Process for preparing oxymethylene polymers in a granular form

Details Process for preparing oxymethylene polymers in a granular form Process for preparing oxymethylene polymers in a granular form

1978-01-26

1979-04-24

Lee, Lester L.

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

Synthetic resins

From aldehyde or derivative thereof as reactant

528495, 528499, 528503, C08G 222, C08G 228, C08G 1602

Patent

active

041513460

ABSTRACT:
Oxymethylene polymers are obtained in a granular form by cooling a solution or dispersion of an oxymethylene polymer, the temperature of which solution or dispersion is above the sintering temperature of the oxymethylene polymer, to a temperature just below the sintering temperature of the oxymethylene polymer. As dissolving or dispersing agent as well as precipitating and cooling agent there is used a mixture of methanol and water having a methanol content of at least 75% by weight. The oxymethylene polymer obtained is suitable as engineering plastic for preparing moulded articles.

REFERENCES:
patent: 3371066 (1968-02-01), Grundmann et al.

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