Method for making aromatic polyformals

Details Method for making aromatic polyformals Method for making aromatic polyformals

1978-03-23

1981-04-07

Lee, Lester L.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528126, 528128, 528174, 528205, C08G 6540

Patent

active

042607337

ABSTRACT:
A method is provided for making linear film forming aromatic polyformals having a reduced percent by weight of aromatic polyformals in the cyclic state. Reduced cyclic polyformal content in the linear aromatic polyformal is achieved by a filtration of the reaction product of a bisphenol and methylene halide in the presence of an alkali metal hydroxide, followed by the addition of an antisolvent to the reaction mixture to effect reverse precipitation.

REFERENCES:
patent: 3069386 (1962-12-01), Barclay, Jr.

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