Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-06-24
1982-11-02
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
106 22, 106 31, 106 325, 524275, 524277, 524474, 524570, C09D 1300
Patent
active
043574319
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a ball-point pen ink which can easily be erased by an ordinary rubber eraser.
BACKGROUND ART
Ball-point pen ink compositions which have conventionally been used comprise a dye or pigment as colorant, a resin (a ketone resin or xylene resin), a high-boiling solvent (phenyl Cellosolve, phenyl glycol, benzyl alcohol or the like) and various additives. When letters or lines are written on paper with such conventional ink, the ink permeates even in the interiors of fibers of paper and the ink dyes the fibers or is adsorbed on the fibers. Accordingly, written letters or lines cannot be erased by an ordinary rubber eraser. As means for erasing such ball-point pen ink traces, there have been adopted a chemical decomposition method in which the colorant is decomposed by oxidation and a physical method in which traces are rubbed off by a sand-incorporated rubber eraser. The chemical decomposition method, however, is defective in that the majority of colors, inclusive of colors of inks comprising a pigment as the colorant, cannot be erased and, even when certain erasable colors are employed, yellowing is caused after removal of the colors. Furthermore, the physical method is defective in that although erasing is possible, the paper surface is rubbed off at the erased part and in case of thin paper, breakage of the paper is readily caused by the erasing operation. Accordingly, no satisfactory erasing effect can be attained by any of these erasing methods.
Recently, a ball-point pen ink erasable by an ordinary rubber eraser has been developed. For example, a ball-point pen ink of this erasable type comprising a natural rubber, a low-boiling solvent, a high-boiling solvent and pigment particles as colorant is known (U.S. Pat. No. 4,097,290). Although traces of such ball-point pen ink can be erased by a rubber eraser within several hours from the time of writing, these traces, like traces of conventional ball-point pen inks, cannot be erased by a rubber eraser after passage of a few days. Furthermore, this ball-point pen ink is defective in that the speed of drying of the ink just after writing is very low and the ink is left sticky. Therefore, if other paper is placed on the written surface, both the papers adhere to each other. Moreover, since the applied ink just after writing is readily peeled from the paper surface, if traces are touched by a hand or finger just after writing, the paper surface or the hand or finger becomes dirty with the ink.
DISCLOSURE OF INVENTION
It is therefore a primary object of the present invention to provide a ball-point pen ink composition capable of providing dense and clear traces which can easily be erased by a rubber eraser even after passage of several days after writing, are not sticky at all even just after writing and do not cause adherence of papers even if other paper is placed on the written surface, and which has a good fixing property just after writing, so that even if traces are touched by a hand or finger just after writing, the hand or finger does not become dirty at all.
In accordance with the present invention, there is provided a ball-point pen ink composition erasable by a rubber eraser, which comprises, as indispensable components, at least a polymeric substance selected from a group consisting of polyisobutylene and ethylene-propylene copolymer, a wax which is solid or semi-solid at room temperature, pigment particles and a low-boiling solvent having a boiling point lower than 200.degree. C.
The polyisobutylene or ethylene-propylene copolymer that is used in the present invention (hereinafter referred to as "polymeric substance") not only acts as a film-forming substance but also exerts a function of covering the surfaces of pigment particles and preventing the pigment particles from permeating into the interiors of fibers of paper. Since such polymeric substance is poor in the adhesiveness and contains no unsaturated bond in the chemical structure thereof, the polymeric substance is chemically stable. The poly
REFERENCES:
patent: 3875105 (1975-04-01), Daugherty et al.
patent: 4097290 (1978-06-01), Muller et al.
patent: 4158571 (1979-06-01), Lynch et al.
Miyashita Hiroshi
Murakami Nobuyuki
Marquis Melvyn I.
Pentel Kabushiki Kaisha
LandOfFree
Ball-point pen ink composition erasable by rubber eraser does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ball-point pen ink composition erasable by rubber eraser, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ball-point pen ink composition erasable by rubber eraser will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-624619