Patent US9056967

Water-sensitive biodegradable film
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US9056967

1. A release liner comprising water-sensitive biodegradable film and a release agent coated onto a surface thereof, the water-sensitive biodegradable film comprising: (8) (2)

from 1 wt. % to 20 wt. % of at least one biodegradable aliphatic-aromatic copolyester that has a melting point of from about 50° C. to about 180° C. and a glass transition temperature of about 0° C. or less; and

from 80 wt. % to 99 wt. % of at least one water-sensitive thermoplastic starch component, wherein the thermoplastic starch component comprises from about 60 wt. % to about 80 wt. % of at least one water-soluble, chemically modified starch, from about 0.5 wt. % to about 4 wt. % of at least one surfactant, and from about 20 wt. % to about 40 wt. % of at least plasticizer, wherein the water-soluble chemically modified starch comprises a starch ester, a hydroxyalkyl starch, or a combination thereof; wherein the film has a thickness of about 50 micrometers less and exhibits visible disintegration when sloshed in tap water for 30 seconds at a frequency of 3.5 sloshes per second, the film further exhibiting a dry ultimate tensile strength of from about 20 to about 50 Megapascals in the machine direction and a dry modulus of elasticity of from about 400 to about 1000 Megapascals in the machine direction.

2. The release liner of claim 1, wherein the biodegradable aliphatic-aromatic copolyester has a melting point of about 80° C. to about 160° C. (0)

3. The release liner of claim 1, wherein the hydroxyalkyl starch is hydtoxyethyl starch, hydroxypropyl starch, hydroxybutyl starch of a combination thereof. (0)

4. The release liner of claim 1, wherein the plasticizer is a polyhydric alcohol. (2) (0)

6. The release liner of claim 1, wherein the surfactant is a nonionic surfactant having an HLB value of from about 1 to about 10. (1) (0)

7. The release liner claim 1, wherein the film has a thickness of from about 5 to about 30 micrometers. (0)

8. The release liner of claim 1, wherein the biodegradable aliphatic-aromatic copelyester has a number average molecular weight of from about 40,000 to about 120,000 gram per mole. (0)

9. The release liner of claim 1, wherein the biodegradable aliphatic-aromatic copolyester has a glass transition temperature of about −10° C. or less. (0)

11. The release liner of claim 1, wherein the film exhibits a dry ultimate tensile strength of from about 5 Megapascals to about 30 Megapascals in the cross-machine direction and a dry modulus of elasticity of from about 150 Magepascals to about 500 Megapascals in the cross-machine direction. (0)

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Patent US9056967

Water-sensitive biodegradable film

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