Polyamide having improved gas barrier properties from adipic acid, isophthalic acid and m-xylylene diamine
AssigneeAmoco Corporation
InventorsJohn D. Matlack, James G. Villanueva, Bruce A. Newman, Lawrence D. Lillwitz, Melvin L. Luetkens, Jr., Gregory E. Schmidt
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Abstract
A polyamide composition comprising the following recurring units: ##STR1## in proportions such that the mole ratio of the dicarboxylic acid moieties in the A, B and C units is about 49.5-0.5/0-20/0.5-49.5 and wherein R is a divalent radical comprising ##STR2## in a mole ratio of about 0.5-50/49.5-0 and preferably having a glass transition temperature of 90.degree. C. or greater and an oxygen transmission rate of about 2.0 cc-mil/100 in.sup.2 -day-atm or less.
Claims12
A polyamide composition having improved gas barrier properties comprising the following recurring units:
- ##STR9## with or without the following recurring unit:
- ##STR10## such that the molar ratio of the dicarboxylic acid moieties in the A and C units is about 37.5-5/12.5-37.5 and in the B units is about 15 or less and wherein R is a divalent radical comprising ##STR11## provided that said D and E radicals are present in the A, B and C units in a molar ratio of about 37.5-12.5/12.5-37.5 and wherein said polyamide composition has a glass transition temperature of 90.degree. C. or greater and an oxygen transmission rate of about 2.0 cc-mil/100 in.sup.2 -day-atm or less.
Dependencies are inferred from the claim text.