JP2022144803A - Resin composition, crosslinked resin composition and molded body - Google Patents

Abstract

To provide a composition capable of suppressing blocking of a 4-methyl-1-pentene polymer and suppressing bleeding of a crosslinking auxiliary as a composition comprising a 4-methyl-1-pentene polymer and a crosslinking auxiliary.SOLUTION: There is provided a resin composition (X1) comprising 100 pts.mass of a 4-methyl-1-pentene polymer (A) satisfying the following requirements (A-a) to (A-c) and 0.1 to 50 pts.mass of a crosslinking auxiliary (B): (A-a) the content ratio of a constitutional unit (U1) derived from 4-methyl-1-pentene is 80 to 100 mol% and the content ratio of a constitutional unit (U2) derived from an α-olefin having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene) is 0 to 20 mol% (provided that the total content ratio of the constitutional unit (U1) and the constitutional unit (U2) is defined as 100 mol%); (A-b) the melt flow rare (MFR) under a load of 5 kg at 260°C is in the range of 0.01 to 250 g/10 min; (A-c) the melting point measured by DSC is in the range of 200 to 250°C.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a resin composition, a crosslinked resin composition formed by crosslinking the resin composition, and a molded article containing the crosslinked resin composition.

4-methyl-1-pentene-based polymer (also called polymethylpentene, PMP, etc.) is characterized by excellent stain resistance due to its extremely low surface tension, transparency, and excellent scratch resistance, and Due to its high heat resistance, it is used in various applications.

In relation to this, there is a technique of forming crosslinks in the resin by electron beam irradiation in order to improve the mechanical properties and heat resistance of the polyolefin resin. A 4-methyl-1-pentene-based polymer is a kind of polyolefin-based resin, and since it has side chains, electron beam irradiation causes the formation of crosslinks and the decomposition of the molecular chains at the same time. For this reason, various attempts have been made to improve the physical properties of 4-methyl-1-pentene polymers by electron beam irradiation.

For example, Patent Document 1 discloses an electron beam curable resin composition containing polymethylpentene and a specific cross-linking agent, and a cured product obtained by subjecting this electron beam curable resin composition to electron beam irradiation. is disclosed. Here, Patent Document 1 also describes that the electron beam-curable resin composition has excellent heat resistance and can be used for reflector resin frames, reflectors, and semiconductor light-emitting devices.

Further, Patent Document 2 discloses an attempt to modify the polymethylpentene-based resin by irradiating electron beams on a composite fiber composed of a polymethylpentene-based resin and a thermoplastic resin other than the polymethylpentene-based resin. there is Here, in Patent Document 2, when a polymethylpentene-based resin is hit with an electron beam, the bonds between molecules are cut and radicals are generated. It is also described that it is crosslinked to improve heat resistance and abrasion resistance. Note that Patent Document 2 does not specifically describe that the electron beam irradiation is performed in the presence of a cross-linking aid.

JP 2017-031429 A JP 2019-178442 A

A 4-methyl-1-pentene-based polymer (also referred to herein as a "4-methyl-1-pentene polymer") has side chains. Decomposition proceeds simultaneously. For this reason, it is preferable to add a cross-linking aid that serves as an intermediary for cross-linking in order to efficiently generate cross-links in the decomposing resin.

Triallyl isocyanurate is generally used as a cross-linking aid, but since triallyl isocyanurate is liquid at room temperature, it is difficult to evenly disperse it when adding it to a resin. Also, since it has a low boiling point of 144°C, it has the problem of easily volatilizing and bleeding during resin molding. Further, when preparing a cross-linking composition by blending triallyl isocyanurate as a cross-linking aid with a 4-methyl-1-pentene-based polymer, problems such as blocking may occur.

Therefore, the present invention provides a composition containing a 4-methyl-1-pentene polymer and a cross-linking aid, which can suppress blocking of the 4-methyl-1-pentene polymer and can suppress bleeding of the cross-linking aid. The purpose is to provide goods.

As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved by using a cross-linking aid having a specific structure, and have completed the present invention.

