190 results about "Cyclohexanedimethanol" patented technology

The present invention provides a polyester heat-shrinkable film containing recycled materials and a preparation method thereof, belonging to the technical field of polymer synthetic films. The raw materials of the polyester heat-shrinkable film include recycled PET polyester particles, PET polyester chips, and a modified masterbatch; the modified masterbatch is prepared from polyethylene terephthalate-1,4-cyclohexanedimethanol ester, triphenyl phosphite, polyethylene glycol block copolymer, nano-silica, and hyperbranched polyester amine; the polyethylene glycol block copolymer is prepared from polyethylene glycol and γ-valerolactone under the action of a catalyst; the hyperbranched polyester amine is prepared from trimethylolpropane, methyl crotonate, and diethylenetriamine. The product of the present invention has excellent properties such as excellent unidirectional anti-shrinkage performance and low haze.

The invention relates to the technical field of multi-layer copolyester films, and discloses a high-temperature-resistant antistatic multi-layer copolyester film and a preparation method and application thereof, and the multi-layer copolyester film comprises an ABA three-layer structure obtained through melt co-extrusion; the layer A is prepared from the following raw materials in percentage by mass: 5 to 30 percent of anti-blocking agent master batch and the balance of modified copolyester; the raw material of the layer B is modified copolyester; the modified copolyester is prepared from a binary acid mixture, a dihydric alcohol mixture and a catalyst through an esterification reaction and a condensation polymerization reaction; the binary acid mixture comprises furandicarboxylic acid and 2, 2 '-bifuran-5, 5'-dicarboxylic acid, and the dihydric alcohol mixture comprises ethylene glycol, 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol and 1, 4-cyclohexanedimethanol. According to the invention, the modified copolyester is used as a main raw material, and the film is endowed with good temperature resistance in a copolymerization modification manner, and has stable and lasting antistatic performance.

The invention discloses a dental plaque display type anti-caries invisible appliance based on synergism of iron-based nano-enzyme catalysis and traditional Chinese medicine caries inhibition, and belongs to the field of oral medical instruments. The preparation method of the appliance diaphragm comprises the following steps: preparing a composite material with the functions of catalytically degrading a bacterial biofilm matrix barrier and killing internal bacteria from polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol (PETG) and a Fe3O4 nano-enzyme filler in a solution blending manner; and after the composite material is subjected to thermoplastic molding, a layer of molecularly imprinted polymer (MIP)-spiropyrane and chitosan-magnolol are coated with the fluorescent display agent which is prepared by mixing the molecularly imprinted polymer (MIP)-spiropyrane and the chitosan-magnolol. The iron-based nano-enzyme can catalytically degrade a bacterial biofilm matrix barrier and kill internal bacteria, and the MIP-spiropyrane fluorescent display agent can specifically display the accumulation condition of cariogenic bacterial plaque in the oral cavity under ultraviolet irradiation. The invisible orthodontic appliance can reduce or prevent caries while having the same orthodontic effect as other orthodontic appliances in the market.

The invention relates to a catalyst for preparing 1, 4-cyclohexanedimethanol (CHDM) by catalyzing dimethyl terephthalate (DMT) hydrogenation and a preparation method thereof, non-noble metals nickel (Ni) and copper (Cu) are used as active components, silicon dioxide is used as a carrier, ammonia water in a solution is evaporated out after ammonia water precipitation, and a catalyst sample is obtained. The active components mainly adopt metal Ni and Cu elements with relatively low price, compared with noble metals such as ruthenium, rhodium, platinum and the like, the use cost of the catalyst is greatly reduced, the bimetallic catalyst Ni-Cu-SiO2 is prepared by an ammonia distillation method, 1, 4-cyclohexanedimethanol can be prepared by catalyzing dimethyl terephthalate hydrogenation by a one-pot method, and the catalyst has a wide application prospect. The preparation cost of the catalyst is relatively low, the dispersity and stability of the catalyst are improved by adopting an ammonia distillation method, the CHDM is prepared by adopting a one-pot method, the energy consumption is further reduced, the reaction procedure is simplified, and the preparation method is simple and is easy to amplify to industrial production.

