Poly(arylene thioether-ketones) improved in melt stability and p

Details Poly(arylene thioether-ketones) improved in melt stability and p Poly(arylene thioether-ketones) improved in melt stability and p

1991-01-17

1991-09-03

Foelak, Morton

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

Synthetic resins

Treating polymer containing material or treating a solid...

528502, 528226, 528388, C08F 600

Patent

active

050456300

ABSTRACT:
Disclosed herein is a process for the preparation of a poly(arylene thioether-ketone) improved in melt stability, which comprises subjecting a poly(arylene thioether-ketone) (PTK) to a heat treatment for 5-5.times.10.sup.3 minutes in a powdery state and a temperature range of 200.degree.-350.degree. C. The PTK has predominant recurring units of the formula ##STR1## and has a melting point, Tm of 310.degree.-380.degree. C., a melt crystallization temperature, Tmc (420.degree. C./10 min) of at least 210.degree. C., a residual melt crystallization enthalpy, .DELTA.Hmc (420.degree.C./10 min) of at least 10 J/g and a reduced viscosity of 0.2-2.0 dl/g. PTKs improved in melt stability and prepared in accordance with the above-described preparation process are also disclosed.

REFERENCES:
patent: 4690972 (1987-09-01), Johnson et al.
patent: 4716212 (1987-12-01), Gaughan
patent: 4892929 (1990-01-01), Geibel et al.
patent: 4897307 (1990-01-01), Beck et al.

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