MXPA98002021A - Polyalykylene steres as plasticizers and flow auxiliators in polyo resins (tereftalatode 1,4-ciclohexandimetile - Google Patents

Abstract

The present invention relates to: The present invention relates to: This invention relates to the composition of a polyester comprising a mixture of: (A) 99.5 to 75% by weight of a copolyester having an inherent viscosity of 0.1 to 1.2 dl / g and having a melting point greater than 250 ° C, comprising: (a) one or more dicarboxylic acids, and (b) a glycol component comprising at least 80% mol of 1,4-cyclohexanedimethanol; B) from 0.5 to 25% by weight of one or more polyalkylene esters, where the percentages by weight of all the compounds in such mixture give 100% by weight tot

Description

POLYE ETERS QÜI ENO AS PLASTICIZERS AND AUXILIATORS OF FLOW IN POLYON RESINS (1,4-CYLOHEXANDIMETHYLENE TERHETHYLATE) DESCRIPTION OF THE INVENTION This invention relates to the mixture of poly (1,4-cyclohexanedimethylene terephthalate) (PCT) resins with one or more polyalkylene ethers. The viscosity velocity of the melt and the crystallization as a function of temperature are often critical in a molding injection process in semicrystalline thermoplastic technologies. The viscosity of the melt is critical, since it governs the filling of the molds in part (under the viscosity of the melt tends to fill the mold faster and the ability to fill small parts) and it is also desirable to minimize this important parameter . The crystallization rate as a function of temperature is critical since it controls the optimum molding temperature and the process cycle time. It is desirable to operate molding temperatures of less than 110 ° C as this allows the use of traditional water heating contrary to oil heating. It is also economically desirable to operate at such a temperature to allow an optimum rate of crystallization and to be transferred in short periods of time.

The use of a plasticizer is generally known by some polyesters to increase these two critical parameters.The polyalkylene ethers are known plasticizers for low melting point polyesters such as polybutylene terephthalate (PBT) and polyethylene terephthalate. ) (PET), but its sensitivity to thermal degradation is known Polyalkylene ethers are reported to be degraded when temperatures exceed 250 ° C, as established by K. itsiepe (Adv. Chem. Ser., No. 129, 39-60, 1973.) A plasticizer will typically lower the viscosity of the melt and give the temperature transmission of the glass in thermoplastic which will allow a larger portion of crystallization at a low temperature. polyesters are low molecular weight organic esters such as neopentyl glycol dibenzoate (Benzoflex S312) and β-polypylene glycol dibenzoate (Bepzc). lex 5-85 '. The use of plasticizers in semicrystalline polymers technology to improve molding is well known in the art. In addition, the need for, and use of, improved plasticizers in semicrystalline polyesters are well known in the art. Polyalkylene ethers have been used as plasticizers because they are low melting point polyesters such as PBT and PET, but sensitivity to thermal degradation is known. Indeed, U.S. Patents 4,548,978 to Garrison, Jr., 5,028,647 to Haylock et al, 4,914,145 to Tohdon et al, 4,558,085 to Lee, and 5,004,817 to Bastioli et al and JP Patent 1,256,562 to Hará et al teach use of polyalkylene oxides such as polyethylene glycol as p -stifiants in polyethylene terephthalate. However, E. A. Flexman reports in Adv. Chem. Ser., 233 (Toughened Plastice TJ, 79-104 1993) that many additives are used for the properties of low melting point polyesters, such as PBT, which are not useful in high point polyesters. Fusion because significantly high temperature processes require degradation of additives.The degraded polyalkylene ethers with temperatures exceeding 250 ° C, are reported by WK Wi-sie e 'Adv. Chem. Ser., Se. IZr .. ~ - = - Z, 1973). In fact, the combustion point of polyethylene glycol liquor is reported at 243 ° C, demonstrating its poor thermal stability. Polyethylene glycol, when exposed to high temperatures, has a degradation reaction. Furthermore, it can be expected that the polyalkylene ethers can not be useful as plasticizers for semicrystalline polymers with melting points greater than 250 ° C. This is reported by Witsiepe (Adv. ChemP Ser., No. 129, 39-60, 1973) that the optimum reaction temperature for polyether esters is 250 ° C because the degradation temperature of polyalkylene ether occurs. In US Pat. No. 4,438,233 describes the practice of "crowned at the end" to the polyalkylene ether to increase the thermal stability so that it can be processed at high temperatures but not exceeding 2: ccC. U.S. Patents 3,763,109 to Witsiepe and 3,856,749 to Hoeschele, both describe methods of stabilizing polyalkylene ethers for high temperatures. These patents teach the need to add stabilizers to provide the polyalkylene ethers with sufficient thermal stability to withstand temperatures above 170 ° C. Further, U.S. Patent 4,541,884 to Cogswell teaches the need for the plasticizer to be stable to melting at least in the temperature process of the matrix polymer. U.S. Patent 5,389,710 is of interest because it describes the polyester composition comprising a rcllysee such as PCT or PET and an effective amount of a certain type of a, omega-bis (aminoalkyl) polyoxyalkylene, crystallization modifier which is required to react chemically with the PCT or PET composition. These modifiers require an amino group. This invention relates to the composition of a pol ester comprising a mixture of:;TO; 99.5 to 75% by weight of a copolyester having an inherent viscosity of 0.1 to 1.2 dl / g and having a melting point in excess of 250 ° C, comprising: a _ cc plus dicarboxylic acids, and (b) a component glycol which comprises at least 80% mol of 1,4-cyclohexanedimethanol; and (B) from 0.5 to 25% by weight of one or more polyalkylene ethers, wherein the percentages by weight of all components in the total mixture is 100% by weight. The mixture of one or more polyalkylene ethers with the copolyester used in the invention results in a decrease in the viscosity of the melt and in the transition temperature of the copolyester glass. It is unexpected that polyalkylene ethers could cause these results for semicrystalline polymers with melting points greater than 250 ° C such as the copolyesters of the invention.