The invention discloses a crystallinity low-melting-point polyester fiber and a preparation method thereof, and relates to the technical field of polyester fibers, the crystallinity low-melting-point polyester fiber is composed of a skin layer and a core layer, and a skin-core integrated crystallization design is adopted; the skin layer is modified copolyester, and the core layer is modified PET; the modified copolyester is prepared from the following raw materials in parts by weight: 38 to 42 parts of terephthalic acid, 12 to 15 parts of 2, 5-furandicarboxylic acid, 28 to 32 parts of 1, 4-cyclohexanedimethanol, 8 to 10 parts of polycaprolactone, 1.0 to 1.5 parts of a crystallization coordinating agent, 0.5 to 1.0 part of an antioxidant and 0.3 to 0.5 part of a hindered amine light stabilizer. The crystallization coordinating agent is prepared by compounding hydroxylated graphene and maleic anhydride grafted polyolefin elastomer according to a mass ratio of (2 to 3): 1. The fiber is good in high temperature resistance and durability, low in melting point, good in size stability and long in service life.

The invention discloses a low-temperature high-shrinkage PETG shrink film, which adopts a three-layer co-extrusion structure, and comprises a surface layer, a core layer and a bottom layer, the core layer is prepared from a PETG shrink film functional master batch accounting for 90-95 wt% of the total mass and PETG for a common film, and the PETG shrink film functional master batch is prepared from the following raw materials in parts by weight: 100-120 parts of terephthalic acid, 100-120 parts of 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 100-120 parts of 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 100-120 parts of 1, 2, 4-trimethyl-1, 3-pentanediol The invention relates to a high-temperature-resistant polyurethane adhesive which is prepared from the following components in parts by weight: 30 to 50 parts of 1, 4-cyclohexanedimethanol, 80 to 100 parts of ethylene glycol, 0.1 to 0.2 part of triaryl phosphate, 0.01 to 0.03 part of isocyanate, 0.01 to 0.02 part of potassium tripolyphosphate, 0.1 to 0.2 part of magnesium aluminum silicate, 0.2 to 0.4 part of disodium ethylene diamine tetraacetate and 0.3 to 0.5 part of other auxiliaries. The invention also discloses a preparation method of the shrink film. The transverse thermal shrinkage rate of the PETG shrink film with a three-layer structure prepared by taking the functional master batch as a core layer is greater than 70% at 80 DEG C, and when the PETG shrink film is used as a label of an outer package of a product, the PETG shrink film has relatively good shrink packaging performance on special-shaped bottles, common PP bottles and the like, and the packaging bottles are not easy to damage and deform.

The invention relates to the technical field of catalysis, and discloses a combined catalyst and application thereof in preparation of 1, 4-cyclohexanedimethanol. The catalyst A and the cocatalyst in the combined catalyst have high reaction selectivity in the process of catalytically oxidizing paraxylene (PX) to prepare terephthalyl alcohol, so that the conversion rate of the PX and the yield of the terephthalyl alcohol are relatively high, and an oxidation product can be directly hydrogenated to prepare 1, 4-cyclohexanedimethanol without separation and purification; meanwhile, the hydrogenation catalytic performance of the catalyst B is excellent; under the combination, paraxylene can be directly converted into 1, 4-cyclohexanedimethanol through a one-step oxidation reaction and a one-step hydrogenation reaction, the technological process can be greatly shortened, and the catalyst is easy to separate and recover after reaction.

The invention relates to the technical field of thermoplastic plastics, in particular to modified PCTG polyester and a preparation method and application thereof, and the modified PCTG polyester is formed by copolymerization of terephthalic acid, isophthalic acid, 1, 4-cyclohexanedimethanol, diethylene glycol, neopentyl glycol and 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol. The problems that existing PCTG is insufficient in temperature resistance, transparency, mechanical property and chemical corrosion resistance can be solved.

The invention discloses transparent resin as well as a preparation method and application thereof, and belongs to the technical field of polyester synthesis and application and development of polyester materials. The preparation method comprises the following steps: sequentially carrying out esterification reaction and polycondensation reaction on a mixture containing dibasic acid, dihydric alcohol, a catalyst and a stabilizer to obtain transparent resin; the binary acid is selected from at least one of terephthalic acid, 2, 5-furandicarboxylic acid and 2, 5-thiophenedicarboxylic acid; the dihydric alcohol is selected from at least two of ethylene glycol, 1, 4-butanediol, 1, 4-cyclohexanedimethanol, isosorbide and 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol, and the dihydric alcohol is selected from at least two of ethylene glycol, 1, 4-butanediol, 1, 4-cyclohexanedimethanol, isosorbide and 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol; the catalyst is selected from defect-state nano titanium dioxide; and the stabilizer is selected from triphenyl phosphate. By using the combination of the defect-state nano titanium dioxide catalyst and the triphenyl phosphate stabilizer, the polymerization reaction can be completed with high activity and low time consumption, and meanwhile, good transparency, excellent color, low ash content and excellent thermodynamic property of the product are kept.

