34 results about "Polyethylene naphthalate" patented technology

The present invention provides a PET / PBT composite material and a preparation method thereof, and relates to the field of polymer composite materials, the PET / PBT composite material comprises the following raw materials by weight: 30-50 parts of PBT resin; 20 to 40 parts of PET resin; 10 to 20 parts of polyethylene naphthalate; 5 to 15 parts of modified nano aromatic amide fiber; 8 to 15 parts of ethylene-methacrylic acid copolymer neutralized by metal ions; 3-8 parts of a compatilizer; 0.3 to 1 part of an antioxidant; and 0.5 to 1.5 parts of a lubricant. The modified nano aromatic amide fiber provides rigidity, the ionic polymer provides toughness, the modified nano aromatic amide fiber and the ionic polymer are combined, the fiber serves as a rigid framework to bear main loads, and the ionic polymer distributed on the interface of the fiber and a matrix efficiently dissipates impact energy and prevents crack propagation through reversible fracture of dynamic bonds of the ionic polymer. Meanwhile, high strength, high modulus, ultrahigh toughness and high heat resistance are realized.

An optically anisotropic polymer thin film includes a crystallizable polymer and an additive configured to interact with the polymer (e.g., via π-π interactions) to facilitate chain alignment and, in some examples, create a higher crystalline content within the polymer thin film. The polymer thin film may be characterized by a bimodal molecular weight distribution where the molecular weight of the additive may be less than approximately 50% of the molecular weight of the crystallizable polymer. Example crystallizable polymers include polyethylene naphthalate, polyethylene terephthalate, polybutylene naphthalate, polybutylene terephthalate, as well as derivatives thereof. Example additives, which may occupy up to approximately 10 wt. % of the polymer thin film, include aromatic ester oligomers, aromatic amide oligomers, and polycyclic aromatic hydrocarbons, for example. The optically anisotropic polymer thin film may be characterized by a refractive index greater than approximately 1.7 and an in-plane birefringence greater than approximately 0.2.

The present application relates to a kind of high barrier bottle grade polyester and its preparation method, belong to polyester technical field.The high barrier bottle grade polyester includes polyethylene terephthalate, polyethylene naphthalate, composite nano barrier agent, reactive compatibilizer.The composite nano barrier agent is composed of modified nano silicon dioxide and modified halloysite nanotube.The reactive compatibilizer is styrene-glycidyl methacrylate copolymer.The present application realizes the bottle grade polyester of high barrier, high transparency and low acetaldehyde under low PEN addition amount by the synergistic effect of the triple mechanism of intrinsic barrier of PEN, physical maze effect of composite nano barrier agent and interface strengthening of reactive compatibilizer, and the technology of master batch pre-dispersion process, vacuum exhaust and acetaldehyde absorption is combined, meets the requirement of food packaging, and is suitable for juice, tea beverage, edible oil and other packaging containers.

The present application relates to the technical field of polyester material modification, and particularly relates to a high-transparency polyethylene naphthalate material, a preparation method and application, aiming at the problems of fast crystallization rate of the PEN material in the process of processing and molding, easy crystallization of thick products, light transmittance reduction caused by the crystallization, and insufficient material toughness, the present application introduces a diol monomer containing a side group and a flexible chain segment diol monomer into the PEN melt polycondensation process for copolymerization, wherein the diol containing a side group introduces a steric hindrance structure in the molecular chain to destroy the regular packing of the PEN molecular chain, thereby inhibiting the material crystallization behavior and improving the light transmittance of the thick product; the flexible diol introduces a flexible chain segment in the molecular chain to increase the free volume of the molecular chain and improve the molecular chain movement ability, thereby improving the material toughness. Through the above-mentioned synergistic copolymerization modification method, the crystallization tendency of the PEN material can be effectively reduced, the obtained PEN thick product has excellent light transmittance and toughness at the same time, and is suitable for the preparation of high-performance transparent polyester products.

The application discloses a kind of optical adhesive protective group film, comprising: core layer, it is arranged between first surface layer and second surface layer;Core layer includes first polyester;First surface layer and second surface layer include the mass ratio of (45~50) and functional master batch of (50~55) first polyester, and functional master batch includes polyethylene naphthalate, second polyester and modified barium sulfate.By mixing the dispersibility of functional master batch and first polyester is improved, and then the haze and light transmittance of base film are optimized;By polyethylene naphthalate preparation functional master batch, the heat resistance and stability of base film are optimized, and its transmittance is improved and haze is reduced.

