Fluorine-containing copolymer, process for preparing the same an

Details Fluorine-containing copolymer, process for preparing the same an Fluorine-containing copolymer, process for preparing the same an

1995-10-13

1997-07-22

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526255, C08F 1418

Patent

active

056504721

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a fluorine-containing copolymer, a process for preparing the same, and a fluorine-containing elastomer. More particularly, the present invention relates to a fluorine-containing copolymer obtained by copolymerizing ethylene, hexafluoropropylene and tetrafluoroethylene, a process for preparing the same, and a fluorine-containing elastomer obtained by curing said fluorine-containing copolymer.


PRIOR ART

An ethylene-hexafluoropropylene copolymer is an elastomeric material, and has mechanical properties which are generally known in relation to fluoroelastomers, and its heat resistance, oil resistance and chemical resistance are close to those of the known properties of the fluoroelastomers. In particular, the ethylene-hexafluoropropylene copolymer is characterized in excellent resistance to methanol and alkali, a excellent electrical insulation, a small dielectric dissipation factor and small frequency dependence.
Since copolymerization reactivities in the copolymerization of ethylene and hexafluoropropylene are very small, it is difficult to copolymerize them under mild conditions. Then, they are copolymerized under very severe conditions such as high pressure of several hundred to several ten thousand kgf/cm.sup.2 and a high temperature of 100.degree. C. or higher, or with the irradiation of radiation.
For example, Tatsukami et al reported the copolymerization of the above two monomers under pressure of 650 to 1385 kgf/cm.sup.2 at a temperature of 115.degree. to 150.degree. C. in a batch system, or under pressure of 1600 to 2000 kgf/cm.sup.2 at a temperature of 160.degree. to 200.degree. C. in a continuous system (J. Chem. Soc., Japan (NIPPON KAGAKUKAI-SHI), 1, 112 (1980)).
Japanese Patent KOKAI Publication No. 83738/1974 discloses preparation of an ethylene/hexafluoropropylene copolymer containing 10 to 50% by mole of hexafluoropropylene under pressure of 40 to 4000 kgf/cm.sup.2 at a temperature of 40.degree. to 300.degree. C.
Further, Japanese Patent KOKAI Publication No. 83789/1974 discloses a continuous process for preparing an ethylene/hexafluoropropylene copolymer containing 7.5 to 8.0% by mole of hexafluoropropylene, and describes that pressure of 800 to 4000 kgf/cm.sup.2, preferably 1000 to 3000 kgf/cm.sup.2 and a temperature of 90.degree. to 300.degree. C., preferably 150.degree. to 250.degree. C. are necessary.
To carry out the copolymerization under such high pressure at such high temperature, or by the radiation polymerization, a special reaction vessel is necessary, and then plant investment increases. Further, such copolymerization processes are not preferred in view of safety. Then, a process of copolymerization which can be carried out under milder conditions has been sought.


SUMMARY OF THE INVENTION

One object of the present invention is to provide a novel fluorine-containing copolymer comprising ethylene and hexafluoropropylene.
Another object of the present invention is to provide a process for preparing a fluorine-containing copolymer comprising copolymerizing ethylene and hexafluoropropylene under mild conditions.
A further object of the present invention is to provide an elastomer which is excellent in amine resistance.
To solve the above problems, the present inventors made various investigations. As the result, it has been found that, when ethylene and hexafluoropropylene are copolymerized, the addition of tetrafluoroethylene as a comonomer makes it possible to copolymerize them under much milder conditions than those used in the conventional copolymerization conditions, that is, under lower pressure at a lower temperature, whereby, a novel copolymer can be obtained, and further it has been found that an elastomer which is obtained by curing the obtained fluorine-containing copolymer is excellent in amine resistance. Then, the present invention has been completed.
A first aspect of the present invention relates to a fluorine-containing copolymer comprising 60 to 80% by mole of ethylene, 20 to 40% by mole of hexafluoropropy

REFERENCES:
patent: 3528954 (1970-09-01), Carlson
patent: 3817951 (1974-06-01), Robinson
patent: 4028431 (1977-06-01), Futami et al.
patent: 4123603 (1978-10-01), Stewart, Jr.
patent: 4256856 (1981-03-01), Ito et al.
patent: 4510301 (1985-04-01), Levy
patent: 4678847 (1987-07-01), Zhang et al.
patent: 4730029 (1988-03-01), Wachi et al.
patent: 5175223 (1992-12-01), Brinati et al.
patent: 5264509 (1993-11-01), Arcella et al.

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