JP2000026688A - Resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition to be uniformly compatibilized and not to cause undesirable phenomena to a molding equipment by compounding a fluororesin, an inorganic additive, and a fluorine-containing organopolysiloxane compound. SOLUTION: A resin composition contains a fluororesin, a reforcing agent such as glass fiber and the like, 0.01-50 wt.% of an inorganic filler such as molybdenium disulfide or an inorganic pigment such as titanium oxide, and 0.001-10 wt.% of a fluorine-containing organopolysiloxane having a fluorine- containing organic group bonded to a silicon atom. As the fluororesin, use is made of an ethylene tetrafluoride-ethylene copolymer, an ethylene tetrafluoride-propylene hexafluoricde copolymer, a perfluoride copolymer, a perfluoroalkoxyethylene-ethylene tetrafluoride copolymer or the like. The fluorine-containing organopolysiloxane compound is represented by the formula and has a fluorine content of 15-90 wt.% and a mol.wt. 103-106. In the formula, Rf is a polyfluoroalkyl group, Q is a 1-8C alkylene group and the like; q>0; r>1; 5<=q+r<=1400 and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resin composition containing a fluororesin and a fluorinated organopolysiloxane compound having a fluorinated organic group bonded to a silicon atom. The resin composition of the present invention is a resin composition having thermal stability in heat molding and capable of uniform molding.

[0002]

2. Description of the Related Art Conventionally, tetrafluoroethylene (4
Fluorinated resins such as homopolymers of (fluoroethylene) or copolymers of tetrafluoroethylene and other polymerizable compounds have a high fluorine content, and have a high physical or thermal resistance and chemical resistance. Because of its excellent chemical properties,
It is used for various applications.

[0003] The fluororesin is mainly used as a heat-resistant material or a chemical-resistant material for various devices and members.
When a fluororesin is used, usually, a fluororesin composition containing various additives (for example, an inorganic filler such as glass fiber, an inorganic pigment, and the like) in the fluororesin is used. Prepared and molded at high temperature.

[0004]

The temperature for molding a fluororesin is high, for example, 350 to 400 ° C. for melt molding. Under such high temperatures,
A part of the fluororesin may be thermally decomposed by heating to generate fluorine gas, hydrogen fluoride and the like. The gas has a problem of discoloring or altering inorganic additives such as pigments contained in the fluororesin composition. Further, a molded article obtained from a fluororesin composition containing an inorganic filler has a problem that desired physical properties cannot be obtained.

In order to solve this problem, a fluorine-free polydimethylsiloxane compound is blended with a fluorine resin composition containing a fluorine resin and an inorganic additive to prevent generation of fluorine gas, hydrogen fluoride and the like. Also, proposals have been made to improve the thermal stability. However, due to the low compatibility between the polydimethylsiloxane compound and the fluororesin, the composition of a molded article obtained by molding the composition becomes non-uniform, the surface shape becomes rough, and an extruder used for molding is used. Problems such as the attachment of tar-like substances were observed.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been developed as a resin composition containing a fluororesin and an inorganic filler, and a resin composition having a uniform compatibility and a molding composition. Provided is a resin composition which does not cause an adverse phenomenon to an apparatus, and the resin composition has high thermal stability even at a high temperature as a molded product, and a molded product having a smooth surface shape of the obtained molded product. I will provide a.

That is, the present invention provides a resin composition comprising a fluororesin, an inorganic additive, and a fluorinated organopolysiloxane compound having a fluorinated organic group bonded to a silicon atom, and the resin composition. A molded article obtained by molding an article is provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The fluororesin in the present invention is
A polymer of a fluoroolefin, a copolymer of a fluoroolefin and a monomer copolymerizable with the fluoroolefin, a polymer of a compound having both a fluorine-containing group and a vinyl group,
Alternatively, it refers to a copolymer of a compound having both a fluorine-containing group and a vinyl group and a monomer copolymerizable therewith.

As the fluoroolefin, vinyl fluoride, vinylidene fluoride, dichlorodifluoroethylene,
Trifluorochloroethylene, tetrafluoroethylene and hexafluoropropylene are preferred. As the compound having both a fluorine-containing group and a vinyl group, an ester of acrylic acid or methacrylic acid with a fluorinated alcohol compound is preferable.

