TWI571488B - Polycyclohexylenedimethylene terephthalate resin composition - Google Patents

Description

Polybutylene terephthalate dimethanol ester resin composition

The present invention relates to a poly(ethylene terephthalate) having improved tensile strength, tensile elongation and impact strength while maintaining excellent injection molding characteristics. Polycyclohexylene dimethylene terephthalate resin composition.

Polyalkylene terephthalate-based materials have been widely used as materials for articles such as fibers, films, articles, and the like because of their properties such as abrasion resistance, durability, and heat resistance. Like polyalkylene terephthalate, poly(ethylene terephthalate, hereinafter referred to as "PET"), polybutylene terephthalate (poly(butylene terephthalate), hereinafter referred to as "PBT"), poly(cyclohexylene dimethylene terephthalate) (hereinafter referred to as "PCT") and other materials have been commercialized.

Despite the good properties of PET, due to its relatively low crystallization rate, the use of nucleating agents and crystallization catalysts is still needed in engineering plastic applications where high crystallinity (crystalline) is required. Furthermore, in order to maintain a high crystallization rate, it is difficult to maintain a relatively high mold temperature in the injection molding process.

At the same time, since PBT has a faster crystallization rate than PET, PBT can overcome the problem of PET as an engineering plastic, that is, PET has a problem of slower crystallization rate, and has been widely used in engineering plastics applications. However, although PBT has better formability than PET, it is because of PBT. The heat deflection temperature is lower than that of PET, so PBT still has limitations in applications requiring high heat resistance.

Since PCT can overcome the problems of the above polyester materials, that is, the problem of formability which is slow in crystallization rate and the application limitation of low heat distortion temperature, it has become a new material attracting attention. PCT can be regarded as a crystalline polyester composed of terephthalic acid (hereinafter referred to as "TPA") or dimethyl terephthalate (hereinafter referred to as "DMT") and 1,4-cyclohexane. It is produced by an esterification reaction or a trans-esterification reaction of 1,4-cyclohexanedimethanol (hereinafter referred to as "CHDM").

Meanwhile, polyalkylene terephthalate resins such as PCT and the like have high abrasion resistance, high durability, and high heat resistance, and thus have been used for the preparation of fibers, films, and articles. At this time, the resin must have high crystallinity to ensure proper hardness, strength, and heat resistance at high temperatures.

However, as the crystallization of the resin increases, the brittleness and rigidity of the material increase but the elongation decreases. Thus, when the stretch ratio of the plastic is lowered and the brittleness is increased, the plastic is easily damaged by an external force. In particular, when a material having an increased degree of crystallinity is ejected in a mold, the cooled plastic adheres to the mold or is not easily detached from the mold because of its poor elongation.

In order to solve this problem, it is considered to increase the molecular weight of the resin. When the molecular weight of the resin is increased, the physical strength of the article made of the resin is increased, and the article is stably detached from the mold in the injection molding process.

However, when the molecular weight of the resin is increased, the viscosity of the molten resin in the injection molding process is also increased, so that the fluidity of the molten resin is instantaneously lowered, and the injection pressure is immediately increased.

In this way, in order to ensure proper fluidity of the composition in the injection molding process and excellent stretching properties which can be stably separated from the mold after crystallization, it has been found that the composition having excellent processability is extremely Urgent.

An object of the present invention is to provide a polytrimethylene terephthalate resin composition having improved tensile strength, elongation and impact strength while maintaining excellent injection molding characteristics.

Another object of the present invention is to provide an article formed from the resin composition.

The method of the present invention to achieve the above object is described below. According to an embodiment of the present invention, the present invention provides a polycyclohexylene dimethylene terephthalate resin composition comprising a first poly(cyclohexanedimethylene terephthalate) resin having a crystalline melting point. (crystal melting point) is greater than or equal to 295 ° C, and its intrinsic viscosity is less than or equal to 0.75 deciliter / gram (dL / g); and a second polybutylene terephthalate dimethanol ester resin, Its crystal melting point is less than or equal to 280 ° C, and its essential viscosity is greater than or equal to 0.75 dL / g.

