Process for the stabilization of fluoropolymers

Details Process for the stabilization of fluoropolymers Process for the stabilization of fluoropolymers

1990-06-21

1991-12-31

Ullah, Akm

Optical waveguides

Having particular optical characteristic modifying chemical...

Of waveguide core

385145, 385144, G02B 600

Patent

active

050766597

ABSTRACT:
Melt-processible copolymers of at least two halogenated comonomers from a defined class, especially perhalogenated comonomers, and particularly perfluorinated comonomers, of improved thermal stability are obtained by first contacting the copolymers with a stabilizing agent selected from bases (ammonia or amines) having a boiling point at normal pressure of at most 130.degree. C. and tertiary alcohols having up to 8 carbon atoms, to form an intermediate, drying the intermediate at about 70.degree.-150.degree. C., and fluorinating the intermediate at a temperature between 20.degree. C. and the lowest temperature at which the copolymer exhibits a solid state transistion, then removing excess fluorine and by-products and recovering the stabilized copolymer. Such stabilized copolymers are useful for a variety of technically important applications, including as cladding for optical fibers, substrates for electronic components, thermal laminates, pipes, tubes, and fittings, etc.

REFERENCES:
patent: 3674758 (1972-07-01), Carlson
patent: 4599386 (1986-07-01), Carlson et al.
patent: 4946902 (1990-08-01), Bekiarman et al.

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