Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-07-26
1990-11-20
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525316, C08F27900
Patent
active
049720244
ABSTRACT:
Disclosed herein is a rubber-modified styrene copolymer which contains as an impact strength modifier a rubbery polymer having a viscosity of 2-250 centipoises as measured at 25.degree. C. as a 5 wt. % styrene solution and a styrene insoluble content lower than 0.1 wt. %, produced by anionic polymerization and dispersed in a continuous phase of a styrene-acrylonitrile copolymer. The rubbery polymer contains small particles of the same styrene-acrylonitrile copolymer occluded in the form of cells. The areas of particles in each of which the maximum cell diameter is smaller than 0.1 .mu.m are at least 40% of the area of all the particles of the rubbery polymer and the volume average particle size of these particles is 0.1-0.4 .mu.m. The weight ratio of the monomers in the styrene-acrylonitrile copolymer is 90/10.gtoreq.styrene/acrylonitrile.gtoreq.55/45. Per 100 parts by weight of the copolymer, the proportions of polymers having a molecular weight greater than 1,000,000 is smaller than 0.5 part by weight while the proportion of polymers having a molecular weight greater than 1,200,000 is smaller than 0.01 part by weight.
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Ando Toshihiko
Furuta Yasuo
Ito Norifumi
Iwamoto Mune
Matsubara Tetsuyuki
Bleutge John C.
Jagannathan Vasu S.
Mitsui Toatsu Chemicals Inc.
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