Abstract: A biodegradable polyester prepared from lactic acid, and, optionally, other hydroxy acid or acids. The polyester contains 4-100 carboxyl groups and has an average molecular weight of 1,000 to 200,000 g/mol. Also disclosed are methods of making such polyesters.

Abstract: Method for the preparation of a polymeric mixture for cable insulators and coatings and sheaths for optic fiber cables; polymeric mixture thus produced and the cables containing it.The method is characterized in that one completely mixes, up to the obtainment of a homogeneous composition, (i) from 50 to 80 parts (w/w) of a first thermoplastic polymer which is amorphous, highly resistant to flames and combustion, and consists of an aromatic polyester of isophthalic and terephthalic acid with bisphenol A, and (ii) from 20 to 50 parts (w/w) of at least a second thermoplastic polymer consisting of an elastomeric polyether-ester block copolymer, having a Shore D hardness greater than 50 and a Vicat softening point greater than 170.degree. C., for a mixing time less than 10 minutes.

Abstract: An epoxy-functional polyester storage-stable at temperatures of up to 40.degree. C. and having a Tg of more than 40.degree. C. is prepared by the reaction of an epoxy-functional polyester intermediate (III) produced by glycidating a carboxyl-functional polyester derived from (a) at least one secondary carboxyl groups-containing aromatic or cycloaliphatic dicarboxylic acid (anhydride), (b) at least one aliphatic hydroxyl groups-containing diol, (c) optionally, a compound containing one primary or secondary hydroxyl group, or a compound comprising one primary or secondary hydroxyl group and one tertiary aliphatic carboxyl group, (d) optionally, a compound comprising a tertiary aliphatic carboxyl group and two aliphatic hydroxyl groups and (e) optionally, a trihydroxyalkane or tetrahydroxyalkane; with (IV) a carboxyl-functional polyester obtained from (a) and (b) above, or (a) alone.

Abstract: The present invention discloses a process for producing molded, shaped or extruded articles comprising the steps of:a) melt reacting, in the presence of a catalyst which is substantially free of Co compounds, at least one glycol and at least one dicarboxylic acid to form a polyester having an I.V. of at least about 0.5 dL/g, wherein said at least one glycol is selected from the group consisting of glycols having up to 10 carbon atoms and mixtures thereof and said dicarboxylic is selected from the group consisting of alkyl dicarboxylic acids having 2 to 16 carbon atoms, aryl dicarboxylic acids having 8 to 16 carbon atoms and mixtures thereof;b) adding an acetaldehyde reducing additive to said polyester to form a reduced acetaldehyde polyester; andc) forming said reduced acetaldehyde polyester into articles directly from step b.Thus, the present invention provides a process for directly producing from the melt article having extremely low acetaldehyde content.

Abstract: A partially or fully cured thermosetting product which includes a cured and molded product of a thermosetting composition. The composition includes 70% to 99% by weight of at least one thermosetting resin or compound and 1% to 30% by weight of at least one toughening agent. The toughening agent is at least one hyperbranched dendritic macromolecule formed of ester units, optionally in combination with ether units.

Abstract: A polyester film, comprising a non-liquid crystal polyester (A) and a copolyester (B) containing mesogen groups in the main chain to form a phase separated structure in the non-liquid crystal polyester (A), and the dispersed domains of the copolyester (B), having forms to satisfy the following formulae (1) and (2):0.02<(I/J)<50 (1)K<1/2.times.S[I, J] (2)where I, J and K are form indicators expressing the average form of the plurality of domains existing in the film: I is the average length of the dispersed domains of the copolyester (B) in the machine direction of the film; J, that in the transverse direction; and K, that in the normal direction: and S is a function for selecting the shorter value of the lengths I and J; if I>J, S[I, J] means J, and if I<J, S[I, J] means I. If the copolyester (B) has such geometrical forms, the polyester film obtained is excellent in rigidity, high toughness, heat shrinkage, clarity, surface properties, long-time thermostability, electric properties, etc.

