公开(公告)号：US3640945A

公开(公告)日：1972-02-08

申请号：US3640945D

申请日：1968-10-01

Applicant: BASF AG

Inventor： RICKER ERNST ,  SCHMIDT FRANZ ,  SCHWARTZ ERICH

IPC: C08G2/00 ,  C08G2/18 ,  C08G2/30 ,  C08G2/36 ,  C08G1/22

CPC classification number: C08G2/36 ,  C08G2/18 ,  C08G2/22 ,  C08G2/30 ,  C08G4/00

Abstract: A PROCESS FOR IMPROVING THE THERMAL STABILITY OF COPOLYMERS OF TRIOXANE WHICH CONTAIN AT LEAST 80% BY WEIGHT OF -O-CH2- GROUPS AND ISTRIBUTED IN THE POLYMER CHAIN IN AMOUNTS OF LESS THAN 20% BY WEIGHT (WITH REFERENCE TO THE COPOLYMER) OF (-)3C-C(-)3 GROUPINGS BY ELIMINATING UNSTABLE PORTIONS OF THE CHAIN BY HEATING WITH AQUEOUS SOLUTIONS OF ALKALI METAL OR ALKALINE EARTH METAL FLUORIDES.

公开(公告)号：US3547836A

公开(公告)日：1970-12-15

申请号：US3547836D

申请日：1961-09-25

Applicant: BASF AG

Inventor： BRUEGGEMANN HORST ,  DACHS KARL ,  SCHWARTZ ERICH ,  WILHELM HANS

IPC: C08J9/04 ,  C08F47/10 ,  C08J1/26

CPC classification number: C08J9/04 ,  C08J2377/02 ,  Y10S264/56