Process for the manufacture of polyacetals

Details Process for the manufacture of polyacetals Process for the manufacture of polyacetals

1987-06-05

1989-02-21

Lieberman, Allan M.

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

Synthetic resins

From aldehyde or derivative thereof as reactant

528250, 528497, 528498, 528501, 525 54, 525472, C08L 5904

Patent

active

048066222

ABSTRACT:
Polyacetal obtained by the polymerization of trioxane, for example, suspended in an organic solvent, in the presence of a comonomer (for example, ethylene oxide), is stabilized by hydrolysis in the heated state under pressure and then, after hydrolysis, the reaction mixture is depressurized to atmospheric pressure in order to release an aqueous phase containing the polymer and a vapor phase which contains formaldehyde and trioxane. According to the invention, the latter is recycled directly into the formaldehyde trimerization stage under reduced pressure.

REFERENCES:
patent: 3027352 (1962-03-01), Walling et al.
patent: 3197437 (1965-07-01), Wall
patent: 3225005 (1965-12-01), Asmuth et al.
patent: 4024105 (1977-05-01), Sextro et al.
patent: 4087411 (1978-05-01), Sugio et al.
patent: 4458064 (1984-07-01), Chatterjee
Angew. Chem., vol. 79, pp. 512-514 (1967) "Preparation of Trioxane" by K. Weissermel et al.
Hydrocarbon Processing, vol. 45, pp. 155-170 (1966) "Polyacetal Resins-A 1966 Review" by M. Sittig et al.

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