The fluororesin of the present invention includes a homopolymer of a fluoroolefin, a copolymer obtained by copolymerizing two or more fluoroolefins, and a copolymer of a fluoroolefin and a monomer copolymerizable with the fluoroolefin. preferable. Particularly as a fluororesin, tetrafluoroethylene-
An ethylene copolymer, a tetrafluoroethylene-6-fluoropropylene copolymer, or a perfluoro (alkoxyethylene) -4fluoroethylene is preferable.

As the fluororesin in the present invention, the above-mentioned fluororesin may be used as it is, or may be used as a blend polymer obtained by blending a fluororesin with another resin. The fluororesin and the blend polymer are known resins, and commercially available products can be obtained.

As the inorganic additive in the present invention, an inorganic filler or an inorganic pigment to be added to the fluororesin is preferable, and a reinforcing agent such as glass fiber or carbon fiber, or an inorganic filler such as molybdenum disulfide, carbon fiber or inorganic whisker is used. Materials or inorganic pigments are preferred. The content of the inorganic filler is 0.0
1 to 50% by weight is preferred.

When an inorganic pigment is contained in the composition of the present invention, an inorganic pigment is preferred as the inorganic additive because the pigment has good color development and has the advantage of uniform color development. As inorganic pigments, titanium oxide, antimony trioxide white, cobalt oxide blue, bismuth oxide, silicate-coated graphite, silicate-coated molybdate orange, silicate-coated iron oxide, cadmium red, cadmium orange, cadmium yellow, ultramarine, Preferable examples include cobalt and violet. The amount of the inorganic pigment is preferably 0.01 to 50% by weight based on the fluororesin.

The fluorine-containing organopolysiloxane compound having a fluorine-containing organic group bonded to a silicon atom in the present invention is an organopolysiloxane having a basic skeleton of an organosiloxane unit having an organic group bonded to a silicon atom of a siloxane unit. A compound in which at least one of the organic groups bonded to the silicon atom of the organosiloxane unit is a fluorinated organic group.

As the fluorinated organic group, a fluoroalkyl group in which at least one hydrogen atom of an alkyl group is substituted by a fluorine atom is preferable, and a polyalkyl group in which two or more hydrogen atoms of an alkyl group are substituted by a fluorine atom is preferred. A fluoroalkyl group or a group having the polyfluoroalkyl group as a partial structure is preferred. In the following, a polyfluoroalkyl group is referred to as an ^Rf group.

The carbon number of the R ^f group is preferably about 1 to 18, particularly preferably 1 to 12, and more preferably 6 to 12. The R ^f group may have a linear structure or a branched structure, and preferably has a linear structure. R ^f fluorine atomic ratio in the group, i.e., (R ^f number of fluorine atoms in the group) / (number of hydrogen atoms of the same alkyl group having a carbon number corresponding to ^the R ^f group) × 1
00 (%) is preferably at least 60%, particularly preferably at least 80%.

Further, the fluorine-containing organic group is preferably a group having an ^Rf group as a partial structure, and particularly preferably a group represented by the following formula (1).

R ^f -Q- (1) wherein R ^f represents an R ^f group in which a fluorine atom is bonded to a carbon atom bonded to Q. R ^f is preferably a perfluoroalkyl group in which substantially all of the hydrogen atoms of the alkyl group have been replaced with fluorine atoms. Incidentally, a perfluoroalkyl group described as R ^F group below.

The R ^F group may have a straight-chain structure or a branched structure, and preferably has a straight-chain structure. In the case of a branched structure, it is preferable that the branched portion is a short chain having about 1 to 3 carbon atoms. Also, R ^F groups in the fluorine-containing organopolysiloxane compound may be present two or more different groups of carbon number.

R ^f in Formula 1 is preferably an R ^F group, particularly CF
₃ (CF) _k- (where k is 1 to 18, 2 to 1
6 is preferable, and especially 4-13 is preferable. R ^F group is preferably linear represented by). Specific examples of the ^RF group include, but are not limited to, the following groups. In addition, in the following examples, it is assumed that structurally isomeric groups which are groups having the same molecular formula and different structures are included.

