JP2001187833A - Fluoropolymer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluoropolymer composition having a possible melt flow with almost the same heat resistance and chemical resistance as those of the fluoropolymer, while having improved adhesion to a different material. SOLUTION: The fluoropolymer composition having the melt processing properties comprises a little amount of the fluoropolymer resin with a functional group and a liquid crystal polymer resin, and a great amount of the fluoropolymer resin without a functional group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention is in the field of melt processable fluoropolymers and more particularly to melt processable fluoropolymer compositions having improved properties.

[0002]

This application claims the benefit of application Ser. No. 60/058286 filed Sep. 9, 1997.

[0003] Fluoropolymer resins, especially perfluoropolymer resins, are known for their low surface energy and anti-stick properties, as well as heat and chemical resistance.
These copolymers do not adhere to other materials, especially dissimilar materials, to any practical degree of bond strength.

Some high temperature resistant thermoplastics (HTRP), such as polyamideimides, polyarylene sulfides, polyether sulfones, have been used as adhesion promoters in fluoropolymer coating formulations. See, for example, US Pat. Nos. 5,230,961 (Tannenbaum) and 5,093,403 (Rau et al.). Liquid crystal polymers (LCP) are included in the HTRP group for other purposes, but are not known as adhesion promoters. Although LCP can exhibit some adhesion to metals in the neat (undiluted) state, such adhesion is far below that of the recognized HTRP adhesion promoter.

[0005]

There is a need for a melt-flowable fluoropolymer that has improved adhesion to dissimilar materials while maintaining substantially the heat and chemical resistance of the fluoropolymer.

[0006]

SUMMARY OF THE INVENTION The present invention provides a melt-processable fluoropolymer composition comprising a small amount of a functionalized fluoropolymer and a liquid crystal polymer and a large amount of a non-functionalized fluoropolymer. Since the composition exhibits improved inter-dependent adhesion to metals and the adhesion can be achieved using a relatively low concentration of liquid crystal polymer, the composition is characterized primarily by fluoropolymers. Have. Previously, liquid crystal polymers were not known as adhesion promoters.

In yet another embodiment, the present invention provides a laminate of a metal and a melt processable composition of the present invention adhered thereto.

[0008]

DETAILED DESCRIPTION OF THE INVENTION It has been found that the combination of a functionalized fluoropolymer and a liquid crystal polymer (LCP) increases the adhesion of the resulting fluoropolymer to metal in an interdependent manner. When both components are present, the adhesion results are better than the adhesion results expected when only one of these components is present, as shown below, for the neat LCP. As a result, the composition has a relatively high proportion of fluoropolymer, and thus has the predominantly fluoropolymer characteristics, since good adhesion can be achieved using relatively low concentrations of LCP.

As used herein, "functionalized fluoropolymer" means a fluoropolymer having a side chain functional group or a functional group attached to a side chain. Usually, such functional unit is at the end of the pendant side chain, but need not be. In the context of the present invention,
Functional groups are those that improve the effect of the LCP as an adhesion promoter when both the functional group and the LCP are present in the fluoropolymer composition, to achieve adhesion between the fluoropolymer composition and the metal surface, e.g., It is a group that can form a laminate. Such functional groups can be introduced, for example, by incorporating monomer units having such functional groups, ie, functional monomers, into the fluoropolymer during polymerization.

[0010] Functional groups that can improve the effectiveness of LCP as an adhesion promoter include esters, alcohols, acids (including carbonic, sulfuric, and phosphoric acids), and salts, and their halides. Other functional groups include
Cyanates, carbamates, nitriles and the like are included.
-SO ₂ F, the specific functional group that can be used -
CN, -COOH, and -CH ₂ -Z are included, wherein -Z is -OH, -OCN, -O- (CO) -NH 2,
Or -OP (O) (OH) ₂ . Preferred functional groups include -SO ₂ F and -CH ₂ -Z, wherein -Z is -OH, -O- (CO) -NH ₂ or -OP,
(O) (OH) ₂ . -Z is -OH, -O- (C
A functional group —CH ₂ —Z to be O) —NH ₂ or —OP (O) (OH) ₂ is particularly preferred. As will be appreciated by those skilled in the art, there can be multiple types of functional groups. However, usually a single type of functional group is used.

