Claims
- 1. An oriented film comprising i) an aliphatic polyamide and ii) a block copolyetherester elastomer.
- 2. The film of claim 1, wherein the aliphatic polyamide is selected from polyamide 6, polyamide 6.66, blends and mixtures thereof.
- 3. The film of claim 1, wherein the aliphatic polyamide has a viscosity ranging from about 140 to about 270 cm3/g measured according to ISO307 at 0.5% in 96% H2SO4.
- 4. The film of claim 1, wherein the aliphatic polyamide is present in an amount from about 50 weight % to about 99.9 weight %, relative to the weight of the film.
- 5. The film of claim 1, wherein the elastomer is a copolyetherester having a multiplicity of recurring long-chain ester units and short-chain ester units joined head-to-tail through ester linkages, said long-chain ester units being represented by the formula:
- 6. The film of claim 5, wherein the copolyetherester elastomer contains 45 weight percent 1,4-butylene terephthalate, and 55 weight percent ethylene oxide/propylene oxide copolyether terephthalate, for which the copoly(alkylene oxide) glycol used is obtained by endcapping poly(propylene ether) glycol with 64 weight percent ethylene oxide, and has a molecular weight of about 2100.
- 7. The film of claim 1, wherein the copolyetherester elastomer is present in an amount from about 0.1 weight % to about 50% , relative to the weight of the film.
- 8. The film of claim 1, wherein the film is biaxially oriented.
- 9. The film of claim 1, wherein the film has a moisture vapor transmission rate measured according to ASTM E398 at a temperature of 38° C. and a relative humidity of 85% greater than or equal to 100 g/m2×24 h.
- 10. The film of claim 9, wherein the film has a moisture vapor transmission rate measured according to ASTM E398, at a temperature of 38° C. and a relative humidity of 85% greater than or equal to 200 g/m2×24 h.
- 11. The film of claim 1, wherein the film has a moisture vapor transmission rate measured according to ASTM F1249 at a temperature of 37.8° C. and a relative humidity of 100%, calculated for a film of 25 microns, greater than or equal to 750 g/m2×24 h.
- 12. Tubular casing comprising a film according to claim 1.
- 13. Process of manufacturing an oriented film comprising the steps of:
a) providing a composition comprising i) an aliphatic polyamide and ii) a block copolyetherester elastomer, b) extruding an extrudate of composition of step a), and c) quenching and orienting the extrudate of step b) in at least one direction.
- 14. Process of manufacturing a tubular film comprising the steps of:
a) providing a composition comprising i) an aliphatic polyamide and ii) a block copolyetherester elastomer, and b) processing the composition of step a) through double bubble extrusion to obtain an oriented blown film.
Parent Case Info
[0001] This application claims the benefit of U.S. Provisional Application No. 60/282,890, filed Apr. 11, 2001, which is incorporated herein by reference for all purposes.
Provisional Applications (1)
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Number |
Date |
Country |
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60282890 |
Apr 2001 |
US |