The resin composition comprises 50 to 95% by weight of the first poly(cyclohexanedimethylene terephthalate) resin, and 5 to 50% by weight of the second poly(cyclohexanedimethylene terephthalate). Resin, based on the weight of the total resin.

The first and second poly(cyclohexanedimethylene terephthalate) resins having this property can be polymerized via a specific monomer.

According to an example, the first poly(cyclohexanedimethylene terephthalate) resin may be via cyclohexanedimethanol using a trans-isomer ratio of greater than or equal to 73 mole percent (mol%) ( Cyclohexanedimethanol).

According to another example, the second poly(cyclohexanedimethylene terephthalate) resin is polymerized using cyclohexanedimethanol having a trans isomer ratio of less than or equal to 70 mol%.

According to another example, the second poly(cyclohexanedimethylene terephthalate) resin is polymerized by using one or more comonomers, and the one or more copolymerization systems are selected from Isophthalic acid (IPA), isophthalic acid ester compound, ethylene glycol (EG), molecular weight between 100 and 3000 A group consisting of 1,3-propanediol, 1,4-butanediol, and polypropylene glycol.

According to another example, the resin composition may further comprise one or more additives selected from the group consisting of a filler, a pigment, a oxidative stabilizer, a lubricant, a reinforcing agent, and a nucleating agent. . Also, the content of the additive is from 20 to 60 parts by weight based on 100 parts by weight of the total resin.

Meanwhile, according to another example of the present invention, the present invention provides an article made of the poly(cyclohexanedimethylene terephthalate) resin composition.

The efficacy of the present invention is explained as follows: According to an embodiment of the present invention, a poly(cyclohexanedimethylene terephthalate) resin composition can have improved tensile strength, elongation and retention while maintaining excellent injection molding characteristics. Impact strength.

Specific examples of the poly(cyclohexanedimethylene terephthalate) resin composition of the present invention and articles made therethrough will be explained in detail below.

According to an embodiment of the present invention, the present invention provides a poly(cyclohexanedimethylene terephthalate) resin composition (hereinafter referred to as "resin composition") comprising two different polycyclohexane dimethanol terephthalate resins. (hereinafter referred to as "PCT resin"). Specifically, the resin composition comprises a first PCT resin having a crystal melting point of greater than or equal to 295 ° C and an intrinsic viscosity of less than or equal to 0.75 deciliter per gram (dL/g); and a second PCT The resin has a crystal melting point of less than or equal to 280 ° C and an intrinsic viscosity of greater than or equal to 0.75 dL/g. The intrinsic viscosity can be revealed by the following examples. The measured quantity is measured.

In general, a resin composition containing a high crystallinity resin has a high brittleness and rigidity coefficient, but has a poor elongation. However, an example of the present invention can provide a resin composition having an improved stretch ratio when two different PCT resins having different characteristics are combined to maintain superior crystallinity. Specifically, the resin composition comprising the first PCT resin and the second PCT resin has superior injection moldability, flows smoothly in a narrow mold flow path, and crystallizes at a rapid rate in an injection molding process, wherein The crystalline melting point of the first PCT resin is greater than or equal to 295 ° C, and its essential viscosity is less than or equal to 0.75 dL / g, the crystalline melting point of the second PCT resin is less than or equal to 280 ° C, and its intrinsic viscosity is greater than or equal to 0.75 dL / g. Further, since the resin composition has an excellent stretch ratio, the article formed by the resin composition can be stably released from the mold without being damaged.

The resin composition may include 50 to 95% by weight or 60 to 95% by weight of the first PCT resin, and 5 to 50% by weight or 5 to 40% by weight of the second PCT resin to the total resin contained in the resin composition Weight. When the content of the first PCT resin and the second PCT resin is within this range, it is possible to have both excellent moldability and tensile properties at the same time.