The concentration of the functional group in the component of the fluoropolymer resin of the melt-processable fluoropolymer composition of the present invention, that is, the functionalized fluoropolymer to which the functional group-free fluoropolymer is added, is determined by the LCP adhesion promoter To improve good adhesion to metals at low LCP concentrations. As will be appreciated by those skilled in the art, the concentration of functional groups effective to improve the effectiveness of the LCP as an adhesion promoter can vary at least depending on the type of functional group and the type of LCP. The concentration of functional groups present can be expressed relative to the number of main chain carbon atoms in the fluoropolymer resin. Generally, the concentration of functional groups present will be at least about 25/10 ⁶ backbone carbon atoms, based on the total number of fluoropolymers in the composition. The concentration of functional groups is usually in the range of 25 to 2500 per 10 ⁶ main chain carbon atoms, preferably 50 to 2000 per 10 ⁶ main chain carbon atoms, based on the total number of fluoropolymers present. Range.

Those skilled in the art will appreciate that the desired concentration of functional groups in a functionalized fluoropolymer resin may be a single functionalized fluoropolymer or a mixture of such fluoropolymers having the same or different functional groups. It will be seen that this can be achieved. However, only 1
A single fluoropolymer having only two types of functional groups is typically used. Similarly, the non-functional fluoropolymer component of the composition can be a blend of the non-functional fluoropolymer.

Thus, in the present invention, the melt-processable fluoropolymer composition comprises a small amount of a functionalized fluoropolymer and a liquid crystal polymer resin, and a large amount of a nonfunctionalized fluoropolymer. "Large" refers to fluoropolymers without functional groups, fluoropolymers with functional groups,
And the total weight of LCP means at least 50% by weight, preferably 70% by weight, of the non-functional fluoropolymer. The composition comprises from 1 to 30% by weight of the functionalized fluoropolymer, more preferably from 1 to 20% by weight, based on the total weight of the non-functionalized fluoropolymer, the functionalized fluoropolymer and the LCP. It is preferably 3 to 15% by weight, and the LCP is preferably 0.5 to 15% by weight, more preferably 1 to 10% by weight. The content of such LCP is generally lower than the content of this HTRP in compositions where other HTRP is present for promoting adhesion. The concentration of functional groups in the functionalized fluoropolymer alone will be higher than that described above for all fluoropolymers, depending on the amount of non-functional fluoropolymer present in the blend.

Fluoropolymer resins which can be used are perfluoroolefins having 3 to 8 carbon atoms and perfluoro (alkyl vinyl ethers) whose straight-chain or branched alkyl group contains 1 to 5 carbon atoms. (P
AVE), and a copolymer of TFE having one or more copolymerized monomers selected from AVE). Preferred perfluoropolymers include copolymers of TFE having at least one of hexafluoropropylene (HFP) and PAVE. Preferred comonomers include those in which the alkyl group contains 1 to 3 carbon atoms, especially 2 to 3 carbon atoms.
AVE, ie perfluoro (ethyl vinyl ether)
(PEVE) and perfluoro (propyl vinyl ether) (PPVE). Still other fluoropolymers that can be used include copolymers of ethylene with TFE that optionally include one or more modified comonomers such as perfluorobutylethylene. Representative fluoropolymers are, for example, ASTM Standard
Specification D-2116, D-3159, and D
-3307. Such fluoropolymers are non-functional fluoropolymers when they have essentially no functional groups, but are functionalized fluoropolymers when functional groups are added by, for example, grafting. It is. Preferred fluoropolymers are
Except for the functional unit, that is, the functional group, it is a perfluoropolymer. Alternatively or additionally, preferred fluoropolymers are non-elastomers symmetric to elastomers.