That is, the present invention relates to, for example, the following items [1] to [9].
[1]
A resin composition containing 100 parts by mass of a 4-methyl-1-pentene polymer (A) satisfying the following requirements (Aa) to (Ac) and 0.1 to 50 parts by mass of a cross-linking aid (B) Thing (X1).
(Aa) The content of the structural unit (U1) derived from 4-methyl-1-pentene is 80 to 100 mol%, and the α-olefin having 2 to 20 carbon atoms (4-methyl-1-pentene The content of the structural unit (U2) derived from 0 to 20 mol% [however, (the total content of the structural unit (U1) and the structural unit (U2) is 100 mol%). be.
(Ab) Melt flow rate (MFR) at 260° C. under 5 kg load is in the range of 0.01 to 250 g/10 min.
(Ac) The melting point (Tm) measured by DSC is in the range of 200 to 250°C.

[2]
The resin composition (X1) according to [1], wherein the cross-linking aid (B) contains two or more cyclic structures represented by the following formula (1).

[3]
The resin composition (X1) according to [1] or [2], wherein the cross-linking aid (B) is a triallyl isocyanate prepolymer.

[4]
A crosslinked resin composition (X2) obtained by crosslinking the resin composition (X1) according to any one of [1] to [3].

[5]
A molded article containing the crosslinked resin composition (X2) according to [4].

[6]
The molded article according to [5], which is a release film or release paper.

[7]
A resin composition containing 0.1 to 50 parts by mass of a crosslinking aid (B) for 100 parts by mass of a 4-methyl-1-pentene polymer (A) that satisfies the following requirements (Aa) to (Ac): Thing (X1),
A method for producing a crosslinked resin composition (X2), comprising a step of crosslinking by irradiation.
(Aa) The content of the structural unit (U1) derived from 4-methyl-1-pentene is 80 to 100 mol%, and the α-olefin having 2 to 20 carbon atoms (4-methyl-1-pentene The content of the structural unit (U2) derived from 0 to 20 mol% [however, (the total content of the structural unit (U1) and the structural unit (U2) is 100 mol%). be.
(Ab) Melt flow rate (MFR) at 260° C. under 5 kg load is in the range of 0.01 to 250 g/10 min.
(Ac) The melting point (Tm) measured by DSC is in the range of 200 to 250°C.

[8]
The production method according to [7], wherein the cross-linking aid (B) contains two or more cyclic structures represented by the following formula (1).

[9]
The production method according to [7] or [8], wherein the cross-linking aid (B) is a triallyl isocyanate prepolymer.

The present invention provides, as a composition containing a 4-methyl-1-pentene polymer and a cross-linking aid, a composition capable of suppressing blocking of the 4-methyl-1-pentene polymer and suppressing bleeding of the cross-linking aid. It is possible to provide

Specific embodiments of the present invention will be described in detail below, but the present invention is not limited to the following embodiments at all, and can be carried out with appropriate modifications within the scope of the purpose of the present invention. be able to. In this specification, the terms "polymer" and "(co)polymer" are used to include homopolymers and copolymers, unless otherwise specified.

[Resin composition (X1)]
The resin composition (X1) of the present invention contains 100 parts by mass of a 4-methyl-1-pentene polymer (A) and 0.1 to 50 parts by mass of a cross-linking aid (B).
Each constituent component constituting the resin composition (X1) of the present invention is described below.

<4-methyl-1-pentene polymer (A)>
The resin composition (X1) of the present invention contains a 4-methyl-1-pentene polymer (A).
This 4-methyl-1-pentene polymer (A) satisfies all of the following requirements (Aa) to (Ac).

Requirement (A-a)
The 4-methyl-1-pentene polymer (A) used in the present invention has a content of the structural unit (U1) derived from 4-methyl-1-pentene of 80 to 100 mol% and has 2 carbon atoms. The content of structural units (U2) derived from ~20 α-olefins (excluding 4-methyl-1-pentene) is 0 to 20 mol% [however, (structural unit (U1) and structural unit (U2) The total content of is 100 mol%.).