The first PCT resin and the second PCT resin can be prepared by polymerization of a specific monomer to have the above characteristics.

For example, a first PCT resin having a higher melting point and a lower viscosity can pass through a 1,4-cyclohexane having a higher trans-isomer ratio than a second PCT resin. Esterification of methanol (1,4-cyclohexanedimethanol) with terephthalic acid, or by 1,4-cyclohexanedimethanol and p-benzene with a higher ratio of trans isomers The transesterification of a formic acid ester compound is prepared.

The commonly used 1,4-cyclohexanedimethanol comprises 70 mole percent (mol%) of the trans isomer and the remaining cis-isomer. The content of the cis isomer and the trans isomer of 1,4-cyclohexanedimethanol can be changed by homoisomerization of 1,4-cyclohexanedimethanol using a catalyst.

The first PCT resin polymerized using 1,4-cyclohexanedimethanol having a trans isomer ratio of 73 mol% or more or 75 mol% or more has high melting point and heat resistance, and may have high crystallinity.

According to another example, the second PCT resin having a lower melting point and a higher viscosity may be less than or equal to 70 mol% or less than or equal to 60 mol% of the trans-isomer ratio as compared to the first PCT resin. Prepared by esterification of 1,4-cyclohexanedimethanol with terephthalic acid, or by a ratio of trans isomers of less than or equal to 70 mol% or less than or equal to 60 mol The transesterification of 1,4-cyclohexanedimethanol with terephthalate was prepared.

According to another example, the second PCT resin can be prepared by adding a copolymerizable monomer to the esterification or transesterification reaction. The copolymerizable monomer may be one or more comonomers selected from the group consisting of isophthalic acid, isophthalic acid ester compound having a molecular weight of between 100 and 3000. In the group consisting of ethylene glycol (EG), 1,3-propanediol, 1,4-butanediol, and polypropylene glycol . Here, the total amount of isophthalic acid used may be less than or equal to 15 mol% or less than or equal to 10 mol% based on the entire dicarboxylic acids. The total amount of the isophthalate compound used may be less than or equal to 15 mol% or less than or equal to 10 mol% based on the entire dicarboxylate compound. In addition, it is selected from the group consisting of isophthalic acid, isophthalic acid ester compound, ethylene glycol (EG), and 1,3-molecular weight between 100 and 3000. The total amount of one or more comonomers used in the group consisting of 1,3-propanediol, 1,4-butanediol, and polypropylene glycol may be less than Or equal to 15 mol% or less than or equal to 10 mol% based on the entire diol compounds.

The second PCT resin can be made to have a high molecular weight to ensure superior tensile properties. For example, the second PCT resin can have a number average molecular weight of between 15,000 grams per mole (g/mol) and 45,000 grams per mole. For the preparation of high molecular weight The second PCT resin may be subjected to a step of preparing the reactant into a pellet after the esterification reaction or the transesterification reaction of the monomer and/or crystallizing the reactant or the particulate matter and solid-state polymerization (solid-state) Polymerizing) a reactant or granule.

However, the preparation methods of the first and second PCT resins are not limited to the above, and in addition to the above methods, other different methods known in the art to which the present invention pertains may be used as long as the first and second PCT resins have the above-described Characteristics.

The resin composition may further comprise an additive for reinforcing or enhancing the properties of the PCT resin in the art to which the present invention pertains. For example, the composition may include one or more additives selected from a filler, a pigment, an oxidation stabilizer, a lubricant, a reinforcing agent. And a group consisting of a nucleating agent.

For example, the filler may be glass fiber, carbon fiber, boron fiber, glass bead, glass flake, talc, carbon black ( Carbon black), clay, mica, wollastonite, calcium titanate whisker, aluminum boric acid whisker, zinc oxide whisker, Calcium whisker or a mixture of the above. Among them, the acicular filler can be used as a filler for preparing an article having a good surface smoothness. In particular, glass fibers, strontium ore, calcium titanate whiskers, aluminum borate whiskers or mixtures of the foregoing may be used as fillers for providing articles which are preferred for surface smoothness and whiteness. Moreover, the formability of the composition and physical properties of the article, such as tensile strength, flexural strength and bending coefficient, and heat resistance, for example, heat deflection temperature can be improved by using glass fibers.

