KR20170014648A - Polyester resin composition and article comprising the same - Google Patents
Polyester resin composition and article comprising the same Download PDFInfo
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- KR20170014648A KR20170014648A KR1020150108359A KR20150108359A KR20170014648A KR 20170014648 A KR20170014648 A KR 20170014648A KR 1020150108359 A KR1020150108359 A KR 1020150108359A KR 20150108359 A KR20150108359 A KR 20150108359A KR 20170014648 A KR20170014648 A KR 20170014648A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0033—Additives activating the degradation of the macromolecular compound
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
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Abstract
Description
The present invention relates to a polyester resin composition and a molded article containing the same. More specifically, the present invention relates to a polyester resin composition having excellent dimensional stability and a molded article containing the same.
The thermoplastic resin composition has a lower specific gravity than glass and metal and is excellent in properties such as moldability and impact resistance and is useful for a housing for an electric / electronic product, an automobile interior / exterior material, and a building exterior material. In particular, with the recent trend toward larger and lighter electric / electronic products, plastic products using thermoplastic resins are rapidly replacing existing glass and metal areas.
Among them, polyester resins such as PolyEthylene Terephtalate (PET) have excellent properties such as weather resistance, impact resistance, chemical resistance and high gloss, and are utilized in various fields. However, since polyethylene terephthalate is hydrolyzed at a high temperature and has a low glass temperature, it is not suitable for use in parts that require high heat resistance, such as electrical and electronic products and automobile interior and exterior materials.
Therefore, a technique has been proposed in which the crystallinity of the polyethylene terephthalate resin is increased to improve heat resistance, or a crystalline polyester resin such as polybutylene terephthalate is mixed and used. However, when such a crystalline polyester resin as described above is used, shrinkage due to crystallization occurs to cause product deformation and dimensional stability is poor.
A related prior art is Korean Patent Laid-Open No. 10-2002-0062403.
An object of the present invention is to provide a polyester resin composition excellent in dimensional stability.
Another object of the present invention is to provide a molded article formed from the polyester resin composition.
In one aspect, the present invention relates to (A) a base resin comprising (A1) a first alicyclic polyester resin and (A2) a second alicyclic polyester resin; And (B) a reactive oligomer. The proportion of units derived from isophthalic acid in units derived from a dicarboxylic acid component is less than 3 mol%, and the content of the second alicyclic polyester resin (A2) Is a proportion of units derived from isophthalic acid in units derived from a dicarboxylic acid component of 3 to 10 mol%.
The first alicyclic polyester resin (A1) and the second alicyclic polyester resin (A2) each have a ratio of units derived from cyclohexylene dimethanol among units derived from a diol component of 50 to 100 mol% .
The first alicyclic polyester resin (A1) and the second alicyclic polyester resin (A2) may each have an intrinsic viscosity of 0.6 to 1.4 dL / g.
The first alicyclic polyester resin (A1) may be contained in an amount of 50 to 95 parts by weight based on 100 parts by weight of the base resin (A), and the second alicyclic polyester resin (A2) May be contained in an amount of 5 to 50 parts by weight based on 100 parts by weight.
The reactive oligomer may include at least one reactive group, and the reactive group may include at least one of an epoxy group and a (meth) acryl group. The reactive oligomer preferably has a molecular weight of 500 g / mol or more. The reactive oligomer may be contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the base resin (A).
The polyester resin composition according to the present invention may further comprise (C) an inorganic filler. At this time, the inorganic filler (C) may be one or more of glass fiber, carbon fiber, ceramic fiber, metal fiber, glass bead, carbon black, mica, talc, wollastonite, calcium carbonate, aluminum hydroxide, clay and whiskers Or more. The content of the inorganic filler (C) is preferably 20 to 50 parts by weight based on 100 parts by weight of the combined weight of the base resin (A) and the inorganic filler (C).
The specimen prepared by injection molding of the polyester resin composition was heated at a rate of 5 ° C / min while the thermal expansion coefficient in the machine direction (Machine Direction) measured at 25 ° C to 250 ° C was 15 μm / (m · ° C) (Transverse Direction) may have a thermal expansion coefficient of 100 占 퐉 / (m 占 폚) or less. In this case, the MD direction means a flow direction at the time of injection molding, and the TD direction means a direction perpendicular to the MD direction.
