Solid phase polymerization of nylon

Details Solid phase polymerization of nylon Solid phase polymerization of nylon

1993-10-29

1995-10-24

Seidleck, James J.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528503, 528903, C08F 616, C08J 300

Patent

active

054611415

ABSTRACT:
The molecular weight, melt viscosity and melt strength of nylon 4.6 are increased by a solid phase polymerization process conducted under anhydrous conditions at temperatures below the melting point of the nylon. In a preferred embodiment, the nylon used in the process is free of surface air, has a moisture content less than 0.2 wt %, preferably less than 0.02 wt %, and more preferably less than 0.01 wt %. It is also preferred that the extractable impurities are less than 0.2 wt %, preferably less than 0.02 wt %, and more preferably less than 0.01 wt %. The nylon 4.6 product of this anhydrous process is characterized by molecular weights in excess of 50,000, melt viscosities in excess of 600 Pascal.seconds, relative viscosities in excess of 160 and degradation ratios of 7 or less.

REFERENCES:
patent: 2172374 (1939-09-01), Flory
patent: 3821171 (1974-06-01), Beaton
patent: 4757131 (1988-07-01), Bongers

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