Patent ID: 6472470
Filing Date: 2002-10-29
Classification: C08F

Abstract:
A vinyl alcohol polymer havingan ethylene unit content of 2 to 19 mole %; a polymerization degree of 200 to 2,000; a degree of saponification of 80 to 99.99 mole %; a total content of carboxyl group and lactone rings of 0.02 to 0.4 mole %; a 1,2-glycol bond content of 1.2 to 2 mole %; a molar fraction, based on vinyl alcohol units, of a hydroxyl group of vinyl alcohol unit located at the center of 3 successive vinyl alcohol unit chain in terms of triad expression of 65 to 98 mole %; and a melting point of 160 to 230Â° C.