Further, the warpage measured after leaving the specimen produced by injection molding of the polyester resin composition at 25 ° C for 1 hour may be 7 mm or less.
In another aspect, the present invention provides a molded article comprising the polyester resin composition according to the present invention described above.
The polyester resin composition according to the present invention is excellent in dimensional stability and can be usefully used as an exterior material for electronic products and the like.
Hereinafter, the present invention will be described more specifically.
A polyester resin composition according to one embodiment of the present invention comprises (A) a base resin comprising (A1) a first alicyclic polyester resin and (A2) a second alicyclic polyester resin; And (B) reactive oligomers.
(A) Base resin
The polyester resin composition according to one embodiment of the present invention uses an alicyclic polyester resin as a base resin and two alicyclic polyester resins having different units derived from isophthalic acid.
The alicyclic polyester resin is a polyester resin containing a cycloaliphatic group in its main chain, and may be, for example, a polyester resin containing a unit represented by the following formula (1).
[Chemical Formula 1]
* -O-A-COO-B-O- *
In the above formula (1), A is a substituted or unsubstituted aromatic hydrocarbon, a substituted or unsubstituted aliphatic hydrocarbon, or a substituted or unsubstituted alicyclic hydrocarbon. B may be a substituted or unsubstituted alicyclic hydrocarbon, preferably a cyclohexylene group.
The alicyclic polyester resin may have a melting point of 200 ° C or higher, preferably 220 ° C to 380 ° C, more preferably 260 ° C to 320 ° C.
More specifically, the alicyclic polyester resin may be polycyclohexylenedimethylene terephthalate (POLYCYCLOHEXYLENE DIMETHYLENE TEREPHTHALATE (PCT)).
The alicyclic polyester resin may be prepared by polymerizing a diol component and a dicarboxylic acid component, and the diol component may include a diol compound containing an alicyclic group.
The diol compound containing the alicyclic group may be, for example, 1,4-cyclohexanedimethanol (CHDM), but is not limited thereto.
On the other hand, the diol component may further include diol compounds other than cyclohexylene dimethanol. Examples of the other diol compounds include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 2,2-dimethyl-1,3-propanediol, 1,3- Butanediol, 1,5-pentanediol, 1,5-pentanediol, 1,6-hexanediol, and the like, but not limited thereto.
As an example, when the diol component further comprises ethylene glycol, the diol component may comprise 50 to 100 mole% of cyclohexylene dimethanol and 0 to 50 mole% of ethylene glycol. Preferably 50 to 80 mol% of 1,4-cyclohexylenedimethanol and 20 to 50 mol% of ethylene glycol. The diol component containing ethylene glycol can improve the mechanical properties such as impact resistance without lowering the heat resistance of the polyester resin.
Examples of the dicarboxylic acid component include terephthalic acid (TPA), isophthalic acid (IPA), 1,2-naphthalene dicarboxylic acid, 1,4-naphthalene dicarboxylic acid, 1,5- Naphthalene dicarboxylic acid, 1,6-naphthalene dicarboxylic acid, 1,6-naphthalene dicarboxylic acid, 1,6-naphthalene dicarboxylic acid, 1,6-naphthalene dicarboxylic acid, Naphthalene dicarboxylic acid and 2,7-naphthalene dicarboxylic acid; aromatic dicarboxylic acids such as dimethyl terephthalate (DMT), dimethyl isophthalate, dimethyl-1,2-naphthalate, Naphthalate, dimethyl-1,7-naphthalate, dimethyl-1,7-naphthalate, dimethyl-1,7-naphthalate, Aromatic dicarboxylates such as naphthalate and dimethyl-2,7-naphthalate, and the like can be used. The dicarboxylic acid component may be used alone or in combination of two or more. Preferably, the dicarboxylic acid component is terephthalic acid, isophthalic acid or a combination thereof.
Specifically, the base resin (A) is preferably a mixture of a first alicyclic polyester resin in which the proportion of units derived from isophthalic acid in the units derived from the dicarboxylic acid component is less than 3 mol% and a second alicyclic polyester resin derived from a dicarboxylic acid component And the ratio of the units derived from isophthalic acid is 3 to 10 mol%. When two kinds of alicyclic polyester resins differing in the ratio of isophthalic acid in the dicarboxylic acid component are mixed and used, the occurrence of shrinkage after curing can be suppressed, thereby improving the dimensional stability of the final product have. Hereinafter, the first alicyclic polyester resin and the second alicyclic polyester resin will be described in more detail.
