C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 65/30 (2006.01) B01D 1/00 (2006.01) B29B 9/04 (2006.01) C08G 65/46 (2006.01) C08J 3/12 (2006.01)
Patent
CA 2497332
For decreasing the residual amount of a solvent in a water soluble nonionic alkylene oxide resin, an apparatus having an evaporation vessel to which a resin solution is charged and a stirring blade having a helical ribbon-shaped portion disposed in the evaporation vessel, in which the stirring blade is disposed so as to scrape-up a resin solution and coating the same to the inner wall surface of the evaporation vessel upon rotation is used. For obtaining resin pellets etc. from a water soluble nonionic alkylene oxide resin in a flowable state removed with the solvent, a manufacturing method of bringing the resin into contact with a metal plate and cooled to solidify is used. Particularly, a water soluble nonionic alkylene oxide resin having a temperature of crystallization from 10 to 60°C is extruded to a predetermined thickness in a molten state, the extruded molten resin is brought into contact with a metal surface having a temperature of the crystallization temperature (Tc) or lower of the resin to cool and solidify the same, and the solidified resin is cut into pellets. Further, for producing resin pellets with less deviation between a predetermined feeding amount and an actual feeding amount, the resin pellets are defined such that each of them has a rectangular shape wherein those having two sides within a range of (L ~ 0.60) mm occupy 98.0% or more assuming the number average length in each of the number distributions for the lengths of three sides of length, width and height as L (mm), and those having remaining one sides within the range described above occupy less than 98.0%, and wherein those having remaining one sides within a range of (L ~ 0.60) mm occupy 70.0% or more or L <= 3.0 mm. For obtaining pulverized products of a water soluble nonionic alkylene oxide resin having a crystallization temperature within a range from 10 to 60°C, a pulverizer having a rotor, at least one rotary blade attached to the circumferential surface of the rotor, at least one fixed blade attached so as to pulverize a resin by shearing with the rotary blade, and a screen attached to the outer circumference of the rotor and receiving the pulverized products, in which the resin is pulverized by the shearing force exerting between the rotary blade and the fixed blade by the rotation of the rotor, pulverized products smaller than the aimed grain size pass through the screen, while particles larger than the aimed grain size are raised by the rotary blade and then again pulverized by the rotary blade and the fixed blade is used as the pulverizer.
Higashizaki Tetsuya
Iwamura Jun
Katsuyama Hiromoto
Kikuta Manabu
Kitada Ritsuo
Dai-Ichi Kogyo Seiyaku Co. Ltd.
Kirby Eades Gale Baker
Nippon Shokubai Co. Ltd.
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