Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1993-03-31
1994-03-15
Schofer, Joseph L.
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
526326, B32B 2308
Patent
active
052944840
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to video printing paper, and more particularly to video printing paper having a receiving layer consisting essentially of polyvinyl aromatic carboxylic acid ester or copolymer of it.
BACKGROUND ART
Conventionally, attempts to form an image on video printing paper have been made in the following manner. That is, an image composed of a dyestuff transferred onto a surface of resin-coated paper by heating an ink ribbon having a dyestuff layer containing a sublimating-type disperse dye with a thermal head in a dot pattern in accordance with video signals is formed. The Video printing paper has a two-layer structure of a receiving layer and a sheet-like base material. The receiving layer is a layer for receiving the image composed of the dyestuff transferred from the ink ribbon, for example, a sublimating-type disperse dye, and maintaining the image formed by receiving the dyestuff. Up to now, polyester copolymer, polycarbonate copolymer, and polyvinyl chloride copolymer have been used as materials composing the receiving layer.
However, the image formed on the conventional video printing paper with the receiving layer composed of the above-mentioned resin has been insufficient in dyeing property, light resistance, and weather resistance. Therefore, occasionally visibility of the formed image declined, or the color of the image changed. This is believed to be due to susceptibility of the dyestuff to light, moisture, and oxygen in the air, because of the presence of the dyestuff transferred by the thermal head in the vicinity of the surface of the receiving layer.
DISCLOSURE OF THE INVENTION
Thus, it is an object of the present invention to provide polyvinyl aromatic carboxylic acid ester having an unprecedentedly high average polymerization degree, and simultaneously having excellent film formation performance, adhesion, flexibility and glossiness. It is another object of the present invention to provide video printing paper of polyvinyl aromatic carboxylic acid ester whereby an image formed by transfer of a dyestuff exhibits high light resistance and weather resistance.
In order to achieve the above-mentioned objects, the present inventors have continued research on catalysts for polymerizing aromatic carboxylic acid vinyl ester, and have thoroughly examined a wide range of compounds developed as radical polymerization catalysts. As a result, the present inventors have found out that a polymer exhibiting a significantly high polymerization degree and excellent film formation performance can be obtained only when a particular catalyst, that is, 1,1'-azobis (cyclohexane-1-carbonitrile) or 4,4'-azobis (4-cyanovaleric acid), is used.
The present invention is completed on the basis of such knowledge. Namely, according to the first aspect of the present invention, there is provided homopolymer of aromatic carboxylic acid vinyl ester exhibiting an average polymerization degree of 400 or above.
According to the second aspect of the present invention, there is provided 1,1'-azobis (cyclohexane-1-carbonitrile) or 4,4'-azobis (4-cyano-valeric acid) as a catalyst for polymerizing aromatic carboxylic acid vinyl ester so as to synthesize polyvinyl aromatic carboxylic acid ester.
The polyvinyl aromatic carboxylic acid ester of the present invention is homopolymer of aromatic carboxylic acid vinyl ester, exhibiting an average polymerization degree of 400 or above. The polyvinyl aromatic carboxylic acid ester with such a high polymerization degree has never been synthesized, and is provided for the first time by the present invention.
With the average polymerization degree of 400 or above, the polyvinyl aromatic carboxylic acid ester of the present invention exhibits excellent performance as a polymeric material. The polyvinyl aromatic carboxylic acid ester is superior in adhesion, flexibility, and glossiness, which are characteristics of polycarboxylic acid vinyl ester, and also exhibits film formation performance sufficient for practical use. Accordingly, the polyvinyl arom
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Hida Masanobu
Kobayashi Rikio
Sarofim N.
Schofer Joseph L.
Sony Corporation
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