(A1) First Aliens Polyester resin
In the present invention, the (A1) first alicyclic polyester resin may be an alicyclic polyester resin in which the proportion of units derived from isophthalic acid in the units derived from the dicarboxylic acid component is less than 3 mol%. Preferably, the (A1) first alicyclic polyester resin may be polycyclohexylenedimethylene terephthalate in which the proportion of units derived from isophthalic acid in the units derived from dicarboxylic acid is less than 3 mol%.
In the first alicyclic polyester resin (A1), the dicarboxylic acid component other than isophthalic acid is not particularly limited, but terephthalic acid is preferable. For example, the first alicyclic polyester resin may be prepared by mixing terephthalic acid in an amount of more than 97 mol% and less than 3 mol% of isophthalic acid with a dicarboxylic acid component, but is limited thereto no.
On the other hand, the (A1) first alicyclic polyester resin may be one prepared by using cyclohexylenedimethanol as the diol component. For example, in the first alicyclic polyester resin (A1), the proportion of the units derived from cyclohexylene dimethanol in the total units derived from the diol component is 50 to 100 mol%, preferably 80 to 100 mol% And more preferably 90 to 100 mol%.
When the ratio of the units derived from isophthalic acid and the units derived from cyclohexylene dimethanol in the first alicyclic polyester resin (A1) satisfy the above-described numerical range, the crystallinity of the polyester resin becomes high, Excellent heat resistance can be realized.
The content of the first alicyclic polyester resin (A1) may be 50 to 95 parts by weight, preferably 50 to 90 parts by weight, more preferably 60 to 90 parts by weight based on 100 parts by weight of the base resin. When the content of the first alicyclic polyester resin in the base resin satisfies the above range, excellent heat resistance and dimensional stability can be realized at the same time.
The first alicyclic polyester resin (A1) may have an intrinsic viscosity of 0.6 to 1.4 dl / g as measured at 35 using an o-chlorophenol solution (concentration: 0.5 g / dl) no. When the intrinsic viscosity of the first alicyclic polyester resin satisfies the above range, miscibility between the components of the composition is improved, and fluidity and dimensional stability are more excellent.
(A2) 2nd Aliens Polyester resin
In the present invention, the (A2) second alicyclic polyester resin may be an alicyclic polyester resin in which the ratio of units derived from isophthalic acid in the units derived from dicarboxylic acid is 3 to 10 mol%. Preferably, the second alicyclic polyester resin (A1) may be polycyclohexylenedimethylene terephthalate in which the proportion of units derived from isophthalic acid in the units derived from dicarboxylic acid is 3 to 10 mol% have.
In the (A2) second alicyclic polyester resin, the dicarboxylic acid component other than isophthalic acid is not particularly limited, but terephthalic acid is preferable. For example, the second alicyclic polyester resin may be a dicarboxylic acid component prepared by mixing 90 to 97% by weight of terephthalic acid and 3 to 10% by weight of isophthalic acid, but is not limited thereto.
On the other hand, the (A2) second alicyclic polyester resin may be prepared by using cyclohexylenedimethanol as the diol component. For example, in the (A2) second alicyclic polyester resin, the proportion of the units derived from cyclohexane dimethanol in the total units derived from the diol component is 50 to 100 mol%, preferably 80 to 100 mol% And more preferably 90 to 100 mol%.
When the ratio of the units derived from isophthalic acid and the units derived from cyclohexylene dimethanol in the second alicyclic polyester resin (A2) satisfies the above-described numerical range, the flow properties of the polyester resin are improved, The occurrence of shrinkage can be prevented more effectively.
On the other hand, the content of the (A2) second alicyclic polyester resin may be 5 to 50 parts by weight, preferably 10 to 50 parts by weight, more preferably 10 to 40 parts by weight based on 100 parts by weight of the base resin. When the content of the second alicyclic polyester resin in the base resin satisfies the above range, excellent heat resistance and dimensional stability can be realized at the same time.
