JP5441428B2 - Interfacial adhesion control using hyperbranched polymer - Google Patents

Description

  The present invention relates to an internal release agent comprising a hyperbranched polymer. Specifically, by adding a specific hyperbranched polymer to a resin composition, the composition is separated from a mixing / molding machine or a mold in a molding process. The present invention relates to an internal release agent that is excellent in moldability or releasability from other resin molded products such as a film.

In recent years, polymer materials have been increasingly used in many fields. Along with this, the properties of the surface and interface as well as the properties of the polymer as a matrix have become important for each field, and in particular, improvements in properties related to control of interfacial adhesion, such as peelability and releasability. It has been demanded.
For example, in the adhesive field, the surface of a base material (film, etc.) is coated for the purpose of preventing adhesion or adhesion between a release film made of release paper or plastic film and an adhesive substance. Giving peelability is performed.

In the resin molding field, plastics and synthetic rubber resins are used for injection molding, extrusion molding, etc. as parts and structural members for automobiles, various electrical equipment (TVs, personal computers, mobile phones, etc.), building materials, and office supplies. Therefore, there is a demand for improvement in releasability (peelability) to various machines and molds formed in a desired shape and in a molding process.
In order to impart releasability to a resin or the like, a technique for blending an additive (release agent or release agent) that imparts releasability to a resin that is a raw material of a molded product has been proposed. For example, a linear polymer A method using a compound as a release agent has been proposed (see Patent Documents 1 to 3).

In the method using the above-described linear polymer compound as a release agent, since the resin that is the base of the resin molded product is an organic substance having a carbon atom as a skeleton, the compatibility between the matrix resin and the release agent is high. While it has the feature of being easy to mix and disperse in a resin without causing aggregation or the like, it cannot be said that the peelability is sufficient, and an improvement in peelability has been demanded.
In addition, regarding the peelability of films and the like, there has been a demand for a technique for imparting activity to the interface between the resin and the substrate in order to impart peelability to the substrate.

  As a result of intensive studies to achieve the above object, the present inventors have adopted a highly branched polymer, which has not been studied in the past, as a release agent, so that the matrix resin is excellent in mixing and dispersibility. Compared to conventional linear polymer release agents, the composition does not cause cohesion in the mixing / molding machine and mold release in the molding process, or other resins such as films. The present invention has been completed by finding that it can be an internal release agent that is excellent in releasability to a molded product.

That is, as a first aspect of the present invention, the monomer A having two or more radical polymerizable double bonds in the molecule is polymerized in an amount of 5 mol% to 200 mol% with respect to 1 mol of the monomer A. The present invention relates to an internal release agent comprising a highly branched polymer obtained by polymerization in the presence of agent B.
As a second aspect, the present invention relates to the internal release agent according to the first aspect, in which the monomer A is divinylbenzene.
As a third aspect, the present invention relates to the internal release agent according to the first aspect or the second aspect, in which the polymerization initiator B is 2,2′-azobis (dimethyl isobutyrate).
As a fourth aspect, the present invention relates to the internal release agent according to the first aspect or the second aspect, in which the polymerization initiator B is 2,2′-azobis (2,4,4-trimethylpentane).
As a fifth aspect, the present invention relates to a thermoplastic resin composition containing the internal release agent according to any one of the first aspect to the fourth aspect, and a thermoplastic resin.
As a sixth aspect, the present invention relates to the thermoplastic resin composition according to the fifth aspect, wherein the content of the internal release agent is 0.3% by mass to 20% by mass with respect to the thermoplastic resin.
As a seventh aspect, the present invention relates to the thermoplastic resin composition according to the fifth aspect or the sixth aspect, wherein the thermoplastic resin is a polycarbonate resin.
As an 8th viewpoint, it is related with the resin molded product made through heat processing from the thermoplastic resin composition of any one of 5th viewpoint thru | or 7th viewpoint.
As a ninth aspect, the present invention relates to the resin molded product according to the eighth aspect, wherein the content of the internal release agent is higher in the surface portion of the resin molded product than in the resin molded product.
As a tenth aspect, the present invention relates to a thermosetting resin composition containing the internal release agent according to any one of the first aspect to the fourth aspect and a thermosetting resin.
As a 11th viewpoint, it is related with the thermosetting resin composition as described in a 10th viewpoint whose content of the said internal peeling agent is 0.3 mass% thru | or 20 mass% with respect to a thermosetting resin.
As a 12th viewpoint, it is related with the resin molded product made through heat processing from the thermosetting resin composition as described in a 10th viewpoint or an 11th viewpoint.
The thirteenth aspect relates to the resin molded article according to the twelfth aspect, wherein the content of the internal release agent is higher in the surface portion of the resin molded article than in the resin molded article.