[0015] Functionalized fluoropolymers include those described in the preceding paragraph and also those containing copolymerized units derived from a functional monomer. However, if the concentration of the functional monomer is sufficiently high in the TFE copolymer, no other comonomer is required. Usually, the functional groups introduced by such monomers are at the end of the pendant side chain, but need not be. Functional monomers that introduce pendant side chains with such functionality can have the general formula CY ₂ = CY-Z, where Y is H or F and Z contains a functional group. Preferably, each Y is F, -Z is -R _f -X, wherein R _f
Is a fluorinated diradical, and X is a functional group that can include a CH ₂ group. It is preferred that R _f is a linear or branched perfluoroalkoxy having 2 to 20 carbon atoms, so that the functional comonomer is a fluorinated vinyl ether. Examples of such fluorovinyl ethers include CF ₂ = as described in U.S. Patent No. 4982009.
_{CF [OCF 2 CF (CF 3} )] m -O- (CF 2) n
—CH ₂ OH and the alcohol ester CF ₂ ［CF [OCF ₂ CF described in US Pat. No. 5,310,838.
_{(CF 3)] m -O- (} CF 2) n - (CH 2) p -O
-COR. Additional fluorovinyl ethers include
CF ₂ ＣＦCF [O described in US Pat. No. 4,138,426.
CF ₂ CF (CF ₃ )] _m O (CF ₂ ) _n COOH and its carboxyl ester CF ₂ ＣＦCF [OCF ₂
CF (CF ₃ )] _m O (CF ₂ ) _n COOR. In these chemical formulas, m = 0-3, n = 1-4, p
= 1-2 and R is methyl or ethyl. Preferred such fluorovinyl ethers include CF _{2
= CF-O-CF 2 CF} 2 -SO 2 F, and -Y -
CF ₂ ＣＦCF as SO ₂ F, —CN or —COOH
_{[OCF 2 CF (CF 3)} ] O (CF 2) 2 -Y, and a -Z -OH, -OCN, -O- (CO ) -NH 2
Or CF ₂ = CF [O to be -OP (O) (OH) _{2
CF 2 CF (CF 3)]} O (CF 2) include ₂ -CH ₂ -Z. These fluorovinyl ethers are preferred because they can be incorporated into the polymer and the functionality can be incorporated into the resulting copolymer.

X is -OCN (cyanate), -O- (C
O) -NH ₂ (carbamate) or -OP (O) (O
H) ₂ (phosphonate) Chemical formula CF ₂ ＣＦCF-R
_f - (CH ₂₎ a compound having a _n -X, can be synthesized as follows. In the cyanate, n is 1 to 3, R
General formula CF ₂ ＝ CF— wherein _f is a perfluoroalkyl or perfluoroalkoxy containing 1 to 20 carbon atoms
The known compound having R _f- (CH ₂ ) _n -OH (I) is converted to cyanogen bromide (CNBr) in the presence of a non-nucleophilic base.
Alternatively, it can be prepared in high yield by a one-step process of reacting with chlorocyanide (CNCl). Carbamates can be prepared from cyanates by contacting the cyanate with an acid at an elevated temperature for a time sufficient to complete the conversion of the cyanate to the carbamate. Compounds containing phosphorus can be prepared by converting compound (I) to either P (O) Cl ₃ or P (O) Cl ₃ in neat or aprotic solvents.
(O) Br ₃ to react with, for example, CF ₂ ＣＦCF—R _f −
A chloride or bromide such as (CH ₂ ) _n -OP (O) (Cl ₂ ) is obtained and then hydrolyzed to give the acid -OP (O)-
It can be prepared in high yields by the process of obtaining (OH) ₂ . For the preparation of these compounds see EP-A-0 829 471 and PCT patent application publication WO 98/11114.

When the functionalized fluoropolymer is achieved by copolymerization, the functionalized fluoropolymer of the present invention, even if the functionalized fluoropolymer is a blend containing a non-functionalized fluoropolymer, can be used in the functionalized fluoropolymer of the present invention. The amount of functional monomer is small to achieve the desired functional group concentration. In general, the amount of functional monomer is at most 10% by weight, preferably 5% by weight, based on the total weight of the functionalized fluoropolymer, ie the components of the fluoropolymer comprising the functional monomer. In some examples, to achieve good bonding to a substrate metal such as stainless steel, or where it is not desirable to use non-functional monomers in a functionalized melt processable fluoropolymer, Higher concentrations of functional monomers, reaching and even greater than wt%, may be desirable. Although the functionalized fluoropolymer can be uniform, the concentration of the functional monomer need not be uniform throughout the functionalized fluoropolymer.

[0018] The fluoropolymer composition of the present invention is melt processable. Therefore, this composition generally has
It has a melt viscosity (MV) in the range of 50 × 10 ³ Pa · s, but viscosities outside this range can also be used. MV
Is measured according to ASTM D-1238 at a temperature suitable for the predominant fluoropolymer component of the composition.
MV is preferably in the range of 1 to 25 × 10 ³ Pa · s. Typically, the MV of each fluoropolymer component is within the aforementioned range, but as will be appreciated by those skilled in the art, blending will result in the smaller component having a wider range of MVs.