The invention relates to the technical field of powder coatings, and provides a high-temperature-resistant powder coating and a preparation method thereof. The high-temperature-resistant powder coating is prepared from the following raw material components in parts by mass: 18 to 22 parts of vinyl silicone resin, 12 to 22 parts of novolac epoxy resin, 1 to 6 parts of 1, 4-cyclohexanedimethanol glycidyl ether, 12 to 14 parts of acrylic resin, 50 to 60 parts of filler and 2 to 3 parts of curing agent, the mass content of vinyl in the vinyl silicon resin is 1.29%-1.33%. According to the technical scheme, the problem of poor high-temperature resistance of the powder coating in the related technology is solved.

The invention discloses a deep embossing polyester facing film, a preparation method thereof and a polyester film facing plate. The polyester facing film is prepared from the following raw materials in percentage by weight: 10 to 20 percent of flame-retardant polyester and the balance of poly (1, 4-cyclohexanedimethanol terephthalate); the flame-retardant polyester is prepared by condensation polymerization of a first esterification product and a second esterification product in a mass ratio of (60-70): (20-30), the raw materials of the first esterification product comprise terephthalic acid and 1, 4-cyclohexanedimethanol in a molar ratio of 1: (1.05-1.3), and the raw materials of the second esterification product comprise a benzoxazine phosphate monomer and dihydric alcohol in a molar ratio of 1: (1.1-1.3). The benzoxazine phosphate chain segment is introduced into the PCT, so that the flame retardant property of the polyester facing film is remarkably improved on the basis of not keeping the mechanical property and the processability of the polyester material.

The present disclosure relates to a polyester film and a preparation method of the same. Since the polyester film includes a resin layer formed from a mixture comprising a polyester resin, which includes a first diol moiety derived from isosorbide and a second diol moiety derived from cyclohexanedimethanol in a controlled ratio, and polyethylene terephthalate in a specific ratio, it is possible to exhibit improved heat resistance and adhesion with excellent light transmittance.

The present invention relates to the field of coating preparation. Disclosed are a low-temperature curing thin-coat powder coating and a preparation method therefor. The powder coating comprises a resin, an accelerant, a curing agent, a dispersing agent, benzoin, barium sulfate, a leveling agent, a brightening agent, and a pigment as preparation raw materials, and the preparation raw materials of the resin comprise neopentyl glycol, ethylene glycol, 1,4-cyclohexanedimethanol, terephthalic acid, adipic acid, isophthalic acid, a catalyst, and an antioxidant. In the present application, by optimizing the preparation raw materials of the resin and the preparation raw material proportion, the branching degree and the terminal carboxyl activity of the resin are effectively improved, the reaction activity of the resin is ensured, the curing temperature of the powder coating is reduced, and excellent weather resistance and mechanical properties can also be obtained; moreover, the catalyst and the antioxidant are added in the resin preparation stage, thereby facilitating improvement of the storage stability, solving, taken as a whole, the problem of non-uniform dispersion of powder coatings, and facilitating improvement of the glossiness of the coating and the performance of the coating.

The present invention provides a polyester wherein: a dicarboxylic acid constituent unit includes 72.5 mol% or more of a constituent unit derived from 2,6-naphthalenedicarboxylic acid and / or an ester derivative thereof among a total 100 mol% of said dicarboxylic acid constituent units; and a diol constituent unit includes 27.5 mol% or more of a constituent unit derived from 1,4-cyclohexanedimethanol and a constituent unit derived from 2,2,4,4-tetramethyl-1,3-cyclobutanediol among a total 100 mol% of said diol constituent units. A feeding bottle according to the present invention is formed using said polyester.