Poly (1,4-cyclohexanedi ethylene terephthalate) (PCT) resins significantly require a higher processing temperature than PET resins and much higher than the processing temperature of PBT resins due to their high melting point ( 295 ° C). This high PCT melting point also requires process temperatures greater than 300 ° C, which is expected to degrade the polyalkylene ethers. However, the invention demonstrates that the polyalkylene ethers of the invention decrease the melt viscosity of the matrix polymer and that at the glass transition temperature in this way improves the processability of the PCT without degrading the properties mechanical The addition of such polyalkylene esters decreases the melt viscosity of the PCT composition alone or when the PCT resin is reinforced with glass fibers. Since the plasticizers lower the transition temperature of the PCT glass, thus increasing the crystallization rate, this also allows the use of molding temperatures of < 110 ° C. While not linked to any other theory, these observations suggest that, when mixed with PCT, polyalkylene ethers exhibit an unexpected improvement in thermal stability, allowing them to withstand the high processing temperatures.

More particularly, this invention relates to the composition of the polyester comprising a mixture of: (Al 99.5 to 75, preferably 99.5 to 85, more preferably 99 to 90, and even more preferably 97 to 93% by weight of a copolyester having an inherent viscosity of 0. 1 to 1.2 dl / g, and that it has a melting point in excess of 250 ° C, comprising: (a) one or more dicarboxylic acids, and (b) a glycol component comprising at least 80, preferably at least 90, most preferably at least 95% by mol of 1, -cyclohexanedimethane; and (B) from 0.5 to 25% by weight of one or more polyalkylene ethers, wherein the percentages by weight of all components of such polyester composition is equal to 1CC% by weight. It is preferred that the dicarboxylic acid component comprises at least 90, preferably 55 mol% terephthalic acid. In this case, it is preferable that the dicarboxylic acid component of the copolyester can comprise repeating units of from 10 mol% or less of one or more dicarboxylic acids together with terephthalic acid, or suitable synthetic equivalents such as dimethyl terephthalate.