As is well known in the art, liquid crystal polymers (LCPs), also called thermotropic LCPs, are characterized by their unique ability to form regions of high molecular order in the melt. This orientation can be carried over to the solid state, and this orientation is improved by appropriate processing techniques that introduce shear or elongational stresses on the LCP during partial processing.
"Thermotropic LCP" or equivalent "LCP" herein is the TCP described in U.S. Pat. No. 4,075,262.
When tested by the OT test, means a polymer that transmits light through the crossed polarizers described in this test procedure and is therefore believed to form an anisotropic melt. Any thermotropic LCP can be used in the melt processable fluoropolymer composition of the present invention. Suitable LCPs are described, for example, in US Pat.
No. 13, 3991014, 4011199, 404
8148, 4075262, 4083829, 4
118372, 412070, 4130545
Nos. 4,153,779, 4,159,365, 41,614
No. 70, 4169933, 4184996, 418
9549, 4219461, 4232143, 4
No. 232144, No. 4245082, No. 4256624
No. 4269965, No. 4272625, 43704
Nos. 66, 4383105, 4447592, 452
2974, 4617369, 4664972, 4
684712, 4727129, 4727131
No. 4,728,714, No. 4749769, No. 47629
07, 4778927, 4816555, 484
No. 9499, No. 4851496, No. 4851497, 4
857626, 4864013, 4868278
Nos. 4,882,410, 4,923,947, 49994
No. 16, 5015721, 5015722, 502
5082, 5086158, 5102935, 5
Nos. 110896 and 5143956 and European Patent Application 356226. Effective LCPs include polyester, poly (ester amide),
Poly (ester imide) and polyazomethine are included.
Preferred thermotropic LCPs are polyesters or poly (ester amides), and it is particularly preferred that the polyesters or poly (ester amides) are partially or completely aromatic. Examples of commercially available LCPs include Zenite ^™ (DuPont), Vectra®
(Hoechst), and aromatic polyesters or poly (ester amides) sold under the trademarks Xydar® (Amoco).

The melt-processable fluoropolymer composition of the present invention can have various forms. These are melt-compounded using conventional designs of melt-processing equipment suitably equipped to process fluoropolymers at the melting temperature, such as twin-rotor mixers or extruders with good mixing capabilities. It can be a mixed composition. The composition can be a powder blend, or a dispersed or slurry blend.

The fluoropolymer composition can be processed to form a laminate or to prepare the fluoropolymer component of the laminate by means well known in the art appropriate to the physical form of the composition. Thus, for example, if the composition is a powder, the composition may be extruded, injection molded, or deposited by powder coating techniques such as rotary lining or electrostatic spraying, and if the composition is dispersed, It can be applied by wet coating techniques, such as roll coating or spraying, followed by drying and fusing.

Since LCP is not known as an adhesion promoter, the melt-processable fluoropolymer composition of the present invention comprises:
It exhibits surprisingly good adhesion to metals at low LCP concentrations. Good adhesion is at least 700 g / c, as measured by the peel test for aluminum described below.
m, preferably at least 1000 g / cm peel strength. Thus, the composition is effective in a laminate as both a primer and as the only fluoropolymer component. The metal surface can be rough or smooth. The following examples show that the melt processable compositions of the present invention can adhere to smooth metal surfaces. As is well known to those skilled in the art, the adhesion of the coating to the metal can be improved by roughening the metal surface, for example by sandblasting. In general,
The metal surface shall be free of dust and grease.

[0023]

EXAMPLE A laboratory twin rotor mixer (Rheomix® 300) having a roller type rotor, controlled and driven by a torque rheometer controlled by a Haake Rheocord® 40 microprocessor.
The compositions were prepared for testing in laminates by melt compounding the fluoropolymer resin and the additives in Haake Buechler). All components of the composition were packed together in the mixing chamber. Temperature and rotor speed were controlled by adjustments in the microprocessor. The product removed from the mixer after melt blending is relatively large and may be cut into small pieces suitable for molding or, optionally, ground to a powder prior to molding.
The amount of each component in the composition is expressed in% by weight based on the total weight of the aforementioned components synthesized.

