Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-10-09
2000-12-12
Jagannathan, Vasu
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524555, 526263, C09D 1116, C08F22602, C08F22606, C08L 3900, C08L 3904
Patent
active
061600350
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an oil base pigment ink composition for writing tools, more specifically to an oil base pigment ink composition for writing tools which has fluidity suitable to writing tools having a discharge mechanism making use of a capillary phenomenon and is excellent in dispersion stability and which has such characteristics as causing no clogging at felt-made pen points, fiber-made pen points and plastic-made pen points.
BACKGROUND ART
An oil base ink can write on both surfaces of ink-absorbing materials such as paper and cloth and ink-non-absorbing materials such as plastics, glass and metal. In addition, since it has a quick drying property, it is widely used as an oil base ink for writing tools.
In particular, since an ink using a pigment as a colorant is excellent in handwriting fastness, it is generally known as a paint marker and used not only in homes, schools and offices but also in various industrial fields. Carbon black is used as a pigment for a black ink.
However, since an oil base pigment ink composition using carbon black does not provide a sufficient discharge amount to writing tools having a discharge mechanism making use of a capillary phenomenon because of a high viscosity thereof and causes writing starving, a valve mechanism is employed in the paint marker to secure the discharge amount.
The ink described above causes phenomena such as flocculation and precipitation of carbon black while being used over a long period of time, which results in deteriorating the fluidity and bringing about clogging at a pen point. Accordingly, conventional paint markers employ a redispersing method in which a stirring member such as a metal ball is put into an ink reservoir together with an ink and have a complicated structure in combination with a valve mechanism, which has brought about problems that many parts are required and that the assembly work steps are complicated and the cost is high.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide an oil base pigment ink composition for writing tools which does not have to employ such complicated structure as those of conventional paint markers. That is, an object of the present invention is to provide an oil base pigment ink composition for writing tools which has fluidity suitable to writing tools having a discharge mechanism making use of a capillary phenomenon and is excellent in dispersion stability and which has such characteristics as causing no clogging at felt-made pen points, fiber-made pen points and plastic-made pen points.
The present inventors have successfully obtained an intended oil base pigment ink composition for writing tools described above by incorporating at least a pigment, a basic resin having an amino group and a solvent and have come to complete the present invention.
That is, the oil base pigment ink composition for writing tools of the present invention is characterized by comprising at least a pigment, a basic resin and an alcohol base solvent and/or a glycol ether base solvent.
The dye described above is preferably carbon black. The basic resin described above is a resin copolymerized monomers containing at least one selected from a vinyl monomer having a heterocyclic amino group, a vinyl monomer having an aliphatic primary amino group, a vinyl monomer having an aliphatic secondary amino group or a vinyl monomer having an aliphatic tertiary amino group and is preferably a copolymer resin having a weight average molecular weight of 50000 or less.
It is not clear why the oil base pigment ink composition for writing tools of the present invention has good fluidity and excellent dispersibility and does not cause clogging at a pen point, but it is presumed that the adsorption of the resin onto the surface of carbon black is particularly strengthened by interaction among the respective components of the pigment, the basic resin and the alcohol base solvent and/or the glycol ether base solvent and by virtue of the above specific basic resin used in the present i
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Jagannathan Vasu
Mitsubishi Pencil Kabushiki Kaisha
Shosho Callie E.
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