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AssigneeE. I. Du Pont de Nemours and Company
InventorStewart Carl Feinberg
Estimating the term…
An ionomer/polyamide blend with improved flow (e.g., lower viscosity) can be achieved while simultaneously maintaining or improving physical properties such as low temperature Izod impact resistance by the addition of low molecular weight ethylene/acrylic acid copolymer (e.g., so-called acid wax polymer derived from copolymerizing at least 5 weight percent and preferably greater than 9 weight percent acrylic acid and/or methacrylic acid with ethylene and having a melt index, ASTM D1238, preferably greater than 900 dg/min and most preferably greater than 5,000 dg/min). Optionally, the blends can further contain additives such as very low density polyethylene (VLDPE), ethylene propylene elastomer (EPR), ethylene propylene diene monomer elastomer (EPDM), corresponding maleic anhydride grafted elastomers (MAN-g-VLDPE; MAN-g-EPR; and MAN-g-EPDM), or mixtures thereof. The blends exhibiting improved flow characteristics according to the instant invention are particularly useful in the manufacture of automotive parts, panels and the like having a “class A” surface.
An ionomer/polyamide blend having improved flow properties comprising for every one hundred parts by weight of ionomer/polyamide blend:
A method of reducing the viscosity of an ionomer/polyamide blend without significantly degrading low temperature impact resistance comprising the steps of blending for every one hundred parts by weight of ionomer/polyamide blend
A metallic pigmented ionomer/polyamide blend having improved impact properties comprising for every one hundred parts by weight of ionomer/polyamide blend:
A method of restoring impact resistance of a metallic pigmented ionomer/polyamide blend comprising the step of blending for every one hundred parts by weight of a metallic pigmented ionomer/polyamide blend up to twenty parts per weight of one or more additives selected from the group consisting of very low density polyethylene (VLDPE), maleic anhydride grafted VLDPE, ethylene propylene (EPR) rubber, maleic anhydride grafted EPR, ethylene propylene diene monomer rubber (EPDM), maleic anhydride grafted EPDM, and mixtures thereof.
Dependencies are inferred from the claim text.