Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1989-10-24
1991-05-28
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525338, 526255, 526300, C08F 1418
Patent
active
050196308
ABSTRACT:
A novel rubbery copolymer comprising (A) 5 to 95% by weight of structural units based on 1,1-dicyano-2-vinylcyclopropane and (B) 95 to 5% by weight of structural units based on a 1,1-difluoro-2-vinylcyclopropane and having a weight average molecular weight, calculated for standard polystyrene, of 2,000 to 2,000,000 is provided by copolymerizing the 1,1-dicyano-2-vinylcyclopropane and the 1,1-difluoro-2-vinylcyclopropanes in the presence of a free radical initiator. This rubbery copolymer and its hydrogenated product give a vulcanizate having improved oil resistance, cold resistance, thermal resistance, sour gasoline resistance, alcohol-containing gasoline resistance and alcohol-containing sour gasoline resistance.
REFERENCES:
patent: 2615878 (1952-10-01), Folt
patent: 2964507 (1960-12-01), Knoth, Jr.
CA 92(4): 22860g, "Polymerizations of Substituted Cyclopropanes", Seoul 131, S. Korea, 1979.
CA 110(20): 173881f, "Radical Ring-Opening Polymerization Behaviour", Endo et al., 1989.
CA 79(10):53812d, "Cationic Polymerization of 1,1-Difluoro-2-Vinylcyclopropane", Volchek et al., 1973.
J. Polymer Science, Polymer Chem. Edition, 17, 3169 (1979), Cho et al.
Polymer Science (USSR), 13 (9), 2421 (1971), Zhulin et al.
Aonuma Mitsuyoshi
Chida Takeshi
Maeda Akio
Morozumi Yukihiko
Ohishi Tetsu
Nippon Zeon Co. Ltd.
Sarofim N.
Schofer Joseph L.
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