The content of the structural unit (U1) is preferably 80 to 95 mol%, and the content of the structural unit (U2) is preferably 5 to 20 mol%.
Examples of α-olefins having 2 to 20 carbon atoms that constitute the structural unit (U2) include ethylene, propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1 -tetradecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-eicosene. The olefin can be appropriately selected according to the use and required physical properties of the molded article obtained from the resin composition (X1). For example, the α-olefin is preferably an α-olefin having 8 to 18 carbon atoms from the viewpoint of imparting appropriate elastic modulus, flexibility, and flexibility to the composition (X1), and 1-octene. , 1-decene, 1-tetradecene, 1-hexadecene, 1-heptadecene and 1-octadecene are more preferred.

In the present specification, a structural unit derived from an α-olefin is a structural unit corresponding to an α-olefin, that is, a structural unit represented by —CH ₂ —CHR— (R is a hydrogen atom or an alkyl group). Point. The structural unit (U1) derived from 4-methyl-1-pentene can be interpreted in the same manner, and the structural unit corresponding to 4-methyl-1-pentene (i.e., —CH ₂ —CH(—CH ₂ CH(CH ₃ ) Refers to the structural unit represented by ₂ )-).

The 4-methyl-1-pentene polymer (A) contains structural units other than structural units derived from 4-methyl-1-pentene and structural units derived from the olefin ( hereinafter also referred to as “other structural units”). The content of other structural units is, for example, 0 to 10.0 mol %.

Examples of monomers leading to other structural units include cyclic olefins, aromatic vinyl compounds, conjugated dienes, non-conjugated polyenes, functional vinyl compounds, hydroxyl group-containing olefins, and halogenated olefins. Cyclic olefins, aromatic vinyl compounds, conjugated dienes, non-conjugated polyenes, functional vinyl compounds, hydroxyl group-containing olefins and halogenated olefins include, for example, paragraphs [0035] to [0041] of JP-A-2013-169685. compounds can be used.
When the 4-methyl-1-pentene polymer (A) has other structural units, the other structural units may be contained singly or in combination of two or more.

Requirement (A-b)
The 4-methyl-1-pentene polymer (A) used in the present invention has a melt flow rate (MFR) at 260° C. under a load of 5 kg in the range of 0.01 to 250 g/10 minutes.
Here, the MFR is preferably 5 to 200 g/10 minutes.

Requirements (A-c)
The 4-methyl-1-pentene polymer (A) used in the present invention has a melting point (Tm) measured by DSC in the range of 200 to 250°C.
Here, the Tm is preferably 200 to 235°C.

Method for producing 4-methyl-1-pentene polymer (A) The method for producing the 4-methyl-1-pentene polymer (A) used in the present invention includes the above requirements (Aa) to (Ac). It is not particularly limited as long as a 4-methyl-1-pentene polymer satisfying the conditions is obtained. For example, in the presence of a known catalyst such as a solid titanium catalyst or a metallocene catalyst, 4-methyl-1-pentene and optional The α-olefin having 2 to 20 carbon atoms constituting the structural unit (U2) and the optional monomer leading to the other structural units are (co)used by a method such as a gas phase method, a solution method, a slurry method, etc. including the step of polymerizing.

Here, the solid titanium catalyst may be one commonly used in the field to which the present invention belongs. Solid titanium catalyst components comprising 2,2-dialkyl-1,3-dialkoxypropanes such as ,3-dimethoxypropane are preferred. The 4-methyl-1-pentene polymer (A) is obtained, for example, by using the solid titanium catalyst component instead of the solid titanium catalyst component (I) described in WO 2006/054613 pamphlet, and using the solid titanium Except that the (co)polymerization in the presence of a catalyst component is carried out in the absence of an ether compound, it can be obtained by the same production method as disclosed in WO 2006/054613 pamphlet.