The internal release agent of the present invention is composed of a highly branched polymer in which a branched structure is positively introduced, whereas the linear polymer used as a conventional release agent is generally in a string shape. For this reason, the internal release agent of the present invention has less entanglement between molecules and shows a fine particle behavior compared to a conventional release agent composed of a linear polymer, that is, it can be easily moved in a matrix resin. Become.
The internal release agent of the present invention can easily move to the interface (molded product surface) and contribute to the control of the interfacial adhesion, leading to an improvement in the releasability and releasability of the resin.
Further, the internal release agent of the present invention has high compatibility with the matrix resin, and can be mixed and dispersed without causing aggregation or the like in the resin.

  Further, since the resin molded product of the present invention has a larger amount of the internal release agent on the surface (interface) of the molded product than in the molded product (deep part), various machines such as mixing / molding machines and gold It can be excellent in releasability to a mold or releasability from other resin molded products such as a film.

FIG. 1 is a diagram showing the surface fraction of HA-DVB at the outermost surface of the HA-DVB / PS blend thin film. FIG. 2 is a diagram showing the interfacial shear bond strength with respect to the surface fraction of the HA-DVB / PS blend thin film. FIG. 3 is a diagram showing a peel strength test result in a laminated film composed of a PC single film or a HA-DVB / PC bulk film (unheated / heat treated) and a PET film.

The internal release agent of the present invention comprises a monomer A having two or more radically polymerizable double bonds in the molecule of the polymerization initiator B in an amount of 5 mol% to 200 mol% with respect to 1 mol of the monomer A. It consists of a hyperbranched polymer obtained by polymerizing in the presence.

In the present invention, examples of the monomer A having two or more radically polymerizable double bonds in the molecule include organic compounds shown in the following (A1) to (A7).
(A1) Vinyl hydrocarbon:
(A1-1) Aliphatic vinyl hydrocarbons; isoprene, butadiene, 3-methyl-1,2-butadiene, 2,3-dimethyl-1,3-butadiene, 1,2-polybutadiene, pentadiene, hexadiene, octadiene (A1-2) Alicyclic vinyl hydrocarbons; cyclopentadiene, cyclohexadiene, cyclooctadiene, norbornadiene, etc. (A1-3) aromatic vinyl hydrocarbons; divinylbenzene, divinyltoluene, divinylxylene, trivinylbenzene , Divinylbiphenyl, divinylnaphthalene, divinylfluorene, divinylcarbazole, divinylpyridine, etc. (A2) Vinyl esters, allyl esters, vinyl ethers, allyl ethers, vinyl ketones:
(A2-1) vinyl ester; divinyl adipate, divinyl maleate, divinyl phthalate, divinyl isophthalate, divinyl itaconate, vinyl (meth) acrylate, etc. (A2-2) allyl ester; diallyl maleate, diallyl phthalate, Diallyl isophthalate, diallyl adipate, allyl (meth) acrylate, etc. (A2-3) vinyl ether; divinyl ether, diethylene glycol divinyl ether, triethylene glycol divinyl ether, etc. (A2-4) allyl ether; diallyl ether, diaryloxyethane, Triaryloxyethane, tetraallyloxyethane, tetraallyloxypropane, tetraallyloxybutane, tetrametalloxyethane, etc. (A2-5) vinyl ketone; divinyl ketone, diallyl ketone, etc. (A ) (Meth) acrylic acid ester:
Ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, glycerol tri (meth) acrylate, Pentaerythritol tetra (meth) acrylate, alkoxy titanium tri (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 2-methyl-1,8-octanediol di (meth) acrylate, 1,9-nonanediol Di (meth) acrylate, 1,10-decanediol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, dioxane glycol di (meth) acrylate, 2-hydroxy 1-acryloyloxy-3-methacryloyloxypropane, 2-hydroxy-1,3-di (meth) acryloyloxypropane, 9,9-bis [4- (2- (meth) acryloyloxyethoxy) phenyl] fluorene , Undecylenoxyethylene glycol di (meth) acrylate, bis [4- (meth) acryloylthiophenyl] sulfide, bis [2- (meth) acryloylthioethyl] sulfide, 1,3-adamantanediol di (meth) acrylate 1,3-adamantane dimethanol di (meth) acrylate and the like (A4) vinyl compound having a polyalkylene glycol chain:
Polyethylene glycol (molecular weight 300) di (meth) acrylate, polypropylene glycol (molecular weight 500) di (meth) acrylate, etc. (A5) Nitrogen-containing vinyl compounds:
Diallylamine, diallyl isocyanurate, diallyl cyanurate, methylenebis (meth) acrylamide, bismaleimide, etc. (A6) silicon-containing vinyl compounds:
Dimethyldivinylsilane, divinylmethylphenylsilane, diphenyldivinylsilane, 1,3-divinyl-1,1,3,3-tetramethyldisilazane, 1,3-divinyl-1,
1,3,3-tetraphenyldisilazane, dietodivinylsilane, etc. (A7) fluorinated vinyl compounds:
1,4-divinylperfluorobutane, 1,4-divinyloctafluorobutane, 1,6-divinylperfluorohexane, 1,6-divinyldodecafluorohexane, 1,8-divinylperfluorooctane, 1,8-divinyl Hexadecafluorooctane, etc.