Abstract: The present invention describes a polyoxaester copolymers containing amines and/or amido groups and blends thereof with other polymers that may be used to produce surgical devices such as sutures, sutures with attached needles, molded devices, and the like. The polyoxaesters copolymer of the present invention is formed from a first divalent repeating unit of formula IA:[--C(O)--R.sub.30 --C(O)--] IAa second divalent repeating unit of the formula IB:[O--C(O)--C(R.sub.1)(R.sub.2)--O--(R.sub.3)--O--C(R.sub.1)(R.sub.2)--C(O)-- ]Iand a third repeating unit of the formula:[--O--R.sub.12 --].sub.U, XVIand optionally a fourth repeating unit with a formula selected from the group consisting of:[--O--R.sub.4 --].sub.A, II[--O--R.sub.5 --C(O)--].sub.B, III([--O--R.sub.5 --C(O)].sub.P --O--).sub.L G XIand combinations thereof wherein R.sub.12 contains an internal amine or internal amide group.

Abstract: A poly(hydroxy ester ether) is prepared by reacting a) a diacid containing a hetero moiety of the formula:HO.sub.2 CCH.sub.2 X(RX).sub.y CH.sub.2 CO.sub.2 Hwherein X is selected from the group consisting of --O--, --S--, and NH; y is the whole number 0 or 1; and R is selected from the group consisting of an aromatic moiety and a heterocyclic moiety having from 6 to 30 carbon atoms; andb) a diglycidyl ether generally represented by the formula: ##STR1## wherein R.sup.2 is an aromatic moiety or divalent aliphatic hydrocarbon having 2 to 20 carbon atoms. Films, articles and laminations made from the composition exhibit an oxygen permeability of less than about 8 cc-mil/100 in.sup.2 -24 hour-atmosphere. The present invention is further directed to a miscible blend having the poly(hydroxy ester ether) of the present invention and a second component selected from a saturated polyester of an aromatic diacid, such as PET and PEN.

Abstract: A thermoplastic resin composition comprising:(a) Alkylene aryl polyester copolymers having metal sulfonate units represented by the formula IA: ##STR1## or the formula IB:(M.sup.+n O.sub.3 S).sub.d --A--(OR"OH).sub.pwhere p=1-3, d=1-3, p+d=2-6, n=1-5, and A is an aryl group containing one or more aromatic rings where the sulfonate substituent is directly attached to an aryl ring, R" is a divalent alkyl group and the metal sulfonate group is bound to the polyester through ester linkages;(b) An essentially amorphous polycarbonate, polyester carbonate or polyarylate polymer containing recurring units of the formula II: ##STR2## wherein Ar is divalent aromatic residue of a dicarboxylic acid or mixture of dicarboxylic acids and Ar' is the divalent aromatic residue of a dihydric phenol or mixture of dihydric phenols. The composition may further comprise acidic phosphorus based quenchers, rubbery impact modifiers, mineral fillers or reinforcements.

Abstract: A tearable film comprising a resin blend which is: (1) a blend of a first polymer which is a styrenic polymer and a second polymer selected from the group consisting of a polyester and a polyamide; or (2) a first polymer which is a polyester and a second polymer selected from the group consisting of a polycarbonate, an acrylic polymer and a polyamide. The film has an continuous phase and a dispersed phase, thereby forming an islands-sea structure, wherein the continuous phase constitutes 35-98 wt % and the dispersed phase constitutes 2-65 wt % of the film.

Abstract: A thermoplastic resin composition includes (a) 1 to 99% by weight of a liquid crystalline polyester and (b) 99 to 1% by weight of a polyester as indispensable components, wherein the polyester is composed of the repeating units represented by the following formulas I, II and III in a specific ratio, ##STR1## wherein, X is --SO.sub.2 --, --CO--, --O--, --S--, --CH.sub.2 --, --CH.sub.2 --CH.sub.2 --, --C(CH.sub.3).sub.2 --, or a single bond; R.sub.1 represents an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 3 to 10 carbon atoms, a phenyl group, or a halogen atom; p is an integer of 0 to 4; m and n are integers of 1 to 4; a plurality of R.sub.1 on the same or different nuclei may be the same or different, and each p may be the same or different.

