A fluorine-containing resin composition comprising at least one fluorine-containing polycyclic compound (A) selected from the group consisting of the following compounds (A1), (A2) and (A3), and a polymer (B) having a fluorine-containing alicyclic structure: PA1 (A1) a fluorine-containing non-condensed polycyclic compound having at least two fluorine-containing rings bonded by a bond containing at least one member selected from the group consisting of a triazine ring, an oxygen atom, a sulfur atom, a phosphorus atom and a metal atom, each of said fluorine-containing rings being a carbon ring or a heterocyclic ring, PA1 (A2) a fluorine-containing non-condensed polycyclic compound having at least three fluorine-containing rings bonded directly or by a bond containing a carbon atom, each of said fluorine-containing rings being a carbon ring or a heterocyclic ring, PA1 (A3) a fluorine-containing condensed polycyclic compound which is a condensed polycyclic compound composed of at least three carbon rings or heterocyclic rings; wherein compound (A1), (A2) or (A3) some or all of hydrogen atoms are substituted by a fluorine atom or a fluorine-containing group.

The present invention relates to a fluorine-containing resin composition
 having processability improved without impairing excellent physical
 properties of a polymer having a fluorine-containing alicyclic structure.
 Heretofore, a polymer having fluorine-containing alicyclic structure is
 used, for example, for a protecting film for electronic parts including
 semiconductors, for a water-repellent film for ink jet printer heads or
 for a water and oil proof coat for filters.
 This polymer has been used alone, but some attempts have been made to
 impart new functions by incorporating various additives, modifiers, etc.
 However, the polymer having a fluorine-containing alicyclic structure has
 no polar group, whereby solubility of various low molecular weight
 compounds therein is low, and it frequently occurs that an additive will
 not be uniformly dissolved or mixed, whereby excellent properties such as
 electrical properties, mechanical properties, surface properties and
 transparency, which the polymer originally has, tend to be impaired.
 It is an object of the present invention to provide a fluorine-containing
 resin composition having a new function imparted without impairing
 excellent properties such as electrical properties, mechanical properties,
 surface properties and transparency, of the polymer having a
 fluorine-containing alicyclic structure.
 The present invention provides a fluorine-containing resin composition
 comprising at least one fluorine-containing polycyclic compound (A)
 selected from the group consisting of the following compounds (A1), (A2)
 and (A3), and a polymer (B) having a fluorine-containing alicyclic
 structure:
 (A1) a fluorine-containing non-condensed polycyclic compound having at
 least two fluorine-containing rings bonded by a bond containing at least
 one member selected from the group consisting of a triazine ring, an
 oxygen atom, a sulfur atom, a phosphorus atom and a metal atom, each of
 said fluorine-containing rings being a carbon ring or a heterocyclic ring,
 of which some or all of hydrogen atoms are substituted by a fluorine atom
 or a fluorine-containing group;
 (A2) a fluorine-containing non-condensed polycyclic compound having at
 least three fluorine-containing rings bonded directly or by a bond
 containing a carbon atom, each of said fluorine-containing rings being a
 carbon ring or a heterocyclic ring, of which some or all of hydrogen atoms
 are substituted by a fluorine atom or a fluorine-containing group;
 (A3) a fluorine-containing condensed polycyclic compound which is a
 condensed polycyclic compound composed of at least three carbon rings or
 heterocyclic rings, of which some or all of hydrogen atoms are substituted
 by a fluorine atom or a fluorine-containing group.
 In the present invention, the fluorine-containing polycyclic compound
 (hereinafter referred to as the compound (A)) may be one member selected
 from the group consisting of the above compounds (A1), (A2) and (A3) or
 may be a combination of at least two members selected from the same group.
