Process for the manufacture of coarse-granular oxymethylene poly

Details Process for the manufacture of coarse-granular oxymethylene poly Process for the manufacture of coarse-granular oxymethylene poly

1977-05-04

1978-09-05

Phynes, Lucille M.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528503, 528270, C08G 228

Patent

active

041119126

ABSTRACT:
Granular oxymethylene polymers are prepared by cooling a solution or dispersion of an oxymethylene polymer, the temperature of the said solution or dispersion being above the sintering temperature of the oxymethylene polymer, to a temperature just below the said sintering temperature. As dissolving or dispersing agent there is used a mixture of methanol and water. The cooling of the said solution or dispersion is effected in two stages while using a liquid cooling agent or a cooling device. After precipitation the coarse-granular polymer is separated from the fine-granular portion. It is suitable as engineering plastic for preparing molded articles.

REFERENCES:
patent: 3174948 (1965-03-01), Wall et al.
patent: 3219623 (1965-11-01), Berardinelli
patent: 3371066 (1968-02-01), Grundmann et al.
patent: 4046738 (1977-09-01), Sextro et al.

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