Abstract: Acrylate copolymers AB obtainable by polymerization of a monomer mixture A in an organic solvent or in bulk, the monomer mixture A comprising proportions by mass of from 25 to 80% of C.sub.1 -C.sub.20 -alkyl (meth)acrylates whose alkyl radicals can be linear, branched or cyclic, from 1 to 28% of C.sub.2 -C.sub.20 -hydroxyalkyl (meth)acrylates whose hydroxyalkyl radicals can be linear, branched or cyclic, from 0.5 to 20% of .alpha.,.beta.-unsaturated carboxylic acids and from 0 to 55% of aromatic vinyl compounds or aliphatic vinyl esters and vinyl ethers, vinyl halides, olefinically unsaturated ketones or aldehydes, esters of glycidyl alcohol or methylglycidyl alcohol with olefinically unsaturated carboxylic acids, or nitriles of .alpha.,.beta.

Abstract: There is a provided a method to produce a polymer composite material in which the rigid polymer (R.sub.m).sup.n is dispersed uniformly at the molecular level in the flexible polymer (M), preferably by both polymerization with no solvent in the molten and mixed state and subsequent polymerization in the solid state. According to the preferred embodiment of the present invention, the polymer composite material is produced by polymerization with no solvent in the molten and mixed state. In the case that the rigid polymer is polymerized from the monomer having a slow polymerization rate, in order to prevent roughness of the rigid polymer during polymerization, the polymerization in the molten state is stopped at the polymerization degree equal to that of an oligomer and the resulting composite is subsequently polymerized in the solid state to increase the polymerization degree of the rigid polymer.

Abstract: A polyester composition, comprising a thermoplastic polyester resin and hydroxy apatite particles with an average particle diameter of 0.01 to 10 .mu.m and a specific surface area of 50 to 500 m.sup.2 /g and represented by the following chemical formula, and a film made thereof. A polyester film excellent in such basic properties as slipperiness and abrasion resistance, and also in electric properties, perforability, processability as a laminate with a metallic sheet, flavor properties, etc. can be obtained.Ca(PO.sub.4).sub.l (OH).sub.m (CO.sub.3).sub.n Y.sub.x(where Y stands for any optional anions other than phosphate group, hydroxyl group and carbonate group, l=0.4.about.0.6, m=0.1.about.0.4, n=0.about.0.2, x=0.about.0.2, 3.times.l+m+2.times.n+z.times.

Abstract: Biodegradable polyether esters are obtained by reacting a mixture of(a1) from 95 to 99.9% by weight of polyether ester obtained by reacting(b1) a mixture comprising20-95 mol % of adipic acid or ester-forming derivatives thereof or mixtures thereof,5-80 mol % of terephthalic acid or ester-forming derivatives thereof or mixtures thereof, and0-5 mol % of a compound which contains sulfonate groups, and(b2) a mixture of dihydroxy compounds,(a2) from 0.1 to 5% by weight of a divinyl ether C1 and(a3) from 0 to 5 mol %, based on component (b1) from the preparation of P1, of compound D,and other biodegradable polymers and thermoplastic molding compositions, processes for the preparation thereof, the use thereof for producing biodegradable moldings, and adhesives, biodegradable moldings, foams and blends with starch obtainable from the polymers and molding compositions according to the invention.

Abstract: A crystalline resin molded article with a non-uniform appearance, or a process for making such an article, comprising a molded blend of a granular crystalline resin base resin and a granular crystalline resin colored concentrate which has contrasting color properties. The granular color concentrate comprising a crystalline resin carrier resin having a melting temperature sufficiently higher than the base resin for non-uniformly dispersing the granular color concentrate into the base resin during molding to produce a non-uniform appearance in said molded article.

Abstract: The polymer composite material is produced using no solvent and includes a rigid polymer (B) dispersed uniformly into a matrix (A) at the molecular level in a state of a copolymer (A/B and/or A'/B) thereby enhancing the interface bonding of the rigid polymer (B) to the matrix (A). The non-solvent method includes a step of polymerizing a thermoplastic polymer (A) and a monomer to form a rigid polymer (B) with no solvent in the molten and kneaded state to provide a copolymer (A/B and/or A'/B) in which the flexible molecular chains (A and/or A') are made up of the thermoplastic polymer to the rigid polymer (B) to reduce the stress concentrating sources of the rigid polymer dispersed microscopically at the molecular level in the thermoplastic polymer matrix and enhance the interface bonding between the rigid polymer (B) and the matrix (A).