Further, as metallocene catalysts, for example, International Publication No. 2014/050817, International Publication No. 2001/053369, International Publication No. Metallocene catalysts described in Publication No. 2006/025540 or WO2013/099876. The 4-methyl-1-pentene polymer (A) can be obtained by the same production method as disclosed in JP-A-2018-162408, for example, using the metallocene catalyst. For example, 4-methyl-1-pentene polymer (A) is (8-octamethylfluoren-12′-yl-(2-(adamantan-1-yl)-8-methyl-3,3b,4,5 ,6,7,7a,8-octahydrocyclopenta[a]indene)))) in the presence of a metallocene catalyst, including a metallocene compound such as zirconium dichloride, with 4-methyl-1-pentene and said C2-C20 It can be obtained by copolymerizing with an α-olefin. Here, the metallocene catalyst may further contain an organoaluminumoxy compound such as modified methylaluminoxane (MMAO) and/or an alkylaluminum such as triisobutylaluminum. Further, the copolymerization can be carried out in the presence of hydrogen if necessary. In that case, the hydrogen concentration and pressure in the polymerization system are appropriately set in order to adjust the molecular weight of the resulting copolymer. good too.
In addition to those produced as described above, commercially available polymers such as TPX manufactured by Mitsui Chemicals, Inc. may also be used.

<Crosslinking aid (B)>
The cross-linking aid (B) used in the present invention is not particularly limited as long as the objects of the present invention are achieved. However, in a typical aspect of the present invention, the cross-linking aid (B) preferably contains two or more cyclic structures represented by the following formula (1).

Preferred examples of the cross-linking aid (B) include polymers of compounds represented by the following formula (2).

（式（２）中、Ｒ¹～Ｒ³はそれぞれ独立に、アリル基、メタリル基、エステル結合を介したアリル基、及びエステル結合を介したメタリル基のいずれかのアリル系置換基である。）

(In Formula (2), R ¹ to R ³ are each independently an allylic substituent such as an allyl group, a methallyl group, an allyl group via an ester bond, or a methallyl group via an ester bond. )

Here, in one preferred aspect of the present invention, the cross-linking aid (B) is a triallyl isocyanate prepolymer.
The resin composition (X1) of the present invention containing the cross-linking aid (B) has a 4-methyl Blocking of the -1-pentene polymer can be suppressed, and bleeding of the cross-linking aid can also be suppressed.

<Other ingredients>
The resin composition (X1) of the present invention contains the 4-methyl-1-pentene polymer (A) and the cross-linking aid (B). Here, in one of the typical embodiments of the present invention, the resin composition (X1) of the present invention comprises the 4-methyl-1-pentene polymer (A) and the cross-linking aid (B). Become. However, the resin composition (X1) of the present invention contains, in addition to the 4-methyl-1-pentene polymer (A) and the cross-linking aid (B), the 4-methyl-1-pentene polymer (A ) or the cross-linking aid (B) (hereinafter referred to as “other components”).

Examples of "other components" that may be contained in the resin composition (X1) of the present invention include various additives commonly used in the field to which the present invention belongs, examples of which include weather stabilizers and heat stabilizers. agents, antioxidants, ultraviolet absorbers, antistatic agents, anti-slip agents, anti-blocking agents, anti-fog agents, nucleating agents, lubricants, pigments, dyes, anti-aging agents, hydrochloric acid absorbers, inorganic or organic fillers, Examples include organic or inorganic foaming agents, adhesives, softeners, and flame retardants. The content of these components in the resin composition (X1) of the present invention depends on the use of the molded article obtained from the resin composition (X1), but for example, the 4-methyl-1-pentene polymer (A ) It is preferable that the total amount of additives to be blended is 30 parts by mass or less with respect to 100 parts by mass. Further, the total content of these components in the resin composition (X1) of the present invention is 5 parts by mass or less with respect to 100 parts by mass of the 4-methyl-1-pentene polymer (A). preferable.

[Crosslinked resin composition (X2) and its production method]
The crosslinked resin composition (X2) of the present invention is obtained by crosslinking the resin composition (X1).
That is, the crosslinked resin composition (X2) has a structure in which the molecules of the 4-methyl-1-pentene polymer (A) are crosslinked with each other via the crosslinking aid (B).

Such a crosslinked resin composition (X2) can be obtained by crosslinking the resin composition (X1). In a preferred embodiment of the present invention, the crosslinked resin composition (X2) can be obtained by a production method including a step of crosslinking the resin composition (X1) by irradiation.

