公开(公告)号：US5006608A

公开(公告)日：1991-04-09

申请号：US241620

申请日：1988-09-08

申请人： John B. Gardiner ,  Anthony A. Loffredo ,  ricardo Bloch ,  Nicholas C. Nahas ,  Keith U. Ingold ,  Theodore V. Kowalchyn

发明人： John B. Gardiner ,  Anthony A. Loffredo ,  ricardo Bloch ,  Nicholas C. Nahas ,  Keith U. Ingold ,  Theodore V. Kowalchyn

IPC分类号： C08F8/50 ,  C10M143/18

CPC分类号： C10M143/18 ,  B29B7/00 ,  B29C47/92 ,  C08F8/50 ,  B29C2947/92704 ,  B29C47/0004 ,  B29C47/38 ,  B29C47/805 ,  C08F2800/20 ,  C08F2810/10 ,  C10M2205/00 ,  C10M2205/026 ,  C10M2205/06 ,  C10M2205/10

摘要： The molecular weight and the thickening efficiency of primarily oil soluble hydrocarbon polymers, such as hydrogenated random copolymers and block copolymers of styrene-isoprene or styrene-butadiene, polyisobutylene, poly-n-butene, low unsaturation butyl rubbers, low unsaturation EPDM rubbers, preferably ethylene-propylene copolymers, of the type which are to be used as viscosity index improver additives or as precursors for dispersants and multi-functional viscosity improver additives for lubricating oils, are reduced by heating and masticating the polymers in the presence of oxygen or air and in the presence of a transition metal catalyst, preferably in the further presence of a peroxide accelerator.