Abstract: A method of molding which comprises preparing a molding material by compounding a filler and a curable composition, the filler being in an amount of 0 to 800 weight parts based on 100 weight parts of the curable composition and optionally aging the molding material at room temperature or by heating, followed by casting the molding material into a mold and curing the molding material under atmospheric pressure or higher, and articles molded by such method.

Abstract: Perfume is absorbed within organic polymer particles which have a further polymer at their exterior. The further polymer incorporates free hydroxyl groups and serves to promote deposition of the particles from a wash or rinse liquor. The further polymer may be part of an encapsulating shell, but more conveniently is used as a stabiliser during polymerisation of the particles. Highly hydrolysed polyvinyl alcohol is preferred.

Abstract: A thermoplastic resin composition comprising a thermoplastic resin (A) not forming an anisotropic melt phase and a liquid crystal polymer (B) capable of forming an anisotropic melt phase, an injection molding method thereof and an injection molded article capable of providing a thin molded article having excellent mechanical strength. A thermoplastic resin composition (C) comprises 99 to 50 wt. % of the thermoplastic resin (A) and 1 to 50 wt. % of the liquid crystal polymer (B). The liquid crystal polymer (B) is microscopically dispersed in an island form in the matrix phase of the thermoplastic resin (A) so that when the composition (C) is heat-treated at a temperature not lower than the melting point of the liquid crystal polymer (B) under a non-load state and is then cooled, the liquid crystal polymer (B) has a weight average particle diameter within the range of 10 to 40 micrometers and at least 80 wt. % thereof has a particle diameter within the range of 0.5 to 60 micrometers.

Abstract: A process for preventing dye redeposition during the washing of a dyed fabric or garment made from natural fibers, which process incorporates as a dye redeposition inhibiting agent, a water-soluble or water-dispersible polyester resin composition comprising a reaction product of 20%-50% by weight of terephthalate polymer or waste terephthalate polymer, 10-40% by weight of at least one glycol and 5-25% by weight of at least one oxyalkylated polyol.

Abstract: A composition comprising a polylactide polymer with improved extensional viscosity and methods of making the same are disclosed. The polylactide polymer composition is prepared by providing in the composition polylactide polymer molecules which have been modified, relative to linear non-substituted polylactide, to provide increased molecular interaction among polylactide backbone chains in the composition. The preferred polylactide polymer composition has a number average molecular weight of at least about 10,000 (preferably at least 50,000) and a polydispersity of at least about 2.5. In addition, the polylactide polymer composition should have a neck-in ratio of less than about 0.8.

Abstract: Hydroxyterminated PHA is produced by cultivating a PHA-producing microorganism in the presence of an aliphatic diol or an aliphatic polyol. High molecular weight hydroxy-terminated PHA is obtainable by the disclosed process, and is useful in the production of graft, block and random polymers and copolymers with other monomers, oligomers and polymers containing appropriate functionality and end group compatibility.

Abstract: Disclosed herein is a novel physical form of low molecular weight poly(trimethylene terephthalate). This form may be produced from molten low molecular weight poly(trimethylene terephthalate) material by means of rapid heat transfer from the material. The poly(trimethylene terephthalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight.

Abstract: There are provided liquid crystalline polyesters comprising 4'-hydroxy-4-stilbenecarboxylic acid type units, dicarboxylic acid units acting as a mesogen such as 4,4'-stilbenecarboxylic acid and catechol units as essential ingredients, and a liquid crystalline polyester composition comprising said polyesters and optically active liquid crystalline polyesters consisting essentially of 4,4'-stilbenedicarboxylic acid type units and aliphatic diol units having asymmetric carbons.

Abstract: The present invention relates to a polyethylene-2,6-naphthalate film comprising a resin composed mainly of polyethylene-2,6-naphthalate and having an intrinsic viscosity .eta. in the range of from 0.31 to 0.6, said film having stretch ratios of 1 to 3 times and 1 to 3 times or 3 to 6 times and 1 to 1.8 times respectively in substantially mutually perpendicular directions and a thickness in the range of from 5 to 150 .mu.m;a polyethylene-2,6-naphthalate resin comprising a blend composed mainly of two components of: a polyethylene-2,6-naphthalate resin having an intrinsic viscosity in the range of from 0.3 to 0.5 dl/g and prepared by an esterification reaction of a dicarboxylic acid having a 2,6-naphthalenedicarboxylic acid content of not less than 90% by mole with a glycol having an ethylene glycol content of not less than 90% by mole, or a transesterification and a polyethylene-2,6-naphthalate resin having an intrinsic viscosity in the range of from 0.5 to 0.

