Claims
- 1. A polymeric composition suitable for fabrication into a radio frequency weldable film structure, the composition consisting essentially of a blend of a copolyamide and an RF inactive polyolefin that has a carboxylic acid functionality and an acid comonomer content of at least three weight percent, based on total polyolefin weight, the blend having a dielectric loss factor of at least 0.05 at a frequency of 27 megahertz at 23° centigrade, the copolyamide being present in an amount within a range of from 35 to less than 60 percent by weight, based on total blend weight; wherein the RF inactive polyolefin with carboxylic acid functionality has a melt index of 0.5 to 300 grams per 10 minutes (190° C., 2.16 Kg) according to ASTM D-1238.
- 2. The composition of claim 1, wherein the copolyamide is derived from a dimeric fatty acid.
- 3. The composition of claim 1, wherein the polyolefin is an ethylene/acrilic acid copolymer or an ethylene/methacrylic acid copolymer.
- 4. The composition of claim 1, wherein the polyolefin is a base polyolefin having grafted thereto at least one monomer selected from the group consisting of ethylenically unsaturated carboxylic acids.
- 5. The composition of claim 4, wherein the base polyolefin is selected from the group consisting of linear low density polyethylene, low density polyethylene, ultra low density polyethylene, copolymers of ethylene and at least one alpha-olefin monomer, linear ethylene/alpha-olefin copolymers, substantially linear ethylene/alpha-olefin copolymers, propylene polymers and copolymers and copolymers of ethylene and less than 30 weight percent, based on copolymer weight, of a polar monomer.
- 6. The composition of claim 5, wherein the polar monomer is selected from the group consisting of vinyl acetate, methyl acrylate, acrylic acid and methacrylic acid.
- 7. The composition of claim 5, wherein the alpha-olefin monomer contains from 3 to 20 carbon atoms.
- 8. The composition of claim 5, wherein the polyolefin is an ethylene/alpha-olefin copolymer having a density within a range of from 0.86 to 0.94 grams per cubic centimeter.
CROSS-REFERENCE STATEMENT
This Application claims benefit of U.S. Provisional Application No. 60/203,715, filed May 12, 2000.
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Provisional Applications (1)
|
Number |
Date |
Country |
|
60/203715 |
May 2000 |
US |