PURPOSE: To obtain the title sheet with transparency, which is excellent over wide temperature range, by a structure wherein specified terpolymer is pinched between transparent sheets.
CONSTITUTION: In ethylene-vinyl acetate-vinyl alcohol terpolymer, which is obtained by partially saponifying ethylene-vinyl acetate copolymer uniformly, the copolymer is specified by the content of unit derived from vinyl acetate of 46 - 53wt%, MFI (melt flow index measured at 190°C) of 1 - 20g/10min, polydispersing value Mw/Mn (in which, Mw is weight average molecular weight and Mn is number average molecular weight) of 4.0 or less, the ratio of ethylene chain in triad, which is measured by the nuclear magnetic resonance of isotope 13C, of 50mol% or less in comonomer distribution. Further, the terpolymer is specified by the content of unit derived from vinyl alcohol of 12.4 - 15.2wt.% and crystalline melting enthalpy of 0.5cal/g or less or being substantially amorphous. The sheet concerned is produced by pinching the above-mentioned terpolymer between transparent sheets, each consisting of glass sheet and/or synthetic resin sheet.
IWASHITA TOSHIYUKI
NAGAOKA KOJI
SAITO SHIGEKI
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