 The compound (A) is preferably a compound having a structure wherein a
 hydrogen atom in a C-H bond in the compound is substituted by a fluorine
 atom or a fluorine-containing group, more preferably a compound having a
 structure wherein all hydrogen atoms in the compound are substituted by
 fluorine atoms or fluorine-containing groups. Unless the purpose of the
 present invention is not impaired, part of fluorine atoms in the compound
 (A) may be substituted by one or two chlorine or bromine atoms. The number
 average molecular weight of the compound (A) is preferably from
 3.times.10.sup.2 to 2.times.10.sup.3, more preferably from
 3.times.10.sup.2 to 1.times.10.sup.3.
 With a view to increasing compatibility with the polymer (B) having a
 fluorine-containing alicyclic structure (hereinafter referred to as the
 polymer (B)), the compound (A) contains a fluorine-containing group.
 In the present invention, the fluorine-containing ring is a carbon ring or
 a heterocyclic ring, of which some or all of hydrogen atoms are
 substituted by a fluorine atom or a fluorine-containing group, and it is a
 ring other than a condensed ring. The carbon ring and the heterocyclic
 ring are preferably selected from at least 4-membered rings, and they are
 more preferably 4- to 6-membered rings. The atoms constituting the
 heterocyclic ring are preferably selected from a carbon atom, a nitrogen
 atom, an oxygen atom, a sulfur atom and a phosphorus atom.
 The carbon ring may, for example, be a cyclic saturated hydrocarbon ring
 such as a cyclopentane ring or a cyclohexane ring; an. aromatic
 hydrocarbon ring such as a benzene ring or a ring having one or two
 hydrogen atoms in a benzene ring substituted by a methyl group; or a
 cyclic unsaturated hydrocarbon ring other than an aromatic hydrocarbon
 ring, such as a cyclopentene ring or a cyclohexene ring.
 The heterocyclic ring may, for example, be a heterocyclic ring containing
 one type of a hetero atom, such as a thiophene ring, a furan ring, a
 pyridine ring, a triazine ring or a triazole ring, or a heterocyclic ring
 containing two types of hetero atoms such as an isothiazole ring.
 A preferred fluorine-containing ring is a fluorine-containing aromatic
 hydrocarbon ring, and a more preferred fluorine-containing ring is a
 perfluoroaromatic hydrocarbon ring. As the aromatic hydrocarbon ring, a
 benzene ring is preferred.
 In the present invention, the fluorine-containing non-condensed polycyclic
 compound is a compound wherein two or more fluorine-containing rings are
 bonded without co-owning two or more atoms. Here, the term "bonded without
 co-owning two or more atoms" means that the fluorine-containing rings are
 bonded with one atom co-owned by them, or the fluorine-containing rings
 are directly bonded or indirectly bonded. Here, the term "the
 fluorine-containing rings are indirectly bonded" means that the
 fluorine-containing rings are bonded via at least one atom.
 In a case where two fluorine-containing rings are bonded, such a bond is a
 bond containing at least one member selected from the group consisting of
 a triazine ring, oxygen, sulfur, phosphorus and metal. In a case where
 three or more fluorine-containing rings are bonded, such a bond is a bond
 containing at least one member selected from the group consisting of a
 triazine ring, oxygen, sulfur, phosphorus and metal, direct bonding of
 three or more fluorine-containing rings, or a bond containing carbon.
 The metal atom is preferably a bivalent to tetravalent metal atom selected
 from the group consisting of Zn, Sn, Pb, Ge, Si, Ti, Hg, Cl, As, Se Te and
 Cd. A more preferred metal is Sn, since it presents a fluorine-containing
 non-condensed polycyclic compound having good thermal stability and
 chemical stability.
 As a fluorine-containing non-condensed polycyclic compound having at least
 two fluorine-containing rings bonded by a bond containing a triazine ring,
 a fluorine-containing aromatic triazine compound of the following formula
 1, 2 or 3, is preferred. In this specification, .PHI..sup.g (wherein g is
 an integer of from 1 to 6) represents a residue having g fluorine atoms
 removed from perfluorobenzene. In a case where fluorine atoms still remain
 after removing g fluorine atoms, it may have a structure having some or
 all of such fluorine atoms substituted by a fluorine-containing group.