Unless otherwise stated, the following examples illustrate the invention using TFE / PPVE copolymers containing functional monomers. Such functionalized fluoropolymers are generally described by Gresham and Vogelpohl (U.S. Pat.
No. 635926) by aqueous dispersion polymerization using ethane as a chain transfer agent. However, the functional monomer is included in the initial charge to the reactor,
No buffer was used. The functional monomers utilized are defined in Table 1. Functionalized fluoropolymer solids are:
Separated from the raw dispersion by mechanical shear coagulation by adding a water immiscible solvent, followed by filtration,
Let dry. The composition of the functionalized fluoropolymer is:
Determined by Fourier transform infrared spectroscopy.

[0025]

TABLE 1 Identification code identification or description EVE-OH CF ₂ = CF- functional monomers _{[OCF 2 CF (CF 3)} ] - OCF 2 CF 2 -CH 2 -OH 9,9- dihydro-9 hydroxy - perfluoro _{(3,6-di-oxa-5-methyl-1-nonane) EVE-P CF 2 = CF-} [OCF 2 CF (CF 3)] - OCF 2 CF 2 -CH 2 -OP ( O) (OH) ₂ 9- phosphonic acid-9,9-dihydro - perfluoro (3,6-di-oxa-5-methyl-1-nonane) EVE-carbamate _{CF 2 = CF- [OCF 2 CF} (CF 3 _{)] - O-CF 2 CF} 2 -CH 2 -O- (CO) -NH 2 9- carbamate-9,9-dihydro - perfluoro (3,6 - dioxa-5-methyl-1-nonane), especially Unless otherwise stated, the compositions prepared in the examples below were prepared using the functionalized TFE-P used in the supplied cubic form.
Including PVE copolymer (PFA) (Teflon®
PFA Fluoropolymer resin Grade 340, DuPo
nt). The peel strength, described below, for this resin alone, measured against aluminum, is 185-345.
g / cm.

Unless otherwise stated, the LCP used in this composition is a crystalline polyester, Zenite ™ liquid crystal polymer resin grade 7000 (DuPont).

Samples were prepared for peel strength testing as follows unless otherwise noted. A 0.060 inch (1.5 mm) thick, 8 inch (20.3 cm) square steel plate was used as the basis for lamination. 6 inches (1
A 0.040 inch (1.0 mm) thick, 8 inch square chase with a 5.2 cm square opening was placed on the steel plate. Cover the chase with a 0.005 inch (0.13 mm) thick, 8 inch square aluminum sheet obtained from the manufacturer (AJ Oster Co.) and obtain a 0.002 inch (0.05 mm) thick polyimide sheet. A 2.5 inch (6.4 cm) wide strip of film (Kapton®, DuPont Co.) was stripped from one edge of aluminum so that it overlapped the chase opening by about 0.5 inch (1.3 cm). Position along the part. Then
About 65 g of the test resin composition is placed within the outline of the chase opening on the aluminum foil. The resin is covered with another sheet of aluminum and then with another steel sheet. The structure is then compressed in a platen press at a temperature and pressure appropriate for the fluoropolymer used. After removal from the press, the laminate is placed between heavy steel plates at room temperature until cool, and then cut into 1 inch (2.5 cm) wide strips.

The peel strength values reported herein were determined as follows. The layers of the laminated strip are separated with a polyimide release film and secured with the jaws of an Instron® tensile tester. The moving jaw is 1 inch / minute (2.5
cm / min) to release the layers and hold the free end of the stack at an angle of 180 ° with the jaw line.
The average force to peel the strip during the 30 second to 100 second pull time interval is recorded and reported as the force per unit width of the strip.

Example 1 and Controls The compositions summarized in Table 1 were prepared as described above. Fluoropolymer with a functional group utilized (Fc _n -FP-1)
Are 3.2% by weight PPVE and 8.1% by weight EV
It contains E-OH and has an MV of 1.8 × 10 ³ Pa · s. Lamination of the composition and aluminum sheet was also prepared as above, and the peel strength was also measured as above. Table 2
The results shown in Table 3 show that the functionalized fluoropolymer and L
Compositions containing both CPs show surprisingly high adhesion. The peel strength shown in Example 1 was 1072.
50% higher than in the case of neat LCP determined to be g / cm.

