Solvents for amorphous fluoropolymers

Details Solvents for amorphous fluoropolymers Solvents for amorphous fluoropolymers

1999-06-23

2001-06-19

Zitomer, Fred (Department: 1713)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S544000, C524S545000, C524S546000

Reexamination Certificate

active

06248823

ABSTRACT:

This invention concerns a composition comprising amorphous fluorine-containing copolymers at least partially dissolved in a hydrofluorocarbon fluid.
TECHNICAL BACKGROUND OF THE INVENTION
Fluoroproducts are useful as deposits in the form of thin films or coatings. To provide these coatings in a form that can be sprayed or spin or dip coated on a substrate, it is necessary to dissolve amorphous fluoropolymers in suitable solvents. Many fluorocarbon fluids have been reported as solvents for amorphous perfluoropolymers. For example, U.S. Pat. No. 5,637,663 identifies perfluorodialkylsulfides, perfluorodialkylsulfones, perfluoroalkylsulfonyl fluorides, perfluorocarbons, perfluorobenzene, and perfluorobutyltetrahydrofuran as solvents for amorphous poly(hexafluoropropene/tetrafluyoroethylene) [poly(HFP/TFE)]. U.S. Pat. No. 5,637,663 also reports that the hydrofluorocarbon CF
3
CFHCFHCF
2
CF
3
is a nonsolvent for poly(HFP/TFE). In EP 0803 557 A1, Ausimont reports the use of perfluoropolyethers and perfluoroamines containing —OCF
2
H, —OCF(CF
3
)H, —OCF
2
CF
2
H, and OCF(CF
2
H)CF
3
groups as solvents for amorphous polymers containing the dioxole monomer,
Except for the perfluorocarbons, the heretofore disclosed solvents contain oxygen or nitrogen heteroatoms.
The present invention is a coatable composition comprising amorphous fluorine-containing copolymers at least partially dissolved in a selected hydrofluorocarbon fluid.
SUMMARY OF THE INVENTION
This invention provides a liquid/gelatinous composition of matter comprising:
(a) a solvent or a mixture of solvents selected from the group consisting of:
(i) a C
n
F
2n+2−x
H
x
compound, wherein n is an integer from 6 to 15 and x is an integer from 1 to 3;
(ii) a C
n
F
2n′−x′
H
x′
compound, wherein n′ is an integer from 7 to 15 and x′ is an integer from 1 to 3; and
(b) one or more amorphous fluoropolymers selected from the group consisting of:
(i) poly(HFP/TFE);
(ii) iodine ended poly(TFE/PMVE);
(iii) poly(TFE/PMVE/PEVE);
(iv) poly(TFE/PDD);
(v) poly(TFE/perfluorovinylether);
(vi) poly(CF
2
═CF(CF
2
)
2
OCF═CF
2
/TFE); and
wherein fluoropolymer has no detectable Tm (<1 J/g) by differential scanning calorimetry and wherein the amorphous fluoropolymer makes up 0.05 to 30 wt % of the composition and wherein at least 5% of the amorphous fluoropolymer present is in solution in the solvent or mixture of solvents.
In a preferred embodiment the amorphous copolymer makes up about 0.5 to 10 wt % of the mixture, and most preferably about 1 to 5 wt % of the mixture.


REFERENCES:
patent: 5182342 (1993-01-01), Feiring et al.
patent: 5268411 (1993-12-01), Yokotsuka et al.
patent: 5637663 (1997-06-01), Anolick et al.
patent: 0803557 A1 (1997-10-01), None
Patent Abstracts of Japan, Publication Number 07278314, Publication Date Oct. 24, 1995.
Patent Abstracts of Japan, Publication Number 05140400, Publication Date: Jun. 8, 1993.

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