Useful dicarboxylic acids in the dicarboxylic acid component of the invention include, but are not limited to, aromatic dicarboxylic acids preferably having from 6 to 14 carbon atoms, preferably aliphatic dicarboxylic acids having from 4 to 12 carbon atoms, or preferably cycloaliphatic dicarboxylic acids having from 8 to 12 carbon atoms. Particularly preferred examples of dicarboxylic acids other than terephthalic acid to be used in the copolyester formation of the invention are: isophthalic acid, naphthalene-2-dicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 1,4-acid cyclohexanediacetic acid, diphenyl-4,4'-dicarboxylic acid, succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, and the like. Of these dicarboxylic acids to be included with terephthalic acid, isophthalic acid is preferred. The copolyesters may be prepared from one or more of the above dicarboxylic acids. It should be understood that the dicarboxylic acid can be reached from the corresponding acid anhydrides, esters, and acid chlorides of these acids. The glycol component may comprise up to 20 mol%, preferably up to 10 mol%, of one or more of the aliphatic or alicyclic glycols.

Such additional diols include cycloaliphatic diols, preferably having from 6 to 20 carbon atoms or preferably aliphatic diols having from 2 to 20 carbon atoms. Examples of such diole are: ethylene glycol, diethylene glycol, triethylene glycol, propan-1,3-diol, butan-1,4-diol, pentan-1,5-diol, hexan-1,6-diol, 3-methipepentinyl- (2 ,; , 2-methylpentanediol- (1, 4), 2,2,4-trimethylpentanediol- [1, 3), 2-ethylhexandicl- '1, 3), 2,2-diethylpropanediol- (1, 3), hexanediol- ( 1, 3), 1,4-di- (hydroxyethoxy) -benzene, 2,2-bis (4-hydroxycyclohexyl) propane 2,4-dihydroxy-1, -tetrapethyl-cyclobutane, 2, 2-bis- '3-hydroxyethoxyphenyl) -propane, decalindiol and 2,2-bis- (4-hydroxypropoxyphenyl) propane. The copolyesters can be prepared from two or more of the above diols. Ethylene glycol is a preferred glycol. The copolyester resins used in the context of this invention are well known and commercially available. Methods for their preparation are described, for example, in U.S. Patent 2,465,319 and 3,047,539. The polyesters of the invention preferably have an inherent viscosity of 0.1 to 1.2 dl / g, more preferably 0.1 to 0.9 dl / g, and even more preferably, 0.4 to 0.8 dl / g.

The copolyesters contain substantially only ethylene glycol, 1,4-cyclohexanedimethanol and terephthalic acid or substantially only ethylene glycol, 1,4-cyclohexanedimethanol, iscphthalic acid and terephthalic acid are preferred. It is particularly preferred that the copolyether used herein have a melting point above 25 ° C, preferably above 260 ° C. These polyalkylene glycols can be crowned at the end or not. By "crowned" at the end, we understand that the polymer is preferably crowned at the end when the terminal hydroxyl group reacts with epoxy-isocyanate or carboxylic acid compounds. Preferred polyalkylene ethers contemplated for use in the invention comprise compounds of the formula: wherein, m is an integer from 1 to 3, inclusive, n is an integer from 4 to 250 inclusive, X is selected from one or more of the groups consisting of CH3, C3H7, C2H5, and H, A is hydrogen, alkyl, acyl, aryl or aroyl of 1 to 10 carbon atoms, and B is hydrogen, alkyl, acyl, aryl or aroyl of 1 to 10 carbon atoms. Preferred polyalkylene ethers for use in the compositions of the present invention are those described above where m is one, or where n is 4 to 14, or where X is H. Most preferably, m is one, n is 4 to 14, and X is H. Even the most preferred piastifiers for use in the compositions of the present invention are those described above, where ee is one, c where n is 7 to 25, or where A is acyl of 8 carbon atoms or methyl, or where B is acyl of 8 carbon atoms, and especially where m is one, n is 7 to 25, X is H, A is acyl of 8 carbon atoms or methyl, and B ee acylc of 8 carbon atoms. Polyethylene glycol 400 bis (2-ethylhexanoate), methoxypolyethylene glycol 2- (ethylhexanoate and t-propylene glycol bis (2-hexanoate) are preferred.) Polyethylene glycol 400 bis (2-ethylhexanoate) is even more preferred. The invention is preferably selected from the group consisting of polyethylene glycol, polytetramethylene glycol and polypropylene glycol or mixtures thereof.