  Of these, preferred are the aromatic vinyl hydrocarbon compounds of the above group (A1-3), vinyl esters, allyl esters, vinyl ethers, allyl ethers and vinyl ketones of the group (A2), (meth) acrylic of the group (A3). Acid esters, vinyl compounds having a polyalkylene glycol chain of group (A4), and nitrogen-containing vinyl compounds of group (A5), particularly preferred are divinylbenzenes belonging to group (A1-3), (A2 ) Diallyl phthalate belonging to group (A3), ethylene glycol di (meth) acrylate belonging to group (A3), 1,3-adamantanedimethanol di (meth) acrylate, and methylene bis (meth) acrylamide belonging to group (A5), Among these, divinylbenzene is more preferable.

As the polymerization initiator B in the present invention, an azo polymerization initiator is preferably used. As the azo polymerization initiator, an oil-soluble azo polymerization initiator and a water-soluble azo polymerization initiator can be used.
As an oil-soluble azo polymerization initiator,
(1) Azonitrile type; 2,2′-azobisisobutyronitrile, 1,1′-azobiscyclohexane-1-carbonitrile, 2,2′-azobis-4-methoxy-2,4-dimethylvaleronitrile 2,2′-azobis-2,4-dimethylvaleronitrile, 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2′-azobis (2-methylbutyronitrile) etc,
(2) Azoamide type; 2,2′-azobis [N- (2-propenyl) -2-methylpropionamide], 2,2′-azobis (N-butyl-2-methylpropionamide), 2,2 ′ -Azobis (N-cyclohexyl-2-methylpropionamide), etc.
(3) Others: 2,2′-azobis (2,4,4-trimethylpentane), 2,2′-azobis (dimethyl isobutyrate), 1,1′-azobis (1-acetoxy-1-phenylethane) Etc.
Of these, (3) and others are preferred, and 2,2′-azobis (dimethyl isobutyrate) and 2,2′-azobis (2,4,4-trimethylpentane) are particularly preferred.
As a water-soluble azo polymerization initiator,
(1) Azonitrile type; 2- (carbamoylazo) isobutyronitrile, etc.
(2) Azoamide type; 2,2′-azobis {2-methyl-N- [2- (1-hydroxybutyl)] propionamide}, 2,2′-azobis [2-methyl-N- (2-hydroxy) Ethyl) propionamide], 2,2′-azobis (2-methylpropionamide) dihydrochloride, 2,2′-azobis [N- (2-carboxyethyl) -2-methylpropionamidine], etc.
(3) alicyclic azoamide type; 2,2′-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2′-azobis [2- (2-imidazoline- 2-yl) propane] dihydrochloride, 2,2′-azobis [2- (2-imidazolin-2-yl) propane] disulfate dihydrate, 2,2′-azobis [2- (3,4,5) , 6-Tetrahydropyrimidin-2-yl) propane] dihydrochloride, 2,2′-azobis {2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl] propane} dihydrochloride, 2,2 '-Azobis [2- (2-imidazolin-2-yl) propane] and the like.

  Of these, oil-soluble azo polymerization initiators such as 2,2'-azobis (dimethyl isobutyrate) and 2,2'-azobis (2,4,4-trimethylpentane) are particularly preferable.