A foamed polymer composition includes a matrix polymer component, and from 0.01 wt % to 2 wt %, based on the weight of the polymer composition, of a nanostructured fluoropolymer, a nanostructured fluoropolymer encapsulated by an encapsulating polymer, or a combination thereof. The matrix polymer component includes polybutylene terephthalate (PBT), polyetherimide (PEI), polyethylene terephthalate (PET), polycarbonate (PC), poly(p-phenylene oxide) (PPO), polystyrene (PS), polyphenylene sulfide (PPS), polypropylene (PP), polyamide (PA), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), copolymers thereof, or a combination thereof. Methods for forming foamed polymer compositions, including core-back molding methods and extrusion foaming methods, are also described.

A multilayer optical film includes a plurality of alternating polymeric first and second layers numbering 10 to 120 in total. Each of the first and second layers having an average thickness of less than about 500 nm. The first layers include polyethylene naphthalate, and the second layers include a copolyester comprising at least one of cyclohexane dicarboxylic acid groups, adipic acid groups, or tetramethyl cyclobutanediol groups, such that for substantially normally incident light and for at least one polarization state, the multilayer optical film has an average optical reflectance of at least about 70% in a wavelength range at least about 200 nm wide.

The invention relates to a modified polycarbonate master batch, a composite polycarbonate material as well as a preparation method and application thereof. The modified polycarbonate master batch is prepared from the following raw materials in parts by weight: 70 to 95 parts of polycarbonate, 5 to 25 parts of polyethylene naphthalate, 0.1 to 2 parts of epoxy resin coupling agent and 0.5 to 3 parts of compatilizer A. The composite polycarbonate material is prepared from the following components in parts by weight: 50 to 90 parts of modified polycarbonate master batch, 5 to 35 parts of polyetherimide and 0.2 to 2 parts of compatilizer B. Polyethylene naphthalate is used for modifying polycarbonate, the high-temperature-resistant modified polycarbonate master batch is prepared, then the modified polycarbonate master batch and polyetherimide are blended, and the prepared composite polycarbonate material has excellent high-temperature resistance and mechanical performance.

The application discloses high-characteristic-viscosity polyethylene naphthalate with a branched structure and a preparation method thereof, and belongs to the technical field of material chemical industry. The preparation method comprises the following steps: 60-65 parts of dimethyl 2,6-naphthalene dicarboxylate, 35-40 parts of ethylene glycol, 0.1-2 parts of three / four branched monomers, 0.01-0.5 parts of a catalyst and 0.01-0.5 parts of an antioxidant are mixed according to the mass fraction, a polymerization reaction is carried out, methanol is removed, and then ethylene glycol is removed. In the application, the three / four branched monomers are added in a certain amount to form a branched chain structure on the polymer main chain, so that the melt viscosity of the polymer is reduced, which is beneficial to the mass transfer and diffusion of the small-molecule byproduct ethylene glycol, and then is beneficial to the forward progress of the polycondensation reaction, and the reaction time is shortened. The branched structure reduces the viscosity, more byproduct ethylene glycol can be removed, the reaction degree is increased, and the product obtained has a higher characteristic viscosity.

The invention relates to the technical field of photoelectric materials and devices, in particular to a flexible perovskite photovoltaic module barrier film and a preparation method thereof. The flexible perovskite photovoltaic module barrier film comprises a substrate layer, a first barrier layer, a self-repairing layer and a second barrier layer, the substrate layer is any one of a polyethylene glycol terephthalate film and a polyethylene naphthalate film, and the thickness of the substrate layer is 100-150 microns; the first barrier layer comprises any one of a SiO2 thin film and an Al2O3 thin film, and the thickness of the first barrier layer is 20-50 nm; the self-repairing layer is prepared from hydroxyethyl methylacrylate, dodecafluoroheptyl methacrylate, a cross-linking agent and a photoinitiator, the cross-linking agent comprises any one of a disulfide bond-containing cross-linking agent and a dihydrazide cross-linking agent, and the thickness of the cross-linking agent is 2-5 microns. And the second barrier layer comprises any one of an Al2O3 film, a fluorosilicone resin film, a thermoplastic polyolefin film and an organic-inorganic hybrid layer. And the stability and the damp-heat cycle resistance of the flexible perovskite photovoltaic module can be improved.