The current molecular weight of the poly (alkylene glycol) is not critical, however it is preferred that it be of sufficient molecular weight to prevent volatilization during the composition. It is preferable that the polyalkylene ethers have an average molecular weight number of 200 to 10,000, preferably 400 to 1,500. These polyalkylene glycols can be crowned at the end or not. By crowning at the end, it is understood that the polymer is preferably crowned at the end by reaction of the terminal hydroxyl group with epoxy, iso ian-ato c carboxylic acid compounds. It should be understood that other additives such as stabilizers, flame retardants, hardeners, epoxy compounds, mold release agents, core forming agents and colorants may be desirable in such formulations. Such additives are generally present from 0.1 to 20% by weight based on the total weight of the composition of such polyester. The flame retardants used include, but are not limited to, brominated polystyrene combined with sodium antimonate. Examples of reinforcing agents are glass fibers, carbon fibers, mica, clay, talc, olastonin, and calcium carbonate. A particularly preferred reinforcing agent is. fiberglass. It is preferred that the glass fibers are present in the polyester composition in from 0.1 to 40%, preferably from 0.1 to 30%, by weight based on the total weight of the polyester composition. Glass fibers suitable for use in the polyester compositions of the invention may be in the form of glass filaments, filaments, fibers, or strands, etc., and may vary in length from about 0.3175 cm (1/8 inch) ) to approximately 5. OS cm (2 inches). Cut glass strands having a length of about 0.3175 cm (1/8 inch) to about 0.635 cm (1/4 inch) are preferred. Such glass fibers are well known in the art. Of course, the size of the glass fibers can be greatly diminished, depending on the mixing medium used, even at lengths of 300 to 700 microns or lower. The polyester compositions of the invention may be reinforced with a mixture of glass and other reinforcing agents as described above, such as mica, or talc, and / or with other additives. The polyester compositions of the invention contain reinforcing agents which can be molded at molding temperatures below 120 ° C and are more easily molded without the need for expensive mold equipment by heating. The preferred molding temperature of the glass-filled polyester compositions of the invention is in the range of 20-110 ° C.