 The fluorine-containing group in the compound (b) is preferably a
 C.sub.1-20 perfluorohydrocarbon group such as a C.sub.1-20 perfluoroalkyl
 group.
 As a fluorine-containing non-condensed polycyclic compound having at least
 two fluorine-containing rings bonded by a bond containing a sulfur atom, a
 fluorine-containing aromatic sulfur-containing compound of the following
 formula 4 or 5 is preferred.
 As a fluorine-containing non-condensed polycyclic compound having at least
 two fluorine-containing rings bonded by a bond containing a phosphorus
 atom, a compound represented by (.PHI..sup.1).sub.3 -P or a compound
 having rings bonded by a bond containing a phosphazatriene ring,
 represented by the following formula 6, is preferred.
 As a fluorine-containing non-condensed polycyclic compound having at least
 two fluorine-containing rings bonded by a bond containing a metal atom, a
 fluorine-containing aromatic metal-containing compound of the following
 formula 7 or 8, is preferred.
 As a fluorine-containing non-condensed polycyclic compound having at least
 three fluorine-containing rings bonded directly or by a bond containing
 carbon, a fluorine-containing aromatic compound of the following formula
 9, 10, 11 or 12 is preferred. With a view to not impairing the
 transparency of the fluorine-containing resin composition, the total
 number of .PHI..sup.1 to .PHI..sup.4 is preferably from 3 to 5 in the
 fluorine-containing aromatic compound of the formula 9, 10, 11 or 12.
 ##STR1##
 F--(--.PHI..sup.2 --S--).sub.h --.PHI..sup.1 (wherein h is an integer of
 from 1 to 4.) 4
EQU .PHI..sup.k (--S--.PHI..sup.1).sub.k (wherein k is an integer of from 1 to
 6.) 5

##STR3##
 In a fluorine-containing condensed polycyclic compound which is a condensed
 polycyclic compound composed of at least three carbon rings or
 heterocyclic rings, wherein some or all of hydrogen atoms are substituted
 by a fluorine atom or a fluorine-containing group, the carbon rings and
 the heterocyclic rings are preferably at least 4-membered rings, more
 preferably from 4- to 6-membered rings. Preferred atoms constituting such
 heterocyclic rings are selected from a carbon atom, a nitrogen atom, an
 oxygen atom, a sulfur atom and a phosphorus atom.
 The fluorine-containing condensed polycyclic compound is preferably a
 fluorine-containing condensed polycyclic hydrocarbon composed of three or
 four carbon rings, such as perfluorofluorene, perfluorophenalene,
 perfluorophenanthrene, perfluoroanthracene, perfluorotriphenylene,
 perfluoropyrene, perfluorochrysene or perfluoronaphthacene, or a
 fluorine-containing condensed polycyclic compound of the following formula
 13 or 14.
 ##STR4##
 With a view to not impairing the transparency of the fluorine-containing
 resin composition, a fluorine-containing condensed polycyclic hydrocarbon
 composed of three carbon rings, such as perfluorofluorene,
 perfluorophenalene, perfluorophenanthrene or prefluoroanthracene, is more
 preferred.
 The compound (A) is preferably selected from those having an ultraviolet
 ray absorbing property, thermal stability and high compatibility with the
 polymer (B) having a fluorine-containing alicyclic structure and those
 which do not impair the transparency of the fluorine-containing resin
 composition.
 As such a compound (A), particularly preferred is a fluorine-containing
 non-condensed polycyclic compound having at least two fluorine-containing
 rings bonded by a bond containing at least a triazine ring. The triazine
 ring may be a 1,2,3-triazine ring, a 1,2,4-triazine ring or a
 1,3,5-triazine ring and is preferably a 1,3,5-triazine ring.