The invention discloses a high-temperature-resistant liquid crystal polymer substrate for ultrathin flexible display, which belongs to the technical field of flexible display and comprises a modified liquid crystal polymer and a functional additive dispersed in the modified liquid crystal polymer. The modified liquid crystal polymer is prepared by polymerizing a monomer composition, and is specifically prepared from 38 to 42 parts of p-hydroxybenzoic acid, 28 to 30 parts of 4, 4 '-biphenol, 5.6 to 6.0 parts of terephthalic acid, 4.4 to 5.0 parts of 2, 6-naphthalic acid, 2.7 to 3.3 parts of isophthalic acid, 9 to 11 parts of 2, 2-bis (3, 5-difluoro-4-hydroxyphenyl) hexafluoropropane, 4.5 to 5.5 parts of N, N'-dihydroxypyromellitic diamine, 9 to 11 parts of 9, 9-bis [4-(4-methoxycarbonyl phenoxy) phenyl] fluorene and 1, 2-bis (4-(4-methoxycarbonyl phenoxy) phenyl] fluorene. The component A is prepared from 5.5 to 6.5 parts of 1, 4-cyclohexanedimethanol; the functional additive comprises an azobenzene derivative, a hot acid generator and a hydrogen bond enhancer; through the synergistic effect of a specific monomer combination, a functional additive and an optimization process, the technical bottleneck that heat resistance, transparency, dimensional stability and flexibility of an existing material are difficult to consider at the same time is broken through.

The invention provides a 3D printing supporting material as well as a preparation method and application thereof. The 3D printing supporting material is prepared from an ethylene-vinyl alcohol copolymer, polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester, polyolefin elastomer grafted maleic anhydride, glass fibers and a filling material in specific parts. Through reasonable matching of the components in a specific dosage, the 3D printing supporting material can adapt to different types of printing base materials, has an excellent supporting effect and relatively low water absorption rate, can be easily stripped from a part body, and is very suitable for being used as a supporting material of an FDM printer.

The invention discloses a composite material and a preparation method thereof, and relates to the technical field of building materials. The preparation method comprises the following steps: providing a first mixed solution and 1, 3-cyclohexanedimethanol, mixing, and carrying out a first reaction to obtain a first prepolymer solution; providing a second mixed solution and polytetramethylene ether glycol, mixing, and carrying out a second reaction to obtain a second prepolymer solution; the first mixed solution and the second mixed solution both comprise diphenylmethane diisocyanate; providing a third mixed solution, mixing the third mixed solution with the first prepolymer solution and the second prepolymer solution, and carrying out a third reaction to obtain a supramolecular polymer; the third mixed solution comprises a chain extender; providing a wear-resistant agent, an antioxidant and glass fibers, and mixing with the supramolecular polymer to obtain the composite material. The composite material obtained by the method provided by the invention has high strength, excellent impact toughness, high wear resistance and self-repairing capability, and has wide prospects in high-end application scenarios such as polyurethane doors and windows, curtain wall keels, photovoltaic brackets and the like.

The present invention relates to a biodegradable superabsorbent polymer and its preparation method, belonging to the technical field of polymer materials. First, polyol I and terpene acid undergo a ring-opening polymerization reaction to generate an oligomer with carboxyl side chains. Then, the oligomer with carboxyl side chains and polyol II undergo a polycondensation cross-linking reaction to obtain a degradable cross-linked polymer. Finally, the degradable cross-linked polymer reacts with sodium salt to prepare the biodegradable superabsorbent polymer. Polyol I is ethylene glycol, propylene glycol, butylene glycol, hexanediol, octanediol, isosorbide, isomannide, isoidide, IIDML, IMDML, ISDML, 1,4-cyclohexanedimethanol or furan dimethanol. Polyol II is glycerol, triethanolamine, 1,2,4-butanetriol, pentaerythritol or erythritol. The chemical structural formula of the product is or, and the number-average molecular weight is 10000-80000 g / mol. The method of the present invention has a simple process; the product has both superabsorbent ability and excellent biodegradability.

The invention provides a high-valued utilization method and device for residual liquid in a rectifying tower in the production process of 1, 4-cyclohexanedimethanol, and relates to the technical field of by-product purification, and the method comprises the following steps: adding residual liquid in a CHDM rectifying tower, a catalyst and methanol into a methanol alcoholysis tank for alcoholysis reaction; introducing the alcoholysis solution into a scraper evaporator for distillation separation, and conveying a product into a gas-liquid separation tank to obtain an alcoholysis concentrated solution; and introducing the alcoholysis concentrated solution into an alcoholysis solution recovery tower for vacuum rectification, and condensing to obtain a crude product CHDM. According to the method, a methanol alcoholysis process is innovatively adopted, the CHDM rectifying tower kettle residual liquid is efficiently converted into high-value products such as CHDM, MHMCC and DMCD, and the products can be directly recycled to an existing CHDM rectifying system; through a designed methanol and tower kettle residual liquid recycling system, efficient utilization of raw materials and emission reduction of wastes are realized; a high-efficiency catalyst is adopted, so that conversion can be realized under mild conditions; and the catalyst can be used together with a device, and can be directly connected to the existing CHDM rectification device without modifying the original device.