Abstract: The present invention relates to articles of manfacture, such as films, tubes, and coatings, comprising a multiaxially oriented film having a planar morphology, wherein the article of manfacture comprises at least one thermoplastic flexible polymer, at least one thermotropic liquid crystalline polymer, or a blend thereof. Recyclable articles of manufacture having improved barrier properties are also provided.

Abstract: A liquid crystalline resin which comprises at least one kind of liquid crystalline polymer selected from liquid crystalline polyester and liquid crystalline polyester amide, both forming an anisotropic molten phase, and an inorganic phosphorus compound, said liquid crystalline resin having an absorbance of 0.5 or less at 380 nm when measured over an optical path length of 10 mm in a 0.5 wt % solution in a 1:1 mixed solvent of pentafluorophenol and chloroform (by weight). It is useful as engineering plastics because of improved color, heat resistance, and hydrolytic resistance.

Abstract: Poly(alkylene arylates) having excellent optical properties are disclosed and can be prepared using an organic titanate-ligand catalyst solution containing organic silicates and/or zirconates and, preferably, certain phosphorus compounds.

Abstract: Polyester resins containing up to 5% by weight of a polymeric liquid crystal and an upgrading agent capable of increasing the I.V. of the resin by polyaddition reaction in the solid state with the end groups of the resin. Fibers, films and biaxially oriented articles obtained from the resins.

Abstract: A resin composition comprising an inorganic filler in the form of fiber or plate compounded in a liquid crystal polyester resin composition obtained by compounding 10 to 150 parts by weight of a liquid crystal polyester (B) into 100 parts by weight of a liquid crystal polyester (A), wherein the liquid crystal polyester (A) has a flow temperature of from 310 to 400.degree. C., the liquid crystal polyester (B) has a flow temperature of from 270 to 370.degree. C., the difference between the flow temperature of the liquid crystal polyester (A) and the flow temperature of the liquid crystal polyester (B) is from 10 to 60.degree. C., and the content of the inorganic filler is from 15 to 180 parts by weight based on 100 parts by weight of the total amount of the liquid crystal polyester (A) and the liquid crystal polyester (B).The resin composition is excellent in thin-wall flowability and can provide a molded article having excellent heat resistance and low warpage, and can provide a super thin-wall molded article.

Abstract: Polyesterdiols having low viscosities of less than 3500 cps, high content of non-volatile matter in excess of 96 wt %, and narrow molecular weight distribution of less than about 1.4 are prepared by esterification of one or more aliphatic dicarboxylic acids or ester derivatives thereof using at least a 1.5 molar excess of one or more aliphatic diols until an acid number of less than 20 is achieved, and stripping excess diol from the polyesterdiol reaction product. Where esterification catalyst is used, catalyst is substantially removed prior to stripping excess unreacted diol from polyesterdiol reaction product. The polyesterdiols so produced are useful as (i) curable components in thermosettable resin compositions, particularly compositions essentially free of volatile organic solvent and also containing a crosslinking agent and a reactive hardening agent: and/or (ii) useful as coatings, paints and adhesives, providing coatings with very low content of volatile organic compounds.

Abstract: A novel polyester film and a process for its preparation are disclosed wherein said film is composed of (a) liquid crystal polyester; (b) non-liquid crystal polyester; and (c) fiberizer capable of substantially fiberizing said liquid crystal polyester (a). Said polyester film shows remarkable improvements in various properties compared with the prior art polyester films: polyester film according to the present invention exhibits: (a) a high modulus of elasticity; (b) a high toughness; (c) a small content of: (1) oligomer, (2) thermal decomposition products and (3) gelation products; and (d) excellent electrical properties, so that this film can be used as a base film for electrical insulating material, capacitors, magnetic recording mediums, etc.