 The polymer (B) is preferably one obtained by polymerizing a monomer having
 a fluorine-containing alicyclic structure, or a polymer having a
 fluorine-containing alicyclic structure in its main chain, which is
 obtainable by cyclic polymerization of a fluorine-containing monomer
 having at least two polymerizable double bonds. Here, the term "having a
 fluorine-containing alicyclic structure in its main chain" means that the
 polymer has a structure in which at least one of carbon atoms constituting
 the alicyclic group is the carbon atom in the carbon chain constituting
 the main chain, and a fluorine atom or a fluorine-containing group is
 bonded at least to some of the carbon atoms constituting the alicyclic
 ring. The fluorine-containing alicyclic structure is preferably a
 fluorine-containing aliphatic ether ring structure.
 The fluorine-containing group in the compound (A) is preferably a
 C.sub.1-20 perfluorohydrocarbon group such as a C.sub.1-20 perfluoroalkyl
 group.
 The number average molecular weight of the polymer (B) is preferably from
 1.times.10.sup.4 to 5.times.10.sup.6, more preferably from
 5.times.10.sup.4 to 1.times.10.sup.6. If the molecular weight is too
 small, the mechanical properties are likely to be impaired, and if it is
 too large, the compatibility with the compound (A) is likely to
 deteriorate, such being undesirable.
 The polymer having a fluorine-containing alicyclic structure in its main
 chain, which is obtainable by polymerizing a monomer having a
 fluorine-containing alicyclic structure, is well known, for example, from
 JP-B-63-18964. Namely, a polymer having a fluorine-containing alicyclic
 structure in its main chain, can be obtained by homopolymerization of a
 monomer having a fluorine-containing alicyclic structure such as
 perfluoro(2,2-dimethyl-1,3-dioxole), or copolymerizing such a monomer with
 a radical-polymerizable monomer such as tetrafluoroethylene,
 trichlorofluoroethylene or perfluoro(methyl vinyl ether).
 Further, a polymer having a fluorine-containing alicyclic structure in its
 main chain, which is obtainable by cyclic polymerization of a
 fluorine-containing monomer having at least two polymerizable double
 bonds, is known, for example, from JP-A-63-238111 or JP-A-63-238115.
 Namely, a polymer having a fluorine-containing alicyclic structure in its
 main chain, can be obtained by cyclic polymerization of a monomer such as
 perfluoro(allyl vinyl ether) or perfluoro(butenyl vinyl ether) or by
 copolymerizing such a monomer with a radical polymerizable monomer such as
 tetrafluoroethylene, chlorotrifluoroethylene or perfluoro(methyl vinyl
 ether).
 Further, the polymer having a fluorine-containing alicyclic structure in
 its main chain, may also be obtained by copolymerizing a monomer having a
 fluorine-containing alicyclic structure such as
 perfluoro(2,2-dimethyl-1,3-dioxole) with a fluorine-containing monomer
 having at least two polymerizable double bonds, such as perfluoro(allyl
 vinyl ether) or perfluoro(butenyl vinyl ether).
 The polymer having a fluorine-containing alicyclic structure is preferably
 one containing at least 20 mol %, particularly preferably at least 40 mol
 %, of polymer units having a fluorine-containing alicyclic structure,
 based on the total polymer units in the polymer having a
 fluorine-containing alicyclic structure, from the viewpoint of the
 transparency, mechanical properties, etc.
 The polymer having a fluorine-containing alicyclic structure may be those
 having repeating units represented by any one of the following formulae 15
 to 18 as specific examples.
 ##STR5##
 In the formulae 15 to 18, h is an integer of from 0 to 5, i is an integer
 of from 0 to 4, j is 0 or 1, h+i+j is from 1 to 6, s is an integer of from
 0 to 5, t is an integer of from 0 to 4, u is 0 or 1, s+t+u is from 1 to 6,
 each of p, q and r which are independent of one another, is an integer of
 from 0 to 5, p+q+r is from 1 to 6, each of R.sup.1 to R.sup.6 which are
 independent of one another, is a fluorine atom, a chlorine atom or a
 trifluoromethyl group.
