High molecular weight polymers and copolymers of 3-hydroxyoxetan

Details High molecular weight polymers and copolymers of 3-hydroxyoxetan High molecular weight polymers and copolymers of 3-hydroxyoxetan

1989-10-10

1990-10-23

Anderson, Harold D.

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

Synthetic resins

From heterocyclic reactant containing as ring atoms oxygen,...

528410, C08G 6522, C08G 6532, C08G 6518

Patent

active

049653423

ABSTRACT:
High molecular weight (Mw>25,000, preferably >50,000; n.sub.inh up to 3) ear atactic poly (3-hydroxyoxetane) (PHO) are made by polymerizing the trimethylsilyl ether of 3-hydroxyoxetane with a coordination catalyst, or preferably with a cationic catalyst such as i-Bu.sub.3 Al-0.7 H.sub.2 O, followed by hydrolysis. The new polymer is atactic, highly crystalline, has a melting point of 155.degree. C., is devoid of measurable end groups, has a two-peak .sup.13 C-NMR, and can be readily compression molded at 200.degree. C. to a film which can be drawn at room temperature to give enhanced strength.
Isotactic high molecular weight PHO (mp=223.degree. C.; .DELTA.H.sub.f =25.6 cal/g) and branched high molecular weight PHO are also prepared.

REFERENCES:
patent: 3694383 (1972-09-01), Azami et al.
patent: 3839235 (1974-10-01), Margraff

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