초록 ▼

the water emerging from the dewatering orifices being present partially or completely in the liquid phase, and the components C or D or mixtures thereof, together or separately from one another, being fed to one or more of the stated extruder sections, either together with the component A or B or mi

the water emerging from the dewatering orifices being present partially or completely in the liquid phase, and the components C or D or mixtures thereof, together or separately from one another, being fed to one or more of the stated extruder sections, either together with the component A or B or mixtures thereof or separately from A and B.

대표청구항 ▼

[ We claim:] [1.] A process for the preparation of toughened thermo-plastics composed ofa) a graft rubber A,b) a thermoplastic polymer B, selected from the group consisting of styrene/acrylonitrile-copolymers, polystyrene, polymethyl methacrylate, polyvinyl chloride, polycarbonate, polybutylene tere

[ We claim:] [1.] A process for the preparation of toughened thermo-plastics composed ofa) a graft rubber A,b) a thermoplastic polymer B, selected from the group consisting of styrene/acrylonitrile-copolymers, polystyrene, polymethyl methacrylate, polyvinyl chloride, polycarbonate, polybutylene terephthalate, polyethylene terephthalate, polyoxymethylene, polyphenylene sulfide, polysulfones, polyether sulfones, polyamides, imidated polymethyl methacrylate, and copolymers based on at least two of the monomers styrene, maleic anhydride, imidated maleic anhydride, methyl methacrylate and imidated methyl methacrylate, wherein in all of the thermo-plastic polymers B some or all of the styrene may be replaced by .alpha.-methylstyrene or by styrenes alkylated in the nucleus,c) a further thermoplastic polymer C differing from B, andd) optionally an additive selected from the group consisting of waxes, plasticisers, lubricants, mold release agents, pigments. dyes, flameproofing agents, antioxidants, light stabilizers and heat stabilizers, fibrous and pulverulent fillers and reinforcing agents, and antistatic agents, or mixtures thereof,which comprisesmixing the graft rubber A, which is water-moist and contains up to 60% of residual water, the thermoplastic polymer B, the further thermoplastic polymer C and the additives D in a twin-screw extruder which has corotating screws and essentially comprises, in the transport direction,at least one unheated metering section in which the water-moist graft rubber A is fed to the extruder by a metering means,at least one unheated squeeze section which serves for mechanically dewatering the graft rubber A and contains at least one retarding element and at least one associated dewatering orifice,at least one section in which the thermoplastic polymer B is introduced as a melt into the extruder,at least one section provided with mixing, kneading or other plasticating elements or a combination of these elements,at least one devolatilization section which is provided with at least one devolatilization orifice and in which the residual water is removed as steam, anda discharge zone,the water emerging from the dewatering orifices being present partially or completely in the liquid phase, and the components C or D or the mixtures thereof, together or separately from one another, being fed to one or more of the stated extruder sections, either together with the component A or B or mixtures thereof or separately from A and B.