초록 ▼

Acrylonitrile-butadiene-styrene (ABS) resins are prepared by the mass or mass-suspension process employing a tertiary-butyl peroxy initiator having a 10-hour half-life between about 50°and 95°C. wherein initial polymerization of up to about 10 weight percent solids is conducted under plug flow condi

Acrylonitrile-butadiene-styrene (ABS) resins are prepared by the mass or mass-suspension process employing a tertiary-butyl peroxy initiator having a 10-hour half-life between about 50°and 95°C. wherein initial polymerization of up to about 10 weight percent solids is conducted under plug flow conditions. From about 5 to 10 percent conversion to about 40 percent conversion is polymerized with agitation. The remaining polymerization is done with or without agitation. Improved impact resistance is obtained.

대표청구항 ▼

A process for the preparation of acrylonitrile-butadiene-styrene resins wherein styrene and acrylonitrile are copolymerized in the presence of a soluble butadiene reinforcing rubber, the butadiene rubber being dissolved in a mixture of acrylonitrile and styrene, initiating polymerization of the styr

A process for the preparation of acrylonitrile-butadiene-styrene resins wherein styrene and acrylonitrile are copolymerized in the presence of a soluble butadiene reinforcing rubber, the butadiene rubber being dissolved in a mixture of acrylonitrile and styrene, initiating polymerization of the styrene and acrylonitrile thereby causing the rubber under the influence of agitation to separate in the form of a plurality of particles having average diameters of about 0.2 to about 5 microns, continuing polymerization of the styrene and acrylonitrile until from about 50 to about 90 weight percent of the styrene and acrylonitrile have copolymerized, removing at least a majority of non-volatile material therefrom and recovering an ABS polymer, the improvement which comprises incorporating within the ABS solution prior to polymerization a free radical polymerization initiating material which is a tertiary butyl peroxy ester having a 10 hour half-life of between about 50°and 95°C., or mixtures thereof.