  The polymerization initiator B is used in an amount of 5 mol% to 200 mol%, preferably 20 mol% to 150 mol%, based on 1 mol of the monomer A having two or more radical polymerizable double bonds in the molecule. It is used in an amount of mol%, more preferably 50 mol% to 100 mol%.

The internal release agent of the present invention is obtained by polymerizing the aforementioned monomer A in the presence of a predetermined amount of polymerization initiator B. As the polymerization method, known methods such as solution polymerization, dispersion polymerization, and precipitation polymerization are used. , And bulk polymerization, among which solution polymerization or precipitation polymerization is preferable. Polymerization in an organic solvent is particularly preferred from the viewpoint of molecular weight control.
Examples of organic solvents used here include aromatic hydrocarbon solvents such as benzene, toluene, xylene, ethylbenzene, and tetralin; aliphatic or alicyclic hydrocarbons such as n-hexane, n-heptane, mineral spirit, and cyclohexane. Solvent: Halogen solvents such as methyl chloride, methyl bromide, methyl iodide, methylene dichloride, chloroform, carbon tetrachloride, trichloroethylene, perchloroethylene, orthodichlorobenzene; ethyl acetate, butyl acetate, methoxybutyl acetate, methyl cellosolve acetate , Ethyl cellosolve acetate, propylene glycol monomethyl ether acetate, etc. ester or ester ether solvents; diethyl ether, tetrahydrofuran, dioxane, ethyl cellosolve, butyl cellosol Ether solvents such as propylene glycol monomethyl ether; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, di-n-butyl ketone and cyclohexanone; methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, t -Alcohol solvents such as butanol, 2-ethylhexyl alcohol and benzyl alcohol; amide solvents such as dimethylformamide and dimethylacetamide; sulfoxide solvents such as dimethyl sulfoxide, heterocyclic compound solvents such as N-methylpyrrolidone, and the like The 2 or more types of mixed solvent of these are mentioned.
Of these, aromatic hydrocarbon solvents, chlorine solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, amide solvents, sulfoxide solvents, and the like are preferred, with toluene being particularly preferred. Xylene, orthodichlorobenzene, butyl acetate, dioxane, dimethylformamide, dimethylacetamide, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate and the like.

When the polymerization reaction is performed in the presence of an organic solvent, the content of the organic solvent in the entire polymerization reaction product is preferably 1% by weight to 300% by weight, more preferably 10% by weight to 100% by weight.
The polymerization reaction is carried out at normal pressure, under pressure or under reduced pressure, and preferably under pressure and under pressure. The temperature of the polymerization reaction is preferably 50 to 200 ° C, more preferably 70 to 150 ° C.

  After completion of the polymerization reaction, the obtained hyperbranched polymer is recovered by an arbitrary method, and post-treatment such as washing is performed as necessary. Examples of a method for recovering the polymer from the reaction solution include a method such as reprecipitation.

  In addition, the weight average molecular weight (hereinafter abbreviated as Mw) of the obtained hyperbranched polymer is preferably 10,000 to 1,000,000, more preferably 20,000 to 800,000, and most preferably 40 in terms of polystyrene. , 000-700,000.

The present invention also relates to a thermoplastic resin composition containing the internal release agent and a thermoplastic resin, or a thermosetting resin composition containing the internal release agent and a thermosetting resin.
The thermoplastic resin used in the thermoplastic resin composition is not particularly limited. For example, polyethylene resin, polypropylene resin, polystyrene resin, acrylonitrile / butadiene / styrene resin (ABS), polycarbonate resin, polyethylene terephthalate resin, polyamide resin, polyimide Examples thereof include resins, (meth) acrylic resins, polyester resins (including polyethylene terephthalate), and polycarbonate resins and polystyrene resins are particularly preferable.
The thermosetting resin used in the thermosetting resin composition is not particularly limited, and examples thereof include phenol resins, urea resins, melamine resins, unsaturated polyester resins, polyurethane resins, and epoxy resins.
In these thermoplastic resin compositions or thermosetting resin compositions, the blending amount of the internal release agent with respect to the thermoplastic resin or thermosetting resin is preferably 0.3 mass with respect to the thermoplastic resin or thermosetting resin. % To 20% by mass, particularly preferably 10% to 20% by mass.

