JP2001226494A - Norbornene-based resin film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain, by extrusion molding, a norbornene-based resin film slight in malappearance due to specks or resin dregs and also slight in mechanical strength drop due to resin decomposition and/or low-molecular weight fraction. SOLUTION: This film is obtained by extrusion molding of a norbornene- based resin 80,000-150,000 in weight-average molecular weight determined by high-performance liquid chromatography and 30,000-50,000 in number-average molecular weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a norbornene-based resin film. In this specification, the term “film” does not mean a film in a strict sense based on thickness, but also includes a relatively thick film.

[0002]

2. Description of the Related Art Compared with other resin materials, norbornene-based resins are characterized by high heat resistance, high transparency, low intrinsic birefringence, and low photoelastic modulus. The use as an optical film used for such purposes is being studied. However, there is a problem that melt molding is difficult due to its poor thermal stability.

Accordingly, it has been proposed to use a norbornene-based resin having a relatively high molecular weight and a wide molecular weight distribution (Japanese Patent Publication No. 2977274). By doing so, it gradually solidifies during melt molding such as extrusion molding,
A flat and beautiful molded product with little residual stress can be obtained.

[0004] However, since the above-mentioned resin is made to have a wide molecular weight distribution, the low molecular weight component may be too large, so that a spot-like pattern may be formed on the obtained molded article. When the amount of low molecular weight components is large, volatile components increase, and at the time of extrusion molding, volatilize at the exit of the mold and deposit on the tip of the mold to become grease, die lines are generated, and the appearance of the obtained film And the mechanical strength is reduced.

Further, the above-mentioned resin has a relatively high molecular weight of 100,000 to 2,000,000. Therefore, the melt viscosity of the resin increases, and the fluidity during melting decreases. When the molding temperature is increased in accordance with the melt viscosity of the resin, the resin may be decomposed in some cases, and as a result, the low molecular weight component increases, causing the same problem as described above.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, can be easily formed by extrusion molding, has less appearance defects such as spots, grease, etc. It is an object of the present invention to provide a norbornene-based resin film that causes little decrease in mechanical strength.

[0007]

The norbornene resin film of the present invention is a film obtained by extrusion molding and has a weight average molecular weight of 80,000 to 15 as measured by high performance liquid chromatography.
0000, number average molecular weight of 30,000 to 50,000
0 norbornene resin.

[0008] The "molecular weight" in the present specification is expressed in terms of polystyrene measured by high performance liquid chromatography using tetrahydrofuran as a solvent.

The norbornene-based resin used in the present invention is a polymer containing a norbornene-based monomer as a main component, for example, a hydrogenated product of a ring-opened polymer of a norbornene-based monomer and an addition type of a norbornene-based monomer. Examples thereof include polymers, addition polymers of norbornene monomers and olefins, and modified products of these polymers. These may be used alone or in combination of two or more.

If the molecular weight of the norbornene-based resin is too low, the melt viscosity decreases, the mechanical strength of the resulting film decreases, and post-processing such as paper passing, trimming and cutting becomes difficult. Extrusion molding at a relatively low temperature becomes difficult because the melt viscosity increases, and if the molding temperature is increased to lower the melt viscosity, decomposition of the resin occurs,
The volatile component increases, the resulting film has poor appearance, and the mechanical strength decreases.
Limited to 0000 to 150,000, preferably 8
0000 to 120,000, number average molecular weight of 30,0
00 to 50,000, preferably 40,00
0 to 50,000.

The above norbornene-based resin film contains a phenol-based or phosphorus-based antioxidant in order to improve the heat resistance, ultraviolet resistance, smoothness and the like of the film as long as the effects of the present invention are not impaired; Phenol-based thermal deterioration inhibitor; amine-based antistatic agent; lubricant such as aliphatic alcohol ester and polyhydric alcohol partial ester; benzophenone-based UV absorber, benzotriazole-based UV absorber, acrylonitrile-based UV absorber UV absorbers such as agents; fluorinated nonionic surfactants; and leveling agents such as special acrylic resin-based leveling agents and silicone-based leveling agents.

[0012]

Next, the present invention will be described in detail with reference to examples.

(Examples 1 and 2, Comparative Examples 1 and 2) A norbornene resin having various weight average molecular weights and number average molecular weights shown in Table 1 (manufactured by JSR, trade name "ARTON") at 110 ° C. After drying for 3 hours, a single screw extruder (φ50m
m, L / D = 28), extruded at 275 to 290 ° C., and passed through a sintered fiber type filter having a filtration accuracy of 5 μm. The resin was passed through a T-die (500 mm width, coat hanger type) at 12 kg / hr. Was discharged. Then
The discharged resin is formed into a film shape by a pair of cooling rolls set at 140 ° C., and has a width of 430 mm and a thickness of 5 mm.
A 0 μm norbornene-based resin film was obtained, and the obtained film was subjected to the following evaluation. The results are shown in Table 1.

Evaluation 1) Appearance (spots) The center of the obtained film was 400 mm wide and 25 cm long.
m, and the number of generated spots was visually measured. 2) Appearance (eye oil)

After forming the film continuously for 24 hours under the above conditions, the grease adhering to the tip of the mold was visually observed.

3) Film Strength The obtained film was bent at 180 ° C., and も の was given when the film was bent, and X was given when the film was broken during bending.

[0017]

[Table 1]

[0018]

Since the norbornene-based resin film of the present invention has the above-mentioned structure, it can be easily formed by extrusion, and has few appearance defects such as spots and eye oils. , And a decrease in mechanical strength caused by low molecular weight components.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) B29K 86:00 B29K 86:00 B29L 7:00 B29L 7:00 F Term (Reference) 4F071 AA21 AA39 AA81 AF17 AH19 BB06 BC01 4F207 AA12 AG01 AH73 AR06 AR12 AR20 KA01 KA17 KL84 4J002 BK001 CE001 FD030 FD050 FD060 FD100 FD170 FD310 GP00

Claims (1)

[Claims] 1. A film obtained by extrusion molding, wherein the film has a weight average molecular weight of 80,000 to 150, as measured by high performance liquid chromatography.
A norbornene-based resin film comprising a norbornene-based resin having a number average molecular weight of 30,000 to 50,000.