Multi-step radiation process of producing polyoxymethylenes

Details Multi-step radiation process of producing polyoxymethylenes Multi-step radiation process of producing polyoxymethylenes

1974-08-15

1977-09-20

Turer, Richard B.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

260 67FP, C08G 202

Patent

active

040495183

ABSTRACT:
A multi-step process of producing polyoxymethylenes by solid state polymerization of trioxane is disclosed.
Trioxane is irradiated with ionizing radiation within a temperature range in which no polymerization of trioxane takes place. The irradiated trioxane is then polymerized by raising the temperature to a value at which polymerization of trioxane takes place, said temperature value being at least 15.degree. C above the first mentioned temperature. The polymerization is effected in the presence of an amount of alkyl acetal. The polymerized product thus obtained is then again irradiated, whereupon further polymerization of the irradiated product takes place.
The resulting polyoxymethylenes are snow white and exhibit excellent thermal stability. They also have high molecular weights.

REFERENCES:
patent: 3242063 (1966-03-01), Okamura et al.
patent: 3305464 (1967-02-01), Marans
patent: 3346663 (1967-10-01), Kern et al.
patent: 3438883 (1969-04-01), Marans et al.
patent: 3684767 (1972-08-01), Ito et al.
patent: 3830715 (1974-08-01), Ito et al.

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