KR101304475B1 - Polyester copolymer for fabricating thin and elongated hollow articles - Google Patents
Polyester copolymer for fabricating thin and elongated hollow articles Download PDFInfo
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- KR101304475B1 KR101304475B1 KR1020060094065A KR20060094065A KR101304475B1 KR 101304475 B1 KR101304475 B1 KR 101304475B1 KR 1020060094065 A KR1020060094065 A KR 1020060094065A KR 20060094065 A KR20060094065 A KR 20060094065A KR 101304475 B1 KR101304475 B1 KR 101304475B1
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- 229920000728 polyester Polymers 0.000 title abstract 3
- 229920001225 polyester resin Polymers 0.000 claims abstract description 12
- 239000004645 polyester resin Substances 0.000 claims abstract description 12
- 229920000139 polyethylene terephthalate Polymers 0.000 claims abstract description 10
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 10
- 238000001746 injection moulding Methods 0.000 claims abstract description 8
- -1 polyethylene terephthalate Polymers 0.000 claims abstract description 8
- JVUAGOBFIHGRCI-UHFFFAOYSA-N 1,4-dimethylidenecyclohexane;terephthalic acid Chemical compound C=C1CCC(=C)CC1.OC(=O)C1=CC=C(C(O)=O)C=C1 JVUAGOBFIHGRCI-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000007334 copolymerization reaction Methods 0.000 claims description 17
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 10
- 239000000155 melt Substances 0.000 claims description 10
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 8
- BXGYYDRIMBPOMN-UHFFFAOYSA-N 2-(hydroxymethoxy)ethoxymethanol Chemical compound OCOCCOCO BXGYYDRIMBPOMN-UHFFFAOYSA-N 0.000 claims 1
- YIMQCDZDWXUDCA-UHFFFAOYSA-N [4-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCC(CO)CC1 YIMQCDZDWXUDCA-UHFFFAOYSA-N 0.000 abstract description 3
- 229920001577 copolymer Polymers 0.000 abstract 2
- 229920005989 resin Polymers 0.000 description 13
- 239000011347 resin Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 229920001634 Copolyester Polymers 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000002009 diols Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- JPBHXVRMWGWSMX-UHFFFAOYSA-N 1,4-dimethylidenecyclohexane Chemical compound C=C1CCC(=C)CC1 JPBHXVRMWGWSMX-UHFFFAOYSA-N 0.000 description 1
- ORLQHILJRHBSAY-UHFFFAOYSA-N [1-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1(CO)CCCCC1 ORLQHILJRHBSAY-UHFFFAOYSA-N 0.000 description 1
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- QYQADNCHXSEGJT-UHFFFAOYSA-N cyclohexane-1,1-dicarboxylate;hydron Chemical compound OC(=O)C1(C(O)=O)CCCCC1 QYQADNCHXSEGJT-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- ULWHHBHJGPPBCO-UHFFFAOYSA-N propane-1,1-diol Chemical compound CCC(O)O ULWHHBHJGPPBCO-UHFFFAOYSA-N 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyesters Or Polycarbonates (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
본 발명은 폴리에틸렌테레프탈레이트 구성단위와 폴리1,4-디메틸렌사이클로헥산테레프탈레이트를 위주로 하는 구성단위로 이루어지는 공중합 폴리에스테르 수지에 관한 것으로, 본 발명의 공중합 폴리에스테르는 길이(L)/벽두께(t)의 비가 50 이상이고, 성형체의 길이(L)/중공개구부의 폭(w)의 비가 6 이상의 치수를 갖는 얇고 긴 중공성형체의 사출성형에 매우 적합한 특성을 나타낸다.The present invention relates to a copolymer polyester resin comprising a polyethylene terephthalate structural unit and a structural unit mainly based on poly 1,4-dimethylene cyclohexane terephthalate, wherein the copolymer polyester of the present invention has a length (L) / wall thickness ( The ratio of t) is 50 or more, and the ratio of the length (L) of the molded part to the width (w) of the hollow opening is very suitable for injection molding of a thin and long hollow molded product having a dimension of 6 or more.
폴리에스테르, 1,4-사이클로헥산디메탄올, 폴리에틸렌테레프탈레이트, 폴리1,4-디메틸렌사이클로헥산테레프탈레이트 Polyester, 1, 4-cyclohexane dimethanol, polyethylene terephthalate, poly 1, 4- dimethylene cyclohexane terephthalate
Description
도 1은 본 발명의 일 구현에 따르는 얇고 긴 사각기둥형태의 중공성형체의 정면과 측면을 나타낸 도면이고, 1 is a view showing the front and side surfaces of a thin and long rectangular pillar-shaped hollow molded body according to an embodiment of the present invention,
도 2는 본 발명의 다른 구현에 따르는 얇고 긴 사각기둥형태의 중공성형체의 정면과 측면을 나타낸 도면이다. Figure 2 is a view showing the front and side of the hollow molded body of the thin long square pillar shape according to another embodiment of the present invention.
