Process for the production of hollow articles of polymerized lactams

Claim 1

A PROCESS FOR THE PRODUCTION OF HOLLOW ARTICLES OF POLYMERIZED LACTAMS, WHICH COMPRISES COMPRISES PRODUCING IN A HOT MOLD CAVITY A LIQUID POLYMERIZABLE CHARGE HAVING A TEMPERATURE AT LEAST 40*C. LOWER THAN THE TEMPERATURE OF THE MOLD, WHICH CHARGE CONTAINS (1) A METAL LACTAM CATALYST, IN WHICH THE LACTAM HAS THE FORMULA: O=C<(-CH2-(CH2)N-NH-) WHEREIN N IS AN INTEGER FROM 2 TO 12 AND THE METAL IS FROM THE GROUP CONSISTING OF ALKALI METALS AND ALKALINE EARTH METALS; (2) A SYMMETRICAL TRIAZINE HAVING A REPLACEABLE SUBSTITUENT ON AT LEAST ONE OF THE RING CARBON ATOMS OF THE TRIAZINE; AND (3) A LACTAM HAVING THE SAID FORMULA; MAINTAINING ANHYDROUS CONDITIONS IN THE MOLD CAVITY, ROTATING THE MOLD ABOUT A PAIR OF AXES ANGULARLY DISPOSED WITH RESPECT TO EACH OTHER AT ANGULAR VELOCITIES AT WHICH THE RESULTING CENTRIFUGAL FORCES ARE BELOW THE FORCE OF GRAVITY, WHILE HEATING THE MOLD CAVITY TO A TEMPERATURE WITHIN THE RANGE OF 130*C. TO 215*C., TO REPEATEDLY WASH THE WALLS OF THE MOLD CAVITY WITH SAID POLYMERIZATION CHARGE TO BUILD UP SUCCESSIVE LAYERS OF THE LACTAM POLYMER ON THE SAID WALLS AND PRODUCE A CAST ARTICLE OF POLYLACTAM POLYMER CONFORMING TO THE SHAPE OF THE WALLS OF THE MOLD CAVITY; AND REMOVING SAID ARTICLE FROM THE MOLD.