| 摘要 |
<p>Novel copolyamides having the recurring unit <IMAGE> are disclosed wherein, in about 30 percent to about 60 percent of the recurring units, R is -CH2)x wherein x is an integer from 7 to 12 inclusive, and, in about 40 percent to about 70 percent of the recurring units, R is m-phenylene; Ar in about 70 percent to about 95 percent of the recurring units is 4,4'-methylenebis(phenylene) and in the remaining 5 to 30 percent is a tolylene radical; and provided that when at least about 50 percent of R is m-phenylene Ar is at least 10 percent tolylene and further provided that said tolylene radicals are present in said copolyamide substantially as polyamide blocks with at least said m-phenylene radicals.</p> |