 The monomer having a fluorine-containing alicyclic structure is preferably
 a monomer selected from the compounds of the following formulae 19 to 21.
 ##STR6##
 In the formulae 19 to 21, each of R.sup.7 to R.sup.18 which are independent
 of one another, is a fluorine atom, a chlorine atom or a trifluoromethyl
 group, or each pair of R.sup.9 and R.sup.10, R.sup.13 and R.sup.14, and
 R.sup.17 and R.sup.18, may together form a bivalent group selected from
 the group consisting of --(CF.sub.2).sub.4 --, --(CF.sub.2).sub.3 --,
 --(CF.sub.2).sub.2 --, --CF.sub.2 --O--CF.sub.2 --, --(CF.sub.2).sub.2
 --O--CF.sub.2 --, --O--(CF.sub.2).sub.2 -- and --O--(CF.sub.2).sub.3 --.
 Specific examples of the compounds of the formulae 19 to 21 include
 compounds of the following formulae 22 to 29:
 ##STR7##
 As the fluorine-containing monomer having at least two polymerizable double
 bonds, compounds of the following formulae 30 to 32, are preferred.
EQU CY.sup.1 Y.sup.2.dbd.CY.sup.3 OCY.sup.4 Y.sup.5 CY.sup.6 Y.sup.7
 CY.sup.8.dbd.CY.sup.9 Y.sup.10 30
EQU CZ.sup.1 Z.sup.2.dbd.CZ.sup.3 OCZ.sup.4 Z.sup.5 CZ.sup.6.dbd.CZ.sup.7
 Z.sup.8 31
EQU CW.sup.1 W.sup.2.dbd.CW.sup.3 OCW.sup.4 W.sup.5 OCW.sup.6.dbd.CW.sup.7
 W.sup.8 32
 In the formulae 30 to 32, each of Y.sup.1 to Y.sup.10, Z.sup.1 to Z.sup.8
 and W.sup.1 to W.sup.8, which are independent of one another, is a
 fluorine atom, a chlorine atom or a trifluoromethyl group.
 Specific examples of the compounds of the formulae 30 to 32, include the
 following compounds:
EQU CF.sub.2.dbd.CFOCF.sub.2 CF.sub.2 CF.dbd.CF.sub.2
EQU CF.sub.2.dbd.CFOCFl.sub.2 CF.sub.2 CF.dbd.CF.sub.2
EQU CF.sub.2.dbd.CFOCF.sub.2 CF.sub.2 CCl.dbd.CF.sub.2
EQU CF.sub.2.dbd.CFOCF.sub.2 CFClCF.dbd.CF.sub.2
EQU CF.sub.2.dbd.CFOCF.sub.2 CF.sub.2 CF.dbd.CFCl
EQU CF.sub.2.dbd.CFOCF.sub.2 CF(CF.sub.3)CF.dbd.CF.sub.2
EQU CF.sub.2.dbd.CFOCF.sub.2 CF(CF.sub.3)CCl.dbd.CF.sub.2
EQU CF.sub.2.dbd.CFOCF.sub.2 CF.dbd.CF.sub.2
EQU CF.sub.2.dbd.CFOCF(CF.sub.3)CF.dbd.CF.sub.2
EQU CF.sub.2.dbd.CFOC(CF.sub.3).sub.2 CF.dbd.CF.sub.2
EQU CF.sub.2.dbd.CFOCF.sub.2 OCF.dbd.CF.sub.2
EQU CF.sub.2.dbd.CClOCF.sub.2 OCCl.dbd.CF.sub.2
EQU CF.sub.3.dbd.CFOCCl.sub.2 OCF.dbd.CF.sub.2
EQU CF.sub.3.dbd.CFOC(CF.sub.3).sub.2 OCF.dbd.CF.sub.3
 The compound (A) in the present invention has good solubility in the
 polymer (B), and its saturated solubility is from 5 to 20 wt %. With
 respect to the solubility parameter (SP value) as an index for the
 solubility, the compound (b) has a solubility parameter of from 8 to 10
 (cal/cm.sup.3).sup.1/2 which is close to the solubility parameter of from
 6 to 7 (cal/cm.sup.3).sup.1/2 of the polymer (a). This is believed to be
 attributable to the excellent solubility.