When the glass fiber is used as a filler, the glass fiber may be in the form of a filament, a thread, a fiber or a whisker. Also, the glass fibers may have an average length of 0.1 to 20 millimeters (mm), 0.3 to 10 mm, or 3 to 5 mm. Further, the aspect ratio of the glass fibers (the average length L of the fibers / the average diameter D of the fibers) may be from 10 to 2,000 or from 30 to 1,000 to provide a resin composition having superior physical strength.

When the acicular filler is used as a filler, a plate-type filler such as mica or glass fiber may be added to avoid deformation of the sample formed by the injection molding of the resin composition.

The pigment may, for example, be titanium oxide, zinc oxide, zinc sulfide, zinc sulfate, barium sulfate, lithopone (BaSO ₄ .ZnS), white lead white Lead (2PbCO ₃ .Pb(OH) ₂ ), calcium carbonate, alumina, boron nitride or a mixture thereof. Further, the antioxidant may be a hindered phenol-based antioxidant such as AO-60 of ADEKA Corporation, and the like.

The lubricant can be stably dispersed in the resin composition with a pigment or the like using a lubricant, and the resin composition can be easily released from the mold. The lubricant may be, for example, N, N'-ethylene bis, stearamide or the like.

The reinforcing agent can improve the tensile strength by providing a hard property of the resin composition. The reinforcing agent may, for example, be a random terpolymer obtained by polymerizing ethylene, acrylic acid ester and glycidyl methacrylate under high pressure. .

The nucleating agent serves as a crystallized crystal nucleus, and the crystallization rate of the resin composition can be improved at the time of injection molding of the resin composition. The nucleating agent can be, for example, the sodium salt of montanic acid (Licomont NaV101 from Clariant) and analogs thereof.

The amount of the additive can be appropriately controlled depending on the characteristics of the resin composition to be obtained. For example, when the content of the additive is from 20 to 60 parts by weight, the physical strength and processability of the first and second PCT resins can be further improved by the weight per 100 parts of the total resin.

The first and second PCT resins contained in the resin composition and any necessary additives added thereto may be uniformly mixed, for example, by using a twin screw extruder.

Since the resin composition includes two PCT resins which are combined and have different melting points, superior tensile properties can be exhibited with excellent injection molding characteristics.

Moreover, according to another embodiment of the present invention, the present invention further provides a trans-paraben An article formed by an acid cyclohexane dimethanol ester resin composition. Since the method of preparing an article using the resin composition is well known in the art to which the present invention pertains, it will not be described in detail herein.

The article can be easily prepared from a resin composition including the first and second PCT resins, and can exhibit good physical properties.

In the following, preferred examples of the invention will be explained in detail. However, the examples are only intended to illustrate the invention and are not intended to limit the scope of the invention.

Example 1: Preparation of PCT Resin A-1 with High Melting Point

55 kg (kg) of 1,4-cyclohexanedimethanol (CHDM) containing 75 mol% of the trans isomer, 48 kg of terephthalic acid (TPA), 7 g of triethyl phosphate, A 10 gram titanium oxide catalyst (trade name: Hombifast PC ^{® from} Sachtleben, effective Ti ratio in the catalyst: 15%) was added to the reactor. Next, the temperature of the reaction was raised to about 280 ° C, and an esterification reaction was carried out at a temperature of about 280 ° C under normal pressure for about 3 hours.

Then, the product obtained by the esterification reaction is subjected to a polycondensation reaction at a temperature of about 295 ° C and a pressure of 0.5 to 1 torr for about 150 minutes to obtain a PCT resin having a viscosity of 0.65 dL / g.

