Preparation of high molecular polytetramethylene adipamide

Details Preparation of high molecular polytetramethylene adipamide Preparation of high molecular polytetramethylene adipamide

C - Chemistry, Metallurgy

08

G

402/243

C08G 69/26 (2006.01) C08G 69/28 (2006.01)

Patent

CA 1165941

ABSTRACT OF THE DISCLOSURE A process is described for the preparation of high-molecular weight white polyamides, substan- tially consisting of units of ?NH-(CH2)4-NH- CO(CH2)4-CO?, by the after-condensation of a corresponding low-molecular prepolymer, consisting substantially of a molecular chain of units of ?NH-(CH2)4-NH-CO(CH2)4-CO?, in which process the prepolymer which is employed has been prepared in the presence of an excess of 0.5 to 15 moles-% of 1,4-diaminobutane with respect to the quantity stoi- chiometrically equivalent to the adipic acid ap- plied. This prepolymer is thereafter subjected to the after-condensation reaction in the solid phase in an atmosphere containing water vapor.

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