Process for the simultaneous preparation of polyamides with...

Details Process for the simultaneous preparation of polyamides with... Process for the simultaneous preparation of polyamides with...

2005-02-08

2005-02-08

Woodward, Ana (Department: 1711)

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

Synthetic resins

From carboxylic acid or derivative thereof

C525S432000, C528S310000, C528S312000

Reexamination Certificate

active

06852829

ABSTRACT:
A process for the simultaneous preparation of polyamide-6 with at least two different viscosities comprising prepolymerisation of ε-caprolactam and/or other polyamide-6 precursors in the presence of water, wherein at least part of the necessary water is supplied to the prepolymerisation via the gas phase and the obtained prepolymer is progressively moved and treated with an inert gas in at least two condensation reaction zones or reactors, placed in series, and the prepolymerisation and condensation are carried out in reactor(s) or reaction zones having a self-renewing interface between molten phase and gas phase with a large surface/volume ratio of the molten phase and the molten phase is relatively strong mixed.

REFERENCES:
patent: 2562796 (1951-08-01), Koch
patent: 4433116 (1984-02-01), Largman et al.
patent: 4540774 (1985-09-01), Gerking et al.
patent: 4963650 (1990-10-01), Bokareva et al.
patent: 5681952 (1997-10-01), Sifniades et al.
patent: 5696227 (1997-12-01), Mumcu
patent: 923137 (1961-03-01), None
patent: 0023501 (1999-10-01), None
patent: 0023502 (1999-10-01), None
Derwent Publications English Abstract of JP 57 053532, Mar. 30, 1982, AN 1982-36489E.

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