The PCT resin was dissolved in 2-chlorophenol at a concentration of 1.2 g/dL and measured using a Ubbelohde viscometer. The temperature of the viscometer was maintained at 35 ° C and the efflux time (t) of the solvent flowing through the interior a-b of the viscometer and the time (t0) of the solution flowing through the internal a-b were measured. Then, the specific viscosity is calculated by substituting the substitution t value and the t0 value in Formula 1, and the intrinsic viscosity is calculated by substituting the specific viscosity in Formula 2.

In Formula 2, A represents a Huggins constant with a value of 0.247, and c represents a concentration. Its value is 1.2 g/dL.

Example 2: Preparation of PCT Resin A-2 with High Melting Point

55 kg of 1,4-cyclohexanedimethanol (CHDM) containing 75 mol% of the trans isomer, 48 kg of terephthalic acid (TPA), 7 g of triethyl phosphate, 10 g of titanium oxide catalyst ( Sachtleben's trade name: Hombifast PC ^® , effective Ti ratio in the catalyst: 15%) is added to the reactor. Next, the temperature of the reaction was raised to about 280 ° C, and an esterification reaction was carried out at a temperature of about 280 ° C under normal pressure for about 3 hours.

Then, the product obtained by the esterification reaction is subjected to a polycondensation reaction at a temperature of about 295 ° C and a pressure of 0.5 to 1 torr for about 150 minutes to obtain a PCT resin. Also, the PCT resin is pelletized by a granulation process. Subsequently, the PCT resin pellets were placed at a temperature of 250 ° C under vacuum for about 15 hours to obtain a PCT resin (A-2) having a viscosity of 0.80 dL / g.

Example 3: Preparation of PCT Resin B-1 with Low Melting Point

55 kg of 1,4-cyclohexanedimethanol (CHDM) containing 70 mol% of the trans isomer, 43 kg of terephthalic acid (TPA), 5 kg of isophthalic acid (IPA), and 7 g of phosphoric acid Ethyl ester, 40 g of a titanium oxide catalyst (trade name: Hombifast PC ^{® from} Sachtleben, effective Ti ratio in the catalyst: 15%) was added to the reactor. Next, the temperature of the reaction was raised to about 280 ° C, and an esterification reaction was carried out at a temperature of about 280 ° C under normal pressure for about 3 hours.

Then, the product obtained by the esterification reaction is subjected to a polycondensation reaction at a temperature of about 295 ° C and a pressure of 0.5 to 1 torr for about 150 minutes to obtain a PCT resin. Also, the PCT resin is pelletized by a granulation process. Subsequently, the PCT resin pellets were subjected to solid state polymerization to obtain a PCT resin (B-1) having an increased molecular weight.

Example 4: Preparation of PCT Resin B-2 with Low Melting Point

50 kg of 1,4-cyclohexanedimethanol (CHDM) containing 70 mol% of the trans isomer, 2.4 kg of ethylene glycol (EG), 48 kg of terephthalic acid (TPA), 7 g Triethyl phosphate, 40 g of a titanium oxide catalyst (trade name: Hombifast PC ^{® from} Sachtleben, effective Ti ratio in the catalyst: 15%) was added to the reactor. Next, the temperature of the reaction was raised to about 280 ° C, and an esterification reaction was carried out at a temperature of about 280 ° C under normal pressure for about 3 hours.

Then, the product obtained by the esterification reaction is subjected to a polycondensation reaction at a temperature of about 295 ° C and a pressure of 0.5 to 1 torr for about 150 minutes to obtain a PCT resin. Also, the PCT resin is pelletized by a granulation process. Subsequently, the PCT resin pellets were subjected to solid state polymerization to obtain a PCT resin (B-2) having an increased molecular weight.

Example 5: Preparation of PCT Resin B-3 with Low Melting Point

PCT resin was prepared in the same manner as described in Example 4 except that 2.4 kg of ethylene glycol (EG) of Example 4 was replaced with 2.9 kg of 1,3-propanediol (PDO). (B-3).