The components of the mixture of the invention can be mixed and / or mixed by suitable technology known in the art. The inherent viscosity (I.V.) of the copolyesters is determined in 60/40 (w / w) phenol / tetrachloroethane at a concentration of 0.5 g / 100 ml as determined at 25 ° C. The molded objects and films can be prepared from polyester compositions of the invention, including any preferred embodiment. Also, a method for lowering the vitreous transition temperature and melt viscosity of the copolyesters of the polyester composition of the invention is desirable using the polyalkylene ethers of the invention. In this method, all preferred embodiments of the polyester composition of the invention are also desirable. The following abbreviations are used in the T refers to the glass transition temperature; DSC refers to Differential Scanning Calorimetry. This invention may be further illustrated by the following examples of its preferred embodiments, although it will be understood that these examples are included merely for purposes of illustration and are not intended to limit the scope of the invention unless specifically indicated otherwise. Initial materials are commercially available unless otherwise indicated. The percentages mentioned are percentages by weight unless otherwise specified. Examples All the following examples are prepared using poly (1,4-cyclohexanedimethylene terephthalate) (PCT) having an inherent viscosity in the range of 0.65 to 0.75 dl / g as determined at 25 ° C using C.5 polymer grains per 100 ml of a solvent composed of 60% by weight and 40% by weight of tetrachloroethane. The abbreviations "PCT" in these Examples refer only to poly (1,4-cyclohexanedimethylene terephthalate). The polyalkylene ethers used are polyethylene glycol capped at the end of the hydroxyl functional group with ethylene hexanoate or by reacting in such a way that the polyethylene glycol ends are ethylesters of hexanoate (Plasticizer A) and polytetramethylene glycol (PTMG) (Plasticizer B). Benzoflex 312 (neopentyl glycol dibenzoate), a common plasticizer for polyesters, is included as a control. The compositions were prepared by mixing the desired components in an extruded screw apparatus with fixed temperatures at 300 ° C, extruded in a cold water bath and formed granules. All compositions are reported in percentages by weight based on the exception of the plasticizer concentration, which is reported in relative weight percentage only to the matrix resin. The thermal analysis (DSC) and viscosity measurements of the melt were carried out on the compounds in granules. The low efficiency of the plasticizer in the increase of the crystallization speed as well as in the decrease of the optimum temperature of the crystallization was determined by the evaluation of the temperature of crystallization in heating (Tch) by DSC with a sweep ratio of 20 ° C per minute after abruptly cooling the melt. An effective plasticizer will decrease the Tch. In addition to lower value of Tch, greater plasticizing effect. The viscosity of the melt was measured in r. capillary re-ee (Gottferd rheometer) at the specified frequency and temperature. The mechanical properties were evaluated in the injection molding specimens, following the ASTM methods as follows: the tensile strength and tensile elongation at breaking was determined by Method ASTM D638; Musca Izod was determined by the ASTM method rC? €; Flexural Resistance, Modulus and Breaking Deformation was determined by ASTM Method D790; and the Heat Deflection Temperature was measured at 264 psi using the ASTM Method D648. Comparative Example 1 shows poly (terephthalate 1,4-cyclohexanedimethylene) (PCT) composed of glass, but no plasticizer was added. The glass transition temperature is 89 ° C and the Tch is 133 ° C as reported in Table 1. This Tch is >110 ° C, indicating that it could not be molded with a moulder by heating it with water. In Table 2, the viscosity of the melt of Example 1 is reported as 295 Pa * s. Comparative Example 2 shows the PCT and the glass composite with 7.5% by weight of the commercial plasticizer Benzoflex 312. The vitreous transition temperature is decreased to 72 ° C, the Tch decreases to 114 ° C and the viscosity of the melt is carried to 212 Pa * s. All three measurements indicate that Benzoflex 312 is indeed an effective plasticizer for PCT. Examples of the invention, Examples 3-6 show PCT and glass compounds with polyalkylene ethers. Example 3 shows plasticizer A at 7.5% which decreases Tg and Tch at 56 ° C and 95 ° C, respectively. The viscosity of the melt of Example 3 is also decreased to 237 Pa * s compared to 299 Pa * s for the unplasticized PCT. This indicates that at the same level, the Piastificante A (polyethylene glycol topped with ethyl hexoate) is a more effective plasticizer than the Benzoflex 312 when considering the crystallization kinetics and is even more effective in reducing the viscosity of the melt. . Example 5 shows PCT and glass composed of 7.5% by weight of polytetramethylene glycol (PTMG). The PTMG decreases the Tg at 64 ° C, the Tch at 100 ° C and the viscosity of the melt at 196 Pa * s. The PTMG, when used at equivalent levels as Benzoflex 312, is a superior plasticizer in terms of both crystallization kinetics and viscosity of the melt. The polyalkylene ethers are effective plasticizers and the mechanical properties of the molded compounds are not degraded as reported in Table 3. This shows that polyalkylene ethers are better plasticizers for PCT than some of the conventional plasticizers despite the high temperatures of process required to melt the PCT. In the. Table 3, examples 2 and 3 are comparable formulations and Examples 2b and 5 are comparable. Example 2b is identical to example 1, except that the flame retardant is not added. The addition of the flame retardant alters the mechanical properties, so 2 and 5 are not comparable. Table 4 reflects the data comparing the stability of plasticizer A (PEG) to a mixture of PCT and plasticizer A. The value of "1% by weight of loss in air" is measured by dynamic analysis of thermogravimetry (TGA) at 20 ° C, increasing in temperature per minute. The value of "% by weight loss at 300 ° C for 30 minutes" is measured by isothermal TGA. One can expect that the Plasticizer A can itself be stable or more stable than the Plasticizer A mixed with the PCT. However, these data show that the mixture of PCT and Plasticizer A is more stable than Plasticizer A alone.