Abstract: The refillable polyester bottle of the invention has a mean crystallinity of 32 to 70% at the bottle body, a methanol adsorption of 1,500 ppm or less at the same portion and a paraxylene adsorption of 300 ppm or less at the same portion. Therefore, the bottle is excellent in non-adsorptivity and heat resistance. According to the method of removing adsorbates on a polyester bottle of the invention, the adsorbates can be rapidly desorbed by holding the bottle in air of 40 to 150.degree. C. or bringing the bottle into contact with water or water vapor heated at 40 to 150.degree. C.

Abstract: The present invention relates to a multilayer polyester sheet comprising:a base layer comprising a thermoplastic polyester resin (A) having a glass transition temperature of not less than 80.degree. C., anda sealing layer comprising a thermoplastic polyester resin (B) having a glass transition temperature at least 5.degree. C. lower than that of the base layer and laminated on at least one side of the base layer,said multilayer polyester sheet being a substantially non-stretched transparent sheet.

Abstract: A process for the preparation of an esterification product comprises reacting a polyfunctional organic acid or anhydride and a cyclic organic carbonate compound in the presence of a catalyst to form an esterification product. The catalyst comprises a quaternary ammonium salt and a component selected from the group consisting of a metal, a salt of a metal, and mixtures thereof.

Abstract: This invention relates to the synthesis from PET (virgin, recycled, post consumer, or precursor raw materials) of novel water dispersible or water emulsifiable polyester resins having improved hydrophobicity or non-polar characteristics. These characteristics give the applied film of these dispersions or emulsions much improved water repellency while at the same time retaining their redispersible or reemulsifiable properties. Such resins can be used for many applications in the paper, textile, coatings, paint, construction, and other industries.

Abstract: A biaxially stretched polyester film for forming a container, characterized by being formed of a polyester substantially consisting of an ethylene terephthalate unit and an ethylene naphthalate unit, the refractive index in the direction of thickness of the film being 1.5 or greater. This film is not only excellent in the formability during formation into cans or the like, but has excellent properties in taste property, particularly, the taste property after the retorting, and may be suitably used for containers produced by forming process and, particularly, for metallic cans.

Abstract: Novel golf ball compositions which contain liquid crystalline polymers and liquid crystalline polymer blends. These compositions can be foamed or unfoamed. Golf balls that employ at least one layer of these blends in any of the golf ball cover, core, or a mantle situated between the cover and the core provide ball properties and performance similar to and in some cases better than the state of the art ionomer based golf balls.

Abstract: Visually clear thermoplastic resin compositions include a polyetherimide resin, a first polyester resin and a second polyester resin, wherein from 50 to 100 mole percent of the structural units of the first polyester resin include an alicyclic hydrocarbon radical as the diol residue of the structural unit, and wherein less than 50 mole percent of the structural units of the second polyester include an alicyclic hydrocarbon radical as the diol residue of the structural unit, exhibit resistance to elevated temperature and improved impact properties.

Abstract: Biodegradable polymers comprising a polyether ester P1 obtained by reactinga first mixture of20-95 mol% of adipic acid or ester-forming derivatives thereof or mixtures thereof,5-80 mol% of terephthalic acid or ester-forming derivatives thereof or mixtures thereof, and0-5 mol% of a compound containing sulfonate groups,and a second mixture of15-99.8 mol% of a dihydroxy compound selected from the group consisting of C.sub.2 -C.sub.6 -alkanediols and C.sub.5 -C.sub.10 -cycloalkanediols,85-0.2 mol% of a dihydroxy compound IHO--?(CH.sub.2).sub.n --O!.sub.m --H(n=2, 3 or 4, m=2-250)with0-5 mol%, based on the first mixture, of a compound D having at least three groups capable of ester formation,and a bisoxazoline C1, their preparation and their use in the manufacture of biodegradable molding materials.

Abstract: This invention is a thermoplastic saturated polyester low profile additive (low profile additive) useful in sheet molding compounds for parts, especially vehicle parts. The additive has a major component derived from aromatic compounds such as terephthalic acid including recycled polyethylene terephthalate. Asymmetrical glycols are an important ingredient and can be used to digest recycled PET to make oligomeric glycols which are reacted with acids having fewer than 12 carbon atoms to make one of the low profile additives of this invention.