 In a case where the content of the compound (b) in the polymer (B) is lower
 than the above saturated solubility, the transparency of the
 fluorine-containing resin composition of the present invention will be
 excellent, and there will be little light scattering caused by microscopic
 phase separation or by crystallites of the compound (A). Accordingly, for
 example, the visible light (wavelength: 400 to 700 nm) transmittance of a
 film having a thickness of from 100 .mu.m to 10 .mu.m will be at least
 90%.
 The fluorine-containing resin composition of the present invention absorbs
 ultraviolet rays having wavelengths of at most 300 nm. Accordingly, it is
 used not only for various ultraviolet ray shielding films, but also for
 forming micropatterns utilizing laser abrasion by an excimer laser such as
 KrF or ArF. As an application example of micropatterns, formation of a
 protective film or an interlayer insulation film for a semiconductor in
 the process for producing semiconductor elements, may be mentioned.
 Further, it may be used for forming an ink discharge outlet in the form of
 a water repellent film for a head of an ink jet printer.
 The proportion of the compound (A) to the polymer (B) may be varied
 depending upon the particular application of the fluorine-containing resin
 composition of the present invention. However, the proportion of the
 compound (A) is usually from 0.01 to 50 parts by weight per 100 parts by
 weight of the polymer (B).
 In order to maintain the transparency of the fluorine-containing resin
 composition, the proportion of the compound (A) is preferably from 0.01 to
 20 parts by weight per 100 parts by weight of the polymer (B). In a case
 where the fluorine-containing resin composition is used for the purpose of
 absorbing ultraviolet rays, the proportion of the compound (A) is
 preferably from 0.01 to 10 parts by weight per 100 parts by weight of the
 polymer (B).
 As a method for preparing the fluorine-containing resin composition of the
 present invention, there may, for example, be employed a method wherein
 the polymer (B) and the compound (A) are charged in a closed container and
 heated to the melting temperature of the polymer (B) to dissolve and
 disperse them to obtain a uniform composition, or a method wherein, using
 a common solvent to dissolve the two materials, they are uniformly mixed
 in a solution state.
 The solvent may, for example, be a polyfluoroaromatic hydrocarbon compound
 such as perfluorobenzene or bis(trifluoromethyl)benzene, a
 polyfluorotrialkylamine compound such as perfluorotributylamine or
 perfluorotripropylamine, a polyfluoroalkane compound such as
 perfluorohexane, perfluorooctane, (perfluoro-n-octyl)ethane or
 perfluoro(2,3,5-trimethylhexane), a polyfluoroolefin compound such as
 (perfluoro-n-octyl)ethylene, a polyfluorocycloalkane compound such as
 perfluorocyclohexane or perfluorodecalin, a polyfluorocyclic ether
 compound such as perfluoro(2-butyltetrahydrofuran), a
 hydrochlorofluorocarbon such as 1,3-dichloro-1,1,2,2,3-pentafluoropropane
 or 3,3-dichloro-1,1,1,2,2-pentafluoropropane, or a fluorine-containing low
 molecular weight polyether. These solvents may be used alone or in
 combination as a mixture.

Now, the present invention will be described in further detail with
 reference to Examples. Examples 1 and 2 are Examples for preparing the
 polymer (a), Examples 3 to 8 are Working Examples of the present
 invention, and Example 9 is a Reference Example. In these Example, "parts"
 means "parts by weight".
