Coextrusion binder based on cografted metallocene polyethylene
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United States of America Patent
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Mar 4, 2003
Grant Date -
Dec 20, 2001
app pub date -
Mar 26, 2001
filing date -
Mar 24, 2000
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Abstract
The present invention relates to a coextrusion binder comprising: 5 to 35 parts of a polymer (A) which itself consists of a blend of 80 to 20 parts of a metallocene polyethylene (A1) of relative density between 0.865 and 0.915 and of 20 to 80 parts of a non-metallocene LLDPE polyethylene (A2), the blend of (A1) and (A2) being cografted by an unsaturated carboxylic acid; 95 to 65 parts of a polyethylene (B) chosen from ethylene homopolymers or copolymers and elastomers; the blend of (A) and (B) being such that: the content of grafted unsaturated carboxylic acid is between 30 and 100 000 ppm, the MFI or melt flow index (ASTM D 1238 standard: 190.degree. C./2.16 kg) is between 0.1 and 10 g/10 min. The present invention also relates to a multilayer structure.
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