CF_Three CF_Two -, C_Three F₇ − [CF_Three (C
F_Two )_Two −, And (CF_Three )_Two CF-
No. ], C_Four F₉ − [CF_Three (CF_Two )_Three −, (CF
_Three )_Two CFCF_Two −, (CF_Three )_Three C-, CF_Three CF_Two 
CF (CF_Three )-], C_Five F ₁₁− [CF_Three (CF
_Two )_Four −, (CF_Three )_Two CF (CF_Two )_Two −, (CF
_Three )_ThreeCCF_Two -, CF_Three CF_Two CF (CF_Three ) CF_Two 
-, Etc.], C₆ F₁₃− [CF_Three (C
F_Two )_Two C (CF_Three )_Two -Such as a group of structural isomerism],
C₈ F₁₇-, C_TenF_{twenty one}-, C₁₂F_{twenty five}-, C_FifteenF₃₁-, H
C_t F_2t-(Where t is an integer of 1 to 18),
(CF_Three )_Two CFC_s F_2s− (Where s is 1 to 15
It is an integer. )etc.

In the present invention, the fluorinated organopolysiloxane compound contains one or more kinds of fluorinated organic groups. When two or more kinds of fluorinated organic groups are present, a compound having a different number of carbon atoms in the ^RF group is used. It is preferable to use two or more types.

Q in the formula (1) represents a divalent linking group, preferably an alkylene group having 1 to 8 carbon atoms, particularly preferably an alkylene group having 1 to 5 carbon atoms. The alkylene group may be any of a linear alkylene group or a branched alkylene group, and is preferably a linear alkylene group. Certain cases are preferred. Q is _{- (CH 2) 2 -,} -
(CH ₂ ) ₃ — or — (CH ₂ ) ₄ — is preferred,
In particular - (CH _{2) 3} - is preferable.

Specific examples of the group represented by the formula (1) include
The following groups may be mentioned, but not limited thereto. CF _{3
(CF 2) 5 CH 2 CH} 2 CH 2 -, CF 3 (CF 2)
₆ CH ₂ CH ₂ CH ₂ —, CF ₃ (CF ₂ ) ₇ CH ₂ C
_{H 2 CH 2 -, CF 3} (CF 2) 7 CH 2 CH 2 CH 2
CH ₂ —, (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH ₂
CH ₂ —, (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂
CH ₂ —, CF ₃ (CF ₂ ) ₅ CH ₂ C (CH ₃ ) HC
H ₂ —, CF ₃ (CF ₂ ) ₆ CH ₂ C (CH ₃ ) HCH
_{2 -, CF 3 (CF 2} ) 7 CH 2 C (CH 3) HCH 2
_{-, CF 3 (CF 2)} 7 CH 2 CH 2 CH (CH 3)
-.

Among the organosiloxane units in the fluorinated organopolysiloxane compound, the organosiloxane unit having a fluorinated organic group bonded to a silicon atom (hereinafter referred to as a fluorinated siloxane unit) includes:
R (R ^f -Q-) SiO _2/2 units, (R) ₂ (R ^f -Q
-) SiO _1/2 units, (R ^f -Q-) SiO _3/2 units, and the like. Here, R represents a monovalent hydrocarbon group, an alkyl group having 1 to 3 carbon atoms, C ₆ H ₅ —, or C _6
6 H ₅ CH ₂ CH ₂ - it is preferred, and a methyl group is particularly preferable. When two or more R, R ^f , or Q are present in the same molecule, they may be the same or different.

The fluorinated organopolysiloxane compound may contain an organosiloxane unit other than the above fluorinated siloxane unit (hereinafter referred to as a non-fluorinated siloxane unit). Non-fluorinated siloxane units include (R) ₃ SiO _1/2 units and (R) ₂ S
iO _2/2 units and RSiO _3/2 units. Here, R represents a monovalent hydrocarbon group, and particularly has 1 to 1 carbon atoms.
3 alkyl groups, C ₆ H ₅ —, or C ₆ H ₅ CH ₂ C
H ₂ — is preferred, and a methyl group is more preferred. When two or more Rs are present in the same molecule, they may be the same or different.

