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US 6,472,470 B1Granted
Vinyl alcohol polymer and its composition
AssigneeKuraray Co., Ltd.
InventorsNaoki Fujiwara, Kazuyuki Somemiya, Takeshi Kusudou
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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.
Claims16
A vinyl alcohol polymer 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 %;
- 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 230° C.
5 more elements
Dependencies are inferred from the claim text.