본 발명은 폴리에스테르수지에 관한 것으로서, 보다 구체적으로는 얇고 긴 중공성형체를 사출성형하여 제조하기에 적합한 폴리에스테르 수지에 관한 것이다. The present invention relates to a polyester resin, and more particularly, to a polyester resin suitable for injection molding a thin and long hollow molded article.
사출용도로 사용되는 투명수지로는 폴리스티렌(PS), 폴리메틸메타크릴레이트(PMMA), 폴리카보네이트(PC) 등이 널리 사용되고 있다. Polystyrene (PS), polymethyl methacrylate (PMMA), polycarbonate (PC) and the like are widely used as transparent resins used for injection purposes.
폴리스티렌은 가격은 싸나 충격강도가 약하고, 폴리카보네이트는 물성은 우수하나 가격이 비싼 것이 단점이다. 폴리에틸렌테레트탈레이트(PET)는 종래의 사출 용 투명수지들의 장점을 골고루 지녔고 재활용(Recycle)이 잘 된다는 점에서 사출수지로 적합하다고 할 수 있다. 그러나, 대부분의 사출용 투명수지들은 무정형(amorphous)이나 PET는 결정성(crystallinity)을 가지고 있으므로 냉각금형을 써야 하기 때문에 금형내에서의 흐름성이 매우 제한을 받는다.Polystyrene is inexpensive but weak in impact strength, and polycarbonate has excellent physical properties but is expensive. Polyethylene terephthalate (PET) has the advantages of the conventional transparent resin for injection and can be said to be suitable as an injection resin in terms of good recycling (Recycle). However, most of the injection-transparent resins are amorphous or PET has crystallinity, so the flow in the mold is very limited because the cooling mold must be used.
이러한 문제를 해결하기 위해 폴리에틸렌테레프탈레이트 수지의 결정성을 떨어뜨리기 위해 다른 산성분과 디올성분을 공중합시켜 폴리에스테르 수지의 특성을 개질하는 것이 연구되어 왔다. 이와 같은 공중합폴리에스테르 수지를 제조하는데 사용되는 산성분으로는 이소프탈산, 사이클로헥산디카르복실산트, 나프탈렌디카르복실산 등이 있으며, 디올성분으로는 네오펜틸글리콜, 프로판디올, 부탄디올, 사이클로헥산디메탄올 등이 있다. In order to solve this problem, in order to reduce the crystallinity of polyethylene terephthalate resin, copolymerization of diol components with other acid components has been studied to modify the properties of polyester resins. Acid components used to prepare such copolymerized polyester resins include isophthalic acid, cyclohexanedicarboxylic acid, naphthalenedicarboxylic acid, and the like. As diol components, neopentyl glycol, propanediol, butanediol, and cyclohexanedi Methanol and the like.
그러나, 공지의 공중합 폴리에스테르 수지로는 본 발명에서 목적하는 특정 구조의 얇고 긴 모양의 중공성형체를 사출성형하는 것은 매우 곤란하였다. However, it is very difficult to injection mold a thin and long hollow molded article having a specific structure desired by the present invention with a known copolyester resin.
따라서 본 발명은 특정 구조의 얇고 긴 모양의 중공성형체를 제조하기에 적합한 공중합 폴리에스테르 수지를 제공하는 것을 목적으로 한다. Accordingly, an object of the present invention is to provide a copolyester resin suitable for producing a thin and elongated hollow molded article having a specific structure.
상기한 목적을 달성하기 위한 본 발명자의 연구에서 특정 공중합성분을 사용하여 공중합도를 특정수준으로 조절하고, 공중합 생성물의 용융지수를 특정한 범위로 조절하게 되면 목적하는 용도에 매우 적합한 공중합 수지를 얻을 수 있게 된다는 사실을 발견하고, 이러한 사실에 기초하여 본 발명을 완성하게 된 것이다. In the study of the present inventors to achieve the above object, by adjusting the degree of copolymerization to a specific level by using a specific copolymerization component, and adjusting the melt index of the copolymerization product to a specific range can obtain a copolymer resin very suitable for the intended use. It was found that the present invention, and based on this fact, the present invention was completed.