Here, the radiation that can be used for the radiation irradiation may be any radiation that can crosslink the resin composition (X1), and may be, for example, an electromagnetic wave such as X-rays or γ-rays, or An electron beam may be used. However, in the present invention, the radiation is preferably an electron beam.

Here, the acceleration voltage of the electron beam can be appropriately selected according to the size and shape of the 4-methyl-1-pentene polymer (A) and the molded product. In the case of the molded product, the acceleration voltage is preferably 50 to 400 kV. In addition, the absorption dose during electron beam irradiation can be appropriately set depending on the composition of the resin composition (X1), but is preferably 50 to 800 kGy from the viewpoint of efficient cross-linking. The electron beam source is not particularly limited, and various electron beam accelerators such as Cockroft-Walton type, Vandegraft type, resonance transformer type, insulating core transformer type, linear type, dynamitron type, and high frequency type are used. be able to.

Moreover, the production method of the present invention preferably includes a step of molding the resin composition (X1) by compression molding or another suitable molding method before the radiation irradiation.

[Molded body]
In a typical embodiment of the present invention, the crosslinked resin composition (X2) is used in the form of molded articles. In other words, the molded article of the present invention contains the crosslinked resin composition (X2).

The shape of the molded article of the present invention can be appropriately selected according to its use. For example, it can be in the form of a sheet. Moreover, the molded article of the present invention may be a laminate such as a laminated film.
Although the use of the molded article of the present invention is not particularly limited, examples thereof include a release film and a release paper.

The method for producing the molded article of the present invention is not particularly limited. In one preferred aspect of the present invention, the molded article of the present invention is
(SA-1) a step of molding the resin composition (X1);
(SA-2) It can be obtained by a production method including a step of irradiating the precursor molded body obtained in the step (S-1). In this aspect, the "step of cross-linking the resin composition (X1) by irradiation" described above in the "crosslinked resin composition (X2) and method for producing the same" is performed as the step (S-2). become.

For example, when the molded article of the present invention is in the form of a film, the step (S-1) can be carried out using a molding method that is commonly used for film molding, and may be a known film molding method. Further, when the molded article of the present invention has the shape of a laminated film, the step (S-1) can be carried out using a molding method commonly used for producing laminated films.

However, the molded article of the present invention is not limited to those produced by the above-described embodiments, and for example,
(SB-1) a step of cross-linking the resin composition (X1) by irradiation;
(SB-2) It may be obtained by a production method including a step of molding the crosslinked resin composition (X2) obtained in the step (S-1).

EXAMPLES The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[Manufacturing example]
The 4-methyl-1-pentene copolymer is prepared according to the polymerization method described in Production Example 1 ([0183] to [0185]) of JP-A-2018-162408. Polymer (A-1) was obtained by changing the proportions of 4-methyl-1-pentene, α-olefin and hydrogen used so that the physical properties were the values shown in Table 1. That is, the polymer (A-1) uses, as a polymerization catalyst, a metallocene catalyst component obtained by the method described in [0181] to [0182] of JP-A-2018-162408, and this metallocene catalyst component, It is a copolymer obtained by copolymerizing 4-methyl-1-pentene with a mixture of equal weights of 1-hexadecene and 1-octadecene in the presence of triisobutylaluminum and hydrogen.

Methods for measuring various physical properties of the polymer (A-1) are shown below.
(1) Composition Composition derived from at least one olefin selected from ethylene and α-olefins having 3 to 20 carbon atoms (excluding 4-methyl-1-pentene) in the 4-methyl-1-pentene polymer The unit (comonomer) content was calculated from the ¹³ C-NMR spectrum using the following equipment and conditions.

