Novel olefin polymer compositions and foamed articles prepared therefrom having improved elevated temperature dimensional stability
AssigneeThe Dow Chemical Company
InventorChung P. Park
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Abstract
Elevated temperature distortion characteristics of freshly prepared olefin polymer foams are substantially improved by employing in the preparation thereof a small amount (e.g., from about 0.15 to about 10 weight percent based on the olefin polymer) of certain selected N-substituted fatty acid amide compounds of the formula: ##STR1## wherein R.sub.1 represents an alkyl group of from 11 to 17 carbon atoms and R.sub.2 represents an alkyl group of from 12 to 18 carbon atoms.
Claims9
An olefin polymer composition consisting essentially of an olefin polymer and from about 0.15 to about 10 weight percent based upon the weight of said olefin polymer of an N-substituted fatty acid amide of the Formula:
- ##STR4## wherein R.sub.1 represents an alkyl group of from about 11 to about 17 carbon atoms and R.sub.2 represents an alkyl group of from about 12 to about 18 carbon atoms, said N-substituted fatty acid amide being selected from the group consisting of N-lauryl lauric acid amide, N-lauryl myristamide, N-myristyl myristamide, N-palmityl myristamide, N-lauryl palmitamide, N-myristyl palmitamide, N-palmityl palmitamide, N-palmityl stearamide and N-stearyl stearamide;
- said N-substituted fatty acid amide being employed in an amount such that if said olefin polymer composition is foamed by extrusion using a volatile organic blowing agent, the presence of said fatty acid amide prevents the freshly prepared foam from shrinking by more than 10% from its initially foamed volume when subjected to prolonged exposure to atmospheric pressure air at 150.degree. F.
Dependencies are inferred from the claim text.