TABLE 1 Thermal Analysis of the Viscosity of Reinforced Glass of PCT at 30% Example Plasticizer or by pß $ 0 dß | Tg < ° C) Tch < ßC) TM (ßC) Plasticizer 1 None 89 133 291 2 Bßnzoflex 312 7.5 72 114 289 3 Plasticizer A 7.5 56 95 282 4 Plasticizer A 3.75 77. 5 121 290 PTMG 7.5 64 100 290 6 PTMG 5.0 75. 5 116 289 TABLE 2 Viscosity of the melt of the 30% PCT Reinforced Glass Example Plasticizer% by weight of the Viscosity of the melt Plasticizer (Pa * s > * 1 None - -299 2 Benzoflex 312 7.5 212 3 Plasticizer A 7.5 237 4 PTMG 7.5 196 * Measured at 30-5 ° C, with a cutting speed of 400 seconds-1 and reported in Pa * s TABLE 3 Mechanical Properties of 30% PCT Reinforced Glass EXAMPLE 2 EXAMPLE 3 EXAMPLE 2b EXAMPLE 5 Resistance to Voltage 130.0 + 5 125.5 + S 118.5 + 5 108.0 + 5 (MPa) Lengthening Voltage 1.8 + 0. 1.9 + 0.2 1.6 + 0.2 1. 7 + C .2 at Break (%) Notch lzod @ 64.0 + 5 69.0 + 5 96.0 + 5 96.0 + 5 23ßC (Joules / meter) Resistance to Bending 189.0 + 5 179.0 + 5 155.0 + 5 146.0 + 5 (KP?) Flex Module 9, 310 + 600 8 , 760 + 600 8, 070 + 600 7, 170 + 600 (MPa) Bending Deformation 2 • 3 + 0.2 2. 3 + 0.2 2.1 + 0.2 2. 3 + 0.2 at Break (%) HDT ß 1.8 MPa 249 + 5 251 + 5 262 + 5 270 + 5 (° C) Table 4 THERMAL STABILITY COMPARISONS 1% per 10% per% by weight of weight of loss in air loss loss 8 300ßC during (air) ° C (air re 30 minutes Plastify you 123.0 20S.3 100.0 Plasticizer A + 0.25% irganox 1010 * 130.0 220.1 100.0 Plasticizer A + 0.5% Irganox 1010 »129.0 227.5 97.0 I-1 Plasticizer A + 1.0% Irganox 1010 * 132.0 234.9 95.0 PCT + 375% Plasticizer A 318.0 392.9 2.7 PCT Control 362.0 398.2 1.2 Irganox 1010 is an additive which is a blocked phenol The invention has been described in detail with particular reference to its preferred embodiments, but it will be understood that variations and modifications may affect the spirit and scope of the invention. In addition, all patents, patent applications (published and unpublished, foreign or national), literary references? other publications mentioned above are incorporated for reference by any description pertinent to the practice of this invention.

Claims (1)

