公开(公告)号：US3645928A

公开(公告)日：1972-02-29

申请号：US3645928D

申请日：1969-07-16

Applicant: TORAY INDUSTRIES

Inventor： WAKAMURA NOBUO ,  TANAKA TAKASHI ,  OKADA HIROSHI ,  OSAKADA ATSUSHI

IPC: C08G69/20 ,  C08J9/04 ,  C08J1/20 ,  C08J1/26

CPC classification number: C08J9/04 ,  C08G69/20 ,  C08J2377/02

Abstract: AN IMPROVED PROCESS IS PROVIDED FOR THE PREPARATION OF POLYLACTAM FOAMS IN WHICH E-CAPROLACTAM OR A MIXTURE OF LACTAMS CONTAINING MORE THAN 50 MOL PERCENT OF E-CAPROLACTAM IS ANIONICALLY POLYMERIZED IN THE PRESENCE OF AN ALKALI CATALYST, A BLOWING AGEN AND A PROMOTER AT A TEMPERATURE OF ABOUT 100-180*C. THE IMPROVED PROCESS IS PARTICULARLY CHARACTERIZED BY THE USE OF A PROMOTER WHICH WHEN ADDED TO A MIXTURE OF LACTAM AND ALKALI CATALYSTS CAUSES THE MIXTURE TO SOLIDIFY DUE TO CRYSTALLIZATION WITHIN 3 MINUTES AND TO PRODUCE A POLYLACTAM HAVING A RELATIVE VISCOSITY OF AT LEAST 3 WHEN A CONVERSION REACHES EQUILIBRIUM. THE POLYLACTAM FOAMS OF THIS INVENTION EXHIBIT IMPROVED MECHANICAL AND CHEMICAL PROPERTIES IN COMPARISON WITH THE POLYLACTAM FOAMS OF THE PRIOR ART WHICH MAKE THEM ESPECIALLY USEFUL FOR THE MANUFACTURE OF LOW DENSITY ARTICLES REQUIRING RELATIVELY HIGH STRENGTH AND CHEMICAL RESISTANCE.

公开(公告)号：CA860998A

公开(公告)日：1971-01-12

申请号：CA860998D

Applicant: TORAY INDUSTRIES

Inventor： OKADA HIROSHI ,  TANAKA TAKASHI ,  OSAKADA ATSUSHI ,  WAKAMURA NOBUO