The second alicyclic polyester resin (A2) may have an intrinsic viscosity of 0.6 to 1.4 dl / g as measured at 35 using an o-chlorophenol solution (concentration: 0.5 g / dl) It is not. When the intrinsic viscosity of the second alicyclic polyester resin satisfies the above range, the miscibility between the components of the composition improves, and the fluidity and dimensional stability are more excellent.
(B) a reactive oligomer
The reactive oligomer (B) is for controlling the fluidity of the polyester resin, and may be an oligomer having a molecular weight of 500 g / mol or more and containing at least one reactive group. Preferably, the molecular weight of the reactive oligomer may range from 500 g / mol to 20000 g / mol.
At this time, the reactive group may include at least one of an epoxy group and a (meth) acryl group. Here, the (meth) acrylic group may be a methacrylic acid group, an acrylic acid group, a methacrylate group or an acrylate group.
In the reactive oligomer (B), the proportion of reactive groups may be 1 to 20 mol%, preferably 3 to 15 mol%, based on the total reactive oligomer. When the ratio of the reactive groups satisfies the above numerical range, a resin composition having excellent fluidity and dimensional stability can be formed.
Specifically, the reactive oligomer may be a polymer of a monomer containing the reactive group.
Examples of the monomer containing an epoxy group include, but are not limited to, glycidyl methacrylate, glycidyl acrylate, and the like.
Examples of the monomer containing a (meth) acrylic group include acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, But are not limited to, acrylate, acrylate, methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, propyl methacrylate, propyl acrylate, butyl methacrylate and butyl acrylate .
On the other hand, the (B) reactive oligomer may be a copolymer of two or more monomers having different reactive groups. Alternatively, the reactive oligomer (B) may be one obtained by copolymerizing at least one kind of monomer having a reactive group as described above with another monomer. Examples of the other monomers include, but are not limited to, ethylene, propylene, and the like.
For example, the reactive oligomer (B) may be a copolymer of polyethylene-butyl acrylate-glycidyl methacrylate, but is not limited thereto.
The above-mentioned (B) reactive oligomer can be produced by polymerizing the monomers, and the polymerization can be carried out by a known polymerization method such as emulsion polymerization, suspension polymerization, bulk polymerization and the like. Or a product commercially available as the above-mentioned (B) reactive oligomer may be used. For example, Elvaloy PTW manufactured by DuPont may be used.
The reactive oligomer (B) may be contained in an amount of 0.1 to 10 parts by weight, preferably 1 to 10 parts by weight, more preferably 1 to 5 parts by weight based on 100 parts by weight of the (A) base resin. When the content of the reactive oligomer satisfies the above range, the fluidity and dimensional stability of the resin composition are further improved.
(C) Weapons Filler
The inorganic filler (C) used in the present invention can improve the mechanical strength of the polyester resin composition, and known inorganic fillers can be used without limitation. The form of the inorganic filler may be fiber type, particle type, rod type, needle type, flake type, amorphous type and the like. In addition, the inorganic filler may have various shapes such as a circle, an ellipse, and a rectangle. For example, as the inorganic filler, fibrous inorganic filler including glass fiber, carbon fiber, ceramic fiber, metal fiber and the like, or glass beads, carbon black, mica, talc, wollastonite, calcium carbonate, Aluminum, clay and whiskers may be used alone or in combination of two or more.
From the viewpoint of mechanical properties, the inorganic filler (C) is preferably a glass fiber. The glass fibers may be glass fibers of circular and / or rectangular cross-section. The glass fiber of the circular section may have a section diameter of 5 to 20 탆 and a length of 2 to 20 mm before processing. The glass fibers having the rectangular cross section may have an aspect ratio of 1.5 to 10 and a length before processing of 2 to 20 mm. When such a glass fiber is used as the inorganic filler, the workability is improved and the mechanical properties such as the bending strength and the impact strength of the molded article are excellent.
On the other hand, as the inorganic filler (C), a surface treatment agent is coated on the surface of the inorganic filler to increase the bonding force with the polyester resin. The surface treating agent may be, for example, a silane compound, a urethane compound or an epoxy compound, but is not limited thereto.
The content of the inorganic filler (C) may be 20 to 50 parts by weight, preferably 30 to 50 parts by weight, assuming 100 parts by weight of the combined weight of the base resin (A) and the inorganic filler (C). Within the above range, the polyester resin composition may have excellent mechanical properties, heat resistance, molding processability, and the like.