To provide a blow molding composed of a resin composition, having excellent transparency and heat resistance, with suppressed necking phenomenon in a drawing process.SOLUTION: A blow molding comprises a blow-molded resin composition. Relative to 100 pts.wt. of (A) polyethylenenaphthalate resin (A component), the resin composition comprises (B) polyether imide resin (B component) 60-150 pts.wt.SELECTED DRAWING: None

The application discloses a titanium-magnesium bimetallic catalyst for synthesizing polyethylene naphthalate resin and a preparation method and application thereof, and the preparation method comprises the following steps: carrying out static reaction on a titanium salt, a magnesium salt, a hydrolysis promoter and water at 100-300 DEG C for 12-48 h to obtain a bimetallic gel; adding ethylene glycol into the bimetallic gel and reacting at 80-180 DEG C for 3-6 h, filtering and drying to obtain a titanium-magnesium bimetallic catalyst for polymerization. The titanium-magnesium bimetallic catalyst in the application forms a multiradical ring intermediate through an ester bond and a hydroxyl group, changes an electron cloud arrangement mode, effectively inhibits the occurrence of an etherification side reaction, reduces the generation of a diethylene glycol segment, and avoids the yellowing problem of a PEN resin. The catalyst has the advantages of simple synthesis, remarkable catalytic effect, low colority of a PEN product and the like, and has a wide industrial application prospect.

An optical polyester film, the polyester film comprising a core layer and at least one surface layer, the core layer and surface layer being prepared by melt extrusion and biaxial stretching with a co-extrusion die, the core layer comprising 30wt%-90wt% of a conventional polyester and 10wt%-70wt% of semi-crystalline polyethylene naphthalate; the surface layer comprising 5wt%-55wt% of a modified polyester, 35wt%-94.9wt% of a conventional polyester and 0.1wt%-10wt% of a functional masterbatch; the functional masterbatch containing slip particles; the modified polyester being obtained by melt extrusion of 30wt%-90wt% of a conventional polyester and 10wt%-70wt% of a modified methacrylic resin, the modified polyester having an intrinsic viscosity of 0.70dL / g-0.85dL / g. The optical polyester film has the characteristics of low exudation, excellent barrier property and good optical performance.

The invention relates to the technical field of high polymer materials and polyester synthesis, in particular to polyethylene naphthalate resin and a preparation method and application thereof.According to the method, a small amount of flexible long-chain diol monomers are introduced into a PEN prepolymer molecular chain in the liquid phase polymerization stage, so that an obtained prepolymer has high chain segment flexibility; then carrying out isothermal crystallization to preferentially grow into a loose beta crystal structure; and finally, carrying out solid-phase polycondensation reaction to obtain the polyethylene naphthalate resin. Wherein a flexible chain segment is introduced, and the crystallization behavior of a PEN prepolymer is regulated, so that a beta crystal structure with a continuous amorphous channel is more easily formed, the rapid diffusion and removal of an ethylene glycol byproduct are promoted, the solid phase polycondensation rate is obviously accelerated, the molecular weight is improved, and the obtained PEN resin has excellent thermal stability, color and luster and mechanical properties; the method is suitable for preparing high-strength and high-modulus fibers and engineering plastics, and solves the problems of long process period and poor controllability in the PEN preparation process in the prior art.

A power transmission belt comprising a body (102) made of a sizing material having a main elastomer, a tooth portion (104), and a belt back (107) and a plurality of longitudinal cords (103) embedded in the belt body wherein: the main elastomer constitutes at least 70% by weight of all elastomer materials of the body; the main elastomer is an ethylene-alpha-olefin copolymer; the body comprises at least 12% by weight of fibers; the fiber is selected from the group consisting of glass, aramid fiber, polyester, carbon fiber, polybenzobisoxazole (PBO), polyamide, polyketone (POK), polyether-ether-ketone (PEEK), polyvinyl alcohol (PVA), liquid crystal fiber (LPC), polyethylene naphthalate (PEN) and aliphatic polyamide; the size of the fibers is between 1mm and 6mm; the teeth are coated with a coating material selected from the group consisting of woven fabrics, knitted fabrics and non-woven fabrics; the coating material is treated by adopting a polymer containing nitrile groups; the cladding material is coated with a second treatment layer (109) comprising an elastomer and an antifriction material.