The fluorinated organopolysiloxane compound in the present invention preferably comprises a fluorinated siloxane unit and a non-fluorinated siloxane unit. The ratio of the fluorinated siloxane unit to the total number of siloxane units in the fluorinated organopolysiloxane compound is preferably 5 to 50%. Further, the fluorinated organopolysiloxane compound preferably has a structure in which organosiloxane units are linearly or branched, and particularly preferably a structure in which linearly branched.

As the fluorinated organopolysiloxane compound in the present invention, a compound represented by the average composition formula 1 is preferable. (R) _a (R ^f -Q-) _b SiO
_{(4-ab) / 2} ... Average composition formula 1, wherein R ^f and Q in the average composition formula 1 have the same meanings as in the formula (1), and a, b, and R have the following meanings. Show. a: 0 or a positive number less than 4. b: a positive number less than 4, and 0 <a + b ≦ 4. R: a monovalent organic group. R is preferably a monovalent hydrocarbon group, particularly an alkyl group having 1 to 3 carbon atoms, C ₆ H ₅ —, or C ₆ H ₅ CH ₂ CH _2.
Is preferable, and a methyl group is more preferable.

As the fluorinated organopolysiloxane compound represented by the average composition formula 1, a compound represented by the fluorinated organopolysiloxane compound represented by the formula 3 is preferable. _{(R) 3 SiO · [Si} (R) 2 O] q · [Si (-QR f) (R) O] r · Si (R) 3 ·· formula 3

However, in the formula 3, R ⁶ has the same meaning as described above, and is preferably a methyl group. q represents an integer of 0 or more, and r represents an integer of 1 or more. The structure of the compound represented by Formula 3 may be any of a block polymer in which siloxane units having the same structure are connected in a block shape, and a random polymer in which siloxane units having the same structure are connected in a random shape. And The same applies to the following description of polysiloxane.

The fluorinated organopolysiloxane compound in the present invention is a known compound and can be synthesized by a known production method such as hydrosilylation. The fluorinated organopolysiloxane compound of the present invention is usually preferably oily, and has a molecular weight of 10 ³ to 1.
0 is preferably in the range of ^6, especially 5 × 10 ³ to 15
It is preferable that it is × 10 ³ .

The number of siloxane units in the fluorine-containing organopolysiloxane compound represented by the formula (3) is usually preferably 5 ≦ q + r ≦ 1400, particularly preferably 20 ≦ q + r ≦ 1400.
q + r ≦ 400 is preferred. Furthermore, when various expectation derived from a fluorine atom is desired, the content of the fluorine atom in the fluorine-containing organopolysiloxane compound is 15 to 90% by weight.
, And particularly preferably 15 to 70% by weight.

Specific examples of the fluorine-containing organopolysiloxane compound represented by the formula 3 include the following compounds. Here, q and r in the following formula have the same meanings as in Formula 3, and t indicates that they are a mixture of integers of 3 to 15. (CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₂ (CF ₂ )
₃ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ )
[(CH ₂ ) ₃ (CF ₂ ) ₃ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ )
₂ O] _q Si (CH ₃ ) [(CH ₂ ) ₂ (CF ₂ ) ₅ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO
[Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₃ (CF ₂ ) ₅ CF ₃ ]} _r Si (CH ₃ ) ₃ ,
(CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₂ (CF ₂ ) ₇ CF ₃ ]} _r S
i (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₃ (CF
₂ ) ₇ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ )
[(CH ₂ ) ₃ (CF ₂ ) ₈ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ )
₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₃ (CF ₂ ) ₈ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ Si
O ・ [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₂ (CF ₂ ) ₉ CF ₃ ]} _r Si (CH ₃ )
₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₃ (CF ₂ ) ₉ C
F ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH
₂ ) ₂ (CF ₂ ) ₁₁ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {S
i (CH ₃ ) [(CH ₂ ) ₃ (CF ₂ ) ₁₁ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO ・ [Si
(CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₂ (CF ₂ ) ₁₃ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH
₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₃ (CF ₂ ) ₁₃ CF ₃ ]} _r Si
(CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₂ (CF ₂ )
₁₅ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ )
[(CH ₂ ) ₃ (CF ₂ ) ₁₅ CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ SiO • [Si (CH ₃ )
₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₃ (CF ₂ ) _t CF ₃ ]} _r Si (CH ₃ ) ₃ , (CH ₃ ) ₃ Si
O • [Si (CH ₃ ) ₂ O] _q {Si (CH ₃ ) [(CH ₂ ) ₃ (CF ₂ ) _t CF ₃ ]} _r Si (CH ₃ )
₃ .

