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US 8,029,892 B2Granted
Breathable film
AssigneeAtofina
InventorChristophe Lacroix
Life of this patent
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Abstract
A breathable film includes at least one polymer (a) taken from the group comprising an ethylene/alkyl (meth)acrylate copolymer (a1), an optionally neutralized ethylene/ (meth)acrylic acid copolymer (a2), an ethylene/vinyl monomer copolymer (a3), the (a1)/(a2) blend, the (a1)/(a3) blend, the (a2)/(a3) blend and the (a1)/(a2)/(a3) blend, and/or includes at least one functionalized polyethylene (b); and at least one copolymer (c) having copolyamide blocks or polyester blocks and polyether blocks.
Claims13
A breathable film comprising a blend of:
- from 45%-75% of at least one polymer (a) taken from the group comprising an ethylene/alkyl(meth)acrylate copolymer (a1), an optionally neutralized ethylene/alkyl(meth)acrylic acid copolymer (a2), an ethylene/vinyl monomer copolymer (a3), the (a1)/(a2) blend, the (a1)/(a3) blend, the (a2)/(a3) blend and the (a1)/(a2)/(a3) blend;
- from 3% to 15% of at least one functionalized polyethylene (b) wherein a and b are not of the same and are not both an ethylene /alkyl/(meth)acrylate copolymer;
- and
- from 25% to 45% of at least one copolymer (c) having a melting point of between 80 and 150° C. and comprising copolyamide blocks and polyether blocks;
- said film having a water vapor permeability of about 625 to about 910 g/m2/24 h for a thickness of 50 μm, per ASTM E 96.
2 more elements
Dependencies are inferred from the claim text.