Stock material or miscellaneous articles – Structurally defined web or sheet – Physical dimension specified
Patent
1991-09-11
1993-07-06
Sluby, P. C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Physical dimension specified
428339, 428413, 428330, 528 87, 4274072, 427386, B32B 2738, C08G 5902
Patent
active
052252680
ABSTRACT:
An epoxy resin film which is so strong as to have a tensile strength of not less than 10 MPa and an elongation of not less than 5% is formed by using a substantially linear high molecular weight epoxy resin which is synthesized by polymerizing a difunctional epoxy resin having two epoxy groups per molecule and a dihydric phenol in an aprotic polar solvent, in the presence of a solvent, at a reaction temperature ranging from 80.degree. to 130.degree. C., the difunctional epoxy resin and the dihydric phenol being used in quantities which provide a ratio of phenolic hydroxyl groups to epoxy groups of from 1:0.9 to 1:1.1 and a proportion of the total of them of at most 50% by weight based on the total of them and the aprotic polar solvent.
REFERENCES:
patent: 3306872 (1967-02-01), Maycock et al.
patent: 4778863 (1988-10-01), Wang et al.
patent: 4900801 (1990-02-01), Takata et al.
patent: 4921927 (1990-05-01), Heffner, Jr. et al.
Arai Masami
Hoshi Ikuo
Kobayashi Kazuhito
Shibata Katsuji
Takano Nozomu
Hitachi Chemical Company Ltd.
Sluby P. C.
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