The present invention relates to the field of organic synthesis, and in particular to a system and method for polyester recycling co-producing bis(2-hydroxyethyl) terephthalate and 1,4-cyclohexanedimethanol. The system, in the direction of feed, sequentially comprises a polyester alcoholysis system, a solid filtration system, a solvent recovery system, and a diethyl terephthalate purification system, as well as a bis(2-hydroxyethyl) terephthalate preparation system and a 1,4-cyclohexanedimethanol preparation system, each connected to the diethyl terephthalate purification system. The present invention, by optimizing the process route for polyester recycling co-producing bis(2-hydroxyethyl) terephthalate and 1,4-cyclohexanedimethanol, first degrades a polyester into an intermediate product diethyl terephthalate, and then prepares bis(2-hydroxyethyl) terephthalate and 1,4-cyclohexanedimethanol from the diethyl terephthalate. In this way, two degradation products can be obtained simultaneously, especially addressing the current issue of the high production cost of 1,4-cyclohexanedimethanol, reducing the cost of polyester recycling, and making it more suitable for industrial application.

The invention provides polyester resin for a transparent powder coating with excellent adhesive force and leveling as well as a preparation method and application of the polyester resin, and belongs to the technical field of powder coatings. The polyester resin is mainly prepared by taking diethylenetriamine pentaacetic acid, triethyl chlorosilane, 1, 6-hexanediol, N, N-diisopropylethanolamine, 2, 2-dimethyl propanol, neopentyl glycol, 3, 3-tetramethylene glutaric anhydride, 1, 4-cyclohexanedimethanol and the like as raw materials through polymerization. The obtained polyester resin chain segment has many branched structures, the number of amino groups and ester groups in the branched structures is large, the softening point is low, the low-temperature melting fluidity is good, the transparency is high, the adhesive force with a base material is good, then high-functionality diethylenetriamine pentaacetic acid is adopted for carboxyl end capping, the terminal carboxyl functionality is high, the curing activity is high, and the curing effect is good. After being cured with E-12 epoxy resin at low temperature, a coating film is good in leveling property and high in transparency, and can be used in the fields of thermosensitive base materials which are not easy to adhere, such as thin glass materials and the like.

A process for producing 1,4-cyclohexanedimethanol by depolymerizing one or more recycled terephthalate-based polyesters or copolyesters via solvolysis with one or more glycols or alcohols and contacting the depolymerization product with an ester hydrogenolysis catalyst and hydrogen to produce a hydrogenolysis product and contacting the hydrogenolysis product with a hydrogenation catalyst and hydrogen to produce 1,4- cyclohexanedimethanol.

The invention discloses polyester resin for a weather-resistant powder coating and a preparation method of the polyester resin, and belongs to the technical field of resin preparation. The polyester resin is prepared from polyhydric alcohol, polyatomic acid, a catalyst, an auxiliary agent and modified montmorillonite, wherein the modified montmorillonite is a nano material which is subjected to surface coupling modification by a hydroxyl-terminated cationic waterborne polyurethane intercalation and gamma-aminopropyltriethoxysilane. By optimizing monomers, such as isophthalic acid and 1, 4-cyclohexanedimethanol, and combining a labyrinth barrier structure formed by modified montmorillonite in the resin, the weather resistance and hydrolysis resistance of the material are effectively improved. After the resin is applied to the powder coating, corrosion of water and acidic substances to ester bonds can be remarkably reduced in severe environments such as acid rain, and the service life of the coating is prolonged.

The invention provides a synthetic method of PETG (polyethylene terephthalate glycol), which comprises the following steps: ester exchange: carrying out ester exchange on bis (2-hydroxyethyl) terephthalate and 1, 4-cyclohexanedimethanol under the catalysis of an ester exchange catalyst to obtain an ester exchange product; pre-polycondensation: constructing a reaction system by using the bis (2-hydroxyethyl) terephthalate, the ester exchange product obtained in the ester exchange step, a polymerization catalyst and a stabilizer, heating the reaction system to 270-273 DEG C, reducing the pressure to be less than or equal to 10kPa, and carrying out pre-polycondensation; medium polycondensation: after the pre-polycondensation is completed, heating the reaction system to 273-275 DEG C, continuously reducing the pressure to be less than or equal to 1kPa, and continuously performing polycondensation; and final polycondensation: after the intermediate polycondensation is completed, heating the reaction system to 280-283DEG C, reducing the pressure to be less than or equal to 100Pa, and carrying out final polycondensation to obtain the PETG. BHET and ester exchange products are subjected to condensation polymerization in a multi-stage vacuum and stepped heating mode, small molecule by-products are effectively removed in the condensation polymerization process, and the polymerization degree is promoted to be improved.