그러므로 본 발명에 의하면 폴리에틸렌테레프탈레이트 구성단위와 폴리1,4-디메틸렌사이클로헥산테레프탈레이트를 위주로 하는 구성단위로 이루어지는 얇고 긴 모양의 중공성형체를 사출하여 제조하기 위한 공중합 폴리에스테르 수지이며, 개질을 위한 공중합 성분은 1,4-사이클로헥산디메탄올, 디에틸렌글리콜 및 이소프탈산이고, 하기 수학식 1로 구한 개질성분의 공중합도가 3~15%이고, 용융지수(MI: melt index)가 20~40g/10min (270℃,추 무게 : 2106g)이고, 상기 중공성형체는 성형체의 길이(L)/벽두께(t)의 비가 50 이상이고, 성형체의 길이(L)/중공개구부의 폭(w)의 비가 6 이상의 치수를 갖는 것임을 특징으로 하는 얇고 긴 중공성형체용 공중합 폴리에스테르 수지가 제공된다: Therefore, according to the present invention is a co-polyester resin for injection molding a thin and long hollow molded body consisting of a polyethylene terephthalate structural unit and a structural unit mainly poly 1,4-dimethylene cyclohexane terephthalate, for modification The copolymerization component is 1,4-cyclohexanedimethanol, diethylene glycol and isophthalic acid, the copolymerization degree of the modified component obtained by Equation 1 below is 3 to 15%, and the melt index (MI: melt index) is 20 to 40 g. / 10min (270 DEG C, weight: 2106 g), and the blow molded body has a ratio of length L / wall thickness t of the molded body to 50 or more, and length L of the molded body / width w of the hollow opening. There is provided a co-polyester resin for thin and long blown bodies, characterized in that the ratio has a dimension of 6 or more:
이하, 본 발명을 보다 상세하게 설명하기로 한다. Hereinafter, the present invention will be described in more detail.
본 발명에서 목적하는 중공성형체는 성형체의 길이(L)/벽두께(t)의 비가 50 이상이고, 성형체의 길이(L)/중공개구부의 폭(w)의 비가 6 이상의 치수를 갖는 것이다. 이러한 치수를 갖는 중공성형체의 예가 도 1 및 도 2에 예시된다. 도 1은 사각 기둥형태의 중공성형체를, 도 2는 원기둥형태의 중공성형체를 각각 나타낸 것이다. The hollow molded article desired in the present invention has a length L / wall thickness t of the molded article of 50 or more, and a length L of the molded article / width w of the hollow opening portion has a dimension of 6 or more. Examples of blow molded bodies having such dimensions are illustrated in FIGS. 1 and 2. 1 shows a hollow molded body in the form of a square column, and FIG. 2 shows a hollow molded body in the form of a cylinder.
본 발명의 공중합 폴리에스테르 수지에 있어서, 개질을 위한 공중합 성분으로는 1,4-사이클로헥산디메탄올, 디에틸렌글리콜 및 이소프탈산이 사용되며, 이러한 공중합 성분의 수학식 1로 계산한 공중합도는 3~15%가 되어야 한다. 만일 상기 공중합도가 3%보다 낮은 경우에는 사출성형시 투명한 성형체를 제조하기 어렵고, 공중합도가 15%를 초과하는 경우에는 수지의 결정화도가 낮아 수지제조 및 건조시에 융착이 심하게 발생하는 문제점이 있다. In the copolymerized polyester resin of the present invention, 1,4-cyclohexanedimethanol, diethylene glycol and isophthalic acid are used as copolymerization components for modification, and the copolymerization degree calculated by Equation 1 of these copolymerization components is 3 Should be ~ 15%. If the copolymerization degree is lower than 3%, it is difficult to produce a transparent molded article during injection molding, and when the copolymerization degree is more than 15%, there is a problem in that fusion occurs severely during resin production and drying when the copolymerization degree is lower than 15%. .
또한 본 발명의 공중합 폴리에스테르 수지의 용융지수는 20~40g/10min (270℃,추 무게 : 2106g)이어야 한다. 그 이유는 용융지수가 20 g/10min보다 낮은 경우에는 사출시 사출압력이 많이 걸려 공정불량 및 설비부품의 수명이 짧아지는 단점이 있고, 40g/10min을 초과하는 경우에는 중공성형체의 기계적 강도가 매우 저하되는 문제점이 있기 때문이다. In addition, the melt index of the copolyester resin of the present invention should be 20 ~ 40g / 10min (270 ℃, weight: 2106g). The reason is that when the melt index is lower than 20 g / 10min, the injection pressure is high during injection, which shortens the process defect and the life of the equipment parts. When the melt index exceeds 40g / 10min, the mechanical strength of the hollow molded product is very high. This is because there is a problem that is degraded.
이하, 실시예의 방법으로 본 발명을 보다 상세하게 설명하기로 한다. Hereinafter, the present invention will be described in more detail by way of examples.