  In the thermoplastic resin composition or thermosetting resin composition, additives generally added to the thermoplastic resin or thermosetting resin, such as antistatic agents, lubricants, thermal stabilizers, antioxidants, Light stabilizers, fluorescent agents, processing aids, crosslinking agents, dispersants, foaming agents, flame retardants, antifoaming agents, reinforcing agents, pigments, and the like may be used in combination.

  The thermoplastic resin composition or thermosetting resin composition of the present invention obtains a resin molded product such as a film, a sheet, or a molded product by an arbitrary molding method such as injection molding, extrusion molding, press molding, or blow molding. In addition, the heat treatment after the molding further increases the movement of the internal release agent to the surface of the molded product, leading to an improvement in the peelability. The heat treatment temperature is preferably a glass transition point of the thermoplastic resin used in the resin composition or a temperature in the vicinity of glass transition point + 50 ° C., and the treatment time is not particularly limited, but is approximately 12 hours to 48 hours depending on the heat treatment temperature. is there.

  As described above, the resin molded product of the present invention is in a state in which more of the internal release agent is present on the surface (interface) of the molded product than in the molded product (deep part). For this reason, it can be excellent in releasability to various machines and molds such as a mixing / molding machine used at the time of forming a molded product, or peelability from other resin molded products such as a film.

EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited by this.
In addition, the analyzers and analysis conditions used in the examples are as follows.

[GPC (gel permeation chromatography)]
Equipment: HLC-8220 GPC manufactured by Tosoh Corporation
Column: Shodex (registered trademark) KF-804L + KF-805L
Column temperature: 40 ° C
Solvent: Tetrahydrofuran Detector: UV (254 nm), RI
Calibration curve: Standard polystyrene [spin coating]
Apparatus: Spin coater K-359SD2 manufactured by Kyowa Riken Co., Ltd.
[Vacuum heating]
Equipment: Tokyo Rika Kikai Co., Ltd. Vacuum constant temperature dryer VOS-201SD
[Press molding]
Equipment: Desktop test press S type SA-303-II-S manufactured by Tester Sangyo Co., Ltd.
[XPS (X-ray photoelectron spectroscopy) measurement]
Apparatus: PHI ESCA 5800 manufactured by Physical Electronics
X-ray source: Monochromatic AI Kα ray (2mmΦ)
X-ray output: 200W, 14mA
Photoelectron emission angle: 45 degrees [Tensile testing machine]
Equipment: Tensilon universal testing machine manufactured by A & D Co., Ltd.

<Reference Example 1: Production of hyperbranched polymer (HA-DVB)>
HA-DVB is published in Journal of Applied Polymer Science, Vol. 100, 664-670 (2006). In addition, 5.2 g of divinylbenzene (DVB-960 manufactured by Nippon Steel Chemical Co., Ltd.) is used as the monomer A having two or more radical polymerizable double bonds in the molecule, and 2,2′-azobis is used as the polymerization initiator B. 7.4 g of (dimethyl isobutyrate) (MAIB manufactured by Otsuka Chemical Co., Ltd.) was used.
The weight average molecular weight Mw measured in terms of polystyrene by GPC of this HA-DVB was 63,000, and the degree of dispersion: Mw (weight average molecular weight) / Mn (number average molecular weight) was 4.4.

<Example 1: Production of HA-DVB / PS blend thin film>
The HA-DVB and linear polystyrene (manufactured by Aldrich, product number 32786-1-6: hereinafter referred to as PS) produced in Reference Example 1 are respectively 5/95, 10/90, 20/80, 30 / in mass ratio. The mixture was mixed to 70, and further dissolved in 95 parts by mass of toluene with respect to the total mass of HA-DVB and PS so that the solid concentration of the mixture was 5% by mass. (The mass fraction of HA-DVB (hereinafter referred to as bulk fraction) with respect to the total mass of HA-DVB and PS is 5%, 10%, 20%, and 30%, respectively).

  Each obtained toluene solution was spin-coated at 2,000 rpm for 60 seconds on a polyimide film (manufactured by Toray DuPont Co., Ltd., Kapton (registered trademark) H type, 75 μm thickness), and then at 25 ° C. for 24 hours. After drying, four types of HA-DVB / PS blend thin films having different HA-DVB fractions were formed. This blend thin film was further heat-treated at 150 ° C. for 24 hours in vacuum.

XPS measurement was performed on the outermost surface of the blended thin film (in a range of about 10 nm in depth from the surface), and the surface fraction of HA-DVB was determined. The results are shown in FIG.
As shown in FIG. 1, since the surface fraction of HA-DVB is increased as compared with the bulk fraction, HA-DVB is more on the outermost surface of the HA-DVB / PS blend thin film after the heat treatment. It was confirmed that many existed.