[0030]

[Table 2]

Example 2 and Control This example illustrates the invention for a composition comprising a fluoropolymer without functional groups other than PFA. Non-functional fluoropolymers are available from ASTM D-211.
6 Type I (Teflon® FEP fluoropolymer resin grade 100, DuPont), TFE /
It is an HFP copolymer (FEP). The functionalized fluoropolymer (Fcn-FP-2) contains 3.6% by weight of P
5. containing PVE and 3.1% by weight of EVE-OH;
It has an MV of 8 × 10 ³ Pa · s. Table 3 shows the composition and the results. This data shows that compositions containing both functionalized fluoropolymers and LCPs are more adhesive, that different fluoropolymers can be used in the compositions of the present invention, and that functionalized fluoropolymers Does not need to be of the same type as the non-functional fluoropolymer.

[0032]

[Table 3]

Examples 3-4 and Controls These examples illustrate the present invention for functionalized fluoropolymers containing different functional monomers (EVE-P and EVE-carbamate). The functionalized fluoropolymer Fcn-FP-3 contains 4.3% by weight of PPVE and 0.66% by weight of EVE-P and has a MV of 1.5 × 10 ³ Pa · s. The functionalized fluoropolymer Fcn-FP-4 contains 6.7% by weight of PEVE (not PPVE) and 1.1% by weight.
1.6 × 10 ³ Pa ·
s of MV. Table 4 shows the composition and the results. As this data shows, compositions containing both functionalized fluoropolymers and LCPs have higher adhesion.

[0034]

[Table 4]

Examples 5-6 and Controls These examples illustrate the invention for compositions containing different LCP resins (Zenite ^™ liquid crystal polymer resin grades 1000 and 6000, DuPont). Grade 6000 is less crystalline than Grade 7000 and has a lower heat distortion temperature of 20 ° C. than Grade 7000,
Grade 1000 is an amorphous LCP. The fluoropolymer without a functional group is the FEP resin used in Example 2, and the fluoropolymer with a functional group is Fcn-F
P-2 (Example 2). The composition and results are shown in Table 5. Compositions containing both functionalized fluoropolymers and LCP resins have higher adhesion, indicating that a variety of LCP resins can be used in the compositions of the present invention.

[0036]

[Table 5]

Examples 7-8 and Controls These examples demonstrate that the test metal used was Type 3 having a thickness of 0.002 inches (0.051 mm) instead of aluminum.
21 stainless steel (SS) foil (PTP-512, Lyon I
ndustries) are used to illustrate the invention.
This foil was clean when obtained from the manufacturer,
Washed with acetone and dried. The functionalized fluoropolymer (Fcn-FP-5) contains 4.3% by weight of PP
VE and 1.6% by weight EVE-OH,
It has an MV of × 10 ³ Pa · s. Table 6 shows the composition and the results. This data shows that compositions containing both functionalized fluoropolymers and LCP (Zenite ^™ 7000) have high adhesion to SS.

[0038]

[Table 6]

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F100 AB01B AK17A AL05A AS00A BA02 JB16A JK06 YY00A 4J002 BD151 BD152 BD161 CC153 CF003 CL083 CM043 GF00

Claims (7)

[Claims] 1. A melt-processable fluoropolymer composition comprising a small amount of a functionalized fluoropolymer resin and a liquid crystal polymer resin, and a large amount of a nonfunctionalized fluoropolymer resin. 2. The functional group of the functionalized fluoropolymer is -SO ₂ F, wherein -Z is -OH, -O- (CO) -NH ₂ , or -OP (O) (OH) _2. and the composition of claim 1, wherein the -CH ₂ -Z is at least one of. 3. The composition according to claim 2, wherein the functional group is —CH ₂ —OH. 4. The method according to claim 1, wherein the functional group is —CH ₂ —O— (CO) —.
_3. The composition according to claim 2, wherein the composition is NH2. 5. The method according to claim 1, wherein the functional group is —CH ₂ —OP (O) (O
_3. The composition according to claim 2, wherein the composition is H) ₂ . 6. The liquid crystal polymer resin is present in an amount of 0.5 to 15% by weight based on the total weight of the liquid crystal polymer resin, the functional group-containing fluoropolymer resin, and the non-functional group-containing fluoropolymer resin. The composition according to claim 1, wherein 7. A laminate comprising a metal and the melt-processable fluoropolymer composition of claim 1 adhered thereto.