하기 표 1에 나타낸 바와 같은 용융지수와 개질제의 공중합도를 가지는 폴리에틸렌테레프탈레이트 구성단위와 폴리-1,4-디메틸렌사이클로헥산테레프탈레이트를 위주로 하는 구성단위로 이루어지는 공중합 폴리에스테르 수지를 160℃에서 12시간 진공 건조하여 준비하였다. 길이*폭*두께가 각각 100*12*1.2mm, 100*12*2.1mm, 100*18*1.2mm인 납작한 중공 직육면체의 성형체의 사출을 사출기는 NISSEI의 FN2000을 사용하였고, 금형 냉각온도는 12℃로 하였고, 사출기 부위별 온도는 노즐/배럴1/배럴2/배럴3=270/275/275/275℃로 동일하게 하여 사출하면서 성형체의 투명 도가 좋아질 때까지 냉각시간을 변경하면서 최소의 냉각시간을 기록하였고, 성형체의 모양이 불균일하게 나오거나 금형에 성형체가 박히는 경우의 공정불량 횟수를 비교하였다. 그 결과는 표 1에 제시된다. The copolymerized polyester resin comprising a polyethylene terephthalate structural unit having a copolymerization degree of a melt index and a modifier and a structural unit mainly based on poly-1,4-dimethylene cyclohexane terephthalate as shown in Table 1 was 12 at 160 ° C. Prepared by time vacuum drying. NISSEI's FN2000 was used for injection molding of flat, hollow cuboids of 100 * 12 * 1.2mm, 100 * 12 * 2.1mm, and 100 * 18 * 1.2mm in length, width, and thickness, respectively. ℃, and the temperature of each part of the injection machine nozzle / barrel 1 / barrel 2 / barrel 3 = 270/275/275/275 ℃ equal to the minimum cooling time while changing the cooling time to improve the transparency of the molded product It was recorded, and compared the number of process defects when the shape of the molded product came out unevenly or the molded body is stuck in the mold. The results are shown in Table 1.
(MI)Melt Index
(MI)
(%)Degree of copolymerization
(%)
L / t
(초)Molding cycle time
(second)
(100 shot 당)Process Defect Occurrences
(Per 100 shots)
상기 표 1에서 성형사이클 시간은 사출시간과, 냉각시간과, 이젝트(eject)시간을 합친 시간을 의미한다. 또한 용융지수는 ASTM D1238-B방법에 의거하여 실시하였다(측정설비는 Davenport사의 LLOYD MFI-10). In Table 1, the molding cycle time means a time in which injection time, cooling time, and eject time are added together. In addition, the melt index was performed according to the ASTM D1238-B method (measurement equipment is Davenport's LLOYD MFI-10).
상기 표 1의 결과로부터, 용융지수가 20~40g/10min의 범위내이고 개질제의 공중합도가 3~15%의 범위내인 실시예 1 내지 3의 본 발명의 공중합 폴리에스테르 수지는 본 발명에 따르는 치수의 얇고 긴 성형체를 사출성형하더라도 공정불량이 거의 발생하지 않으나, 용융지수가 본 발명의 범위에서 벗어나는 비교예 1이나, 공중합도가 본 발명의 범위에서 벗어나는 비교예 2의 경우에는 공정불량이 자주 발생하는 것을 알 수 있다. 특히, 비교예 3, 4는 본 발명에 따르는 성형체와 같이 흐름성의 제약이 많은 성형체의 사출성형에서 본 발명의 수지가 매우 탁월함을 간접적으로 말해주고 있다.From the results in Table 1, the copolymerized polyester resins of the present invention of Examples 1 to 3, wherein the melt index is in the range of 20 to 40 g / 10 min and the copolymerization degree of the modifier is in the range of 3 to 15%, according to the present invention. Process injection hardly occurs even when injection molding thin and long molded articles having dimensions, but in case of Comparative Example 1 in which the melt index is out of the range of the present invention, and Comparative Example 2 in which the copolymerization degree is out of the range of the present invention, the process defect is frequently It can be seen that it occurs. In particular, Comparative Examples 3 and 4 indirectly indicate that the resin of the present invention is very excellent in the injection molding of a molded article having a high flowability such as the molded article according to the present invention.
이와 같이 본 발명에 따르는 공중합 폴리에스테르 수지는 얇고 긴 성형체, 구체적으로 성형체의 길이(L)/벽두께(t)의 비가 50 이상이고, 성형체의 길이(L)/중공개구부의 폭(w)의 비가 6 이상의 치수를 만족하는 성형체의 제조에 매우 적합한 수지이며 종래 폴리에틸렌테레프탈레이트 수지의 단점을 해소할 수 있는 등의 효과가 있는 것이다.As described above, the copolyester resin according to the present invention has a thin and long molded article, specifically, the ratio of the length (L) / wall thickness (t) of the molded article is 50 or more, and the length (L) of the molded article / width of the hollow opening part (w). It is a resin that is very suitable for the production of molded articles having a ratio satisfying a dimension of 6 or more, and has the effect of eliminating the disadvantages of the conventional polyethylene terephthalate resin.
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