The invention provides a high molecular weight polyethylene naphthalate resin and a solid phase polycondensation preparation method thereof, the method takes dimethyl 2, 6-naphthalate, ethylene glycol and a diol monomer with a large steric hindrance side group as raw materials, and the high molecular weight polyethylene naphthalate resin is obtained through the steps of pre-polymerization (liquid phase polymerization), isothermal crystallization treatment and solid phase polycondensation treatment; according to the invention, a large steric hindrance side group is introduced in a pre-polymerization stage, and subsequent crystallization regulation and control and solid phase polycondensation processes are combined, so that the polycondensation reaction can be effectively promoted, the molecular weight of the PEN resin is obviously improved, and a high molecular weight product with the number-average molecular weight of 46265-58421 g / mol is finally obtained; the method is simple in process step, and the prepolymer obtained by prepolymerization can be directly extruded and diced to form particles with uniform particle size, so that the subsequent process operation is facilitated; reaction conditions involved in each step are easy to control, the method can adapt to conventional industrial production equipment, and the product is stable in performance and good in repeatability and has a wide industrial application prospect.

This invention provides a high-temperature and UV-resistant road surface maintenance seal and its preparation method, comprising, from bottom to top, an original road surface layer, a first elastomeric polymer material layer, an emulsified asphalt material layer, a sand layer, and a second elastomeric polymer material layer. Both the first and second elastomeric polymer material layers are made of elastomeric polymer materials. The elastomeric polymer includes a base material, a modifying material, and additives. The base material includes polyethylene naphthalate. The modifying materials include rubidium borate and benzothiorrole. The rubidium borate / benzothiorrole composite material used in the modified material of this invention, in addition to leveraging the UV-resistant and high-temperature resistant properties of rubidium borate and benzothiorrole, also acts as a sound-absorbing and noise-reducing agent for polyethylene naphthalate in the base material, producing a synergistic enhancement effect.

Described herein are negative electrodes comprising polymer base layers and current collector layers, formed from alloys or multi-layered structures, lithium electrochemical cells (e.g., lithium metal and lithium-ion cells), comprising such electrodes, and methods of fabricating such electrodes. In some examples, a negative electrode comprises a polymer base layer, a current collector layer, and a negative active material layer. The polymer base layer can be formed from one or more of polyethylene terephthalate, polyethylene naphthalate, polypropylene, polycarbonate, polyethylene, polyimide, cellulose, and nylon. The negative current collector layer can be formed from an alloy or a multi-layered structure comprising at least two or more elements selected from the group aluminum, cadmium, chromium, cobalt, copper, indium, lithium, manganese, magnesium, molybdenum, nickel, phosphorous, silicon, silver, sodium, tin, titanium, vanadium, and zinc. For example, the negative current collector layer can be formed from an alloy of titanium and aluminum or a lithium alloy.

The invention discloses a polarization diaphragm and a preparation method thereof, a polarization structure unit, a backlight module and a display panel, and relates to the technical field of polarization diaphragm materials, the polarization diaphragm comprises chain-shaped polyethylene naphthalate and perovskite quantum dots: the perovskite quantum dots are linearly arranged along the stretching direction of the chain-shaped polyethylene naphthalate; the refractive index of the chain-shaped polyethylene naphthalate in the stretching direction is larger than that in the first direction, and the first direction is located in the plane where the chain-shaped polyethylene naphthalate is located and intersects with the stretching direction of the chain-shaped polyethylene naphthalate. The perovskite quantum dots extend along the stretching direction of the chain-shaped polyethylene naphthalate, the chain-shaped polyethylene naphthalate has a polarization characteristic, the perovskite quantum dots are linearly distributed and show the characteristic of light-excited polarized light, and the polarization degree of the polarization film is synergistically improved through the polarization effects of the chain-shaped polyethylene naphthalate and the perovskite quantum dots; therefore, the problem that the optical utilization rate of the backlight source is low is solved.