<Example 2: Adhesive strength test of HA-DVB / PS blend thin film>
About each of the HA-DVB / PS blend thin film produced in Example 1, two thin films having the same bulk fraction were bonded to each other so that the deposition area was 25 mm ² . The bonded two-layer film was placed on a silicon substrate, a weight was placed on the two-layer film, and bonded under a nitrogen atmosphere at 120 ° C. for 1 hour while applying a pressure of 0.35 MPa.
For each of the obtained adhesive two-layer films, based on a tensile shear bond strength test (JIS K6850) using a tensile tester, the two-layer films were separated at a rate of 5 mm / min, and the interfacial shear bond strength was evaluated. The results are shown in FIG.
As shown in FIG. 2, as the surface fraction of HA-DVB increases, the interfacial shear bond strength decreases remarkably, that is, by adjusting the outermost surface concentration of HA-DVB, adhesion (peeling) The result shows that the control is controllable.

<Example 3: Production of HA-DVB / PC bulk film>
0.1 g of HA-DVB produced in Reference Example 1 and 0.9 g of a commercially available polycarbonate (hereinafter referred to as PC) were dissolved in 15 g of chloroform. This solution was reprecipitated using 2 kg of methanol, and the precipitated solid was filtered and dried.
The obtained solid was press-molded at 5 MPa and 250 ° C. for 5 minutes to produce a 150 μm thick HA-DVB / PC bulk film.
Further, a PC single film having a thickness of 150 μm and a single PC was prepared in the same procedure except that HA-DVB was not added.

<Example 4; Peel strength test of HA-DVB / PC bulk film>
The HA-DVB / PC bulk film prepared in Example 3 was bonded to a PET film (manufactured by A & D, standard sample for Leo Vibron dynamic viscoelasticity automatic measuring instrument, 30 μm thickness), and at 200 ° C. using a press machine. Thermocompression bonding was performed while applying a pressure of 3 MPa for 5 minutes. Similarly, the PC single film and the PET film were bonded and thermocompression bonded.
About each obtained laminated film, 180 degree peeling test (JIS) using a tensile tester.
Based on K6854), the laminated film was pulled away at a speed of 300 mm / min, and the peel strength was evaluated. The results are shown in FIG.

<Example 5: Peel strength test of HA-DVB / PC bulk film (heat treatment)>
Except that the HA-DVB / PC bulk film prepared in Example 3 was previously heat-treated at 150 ° C. in a vacuum for 24 hours, the same operation as in Example 4 was performed to evaluate the peel strength. The results are shown in FIG.

  As shown in FIG. 3, the peel strength of the HA-DVB / PC bulk film was lower than that of the PC single film. In addition, the peel strength of the HA-DVB / PC bulk film after heat treatment (150 ° C., 24 hours) was further reduced as compared with the unheat-treated HA-DVB / PC bulk film. That is, this result shows that the addition of HA-DVB improves the peelability of the PC film, and the heat treatment further increases the proportion of the surface of HA-DVB, which further improves the peelability. showed that.

Japanese Patent No. 3094656 JP-A-11-124482 Japanese Patent Laid-Open No. 7-90029

Journal of Applied Polymer Science, Vol. 100, 664-670 (2006)

Claims (5)

It is obtained by polymerizing monomer A having two or more radically polymerizable double bonds in the molecule in the presence of polymerization initiator B in an amount of 5 mol% to 200 mol% with respect to 1 mol of monomer A. An internal release agent comprising a highly branched polymer ,
The monomer A is divinylbenzene,
The polymerization initiator B is 2,2′-azobis (dimethyl isobutyrate) or 2,2′-azobis (2,4,4-trimethylpentane).
An internal release agent with excellent peelability for polycarbonate or polystyrene resin molded products.   A thermoplastic resin composition comprising the internal release agent according to claim 1 and a polycarbonate resin or a polystyrene resin. The thermoplastic resin composition according to claim 2 , wherein the content of the internal release agent is 0.3% by mass to 20% by mass with respect to the thermoplastic resin. A resin molded product made from the thermoplastic resin composition according to any one of claims 2 and 3 through heat treatment. The resin molded product according to claim 4 , wherein the content of the internal release agent is higher in the surface portion of the resin molded product than in the resin molded product.

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