Branched polyformals and copolyformals their preparation and...

Details Branched polyformals and copolyformals their preparation and... Branched polyformals and copolyformals their preparation and...

2007-04-24

2007-04-24

Boykin, Terressa (Department: 1711)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C264S176100, C264S219000, C359S642000, C528S126000, C528S174000, C528S198000, C528S205000, C528S219000

Reexamination Certificate

active

10924620

ABSTRACT:
A branched (co)polyformal is disclosed. The (co)polyformal contains structural units conforming to at least one the general formulae (1a) and (1b)wherein each of -E- and -D- independently of one another denote an aromatic radical having 6 to 40 C atoms, k is 1 to 4,000, o is 1 to 4,000, m is z/o and n is (o-z)/o, where z is 0 to o.The branched (co)polyformal is characterized by its reduced water uptake and improved hydrolytic stability. Also disclosed are processes for its preparation and use in the production of molded articles.

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Patent Abstracts of Japan Bd. 0143, Nr. 42 (C-0743), Jul. 24, 1990 & JP 2 124935 A (Idemitsu Kosan Co Ltd), May. 14, 1990.

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