The invention discloses a PDA-CNTs / Au-Ag / Ppy / PEN composite film electrode and a preparation method thereof, and belongs to the technical field of supercapacitors. The composite film electrode comprises a polyethylene naphthalate substrate and a PPy layer located on the surface of the substrate, and the PPy layer is formed by in-situ polymerization of a pyrrole monomer in the presence of a composite oxidant; the Au-Ag alloy layer is positioned on the surface of the PPy layer; and the polydopamine coated carboxylated multi-walled carbon nanotube layer is positioned on the surface of the Au-Ag alloy layer. The electrode system solves the problem of insufficient interface separation and stability of a traditional composite electrode, and is particularly suitable for the development demand of a high-performance flexible energy storage device. In addition, the preparation method of the electrode realizes high performance (such as high specific capacitance and excellent cycle retention rate) of the electrode, and also embodies the environmental protection property (such as non-toxic residue and simple and convenient subsequent treatment of the composite oxidant) and the industrialization feasibility in the aspect of process while the preparation method of the electrode realizes the high performance (such as high specific capacitance and excellent cycle retention rate) of the electrode.

A method for dehydrating a polyester-containing material according to the present invention includes a dehydration step of causing a polyester-containing material and a carbonic acid diester to contact one another, and heating the same. The carbonic acid diester is preferably a dialkyl carbonate, and the alkyl group in the dialkyl carbonate preferably has 1 to 12 carbon atoms. In addition, the heating temperature in the dehydration step is preferably 50°C or higher and lower than the boiling point of the carbonic acid diester. Furthermore, the polyester contained in the polyester-containing material is preferably one or more selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate.

The invention provides a high-viscosity low-adhesive-residue electronic component fixing adhesive tape, the adhesive tape comprises an adhesive layer, a buffer layer and a base material layer, the buffer layer adopts a gradient component gradual change structure, the base material layer adopts a blend of polyethylene glycol terephthalate and polyethylene naphthalate in a mass ratio of 7: 3, and the adhesive layer adopts a high-viscosity low-adhesive-residue electronic component fixing adhesive tape. And a bionic micro-nano structure is arranged on one side, connected with the buffer layer, of the surface of the substrate. Through three-layer structural design, the pressure-sensitive adhesive layer provides high-viscosity and low-residue core performance, the gradient transition layer eliminates interface stress, the bionic base material layer improves structural stability and interface bonding force, and the electronic element fixing adhesive tape which is high in viscosity, low in residue, wide in temperature range stability, simple in preparation process and controllable in cost is developed.

The present application provides a pressure measurement sheet set and a manufacturing method thereof, which is difficult to deform and damage the coating film even when used at high temperatures. The pressure measurement sheet set of the present application comprises a first sheet having a first support, an adhesive layer, and a first layer comprising microcapsules containing a color developer and an adhesive; and a second sheet having a second support and a second layer containing a color developer. The first and second supports are polyethylene naphthalate sheets or aromatic polyimide sheets. The adhesive layer contains a resin X1 having at least one group selected from an aromatic group, an ester bond, and an imide bond. The capsule wall of the microcapsules contains a resin Y1 having an aromatic group. The adhesive in the first layer has an absorption peak in the infrared absorption spectrum at 3200-3500 cm ‑1 has a top peak or crosslinking. The thickness of the first layer is 0.2 μm or more.

The invention relates to the technical field of preparation of polyester composite materials, in particular to an anti-aging and anti-fatigue polyester elastomer composite material and a preparation method thereof. According to the invention, a high-hard-segment TPEE matrix and a hard segment containing 5% of polyethylene naphthalate copolymer are adopted, maleic anhydride grafted polypropylene is combined as an interfacial compatibilizer, and functional components such as a silane modified illite-based flame-retardant complex and nano molybdenum disulfide, fluorinated carbon fiber and the like are matched; the thermal stability, the ultraviolet aging resistance and the mechanical fatigue performance of the material are obviously improved. By optimizing a twin-screw extrusion process, uniform dispersion of components and efficient chain extension reaction are realized, the preparation process is environment-friendly, and the process is stable. The material has excellent flame-retardant effect and long-term weather resistance, is suitable for the application field of high-performance elastomers, and has good industrial popularization value.

