Process of continuously producing polyester polymer
AssigneeDaicel Chemical Industries, Ltd.
InventorJun Watanabe
Life of this patent
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Abstract
The present invention uses a reactor that combines devices having a special portion structure to solve the difficulty of uniform blending due to the reactants becoming highly viscous, the difficulty of heat removal, and the increase in pressure loss, thus leading to continuous production of a polyester-based polymer stably having excellent quality.
Claims15
A process of producing a polyester-based polymer, characterized by comprising continuously feeding a polymer (A) having hydroxyl groups and/or ester linkages and one or more species of cyclic esters (B) into a reactor comprising a column-shaped agitating mixer having two or more shafts of agitation and a static mixer connected to an outlet thereof and then subjecting them to ring opening polymerization, to obtain a copolymer (C)
- wherein the agitating mixer has (i) a combination of a screw paddle and a kneading disk paddle, (ii) a combination of kneading disk paddles, (iii) glasses blades or (iv) lattice blades.
A process of continuously producing a polyester-based polymer, characterized by continuously feeding a polymer (A) having hydroxyl groups and/or ester linkages and one or more species of cyclic esters (B) into a continuous reactor having a static mixer and then subjecting them to ring opening polymerization to obtain a copolymer (c) in which:
- the continuous reactor, whose mixer(s) consist(s) essentially of a static mixer, at least comprises a static mixer (SM(i)) for use in an early stage of reaction and a static mixer (SM(e)) for use in a final stage of reaction, the static mixer (SM(e)) being connected to SM(i) in series and being a type different from that of SM(i);
- the X (i:e) value is 4 or greater, the value being calculated by substituting the pressure loss ratios Zi of SM(i) and Ze of SM(e) and the inside diameters Di of SM(i) and De of SM(e) into Equation (1) below:
- X(i:e)=(Zi×De4)/(Ze×Di4) (1)
Dependencies are inferred from the claim text.