| abstract |
Vinyl alcohol polymers having an 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% and a total content of carboxyl group and lactone rings of 0.02 to 0.4 mole% are excellent in thermal stability, water resistance, gas-barrier properties, water vapor-barrier property, stability of aqueous solution kept at low temperatures and biodegradability. |