| 摘要 |
1525774 Stabilizing acrylonitrile copolymers STANDARD OIL CO 17 March 1976 [28 April 1975] 10666/76 Heading C3K Polymers of a major proportion of an unsaturated nitrile, preferably acrylonitrile, with a minor proportion of an unsaturated comonomer are stabilized against thermal discoloration with 0À1-1À5 parts per 100 parts of copolymer of at least one ester where R 7 is a hydrocarbon group, preferably containing 1-20 C atoms. The copolymer may be prepared by polymerization in an aqueous medium, optionally in the presence of a preformed diene rubber. |
