Barrier films
AssigneeAvery Dennison Corporation
InventorsHoang T. Pham, Thomas Laney, Farid F. Ghiam, Kevin O. Henderson
Life of this patent
Estimating the term…
Abstract
Various polymeric barrier compositions are described which when formed into films, are useful in reducing transmission of odors. The films can be incorporated into a wide range of products such as multilayer barrier films used in medical applications and particularly in ostomy appliances. In certain versions, the films include semi-crystalline cyclic olefin copolymers.
Claims33
A barrier film comprising:
- a first layer and second layer, wherein the first layer and the second layer comprise a semi-crystalline cyclic olefin copolymer (COC) having a melting temperature (Tm) of from about 70° C. to about 100° C., a glass transition temperature (Tg) of from about −20° C. to about 32° C., and a norbornene content of from about 5 mole % to about 25 mole %;
- and
- a layer of ethylene vinyl alcohol (EVOH),
- wherein the EVOH layer is disposed between the first layer and the second layer, and
- wherein the weight proportion of the semi-crystalline COC is greater than 99% based upon the total weight amount of COCs in the first and second layers.
The barrier film of 16 wherein the at least one flexible support layer is disposed between the at least one layer including a semi-crystalline COC and the EVOH layer.
A barrier film comprising:
- an outer layer comprising ethylene vinyl acetate (EVA),
- a first layer and second layer, wherein the first layer and the second layer comprise a semi-crystalline cyclic olefin copolymer (COC) having a melting temperature (Tm) of from about 70° C. to about 100° C., a glass transition temperature (Tg) of from about −20° C. to about 32° C., and a norbornene content of from about 5 mole % to about 25 mole %;
- and
- a layer of ethylene vinyl alcohol (EVOH),
- wherein the EVOH layer is disposed between the first layer and the second layer.
Dependencies are inferred from the claim text.