C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/104, 402/116
C08G 2/12 (2006.01) B01J 19/20 (2006.01) C08G 2/00 (2006.01) C08G 2/10 (2006.01) C08G 2/18 (2006.01)
Patent
CA 1140297
ABSTRACT In producing a polyacetal homopolymer or copolymer a liquid starting mixture containing molten trioxane and a catalyst and optionally a comonomer is continuously fed through a feed opening of a reactor. The reactor is a continuously stirring-type mixer comprising a hollow barrel having the feed opening for the starting materials spaced-apart from discharge opening for the reaction product. The barrel has a cross-sectional surface corresponding to two overlapping eccentric circles having the same diameter. A jacket is pro- vided on the periphery of the barrel for temperature control. Stirring shafts disposed within the hollow barrel parallel to each other extend longitudinally of the barrel through the central parts of the circles. The stirring shafts having a plurality of plate-like paddles fixed thereto in such a manner that the paddles fixed to one stirring shaft are kept in contact with each other. The cross-section of each of the paddles taken perpendicularly of the axial direction of the stirring shaft has the shape of a convex lens, an ellipse or a quasipoly- gon inscribing a phantom circle at each vertex. One of the paddles and another facing paddle fixed to the other stirring shaft are positioned such that the one rotates while the edges thereof keep a slight clearance from the inner surface of the barrel and the other paddle. The starting mixture is polymerized while being moved towards the discharge opening by the rotation of the paddles. The reaction product is withdrawn in the form of a finely divided solid from the discharge opening. The improvement lies in that the profiles of the paddles are charged or the arrangement of the paddles is changed continuously or step- wise, so that the transportability of the reaction mixture becomes progressively smaller from the feed opening toward the discharge opening of the reactor. On the same stirring shaft, the paddles are arranged such that with respect to one paddle, a paddle adjacent thereto on the discharge opening side of the reactor deviates by an angle of less than 180° in the direction opposite to the rotating direction of the stirring shaft.
362927
Amemiya Akira
Furusawa Tomotaka
Ono Yoshihiro
Sugio Akitoshi
Taka Kazuyoshi
Mitsubishi Gas Chemical Company Inc.
Smart & Biggar
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