Saponified ethylene-vinyl acetate copolymer and laminate
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United States of America Patent
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Aug 13, 2002
Grant Date -
N/A
app pub date -
Jan 18, 2000
filing date -
Jan 19, 1999
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Abstract
A saponified ethylene-vinyl acetate copolymer is characterized in that, in the relationship between the heating time and the extrusion rate as measured with a Koka flow tester at at least one temperature higher by 10-80.degree. C. than the melting point thereof, it shows an extrusion rate at any time within the period of 15 minutes to 2 hours of heating which is 0.1-50 times the extrusion rate at 15 minutes of heating and an extrusion rate at any time within the period of 2-10 hours of heating which is less than 2 times the extrusion rate at 15 minutes of heating and that, in the relationship between the heating time and the torque at at least one temperature higher by 30-60.degree. C. than the melting point, it shows, at any time within the range of 1-2 hours of heating, a toruque value within the range of 1/6 to 5/6 of the maximum torque value found within the initial 20 minutes of heating.
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