Process for producing poly-tetrahydrofuran

Details Process for producing poly-tetrahydrofuran Process for producing poly-tetrahydrofuran

2011-08-02

2011-08-02

Truong, Duc (Department: 1765)

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

Synthetic resins

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

C528S403000, C528S482000, C528S485000, C528S499000

Reexamination Certificate

active

07989582

ABSTRACT:
The present invention relates to a process for producing tetrahydrofuran polymer or tetrahydrofuran copolymer by using heteropolyacid catalyst, and more particularly, to a process for producing tetrahydrofuran polymer by using hydronium ion water having a pH of 5.5 or less as a reaction initiator in the initiation step.

REFERENCES:
patent: 4568775 (1986-02-01), Aoshima et al.
patent: 4658065 (1987-04-01), Aoshima et al.
patent: 5416240 (1995-05-01), Weyer et al.
patent: 6979752 (2005-12-01), Bertola et al.

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