Catalyst and method for the production of polytetrahydrofuran

Details Catalyst and method for the production of polytetrahydrofuran Catalyst and method for the production of polytetrahydrofuran

2006-05-09

2006-05-09

Johnson, Christina (Department: 1725)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S266000, C526S268000, C526S270000, C526S271000, C502S080000

Reexamination Certificate

active

07041752

ABSTRACT:
Polytetrahydrofuran, polytetrahydrofuran copolymers, diesters or monoesters of these polymers are prepared by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer, which is in the form of shaped catalyst bodies or catalyst particles having a volume of the individual shape of the body or particle of at least 0.05 mm3, preferably at least 0.2 mm3, in particular 1 mm3, and has at least one of the features a) and b):a) a pore radius distribution having at least one maximum in the pore radius range from 100 to 5000 Å,b) a pore volume of catalyst pores having radii of 200–3000 Å of greater than 0.05 cm3/g and/or a pore volume of pores having radii of 200–5000 Å of greater than 0.075 cm3/g and/or a pore volume of pores having radii of >200 Å of greater than 0.1 cm3/g.

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