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US 9,150,699 B2Granted
Film formed from a blend of biodegradable aliphatic-aromatic copolyesters
AssigneeKimberly-Clark Worldwide, Inc.
InventorsBo Shi, James H. Wang
Life of this patent
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Abstract
A film that is formed from a biodegradable polymer blend of different aliphatic-aromatic copolyesters is provided. More specifically, the blend contains a first copolyester formed from a terephthalic acid monomer. The use of a terephthalic acid monomer results in a polymer chain containing 1,4-(para-)terephthalate units linked in a generally linear configuration (e.g., ˜180°). The blend also contains a second aliphatic-aromatic copolyester formed from a phthalic acid and/or isophthalic acid monomer.
Claims13
A laminate comprising:
- a nonwoven web material;
- and
- a film joined to the nonwoven web material, wherein the film comprises a biodegradable polymer blend, the biodegradable polymer blend containing from about 15 wt. % to about 85 wt. % of a first aliphatic-aromatic copolyester and from about 15 wt. % to about 85 wt. % of a second aliphatic-aromatic copolyester, wherein the first aliphatic-aromatic copolyester is formed from a first aromatic monomer that includes terephthalic acid or a derivative thereof and the second aliphatic-aromatic copolyester is formed from a second aromatic monomer that includes phthalic acid or a derivative thereof, isophthalic acid or a derivative thereof, or a combination of the foregoing, wherein the glass transition temperature of the first aliphatic-aromatic copolyester and the second aliphatic-aromatic copolyester is about 0° C or less, and wherein the film exhibits a water vapor transition rate of from about 800 to about 10,000 grams/m2-24 hours.
Dependencies are inferred from the claim text.