Flexible barrier films containing cyclic olefins
AssigneeAvery Dennison Corporation
InventorsHoang T. Pham, Farid F. Ghiam, Thomas Laney
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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 blends of amorphous cyclic olefin copolymers and semi-crystalline cyclic olefin copolymers.
Claims51
A multilayer barrier film comprising:
- at least one layer including a blend of cyclic olefin copolymers (COC), wherein the blend includes a semi-crystalline COC and a norbornene COC, wherein a total norbornene concentration of the norbornene COC in the at least one layer is from about 12% to about 60% by mole based upon the total moles of COCs in the layer;
- and
- a secondary barrier layer including ethylene vinyl alcohol (EVOH);
- wherein the semi-crystalline cyclic olefin copolymer has a glass transition temperature of from about −20° C. to about 20° C.
A multilayer barrier film comprising:
- at least one layer including a blend of cyclic olefin copolymers (COC), wherein the blend inclues a semi-crystalline COC and a norbornene COC, wherein a total norbornene concentration of the norbornene COC in the at least one layer is from about 12% to about 60% by mole based upon the total moles of COCs in the layer;
- and
- a secondary barrier layer including ethylene vinyl alcohol (EVOH);
- and
- at least one flexible support layer including one or more polymers selected from the group consisting of styrenic elastomers, polyolefins, and polyolefin elastomers and combinations thereof;
- wherein the one or more polymers has a density of from about 0.75 to about 1.10 g/cm3.
A multilayer barrier film comprising:
- at least one layer including semi-crystalline cyclic olefin copolymer (COC) having a melting temperature (Tm) of from about 70° C. to about 120° C., a glass transition temperature (Tg) of from about −20° C. to about 20° C. and a norbornene COC, wherein a norbornene content of the norbornene COC in the at least one layer is from about 12% to about 60% by mole based upon the total moles of COCs in the layer.
A method for reducing transmission of odorous species, the method comprising:
- providing at least one layer including a blend of cyclic olefin copolymers (COC), wherein the blend includes a semi-crystalline COC and a norbornene COC, wherein a total norbornene concentration of the norbornene COC in the at least one layer is from about 12% to about 60% by mole based upon the total moles of COCs in the layer;
- forming a barrier film including the at least one layer including a blend of cyclic olefin copolymers (COC);
- and
- positioning the barrier film between a source of odorous species and a user;
- wherein the semi-crystalline cyclic olefin copolymer has a glass transition temperature of from about −20° C. to about 20° C.
A multilayer barrier film defining a central layer through which extends a central plane, the central layer defining a first face and an oppositely directed second face, the barrier film comprising:
- a first layer including at least one semi-crystalline COC having a glass transition temperature of −20° C. to 20° C., the first layer disposed immediately adjacent to the first face of the central layer;
- a second layer including at least one semi-crystalline COC, the second layer disposed immediately adjacent to the second face of the central layer.
Dependencies are inferred from the claim text.