 EXAMPLE 1
 750 g of perfluoro(butenyl vinyl ether), 4 kg of deionized water, 260 g of
 methanol and 3.7 g of ((CH.sub.2).sub.2 CHOCOO).sub.2 were put into a
 flask having an internal capacity of 5 lit. After substituting the
 interior of the system by nitrogen, suspension polymerization was carried
 out at 40.degree. C. for 22 hours. As a result, 690 g of a polymer having
 a number average molecular weight of about 5.times.10.sup.4 (hereinafter
 referred to as polymer A) was obtained.
 The intrinsic viscosity [.eta.] of polymer A was 0.3 at 30.degree. C. in
 perfluoro(2 -butyltetrahydrofuran) [PBTHF]. The glass transition point of
 polymer A was 108.degree. C., and it was a transparent glass-like polymer
 which was tough at room temperature. Further, it had a refractive index of
 1.342 and a SP value of 6.6 (cal/cm.sup.3).sup.1/2.
 EXAMPLE 2
 Perfluoro(2,2-diemthyl-1,3-dioxole) and tetrafluoroethylene were subjected
 to radical polymerization in a weight ratio of 80:20 using PBTHF as 10 the
 solvent, to obtain a polymer having a glass transition point of
 160.degree. C. and a number average molecular weight of about
 1.7.times.10.sup.5 (hereinafter referred to as polymer B). Polymer B was
 colorless and transparent and had a refractive index of 1.305 and a SP
 value of 6.3 (cal/cm.sup.3).sup.1/2.
 EXAMPLE 3
 9 Parts of polymer A and 1 part of tetra(perfluorophenyl) tin were
 dissolved in PBTHF to obtain a fluorine-containing resin composition which
 was a solution having a solid content concentration of 12 wt %. This
 solution was cast on a glass plate and dried at 180.degree. C. to obtain a
 film having a thickness of 10 .mu.m. The light transmittance of this film
 was measured and found to be at least 90% for visible light rays of from
 350 to 700 nm. Thus, this fluorine-containing resin composition was found
 to be a uniform composition free from light scattering attributable to
 phase separation.
 The content of perfluorotetraphenyl tin in this film was 6.7 wt %, and the
 refractive index of this film was 1.357. Further, as shown in FIG. 1, this
 film was found to have excellent ultraviolet ray absorbing properties as
 it shows absorption for lights in the wavelength range of ultraviolet rays
 with the absorption peaks being at 220 nm and 265 nm.
 EXAMPLE 4
 9 Parts of polymer A and 1 part of perfluorotriphenylphosphine were
 dissolved in PBTHF to obtain a fluorine-containing resin composition which
 was a solution having a solid content concentration of 12 wt %. This
 solution was cast on a glass plate and dried to obtain a film having a
 thickness of 10 .mu.m. The light transmittance of this film was measured
 and found to be at least 90% for visible light rays of from 350 to 700 nm.
 Thus, this fluorine-containing resin composition was found to be a uniform
 composition free from light scattering attributable to phase separation.
 The content of perfluorotriphenylphosphine in this film was 9.6 wt %, and
 the refractive index of this film was 1.366. Further, as shown in FIG. 2,
 this film was found to have excellent ultraviolet ray absorbing
 properties, as it shows absorption of lights in the wavelength range of
 from 210 nm to 280 nm.
 EXAMPLE 5
 9 Parts of polymer A and 1 part of
 1,4-bis(perfluorophenylthio)tetrafluorobenzene were dissolved in PBTHF to
 obtain a fluorine-containing resin composition which was a solution having
 a solid content concentration of 12 wt %. This solution was cast on a
 glass plate and dried to obtain a film having a thickness of 10 .mu.m. The
 light transmittance of this film was measured and found to be at least 90%
 for visible light rays of from 350 to 700 nm. Thus, this
 fluorine-containing resin composition was found to be a uniform
 composition free from light scattering attributable to phase separation.