Example 6: Preparation of PCT Resin B-4 with Low Melting Point

The 2.4 of Example 4 was replaced by using 52.25 kg of 1,4-cyclohexanedimethanol (CHDM) containing 70 mol% of the trans isomer and 2.9 kg of polypropylene glycol having a number average molecular weight of 1000 g/mol. A PCT resin (B-4) was obtained by the same method as described in Example 4 except for kilograms of ethylene glycol (EG).

Example 7: Preparation of PCT Resin B-5 with Low Melting Point

55 kg of 1,4-cyclohexanedimethanol (CHDM) containing 40 mol% of the cis isomer, 48 kg of terephthalic acid (TPA), 7 g of triethyl phosphate, 40 g of titanium oxide catalyst ( Sachtleben's trade name: Hombifast PC ^® , effective Ti ratio in the catalyst: 15%) is added to the reactor. Next, the temperature of the reaction was raised to about 280 ° C, and an esterification reaction was carried out at a temperature of about 280 ° C under normal pressure for about 3 hours.

Then, the product obtained by the esterification reaction is subjected to a polycondensation reaction at a temperature of about 295 ° C and a pressure of 0.5 to 1 torr for about 150 minutes to obtain a PCT resin. Also, the PCT resin is pelletized by a granulation process. Subsequently, the PCT resin pellets were subjected to solid state polymerization to obtain a PCT resin (B-5) having an increased molecular weight.

Example 8: Preparation of PCT Resin B-6 with Low Melting Point

In place of 55 kg of 55 kg of 1,4-cyclohexane containing 40 mol% of the cis isomer, substituted with 55 kg of 1,4-cyclohexanedimethanol (CHDM) containing 50 mol% of the trans isomer. A PCT resin (B-6) was obtained by the same method as described in Example 7 except methanol (CHDM).

The raw materials, intrinsic viscosity and melting point of the PCT resin prepared by Preparation Examples 1 to 8 are shown in Table 1 below.

TPA: terephthalic acid

IPA: isophthalic acid

CHDM: 1,4-cyclohexane dimethanol

Content of cis isomer: content of cis isomer in 1,4-cyclohexanedimethanol (CHDM).

EG: ethylene glycol

PDO: 1,3-propanediol

Polyol: polypropylene glycol having a number average molecular weight of 1000 g/mol

Examples 1 to 18 and Comparative Examples 1 and 2: Preparation of PCT resin composition

Glass fiber, antioxidant (AO-60 from ADEKA), and lubricant (Hi-Lube from Sinwon Chemical Co.) were mixed with one or both of the PCT resins disclosed in Table 2 below, and a twin-screw extruder was used. (Φ: 40 mm, L/D = 44).

The granules were placed in an injection molding machine heated to about 295 ° C to be melted, and then the molten resin composition was injected into a tensile test sample mold of ASTM at a temperature of 150 ° C to prepare for evaluation of physics. Sample of characteristics.

Examples 19 to 24: Preparation of PCT resin compositions

30 parts by weight of glass fiber, 0.2 parts by weight of antioxidant (AO-60 of ADEKA), and 0.2 parts by weight of lubricant (Hi-Sinwon Chemical Co.) per 100 parts by weight of PCT resin Lube) was mixed with the two PCT resins disclosed in Table 3 below, and then further added 4 parts by weight of the first additive (Arkema's AX8900) and second additive (Clariant's Licomont NaV101) as disclosed in Table 3. Mix with the above product. Then, the mixture was uniformly kneaded using a twin-screw extruder (Φ: 40 mm, L/D = 44), and extruded into pellets.

Next, the granules were placed in an injection molding machine heated to about 295 ° C to be melted, and then the molten resin composition was injected into a tensile test sample mold of ASTM at a temperature of 150 ° C to prepare for use. A sample for evaluating physical properties.

