公开(公告)号：US3759888A

公开(公告)日：1973-09-18

申请号：US3759888D

申请日：1970-11-10

Applicant: OSAKA SODA CO LTD

Inventor： NOSE S ,  TSUJIMURA H ,  YOSHIMOTO H ,  IIO K ,  ISHIHARA H

IPC: C08F8/20 ,  C08L23/28 ,  C08L27/06 ,  C08L27/24 ,  C08F29/04

CPC classification number: C08L23/286 ,  C08F8/20 ,  C08L27/06 ,  C08L27/24 ,  C08L23/28 ,  C08L21/00 ,  C08L57/00 ,  C08L2666/04 ,  C08F10/00

Abstract: AN IMPROVED PROCESS OF MAKING CHLORINATED POLYETHYLENES, WHICH COMPRISES THE STEPS OF: (A) FIRST STAGE CHLORINATION OR POLYETHYLENE POWDER, UNDER INTRODUCTION OF CHLORINE, AT A TEMPERATURE NOT EXCEEDING THE UPPER CRITICAL MELTING TEMPERATURE (T) OR THE FLUCTUATED UPPER CRITICAL MELTING TEMPERATURE (TA) OF CRYSTALLINE PORTION OF THE POLYETHYLENE, (B) HEAT-TREATMENT OF THE FIRST-STAGE-CHLORINATED POLYETHYLENE AT A TEMPERATURE (TB) EXCEEDING THE LOWER CRITICAL MELTING TEMPERATURES OF CRYSTALLINE PORTION OF SAID CHLORINATED POLYETHYLENE AND THE TEMPERATURE AT WHICH THE FIRST STAGE CHLORINATION IS PERFORMED, FOLLOWING THE INTERRUPTION OF CHLORINE INTRODUCTION, AND (C) FURTHER CHLORINATION OF THE HEAT-TREATED, CHLORINATED POLYETHYLENE UNTIL THE DESIRED CHLORINE CONTENT IS OBTAINED, UNDER RESUMPTION OF CHLORINE INTRODUCTION AT A TEMPERATURE (TC) BELOW THE ABOVE TEMPERATURE (TB).