Method for drying polyamide and method for solid-phase polymeriz

Details Method for drying polyamide and method for solid-phase polymeriz Method for drying polyamide and method for solid-phase polymeriz

1995-08-07

1996-11-19

Mullis, Jeffrey C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528331, 528335, 528347, 528480, 528502C, C08G 6928

Patent

active

055764150

ABSTRACT:
There are disclosed a method for drying and a method for solid-phase polymerizing a crystallizable polyamide being in an amorphous state which comprises regulating the moisture concentration in the polyamide at its glass transition temperature to at least 0.15% by weight as determined by Karl Fisher titration; heating the polyamide thus regulated at a pressure of at least one arm without reducing the moisture to crystallize the same up to a crystallinity of at least 15% and; further heating the polyamide thus crystallized at a temperature lower than its melting point under reduced pressure with a batchwise heating apparatus. It is made possible according to the method for drying or the method for solid-phase polymerizing the crystallizable polyamide to effect its crystallization without causing tackified sticking or solidified sticking of the polyamide, along with drying or solid-phase polymerization with single apparatus and process, while dispensing with any pretreatment such as surface modification and preliminary treatment equipment intended for crystallization.

REFERENCES:
patent: 3840500 (1974-10-01), Ryffel et al.
patent: 4987215 (1991-01-01), Keil et al.
patent: 5006629 (1991-04-01), Santa et al.
patent: 5051491 (1991-09-01), Pipper et al.
"A Method for Measurement of Crystallization Rate", J. H. Magill, Polymer 2, pp. 221-233, Jan. 1961.

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