Experimental Example: Evaluation of Characteristics of PCT Resin Compositions

The characteristics of the PCT resin compositions obtained from Examples 1 to 24 and Comparative Examples 1 to 2 were measured by the following methods, and the results are shown in Table 4.

(1) Shortest cooling time: Samples of Preparation Examples 1 to 24 and Comparative Examples 1 to 2 During the process, the composition injected into the tensile test sample mold of ASTM is measured for the shortest time (i.e., injection cooling time) that is solidified and stably separated from the mold.

(2) Injection pressure: The pellets obtained in Examples 1 to 24 and Comparative Examples 1 to 2 were respectively placed into the molding machine, and the amount of the molten resin composition was injected into the mold and filled up to prepare a sample. The maximum pressure of the resulting molten resin composition was measured. When the flowability of the molten composition is good, a lower injection pressure can be measured.

(3) Tensile strength and elongation: It was measured in accordance with the method of ASTM D638.

(4) Impact strength: It was measured in a cantilever beam notch according to the method of ASTM D256 at a temperature of 25 ° C, and the thickness of the sample was 1/8 inch.

As can be seen from Table 4, it can be confirmed that Examples 1 to 24 have similar injection cooling time and ejection pressure as Comparative Examples 1 to 2, and Examples 1 to 24 can provide improved tensile strength as compared with Comparative Examples 1 to 2. Objects with elongation and impact strength.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

Claims (8)

A polybutylene terephthalate dimethanol ester resin composition comprising: a first poly(cyclohexanedimethylene terephthalate) resin, the first poly(cyclohexanedimethylene terephthalate) resin The melting point of the crystal is greater than or equal to 295 ° C, and the first poly(cyclohexanedimethylene terephthalate resin) has an intrinsic viscosity of less than or equal to 0.75 dL / g; and a second poly(cyclohexanedimethylene terephthalate) a resin, the second polybutylene terephthalate dimethanol ester resin has a crystal melting point of less than or equal to 280 ° C, and the second poly(cyclohexanedimethylene terephthalate) resin has an intrinsic viscosity greater than or equal to 0.75 dL. /g. The poly(cyclohexanedimethylene terephthalate) resin composition according to claim 1, comprising 50 to 95% by weight of the first poly(cyclohexanedimethylene terephthalate) resin, and 5 Up to 50% by weight of the second poly(cyclohexanedimethylene terephthalate) resin, based on the weight of the total resin. The poly(cyclohexanedimethylene terephthalate) resin composition according to claim 1, wherein the first poly(cyclohexanedimethylene terephthalate) resin is a trans isomer ratio. A resin obtained by polymerizing cyclohexanedimethanol of 73 mol% or more. The poly(cyclohexanedimethylene terephthalate) resin composition according to claim 1, wherein the second poly(cyclohexanedimethylene terephthalate) resin is a trans isomer ratio. A resin obtained by polymerizing cyclohexanedimethanol of less than or equal to 70 mole percent. The poly(cyclohexanedimethylene terephthalate) resin composition according to claim 1, wherein the second poly(cyclohexanedimethylene terephthalate) resin is one or more copolymerized by using one or more copolymers. a resin obtained by polymerizing monomers, and the one or more copolymerization system is selected from the group consisting of phthalic acid, isophthalate compound, ethylene glycol, 1, 3 having a molecular weight of between 100 and 3000 -propylene glycol, 1,4- A group consisting of butanediol and polypropylene glycol. The poly(cyclohexanedimethylene terephthalate) resin composition according to claim 1, further comprising one or more additives selected from the group consisting of a filler, a pigment, a oxidative stabilizer, and a lubricant. , a reinforcing agent and a group of nucleating agents. The poly(cyclohexanedimethylene terephthalate) resin composition according to claim 6, wherein the additive is contained in an amount of from 20 to 60 parts by weight per 100 parts by weight of the total resin. An article made of a polybutylene terephthalate resin composition as described in claim 1 of the patent application.