Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Identified solvent or dispersant for color-former – other...
Patent
1992-03-10
1993-11-23
Schwartz, Pamela R.
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Identified solvent or dispersant for color-former, other...
503215, 503216, 503224, 503225, B41M 5165
Patent
active
052644090
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a pressure-sensitive copying material. Particularly, the invention relates to an excellent pressure-sensitive copying material which has an excellent color developing rate, little odor, and neither offset nor bleeding.
2. Background Art
Heretofore, pressure-sensitive copying materials have been well known. For example, to one sheet of paper are applied microcapsules enclosing a solution of a colorless electron-donating color former (hereinafter referred to as "color former"), and to another sheet of paper is applied an electron-accepting developer (hereinafter referred to as "color developer") such as acidic inorganic materials, polymeric materials or aromatic carboxylic acids which can produce colors upon reacting with the above color former. When copying materials are used, the treated surfaces of the above-mentioned set of sheets are put together face to face and pressure is applied to the paired sheets, thereby obtaining duplicate recordings.
The recording mechanism of the type described above is such that the microcapsules are ruptured by the pressure of handwriting or the impact of typewriting to release the color former solution. The solution comes into contact with the color developer on the opposing surface of the other sheet of paper to produce a color. In another type of known recording material, these materials having color forming function are applied to one side of a sheet of paper.
The color former solution that is used for the recording material of this kind is a solution of an electron-donating color former in one or more kinds of hydrophobic solvents. The hydrophobic solvents employed here are required to have the properties as follows: former solution, rate is high, images even after they are left to stand for a long period of time,
In the prior art, diarylalkanes such as phenylxylylethane and phenylethylphenylethane, alkylnaphthalenes such as diisopropylnaphthalene, alkylbiphenyls such as monoisopropylbiphenyl, aromatic hydrocarbons having two or more aromatic rings such as partially hydrogenated terphenyl, and chlorinated paraffins have been used as the solvents for recording material of this kind.
However, these solvents do not always satisfy the above requirements. Particularly, color developing property, odor of solvent, and bleeding and smudge in writing are usually contradictory to each other so that few solvents satisfy these requirements at the same time. Recently, as a solvent having little odor and high color developing rate, there is proposed a fraction mainly consisting of sec-butyldiphenylmethane and sec-butyldiphenylethane that is obtained by alkylating a heavier fraction produced as a by-product in ethylbenzene production, with butene (U.S. Pat. No. 4,686,548). The solvent obtained by this method is really satisfactory in color developing rate and odor; however, it is not always satisfactory in view of bleeding and smudge in writing.
DISCLOSURE OF INVENTION
The object of the present invention is to provide an excellent pressure-sensitive copying material which is free from the above-described disadvantages of the solutions used in the conventional recording materials and has particularly high color developing rate, little odor and little bleeding and smudge in writing.
The solvents for color former solution used in a pressure-sensitive copying material of the present invention is a mixture of 20 to 80 weight % of sec-butyldiphenylmethane, 5 to 50 weight % of sec-butyldiphenylethane (1,1) and 5 to 50 weight % of sec-butyldiphenylethane (1,2). The above three components make a total of 100 weight %.
The chemical structures of these compounds are as follows. ##STR1##
The substitution site of a sec-butyl group in every compound is not restricted.
The present invention will be described in more detail in the following.
The above-mentioned sec-butyldiphenylmethane, sec-butyldiphenylethane (1,1) and sec-butyldiphenylethane (1,2) can be produced easily by known methods. For example, there are known following meth
REFERENCES:
patent: 4686548 (1987-08-01), Takahashi et al.
patent: 4879269 (1989-11-01), Takahashi et al.
Narui Satoshi
Takahashi Naoya
Togami Yasuo
Nippon Petrochemicals Company Limited
Schwartz Pamela R.
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