Transparent copolyamide from caprolactam, cyclic diamine and cyclic dicarboxylic acid

A transparent, alcohol resistant, hot water resistant, thermoplastically formable copolymer of

• (A) 80.4 to 88.8 weight percent epsilon-caprolactam and the remaining
• (B) 11.2 to 19.6 weight percent of substantially equimolar portions of a moiety derived from a (1) diamine or diisocyanate selected from the group consisting of ##STR4## and mixtures thereof, and a diacid selected from the group consisting of ##STR5## and mixtures thereof, wherein R.sub.1 is independently selected from the group consisting of --H, --CH.sub.3, CH.sub.2 CH.sub.3, ##STR6## and --CH.sub.2 CH.sub.2 CH.sub.3, R.sub.2 is independently selected from the group consisting of --H, --CH.sub.3 and --CH.sub.2 CH.sub.3, R.sub.3 is independently selected from the group consisting of --CH.sub.2 -- and --CH.sub.2 CH.sub.2 --, and R.sub.4 is independently selected from the group consisting of --CH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 CH.sub.2 -- and ##STR7## or (C) 11.2 to 19.6 weight percent of ##STR8## wherein said copolymer is thermoformable at a temperature greater than the glass transition temperature of the copolymer and withstands exposure to an alcohol for extended periods without becoming translucent, dissolving or flowing.