The polyester resin composition of the present invention may further contain usual additives in addition to the above-described components in accordance with the intended use. Examples of the additives include antimicrobial agents, heat stabilizers, antioxidants, mold release agents, light stabilizers, surfactants, coupling agents, plasticizers, compatibilizers, lubricants, antistatic agents, flame retardants, flame retardants, anti-drip agents, weathering stabilizers, ultraviolet absorbers, And a mixture thereof.
The additive may be appropriately contained within a range that does not impair the physical properties of the polyester resin composition. Specifically, the additive may be contained in an amount of 20 parts by weight or less, for example, 0.1 to 15 parts by weight, based on 100 parts by weight of the polyester resin composition have.
The polyester resin composition of the present invention can be prepared by a known method. For example, each component and additives may be mixed with a Henschel mixer, a V blender, a tumbler blender, a ribbon blender, etc., and then melt-extruded in an extruder to produce a pellet.
The polyester resin composition of the present invention as described above has a small heat shrinkage and a small occurrence of warpage after molding, and thus is excellent in dimensional stability. Concretely, the specimen produced by injection molding the above-mentioned polyester resin composition is heated at a rate of 5 ° C / min and a coefficient of thermal expansion in the machine direction measured at 25 ° C to 250 is 15 μm / (m · ° C) or less And the thermal expansion coefficient in the TD direction (Transverse Direction) may be 100 m / (m ㆍ C) or less. In this case, the MD direction means a flow direction at the time of injection molding, and the TD direction means a direction perpendicular to the MD direction.
Further, the warpage measured after leaving the specimen produced by injection molding of the polyester resin composition at room temperature (25 ° C) for 1 hour may be 7 mm or less.
The molded article according to the present invention is formed from the polyester resin composition. For example, the polyester resin composition can be used to produce a molded article by a known molding method such as injection molding, double injection molding, blow molding, extrusion molding, and thermoforming. The molded article to which the polyester resin composition is applied has a small heat shrinkage ratio and is excellent in dimensional stability and can be usefully used as an outer cover material for electronic products.
Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples.
Example
The specifications of each component used in the following examples and comparative examples are as follows.
(A-1) First Aliens Polyester resin
Polycyclohexylenedimethylene terephthalate (manufactured by SK Chemicals) having an isophthalic acid content of 0.5 mol% and a cyclohexylenedimethanol content of 96 mol% was used.
(A-2) Second Aliens Polyester resin
Polycyclohexylenedimethylene terephthalate (manufactured by SK Chemicals) having an isophthalic acid content of 4.5 mol% and a cyclohexylene dimethanol content of 96 mol% was used.
(B) a reactive oligomer
Elvaloy PTW (ethylene / n-butyl acrylate / glycityl methacrylate copolymer) of DuPont was used as the reactive oligomer.
(C) Inorganic filler
Flat type glass fiber of Nottobo company with 4 aspect ratio was used.
[Example 1]
As shown in the following Table 1, 55% by weight of the first alicyclic polyester resin (A-1), 5% by weight of the second alicyclic polyester resin (A-2) And a reactive oligomer was added thereto in an amount of 4 parts by weight based on 100 parts by weight of the mixture to prepare a polyester resin composition.
[Example 2]
As in Example 1 except that the content of the first alicyclic polyester resin (A-1) and the content of the second alicyclic polyester resin (A-2) were changed as described in [Table 1] Respectively.
[Example 3]
Except that the content of the first alicyclic polyester resin (A-1), the second alicyclic polyester resin (A-2) and the reactive oligomer (B) were changed as shown in the following Table 1, The procedure of Example 1 was repeated.
[Example 4]
Except that the content of the first alicyclic polyester resin (A-1), the second alicyclic polyester resin (A-2) and the reactive oligomer (B) were changed as shown in the following Table 1, The procedure of Example 1 was repeated.
[Comparative Example 1]
The procedure of Example 1 was repeated, except that (A-2) the second alicyclic polyester resin and (B) the reactive oligomer were not used as described in [Table 1] below.
[Comparative Example 2]
The procedure of Example 1 was repeated except that (A-2) the second alicyclic polyester resin was not used as described in [Table 1] below.
The specimens were prepared using the polyester resins prepared in the Examples and Comparative Examples, and the thermal expansion coefficient in the MD direction, the thermal expansion coefficient in the TD direction, and the warpage characteristics were measured by the following methods. The measurement results are shown in Table 2.