Abstract: Polyester blends of polyethylene terephthalate and polyethylene isophthalate coated with an alkylene carbonate such as ethylene carbonate or propylene carbonate crystallize more quickly and at lower temperature than uncoated pellets, reducing the tendency of the pellets to stick together during the crystallization process prior to solid-state polymerization.

Abstract: The invention relates to a preparation process of aliphatic polyester, comprising using an ion exchange resin as a drying agent and after the dehydration polycondensation reaction, regenerating and drying the used ion exchange resin and repeatedly using said ion exchange resin in the next dehydration polycondensation reaction, in a process for preparing aliphatic polyester from one or more aliphatic compound (A) by heating in an organic solvent in the presence of a catalyst, distilling a generated water containing organic solvent out of the reaction system, treating the distilled organic solvent with a drying agent, and returning the treated solvent to the reaction system to progress a dehydration polycondensation reaction. The process of the invention enables one to steadily and efficiently prepare in industry an aliphatic polyester having an excellent color tone, high molecular weight and high quality.

Abstract: A biaxial oriented polyester film which is obtained by using as a main raw material a mixture comprising a thermoplastic polyester resin (i) wherein an acid component is mainly composed of a terephthalic or naphthalenedicarboxylic acid component and a thermoplastic polyester resin (ii) having substantially a phase-separated form to the resin (i), and orienting an unoriented sheet of the mixture wherein an illuminance anisotropic ratio (IAR) of transmitted scattering light satisfies the following condition of 0.1.ltoreq.IAR.ltoreq.1.0.

Abstract: Polyester compositions containing terephthalate, 2,6-naphthalate and/or isophthalate moieties, and showing improved properties are disclosed.

Abstract: This invention relates to a polyester composition comprising:(A) 95 to 99.90% by weight of a polyester comprising from about 85 to 100 mole % of 2,6-naphthalenedicarboxylic acid and 85 to 100 mole % of at least one aliphatic glycol having from 2 to 16 carbon atoms, based on the total mole percentage for the glycol portion and for the acid portion of said polyester each equalling 100 mole %, and(B) 0.1 to 5.0% by weight of one or more polymeric carbodiimides.These polyester compositions result in improved hydrolytic stability in end products such as fiber, monofilament, films, thermoformed articles, containers and sheeting based on naphthalenedicarboxylic acid and ethylene glycol.

Abstract: Disclosed is a thermoplastic composition comprising an unreacted mixture of a poly(lactic acid) polymer; a polybutylene succinate polymer or a polybutylene succinate adipate polymer, or a mixture of such polymers; and a wetting agent. The thermoplastic composition exhibits substantial biodegradable properties yet is easily processed. The thermoplastic composition is useful in making multicomponent fibers or nonwoven structures that may be used in a disposable absorbent product intended for the absorption of fluids such as body fluids.

Abstract: Process for controlling the rate of change of intrinsic viscosity and transesterification during solid stating of a polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) blend, with an effective amount of an ethylene glycol compound. The process enables the production of a copolymer based on predefined initial and final IV's and final transesterification level, by varying the solid-stating time and/or effective amount of ethylene glycol. In one embodiment, a relatively greater amount of post-consumer PET (e.g., 70%) having an IV of on the order of 0.72-0.73, is incorporated in the blend to provide a final IV on the order of 0.80-0.85, and a moderate, controlled level of transesterification; the blend is used to injection mold a sleeve layer of a preform. In another embodiment, a substantially transparent neck finish for a preform is made from a PEN/PET blend having an amount of ethylene glycol which enables substantial transesterification, without excessive increase in IV.

Abstract: A polyester resin for a toner whereina ratio of insoluble material in THF is comprised at 5 weight % or less,a ratio of soluble polymer having a molecular weight of 1.times.10.sup.6 or greater in THF is comprised at a range of 1 weight % to 10 weight %,a soluble polymer having a molecular weight greater than 1.times.10.sup.5 in THF is comprised in a range of 10 weight % to 20 weight %, and the following relationship is satisfied W1>W2wherein a ratio of a soluble polymer having a molecular weight less than 1.times.10.sup.4 in THF is shown by W1, a ratio of a soluble polymer having a molecular weight greater than 1.times.10.sup.4 and less than 1.times.10.sup.5 in THF is shown by W2.