PRODUCTION METHOD FOR POLYAMIDE

WIPO Patent Application WO/2013/129341

A1

The present invention provides a production method for polyamides, whereby adherance of matter to a reaction tank gas phase section and a vapor tube is suppressed and little mixing in of unmelted matter caused by said adhered matter occurs in the obtained product, and in which: a diamine component including at least 70 mol% paraxylene diamine and a dicarboxylic acid component including at least 70 mol% C6-18 aliphatic dicarboxylic acid are directly melt-polymerized in the absence of a solvent, in a batch-type reaction device comprising agitation blades; (1) the diamine component and the dicarboxylic acid component are reacted under pressure conditions of 0.2-0.5 MPa (Abs); (2) the gas phase section temperature inside the reaction tank during the reaction is held at 200°C or higher; (3) inside the reaction tank is agitated such that the agitation Froude number indicated by a specific formula is 0.0002-0.15, from the start of the addition of the diamine component until after the completion thereof and before pressure reduction starts; and (4) agitation blades are used that do not have a structural body in the horizontal direction, or have a structural body in the horizontal direction that does not come in contact with the reaction fluid or the boundary of the gas phase section during agitation.

TOCHIHARA TATSUYA (JP)
SHINOHARA KATSUMI (JP)

PCT/JP2013/054828

September 06, 2013

February 25, 2013

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MITSUBISHI GAS CHEMICAL CO (JP)

C08G69/28

WO2011065347A1

2011-06-03

JP2010007055A	2010-01-14
JP2010007056A	2010-01-14
JPH04102631U	1992-09-04
JPS57200420A	1982-12-08
JP2010007056A	2010-01-14
JP2010007055A	2010-01-14

See also references of EP 2821425A4

OHTANI, Tamotsu (JP)
Tamotsu Otani (JP)

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