摘要:
The invention relates to a process for continuous preparation of alkyl (meth)acrylates by transesterification of methyl (meth)acrylate using alcohols which are high-boiling relative to methanol. A particular workup technique achieves product qualities which have hitherto not been attained. Very high space-time and overall yields can also be achieved.
摘要:
The invention relates to a process for continuous preparation of alkyl (meth)acrylates by transesterification of methyl (meth)acrylate using alcohols which are high-boiling relative to methanol. A particular workup technique achieves product qualities which have hitherto not been attained. Very high space-time and overall yields can also be achieved.
摘要:
The invention relates to a vented extruder (1) for the devolatilization of a polymer material. The vented extruder (1) encompasses at least one drive (4), at least one gearbox (5), at least one rotatably driven extruder screw (3), at least one first material feed (6) and at least one extrudate outlet (13). A feature of the vented extruder (1) according to the invention is that the drive, encompassing drive (4) and gearbox (5), has been provided in the region of that end of the extruder screw (3) that is downstream in relation to the direction of conveying of the polymer.
摘要:
The invention relates to novel composite materials which are made of at least one material containing cellulose, preferably wood, and at least one plastic material, and which have improved mechanical and weather resistance properties.
摘要:
The invention provides a process for preparing 1-alkoxy-2-methyl-1-oxopropan-2-yl(meth)acrylate, e.g. 1-methoxy-2-methyl-1-oxopropan-2-yl(meth)acrylate, by transesterifying alkyl α-hydroxyisobutyrates. Copolymerization of such monomers in the preparation of poly(meth)acrylate-based moulding materials improves the heat distortion resistance thereof.
摘要:
The invention relates to a stirred-tank reactor and to a method for carrying out a polymerization reaction of unsaturated monomers using a stirred-tank reactor. According to the invention, said stirred-tank reactor is characterized in that the product discharge point is designed as the central base outlet that is at least partially traversed by the agitator shaft. Said polymerization is performed continuously under positive pressure, so that the stirred-tank reactor is operated hydrodynamically.
摘要:
The invention relates to a stirred-tank reactor and to a method for carrying out a polymerisation reaction of unsaturated monomers using a stirred-tank reactor. According to the invention, said stirred-tank reactor is characterised in that the product discharge point is designed as the central base outlet that is at least partially traversed by the agitator shaft. Said polymerisation is performed continuously under positive pressure, so that the stirred-tank reactor is operated hydrodynamically.
摘要:
The invention relates to novel poly(meth)acrylates for producing moulding compositions. In particular, the invention relates to novel methacrylates having ester groups which, in the cleavage process, liberate at most only a very small amount of components which are not re-copolymerizable. Copolymerization of monomers of this type in the production of the novel poly(meth)acrylates for moulding compositions brings about only minimal alteration of the heat resistance of these materials or may indeed improve the same.
摘要:
The invention relates to novel composite materials with improved mechanical properties and improved weathering resistance, said composite materials being made of at least one material containing cellulose, preferably wood, and at least one plastic, and to a method for producing said composite materials and for using same.
摘要:
The invention relates to a copolymer for producing molded compounds or cast glass for the production of molded bodies having increased dimensional stability under heat, obtainable from the copolymerization of A) one or more ethylenically unsaturated ester compounds of the formula (I), where R1 is hydrogen or methyl and R2 a linear or branched alkyl group with 1 to 8 carbon atoms, B) one or more ethylenically unsaturated ester compounds of the formula (II), where R3 is hydrogen or methyl and R4 a cyclic group with 8 to 30 carbon atoms, C) one or more ethylenically unsaturated ester compounds of the formula (III), where R5 is hydrogen or methyl and R6 and R7, independently of each other, are hydrogen or a linear or branched group with 1 to 40 carbon atoms.