Using a Bruker Biospin AVANCEIIIcryo-500 type nuclear magnetic resonance apparatus, the solvent is o-dichlorobenzene/benzene-d ₆ (4/1 v/v) mixed solvent, the sample concentration is 55 mg/0.6 mL, the measurement temperature is is 120°C, the observation nucleus is ¹³ C (125 MHz), the sequence is single-pulse proton broadband decoupling, the pulse width is 5.0 μs (45° pulse), the repetition time is 5.5 seconds, and the number of integrations is 64. 128 ppm of benzene-d ₆ was measured as a chemical shift reference. Using the integrated value of the main chain methine signal, the content of the constituent unit derived from the comonomer was calculated according to the following formula.
Content of structural units derived from comonomer (%) = [P / (P + M)] × 100
where P denotes the total peak area of the comonomer backbone methine signal and M denotes the total peak area of the 4-methyl-1-pentene backbone methine signal.

(2) Melt flow rate (MFR)
Melt flow rate (MFR) was measured under conditions of 260° C. and 5 kg load according to ASTM D1238.

(3) Melting point (Tm)
Using a DSC measuring device (DSC220C) manufactured by Seiko Instruments Inc., about 5 mg of a sample was packed in an aluminum pan for measurement and heated to 280°C at a rate of 10°C/min. After holding at 280°C for 5 minutes, the temperature was lowered to 20°C at 10°C/min. After holding at 20°C for 5 minutes, the temperature was raised to 280°C at 10°C/min. The temperature at which the apex of the crystal melting peak observed during the second heating was taken as the melting point.
Table 1 shows the measurement results of various physical properties of the polymer (A-1).

[Example 1]
The polymer (A-1) obtained in the above production example was used as the 4-methyl-1-pentene polymer (A). Also, a triallyl isocyanurate polymer (Mitsubishi Chemical Corporation, product name: Tyke Prepolymer) was used as a cross-linking aid.

A dry-blended mixture was prepared by blending 2 parts by mass of the above-mentioned type prepolymer with 100 parts by mass of polymer (A-1) and dry-blending.
After that, using a PCM-43 twin screw extruder manufactured by Ikegai Co., Ltd. (screw diameter 43 mm, L/D = 30), the above conditions were set at a temperature of 260°C, a resin extrusion rate of 20 kg/h, and a rotation speed of 150 rpm. The mixture was granulated to obtain a resin composition in the form of pellets.

After that, a mold in which an iron plate with a thickness of 2 mm hollowed out in a square of 8 cm is placed between two iron plates (that is, this mold is a cavity having a rectangular parallelepiped shape with a length of 8 cm, a width of 8 cm, and a depth of 2 mm 10.3 g of the obtained resin composition was filled in the portion (hollow portion) cut out of the mold. A compression molding machine (mold clamping 50 tons) manufactured by Shindo Kinzoku Kogyo Co., Ltd. was heated to 270° C., and the mold was inserted into the compression molding machine. After allowing the mold to stand still in this state to melt the resin composition in the mold, the mold was compressed with a pressure of 10 MPa and held for 6 minutes. After that, the mold was taken out, inserted into the compression molding machine set at 23° C., and cooled for 6 minutes while a pressure of 10 MPa was applied. A molded body having a thickness of 2 mm was taken out from the cavity of the mold and used as a press sheet sample.

The above press sheet sample was irradiated with an electron beam using an electron beam irradiation device EBC300-60 manufactured by NHV Corporation under the conditions of an acceleration voltage of 300 kV and a dose of 400 kGy. A radiation press sheet sample was used.

[Example 2]
A sample was prepared in the same manner as in Example 1, except that the amount of the cross-linking aid blended with respect to 100 parts by mass of the polymer (A-1) was changed to 5 parts by mass.

[Example 3]
A sample was prepared in the same manner as in Example 1, except that the amount of the cross-linking aid blended with respect to 100 parts by mass of the polymer (A-1) was changed to 10 parts by mass.

[Example 4]
A sample was prepared in the same manner as in Example 1, except that the amount of the cross-linking aid blended with respect to 100 parts by mass of the polymer (A-1) was changed to 30 parts by mass.

[Comparative Example 1]
A sample was prepared in the same manner as in Example 1, except that no cross-linking aid was added.

[Comparative Example 2]
A sample was prepared in the same manner as in Example 1, except that the cross-linking aid blended with 100 parts by mass of the polymer (A-1) was changed to triallyl isocyanurate (manufactured by Mitsubishi Chemical Corporation, product name: Tyke). Created.