This invention discloses a blue light blocking and UV-resistant polyester film, its preparation method, and its applications, primarily relating to the field of layered products composed of polyester. Compared with existing technologies, the blue light blocking and UV-resistant polyester film of this invention is obtained from three layers of masterbatch materials (A, B, and C) through steps such as melting, casting, and stretching. The masterbatch material A consists of polyethylene terephthalate, a synergistic resin, and an opening agent; the masterbatch material B consists of polyethylene terephthalate, a UV absorber, and a blue light absorber; and the masterbatch material C consists of polyethylene terephthalate, a synergistic resin, and polyethylene naphthalate. Compared with existing technologies, this invention improves the density and uniformity of the film's internal structure, enhances the dispersibility and stability of functional additives, reduces defects, and ultimately achieves a synergistic improvement in blue light blocking and UV resistance performance while ensuring the film's mechanical properties.

The application discloses a perovskite ink suitable for meniscus coating, a preparation method and application thereof, the perovskite ink comprises a perovskite material, a polymer additive and a solvent; the polymer additive is selected from one or more of polymethyl methacrylate, polydimethylsiloxane, polyethylene naphthalate, polyethylene terephthalate, polyimide, polycarbonate, polyurethane, natural rubber or silicone polymer. The application adopts a polymer additive to regulate the shape of perovskite precursor micelles in a solution, and prepares perovskite precursor ink. The ink shows uniform film morphology and single crystal orientation after blade coating. The high-quality perovskite film prepared by using the perovskite ink improves the performance of a perovskite battery.

The invention discloses a one-way yarn printing screen. The one-way yarn printing screen comprises a screen frame, screen cloth, a protective layer and an epoxy structural adhesive sputtering layer. The screen cloth is fixedly connected to the end face of the upper side of the screen frame. The screen cloth comprises a plurality of warps which are parallel to one another. A protective layer is attached between the screen frame and the screen cloth. The outer side end faces of the multiple warps are coated with the epoxy structural adhesive sputtering layer, the total thickness of the screen cloth, the protective layer and the warps is 6-50 microns, the breadth of the multiple warps is 100-1250 mm, the distance between every two adjacent warps is 3-2000 microns, and the outer side end faces of the multiple warps are coated with the epoxy structural adhesive sputtering layer. And the protective layer is made of one of polyimide, polyethylene glycol terephthalate, polyethylene naphthalate and a fluoropolymer film. Precise arrangement of the warps is achieved, meanwhile, the wefts are removed, on one hand, the preparation efficiency is greatly improved, and on the other hand, due to the fact that no weft blocking exists, through printing resistance is greatly reduced, and the grid breaking rate is remarkably reduced.

The present application provides a polyethylene naphthalate resin composition which can be used for optical members such as optical films. The polyethylene naphthalate resin composition for optical members of the present application contains (A) polyethylene naphthalate and (B) a phosphorus compound or a salt thereof represented by the following formula (I) or (II) (in the formula, R1 represents an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a benzyl group, R2 and R3 represent an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, a benzyl group, a glycol group, or a hydrogen atom, and R1 and R2 can be bonded to form a ring).

The invention belongs to the technical field of optical thin film manufacturing, and discloses a production process of a multi-layer co-extrusion reflective polarizing film. The process comprises the following steps: respectively preparing a supporting layer raw material containing polyethylene terephthalate, an antioxidant and a sticky plastic, and a polarized functional layer raw material containing polyethylene naphthalate, polymethyl methacrylate, a nano metal oxide and a sticky plastic; co-extruding to form a 330-layer alternately laminated film blank with the supporting layer positioned on the surface layer; and carrying out transverse stretching at 80-100 DEG C, three-stage gradient heat setting and plasma treatment. According to the preparation method, the problems of poor interlayer bonding force and high-temperature deformation are solved through adhesive interface compatibilization, nanoparticle scattering and gradient heat setting stress release; the polarization degree of the obtained polarizing film is larger than 75%, the tensile strength is larger than 80 MPa, the 150 DEG C thermal shrinkage rate is smaller than 1%, the thickness deviation is + / -3 microns, the 150 DEG C thermal shrinkage rate is smaller than 1%, and the polarizing film has excellent optical performance and dimensional stability.

This invention provides cones that are easy to pull out even when stacked and left undisturbed in direct sunlight, and that are also easy to mold and process. [Solution] A cone having a conical portion, wherein the conical portion contains polyethylene terephthalate and polyethylene naphthalate, and the mass ratio of polyethylene terephthalate to polyethylene naphthalate is 85:15 to 15:85.