 The content of 1,4-bis(perfluorophenylthio)tetrafluorobenzene in this film
 was 5.7 wt %, and the refractive index of this film was 1.357. Further, as
 shown in FIG. 3, this film was found to have excellent ultraviolet ray
 absorbing properties, as it shows absorption of lights in the wavelength
 range of from 210 nm to 300 nm.
 EXAMPLE 6
 9 Parts of polymer A and 1 part of tris(perfluorophenyl)-1,3,5-triazine
 were dissolved in PBTHF to obtain a fluorine-containing resin composition
 which was a solution having a solid content concentration of 12 wt %. This
 solution was cast on a glass plate and dried to obtain a film having a
 thickness of 10 .mu.m. The light transmittance of this film was measured
 and found to be at least 90% for visible light rays of from 350 to 700 nm.
 Thus, this fluorine-containing resin composition was found to be a uniform
 composition free from light scattering attributable to phase separation.
 The content of tris(perfluorophenyl)-1,3,5-triazine in this film was 6.0 wt
 %, and the refractive index of this film was 1.358. Further, as shown in
 FIG. 4, this film was found to have excellent ultraviolet ray absorbing
 properties, as it shows absorption of lights in the wavelength range of
 from 210 nm to 300 nm.
 EXAMPLE 7
 9 Parts of polymer A and 1 part of perfluoro(p-terphenyl) were dissolved in
 PBTHF to obtain a fluorine-containing resin composition which was a
 solution having a solid content concentration of 12 wt %. This solution
 was cast on a glass plate and dried to obtain a film having a thickness of
 10 .mu.m. The light transmittance of this film was measured and found to
 be at least 90% for visible light rays of from 350 to 700 nm. Thus, this
 fluorine-containing resin composition was found to be a uniform
 composition free from light scattering attributable to phase separation.
 The content of perfluoro(p-terphenylene) in this film was 6.9 wt %, and the
 refractive index of this film was 1.357. Further, this film was found to
 have excellent ultraviolet ray absorbing properties, as it shows
 absorption of lights in the wavelength range of from 210 nm to 280 nm.
 EXAMPLE 8
 9 Parts of polymer B and 1 part of tris(perfluorophenyl)1,3,5-triazine were
 dissolved in PBTHF to obtain a fluorine-containing resin composition which
 was a solution having a solid content concentration of 12 wt %. This
 solution was cast on a glass plate and dried to obtain a film having a
 thickness of 10 .mu.m. The light transmittance of this film was measured
 and found to be at least 90% for visible light rays of from 350 to 700 nm.
 Thus, this fluorine-containing resin composition was a uniform composition
 free from light scattering attributable to phase separation.
 The content of tris(perfluorophenyl)1,3,5-triazine in this film was 6.2 wt
 %, and the refractive index of this film was 1.347. Further, this film was
 found to have excellent ultraviolet ray absorbing properties, as it shows
 absorption of lights in the wavelength range of from 210 nm to 320 nm.
 EXAMPLE 9
 Using the solution prepared in Example 8, a thin film having a thickness of
 3 .mu.m was formed on a silicon wafer by spin coating. Then, through a
 mask, exposure was carried out by an excimer laser of 248 nm, whereby it
 was possible to carry out patterning with an exposure of 0.8 J/cm.sup.3.
 In the fluorine-containing resin composition of the present invention, the
 fluorine-containing polycyclic compound is uniformly dissolved without
 turbidity in the polymer having a fluorine-containing alicyclic structure,
 and the composition is useful not only for ultraviolet ray shielding films
 but also for forming a protective film or an interlayer insulation film
 for a semiconductor in the process for producing semiconductor elements,
 or for forming an ink discharge outlet in the form of a water repellent
 film for a head of an ink jet printer.