Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
1998-10-13
2001-02-27
Wu, David (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S584000, C524S586000, C428S119000, C428S308400
Reexamination Certificate
active
06194506
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a resin film excellent in offset printing properties, especially ink dryability. The term “resin film” as used herein is meant to indicate either a stretched or unstretched resin film.
BACKGROUND OF THE INVENTION
It is known to stretch a resin film comprising a polyolefin as a non-polar resin such as polypropylene and polyethylene having a heavy calcium carbonate powder or light calcium carbonate powder incorporated therein so that it is provided with offset printing properties as disclosed in JP-B-1-56091 (The term “JP-B” as used herein means an “examined Japanese patent publication”) and JP-A-7-232397 (The term “JP-A” as used herein means an “unexamined published Japanese patent application”).
The foregoing stretched resin film has excellent offset printing properties. However, with the recent development of high speed offset printers, it has been desired to provide a printing resin film which allows an ink to dry rapidly.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a printing resin film excellent in ink dryability and transferability.
The foregoing object of the present invention will become more apparent from the following detailed description and examples.
The inventors made extensive studies of printing resin film. As a result, it was found that a resin film comprising a polyolefin and a calcium carbonate powder having a specific oil absorption is excellent in ink dryability and transferability. Thus, the present invention has been accomplished.
The present invention provides a resin film comprising a resin composition comprising (A) from 25 to 65% by weight of a calcium carbonate powder having an oil absorption of from 70 to 200 ml/100 g as determined by JIS-K5101-1991 and (B) from 35 to 75% by weight of a thermoplastic resin.
REFERENCES:
patent: 5236885 (1993-08-01), Tanimoto
patent: 5489471 (1996-02-01), Inoue et al.
patent: 5629072 (1997-05-01), Yamanaka et al.
patent: 07232397 (1995-09-01), None
Patent Abstracts of Japan, vol. 13, No. 286 (C-613), Jun. 29, 1989, JP 01 081829, Mar. 28, 1989.
Patent Abstracts of Japan, vol. 96, No. 1, Jan. 31, 1996, JP 07 232397, Sep. 5, 1995.
Hirabe Toshiyuki
Ochiai Hisao
Shibuya Nobuhiro
Egwim Kelechi C.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Oji-Yuka Synthetic Paper Co., Ltd.
Wu David
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