The present application relates to an ABS composition and its preparation method and application, belong to the composition technical field of high molecular compound, the ABS composition of the present application includes the following weight parts of components: ABS resin 53~73 parts, PETG copolyester 15~30 parts, bromine flame retardant 11~13 parts, antimony flame retardant 1~3 parts, the weight percentage of butadiene in the ABS resin is greater than or equal to 20%, the weight percentage of 1,4-cyclohexane dimethanol in the PETG copolyester is 10%~30%, and the melt mass flow rate of the PETG copolyester under the condition of 220 DEG C, 10 kg is greater than or equal to 18 g / 10 min according to ISO 1133-1:2011 standard, the ABS composition not only has good flame retardant performance, but also has excellent marking effect and mechanical properties.

The present invention provides a polyester wherein: a dicarboxylic acid constituent unit is a constituent unit derived from 2,6-naphthalenedicarboxylic acid and / or an ester derivative thereof; and a diol constituent unit includes a constituent unit derived from any isosorbide, and 27.5 mol% or more of a constituent unit derived from 1,4-cyclohexanedimethanol among a total 100 mol% of said diol constituent units. A feeding bottle according to the present invention is formed using said polyester.

The invention relates to a toughened PPS membrane material and a preparation method thereof, and belongs to the technical field of PPS membranes. The PPS membrane material is prepared from the following components in percentage by weight: 5.5 to 9.2 percent of toughening agent, 0.18 to 0.23 percent of antioxidant, 1.5 to 1.8 percent of lubricant, 0.12 to 0.15 percent of light stabilizer and the balance of PPS resin, according to the toughening agent, trimethylolpropane triglycidyl ether and excessive 1, 4-cyclohexanedimethanol are subjected to ring opening to prepare an intermediate, and then succinic acid monoethyl ester acyl chloride and terminal hydroxyl of the intermediate are esterified to form a short branched ester chain for peripheral modification, so that the toughening agent is prepared; the toughening agent has a hyperbranched topological structure and has good infiltration and dispersion performance with a PPS matrix, internal organic clusters containing cyclic alkyl provide a large free volume, direct toughening is performed through a slippage mechanism, PPS is induced to form a uniform microcrystalline structure, formation of continuous-phase large-size spherocrystals is inhibited, and the toughness of PPS is remarkably improved.

The purpose of the present invention is to provide a polyester-based heat-shrinkable film which is suitable for heat-shrinkable label applications and which is less apt to become loose after having been applied as labels and does not become distorted when applied as labels. This polyester-based heat-shrinkable film has ethylene terephthalate units, and the polyester resin components include the following amorphous components: 8-20 mol% of 1,4-cyclohexanedimethanol-derived constituent unit included in 100 mol% of the diol components; and an adipic-acid-derived constituent unit and an isophthalic-acid-derived constituent unit included in 100 mol% of the dicarboxylic acid components in such amounts that the molar ratio of the content of each of the constituent units to the content in mol% of the 1,4-cyclohexanedimethanol-derived constituent unit is 0.1-0.5. The polyester-based heat-shrinkable film has a hot-water shrinkage and a shrinkage stress which satisfy given ranges.

Provided are polymer compositions comprising copolyesters comprising 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) and cyclohexanedimethanol (CHDM) residues which exhibit substantially improved impact toughness and coefficient of friction reduction while physical properties such as heat distortion temperature (HDT) and flexural modulus, after modification, are maintained compared to un-modified compositions.

The invention relates to a method and a system for continuously producing 1, 4-cyclohexanedimethanol, and belongs to the technical field of preparation of 1, 4-cyclohexanedimethanol. The problems of high raw material price, expensive catalyst, low production efficiency, harsh reaction conditions and the like in the existing 1, 4-cyclohexanedimethanol production process are solved. The method comprises the following steps: chloridizing p-xylene to prepare p-xylylene dichloride, hydrolyzing the p-xylylene dichloride to prepare terephthalyl alcohol, and hydrogenating the terephthalyl alcohol to prepare the 1, 4-cyclohexanedimethanol. The method takes p-xylene as a raw material, and is high in production efficiency, good in product quality, green, environment-friendly and low in energy consumption.