In the formula, m independently represents an integer of 0 or more, and n represents an integer of 1 or more.

The content of the fluorinated organosiloxane compound is preferably from 0.001 to 10% by weight, more preferably from 0.1 to 1.0% by weight, based on the fluororesin. The content of the fluorinated organosiloxane compound is 0.001 to 10
When the amount is set to be% by weight, the effects of the present invention can be sufficiently expected, the compatibility between the fluorine-containing organosiloxane compound and the fluororesin is excellent, and there is an advantage that there is no fear of seepage onto the surface of the molded article.

The resin composition of the present invention may contain additives other than those described above. The resin composition of the present invention provides an excellent resin molded article by molding. As a molding method, the above-mentioned fluororesin, the inorganic additive, etc. and the fluorinated organopolysiloxane compound are blended according to a conventional method, mixed, and then usually molded by melt extrusion.
The shape after molding is not particularly limited, and is preferably a pellet or flake. Further, the quantitative ratio of each component contained in the molded pellets or flakes may be a master batch containing a high concentration of an inorganic additive or the like and a fluorine-containing organopolysiloxane compound. The weight ratio in the target molded body in the case of forming a molded body may be the same.

The resin composition formed into pellets or flakes can be further formed into a desired shape.
The resin composition of the present invention contains a fluorine-containing diorganopolysiloxane, so that even when heat-molded at a high temperature of about 250 to 400 ° C., generation of a fluorine-based gas due to decomposition of the fluorine resin is prevented or Sufficiently suppressed, and even if fluorine gas is generated, adverse effects due to it can be prevented. In addition, because the compatibility between the fluororesin and the fluorinated diorganopolysiloxane is good, they mix well when blended, and do not show unevenness or surface roughness of the extruded product,
No tar-like material adheres to the die of the extruder.

The molded article obtained by molding the resin composition of the present invention is not particularly limited, but the molded article is particularly useful as a film or a tube because it has good thermal stability and excellent uniformity.

[0039]

EXAMPLES Reference Example To determine compatibility with a fluororesin, the contact angle with the fluororesin was measured. A small contact angle means good compatibility with the fluororesin. Dimethylpolysiloxane KF9 according to comparative example
6 (manufactured by Shin-Etsu Silicone) and a fluorine-containing diorganopolysiloxane (formula 2) according to the present invention, a tetrafluoroethylene-ethylene copolymer resin (Aflon COP, manufactured by Asahi Glass) or ethylene tetrafluoride-perfluoro The contact angle with respect to an (alkoxyethylene) copolymer resin (Aflon PFA, manufactured by Asahi Glass) was measured. Table 1 shows the results.

[0040]

[Table 1]

Example 1 (Example) 100 parts by weight of Aflon COP, 20 parts by weight of titanium oxide,
A resin composition sufficiently mixed with 0.5 part by weight of a fluorine-containing diorganopolysiloxane represented by the following formula 2 (however, the sequence of the organosiloxane units is random) is extruded at 380 ° C. Cylinder I 35
20m / mΦ with 0 ° C and cylinder II set at 370 ° C
Was extruded into a string by using an extruder, and the strand was pelletized with a pelletizer. The color of the pellet was light brown. The pellet was extruded and formed into a tube. The surface of the obtained tube was uniform and smooth, and no change in color tone was observed. No tar-like substances were observed on the die of the extruder. (CH ₃ ) ₃ SiO. [Si (CH ₃ ) ₂ O] _m {Si (CH ₃ ) [(CH ₂ ) ₃ (CF ₂ ) ₃ CF ₃ ]} _n Si (CH ₃ ) ₃ ... Here, m / n in Expression 2 is 9/1, and m + n is 50.
It is.

