polymer, or the like are remarkably effective in general coatings.
However, in an acid-set coating, the basic pigment derivatives or the basic-group-containing resin-type pigment dispersant interact with the acid catalyst, and pigment dispersion cannot be effectively performed. In addition, catalytic activity deteriorates and a drawback arises in that the setting of the coating is impeded, or the like.
Further, an aluminum salt of a pigment derivative having a carboxyl group is disclosed as an organic dyestuff derivative having an acidic functional group (which will be hereinafter referred to as an acid-organic dyestuff derivative) in Japanese Patent Application Publication (JP-B) No. 64-5070.
However, even when an acid-organic dyestuff derivative has been used, hardly any effect on improving the dispersibility of the pigment in an acid-set coating has been exhibited.
Moreover, a pigment derivative having a sulfone group is disclosed as the acid-organic dyestuff derivative in Japanese Patent Application Laid-Open (JP-A) No. 5-98200.
The pigment derivative having a sulfone group has exhibited excellent effects of dispersibility with respect to base resins of a relatively high molecular weight. However, a sufficient effect of dispersibility cannot be exhibited with respect to low-molecular-weight resins which have a weight average mo
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Itabashi Tadashi
Kamikubo Takashi
Kuwahara Masami
Hoke Veronica P.
Toyo Ink Manufacturing Co. Ltd.
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