Producing process for thermoplastics

A process is claimed for the prodn. of impact-modified thermoplastics (I) by (a) mechanical dehydration of a moist elastomer component (A) contg. up to 60 wt% residual water and (b) mixing the dried elastomer obtd. (A') with a thermoplastic polymer (B) in a screw machine. The process is carried...

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Bibliographische Detailangaben
Hauptverfasser:	J. HOFMANN, H. OHLIG, N. GUENTHERBERG
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MAKING GRANULES OR PREFORMS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	A process is claimed for the prodn. of impact-modified thermoplastics (I) by (a) mechanical dehydration of a moist elastomer component (A) contg. up to 60 wt% residual water and (b) mixing the dried elastomer obtd. (A') with a thermoplastic polymer (B) in a screw machine. The process is carried out in a twin screw extruder with synchronous double-threaded screws and with the following sequence in the direction of feed: (1) a metering section for introducing component (A) into the extruder via a metering device, (2) squeezing section(s) for removing the water, with accumulator element(s) and associated water outlet(s), (3) section(s) fitted with a feeder screw or with mixing, kneading and/or other plasticising elements, (4) section(s) in which polymer (B) is added as a melt, (5) section(s) fitted with mixing, kneading and/or other plasticising elements, (6) degassing section(s) with gas outlets, in which residual water is removed as vapour, and (7) a discharge zone. The water emerging from the outlets in section (2) is partly or completely in the liq. phase, and the extruder is operated at a screw speed of 50-600 r.p.m., with a mean shear rate of 20-240 s. Also claimed are impact-modified thermoplastic moulding materials (I) obtd. by this process.