Example 2 A resin was prepared by mixing 100 parts by weight of Aflon PFA, 20 parts by weight of bismuth oxide, and 0.5 part by weight of the same fluorinated diorganopolysiloxane as used in Example 1 [formula 2]. The composition was then pelletized in the same manner as in Example 1. The pellet was extruded and formed into a tube. The surface of the obtained tube was uniform and smooth, and no change in color tone was observed. No tar-like substances were observed on the die of the extruder.

Example 3 (Example) 100 parts by weight of a tetrafluoroethylene-6-fluoropropylene copolymer resin (Aflon FEP, manufactured by Asahi Glass), titanium oxide 2
0 parts by weight and 0.5 parts by weight of the same fluorine-containing diorganopolysiloxane [formula 2] used in Example 1 were mixed to obtain a resin composition, and pelletized in the same manner as in Example 1. The pellet was extruded and formed into a tube. The surface of the obtained tube was uniform and smooth, and no change in color tone was observed. No tar-like substances were observed on the die of the extruder.

Example 4 (Comparative Example) 100 parts by weight of Aflon COP, 20 parts by weight of titanium oxide,
Dimethyl polysiloxane (KF96, made by Shin-Etsu Silicon)
0.5 parts by weight was pelletized in the same manner as in Example 1 to obtain a resin composition, and a tube was obtained by extrusion molding of the pellets. However, this tube had irregularities on the inner surface, and the surface was uneven and uneven, and a change in color tone was observed. Adhesion of tar-like substances was observed on the dies of the extruder.

Example 5 (Comparative Example) A resin composition was prepared by pelletizing 100 parts by weight of Aflon PFA, 20 parts by weight of bismuth oxide, and 0.5 part by weight of dimethylpolysiloxane (KF96) in the same manner as in Example 1.
Further, a tube was obtained by extrusion molding. However, this tube had irregularities on the inner surface, had a rough feel on the surface, was rough, and a change in color tone was recognized. Adhesion of tar-like substances was observed on the dies of the extruder.

Example 6 (Comparative Example) Aflon FEP 100 parts by weight, titanium oxide 20 parts by weight,
0.5 parts by weight of dimethylpolysiloxane (KF96)
The resin composition was pelletized in the same manner as in Example 1, and a tube was obtained by extrusion molding. However, this tube had irregularities on the inner surface, the surface was uneven and rough, and a change in color tone was observed. Adhesion of tar-like substances was observed on the dies of the extruder.

[0047]

The resin composition of the present invention is an excellent composition having excellent heat stability and preventing generation of fluorine gas and the like by containing a fluorine-containing organopolysiloxane compound. In addition, since the components have good compatibility, when they are formed into a molded product, the surface shape becomes uniform and smooth, and a high-quality molded product is obtained. Further, there is an advantage that there is no problem that a tar-like substance adheres to a device used for molding during molding. Further, when a pigment is contained, there is an advantage that a molded article can be provided without changing the color tone of the pigment.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J002 BD121 BD131 BD141 BD151 BD161 CP082 DA016 DE096 DE126 DE136 DE186 DG026 DJ006 DK006 DL006 FA036 FD016 FD096

Claims (5)

[Claims] 1. A resin composition comprising a fluororesin, an inorganic additive, and a fluorinated organopolysiloxane compound having a fluorinated organic group bonded to a silicon atom. 2. The content of the fluorine-containing organopolysiloxane compound is 0.001 to 100 parts by weight of the fluororesin.
The resin composition according to claim 1, which is 10 parts by weight. 3. The fluororesin is a tetrafluoroethylene-ethylene copolymer resin, a tetrafluoroethylene-6-fluoropropylene copolymer resin, or a perfluoroalkoxyethylene resin.
3. The resin composition according to claim 1, which is a tetrafluoroethylene copolymer resin. 4. The method according to claim 1, wherein the inorganic additive is an inorganic pigment.
4. The resin composition according to 2 or 3. 5. A molded article obtained by molding the resin composition according to claim 1.