| abstract |
Vinyl alcohol polymers having an ethylene unit contentnof 2 to 19 mole %, a polymerization degree of 200 to 2,000,na degree of saponification of 80 to 99.99 mole % and a totalncontent of carboxyl group and lactone rings of 0.02 to 0.4nmole % are excellent in thermal stability, water resistance,ngas-barrier properties, water vapor-barrier property,nstability of aqueous solution kept at low temperatures andnbiodegradability. |