1. CLAIMS 1. A polyester composition, characterized in that it comprises a mixture of: (A) from 99.5 to 75% by weight of a copolyester having an inherent viscosity of 0.1 to 1.2 dl / g and having a melting point in excess of 250 ° C, comprising: (a) one or more dicarboxylic acids, and (b) a glycol component comprising at least 80% mol of 1,4-cyclohexanedimethanol; and (B) 0.5 to 25% by weight of one or more polyalkylene ethers, wherein the percentages by weight of all components of such mixture is 100% by total weight. 2. the polyester composition according to claim 1, characterized in that one or more dicarboxylic acids comprises at least 90 mol% terephthalic acid. 3. The polyester composition according to claim 1, characterized in that the copolyester is present in an amount of 99.5 to 85% by weight. 4. The polyester composition according to claim 3, characterized in that the copolyester is present in an amount of 99.5 to 90% by weight. 5. The polyester composition according to claim 4, characterized in that the copolyester is present in an amount of 97 to 93% by weight. 6. The polyester composition according to claim 2, characterized in that the acid component comprises repeating units of 10 mol% or less of one or more dicarboxylic acids. The polyester composition according to claim 1, characterized in that the dicarboxylic acids are selected from the group consisting of terephthalic acid, cyclohexanedicarboxylic acid, isophthalic acid, 1,4-cyclohexanediacetic acid, diphenyl-4,4'-dicarboxylic acid , succinic acid, glutaric acid, adipic acid, azelaic acid, alendicarboxylic naph acid and sebacic acid. 8. The polyester composition according to claim 7, characterized in that the acid component comprises isophthalic acid. 9. The composition according to claim 7, characterized in that the acid component comprises 1,4-cyclohexanedicarboxylic acid. 10. The composition according to claim 7, characterized in that the acid component comprises naphicarboxylic acid. The polyester composition according to claim 2, characterized in that the additional dicarboxylic acids are selected from the group consisting of isophthalic acid, cyclohexanedicarboxylic acid, 1,4-cyclohexanediacetic acid, diphenyl-4,4'-dicarboxylic acid, succinic, glutaric acid, adipic acid, azelaic acid, naphthalenedicarboxylic acid and sebacic acid 12. The polyester composition according to claim 1, characterized in that the glycol component comprises 95 to 100% mol of 1,4-cyclohexanedimethanol. The composition according to claim 1, characterized in that the glycol component comprises up to 20 mol% of one or more of the aliphatic or alicyclic glycols. The composition according to claim 13, characterized in that the glycol component comprises up to 10 mol% of one or more of the additional aliphatic or alicyclic glycols. 15. The polyester composition according to claim 14, characterized in that one or more additional glycols are selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propanediol, butanediol, pentanediol, hexanediol, and tetramethylcyclobutanediol. 16. The polyester composition according to claim 15 characterized in that one or more additional glycols comprises ethylene glycol. 17. The polyester composition according to claim 1, characterized in that the polyalkylene ethers comprise the formula Wherein, m is an integer from 1 to 3, inclusive, n is an integer from 4 to 250, inclusive, X is selected from one or more of the groups consisting of CH3, C3H7, C2H5, and H, A is hydrogen, alkyl, acyl, aryl or aroyl of 1 to 10 carbon atoms, and B is hydrogen, alkyl, acyl, aryl or aroyl of 1 to 10 carbon atoms. 18. The polyester composition according to claim 17, characterized in that the polyalkylene ethers comprise polyethylene glycol, polytetramethylene glycol and polypropylene glycol. 19. The polyester composition according to claim 18, characterized in that the polyalkylene ether is poly (ethylene glycol). 20. The polyester composition according to claim 18, characterized in that the polyalkylene ether is polytetramethylene glycol. The polyester composition according to claim 18, characterized in that the polyalkylene ethers have an average number of molecular weight of 400 to 1500. 22. The polyester composition according to claim 1, characterized in that it also comprises one or more additives. 23. The polyester composition according to claim 22, characterized in that the additives are present from 0.1 to about 20% by weight based on the total weight of the polyester composition. 24. The polyester composition according to claim 22, characterized in that the additives are selected from the group consisting of stabilizers, flame retardants, hardeners, epoxy compounds, mold release agents, core forming agents, and colorants. 25. The polyester composition according to claim 1, characterized in that it comprises one or more reinforcing agents. 26. The polyester composition according to claim 25, characterized in that one or more reinforcing agents comprise glass fibers. 27. The polyester composition according to claim 26, characterized in that the glass fibers are present in the polyester composition from 0.1 to 40% by weight based on the total weight of the polyester composition. 28. The polyester composition according to claim 5, characterized in that the additives comprise flame retardants. 29. A molded object prepared for the composition according to claim 1. 30. A method for lowering the vitreous transition temperature and the viscosity of the melt of the polyester composition comprising a copolyester having an inherent viscosity of 0.1. at 1.2 dl / g and having a melting point in excess of 250 ° C, the copolyester is characterized in that it comprises: (a) one or more dicarboxylic acids, and (b) a glycol component comprising at least 80% mol of 1, 4-cyclohexanedimethanol; wherein the method comprises the step of adding to the polyester composition from 0.5 to 25% by weight of one or more plasticizing polyalkylene ethers, wherein the percentages by weight of the copolyester and one or more polyalkylene ethers are 100% by weight. total weight.