How to measure property
(1) Coefficient of Thermal Expansion (CTE): The polyester resin compositions of the examples and comparative examples were extruded at a mold temperature of 130 ° C and an injection temperature of 300 ° C using a twin screw extruder with L / D = 36/1, To produce specimens of 6.4 × 12, 7 × 12, and 7 (mm) in size. The thermal expansion rates of the specimens in the MD direction and the TD direction were measured at 25 ° C to 250 ° C while raising the temperature at a heating rate of 5 ° C / min. The expansion ratio was measured using a TMA (ThermoMechanical Analyzer) equipment (TA company, TMA Q400).
(2) Warpage: The polyester resin compositions of Examples and Comparative Examples were injection-molded at a mold temperature of 130 占 폚 and an injection temperature of 300 占 폚 using a twin-screw extruder with L / D = 36/1, 10 × 10 (cm), 1T thick film type specimens were prepared. The specimen was left on a flat bottom surface at room temperature (25) for one hour, and then the distance between the edge portion of the specimen and the bottom surface was measured.
M / (m 占 폚)
As shown in Table 2, in the case of molded articles prepared using the compositions of Examples 1 to 4, in which the first alicyclic polyester resin and the second alicyclic polyester resin were mixed, the thermal expansion coefficient and the degree of warpage And the dimensional stability is excellent. On the other hand, in the case of Comparative Examples 1 and 2 using only the first alicyclic polyester resin, the thermal expansion coefficient and the degree of warpage are large and the dimensional stability is poor.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and variations are possible in light of the above teachings.
Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .
Claims (15)
(B) a reactive oligomer,
In the first alicyclic polyester resin (A1), the proportion of units derived from isophthalic acid in units derived from a dicarboxylic acid component is less than 3 mol%
The proportion of the unit derived from isophthalic acid in the unit derived from the dicarboxylic acid component in the (A2) second alicyclic polyester resin is 3 to 10 mol%.
The first alicyclic polyester resin (A1) and the second alicyclic polyester resin (A2) each have a ratio of units derived from cyclohexylene dimethanol among units derived from a diol component of 50 to 100 mol% Polyester resin composition.
Wherein the first alicyclic polyester resin (A1) and the second alicyclic polyester resin (A2) each have an intrinsic viscosity of 0.6 to 1.4 dL / g.
Wherein the first alicyclic polyester resin (A1) is contained in an amount of 50 to 95 parts by weight based on 100 parts by weight of the base resin (A).
Wherein the second alicyclic polyester resin (A2) is contained in an amount of 5 to 50 parts by weight based on 100 parts by weight of the base resin (A).
Wherein the reactive oligomer comprises at least one reactive group.
Wherein the reactive group comprises at least one of an epoxy group and a (meth) acryl group.
Wherein the reactive oligomer has a molecular weight of 500 g / mol or more.
Wherein the reactive oligomer is contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the base resin (A).
(C) an inorganic filler.
The inorganic filler (C) is at least one of glass fiber, carbon fiber, ceramic fiber, metal fiber, glass bead, carbon black, mica, talc, wollastonite, calcium carbonate, aluminum hydroxide, clay and whiskers. .
Wherein the content of the inorganic filler (C) is 20 to 50 parts by weight based on 100 parts by weight of the combined weight of the base resin (A) and the inorganic filler (C).
The specimen produced by the injection molding of the polyester resin composition was heated at a rate of 5 ° C / min while the MD direction thermal expansion coefficient measured at 25 ° C to 250 was 15 탆 / (m 占 폚) or less and the TD direction thermal expansion coefficient was 100 M / (m 占 폚) or less.
Wherein the warpage value measured after leaving the specimen produced by injection-molding the polyester resin composition at 25 占 폚 for 1 hour is 7 mm or less.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019231156A1 (en) * | 2018-05-28 | 2019-12-05 | Kim Dae Won | Polymer blend composition |
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2015
- 2015-07-30 KR KR1020150108359A patent/KR101786185B1/en active IP Right Grant
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019231156A1 (en) * | 2018-05-28 | 2019-12-05 | Kim Dae Won | Polymer blend composition |
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| Publication number | Publication date |
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| KR101786185B1 (en) | 2017-10-16 |
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