[Comparative Example 3]
A sample was prepared in the same manner as in Comparative Example 2, except that the amount of the cross-linking aid added to 100 parts by mass of the polymer (A-1) was changed to 5 parts by mass.
The dry-blended mixtures, pressed sheet samples, and electron beam irradiated pressed sheet samples obtained in the above Examples and Comparative Examples were each evaluated as follows. Table 2 shows the results.

(blocking)
The state of the dry-blended mixture and clogging in the hopper during granulation were visually observed and evaluated. Evaluation was performed according to the following criteria.
○: No lumps when visually observed, no clogging during granulation △: There were lumps when visually observed, but no clogging occurred in the hopper ×: There were lumps when visually observed, and no clogging occurred Clogging occurred in the hopper during grain

(bleed)
After the press sheet sample was left at room temperature for one day, the surface was wiped with a Kimwipe, and the presence or absence of liquid adhesion to the Kimwipe was visually observed and evaluated according to the following criteria.
○: Adhesion of liquid to Kimwipe was not observed ×: Adhesion of liquid to Kimwipe was observed

(crosslink formation)
Using an MCR301 modular compact rheometer manufactured by Anton Paar, electron beam irradiation press sheet samples were measured under the conditions of load: torsional mode, swing angle: 0.1%, angular frequency: 10 rad/s, heating rate: 2 ° C./min. Dynamic viscoelasticity was measured and evaluated according to the following criteria.
Here, the ability to measure with a rheometer indicates that the electron beam irradiated press sheet sample does not melt and has elasticity, and crosslinks are formed.
○: Measurement was possible at 270 ° C. ×: Measurement was impossible at 270 ° C.

Claims (9)

A resin composition containing 100 parts by mass of a 4-methyl-1-pentene polymer (A) satisfying the following requirements (Aa) to (Ac) and 0.1 to 50 parts by mass of a cross-linking aid (B) Thing (X1).
(Aa) The content of the structural unit (U1) derived from 4-methyl-1-pentene is 80 to 100 mol%, and the α-olefin having 2 to 20 carbon atoms (4-methyl-1-pentene The content of the structural unit (U2) derived from 0 to 20 mol% [however, (the total content of the structural unit (U1) and the structural unit (U2) is 100 mol%). be.
(Ab) Melt flow rate (MFR) at 260° C. under 5 kg load is in the range of 0.01 to 250 g/10 min.
(Ac) The melting point (Tm) measured by DSC is in the range of 200 to 250°C. The resin composition (X1) according to claim 1, wherein the cross-linking aid (B) contains two or more cyclic structures represented by the following formula (1).

The resin composition (X1) according to claim 1 or 2, wherein the cross-linking aid (B) is a triallyl isocyanate prepolymer. A crosslinked resin composition (X2) obtained by crosslinking the resin composition (X1) according to any one of claims 1 to 3. A molded article comprising the crosslinked resin composition (X2) according to claim 4. The molded article according to claim 5, which is a release film or release paper. A resin composition containing 0.1 to 50 parts by mass of a crosslinking aid (B) for 100 parts by mass of a 4-methyl-1-pentene polymer (A) that satisfies the following requirements (Aa) to (Ac): Thing (X1),
A method for producing a crosslinked resin composition (X2), comprising a step of crosslinking by irradiation.
(Aa) The content of the structural unit (U1) derived from 4-methyl-1-pentene is 80 to 100 mol%, and the α-olefin having 2 to 20 carbon atoms (4-methyl-1-pentene The content of the structural unit (U2) derived from 0 to 20 mol% [however, (the total content of the structural unit (U1) and the structural unit (U2) is 100 mol%). be.
(Ab) Melt flow rate (MFR) at 260° C. under 5 kg load is in the range of 0.01 to 250 g/10 min.
(Ac) The melting point (Tm) measured by DSC is in the range of 200 to 250°C. The production method according to claim 7, wherein the cross-linking aid (B) contains two or more cyclic structures represented by the following formula (1).

The production method according to claim 7 or 8, wherein the cross-linking aid (B) is a triallyl isocyanate prepolymer.