A process of producing an article by an extrusion blow molding manufacturing process is provided comprising: melting a copolyester in an extruder to produce a molten copolyester; extruding the molten copolyester through a die to form a tube of molten copolyester parison; clamping a mold having the desired finished shape around the parison; blowing air into the parison causing the parison to stretch and expand to fill the mold to produce a molded article; cooling the molded article; ejecting the article from the mold; and removing excess plastic from the article; wherein the copolyester comprises: at least one terephthalate monomer residue; ethylene glycol residues; a combination of diethylene glycol and at least one glycol residue selected from the group consisting of 1,4-cyclohexanedimethanol residues, monopropylene glycol residues, and 2,2,4,4-tetramethyl-1,3-cyclobutane diol residues; and a germanium catalyst present in the copolyester at a concentration of about 5 to about 500 ppm based on elemental germanium.

An article is provided comprising a copolyester; wherein the copolyester comprises: a. at least one terephthalate monomer residue; b. about 85 to about 96 mole % of ethylene glycol residues; c. about 4 to about 15 mole % of a combination diethylene glycol (DEG) and at least one glycol residue selected from the group consisting of 1,4-cyclohexanedimethanol residues (CHDM), monopropylene glycol residues (MPG), and 2,2,4,4-tetramethyl-1,3-cyclobutane diol residues (TMCD); and d. a germanium catalyst present in the copolyester at a concentration of about 5 to about 500 ppm based on elemental germanium; wherein the diacid monomer is based on the substantially equal diacid equivalents of 100 mole % to diol equivalence of 100 mole % for a total of 200 mole %.

A copolyester composition is provided comprising at least one copolyester and at least one polymeric component; wherein said copolyester comprises: a. terephthalate acid residues; b. about 85 to about 96 mole % of ethylene glycol residues; c. about 4 to about 15 mole % of a combination of diethylene glycol (DEG) residues and at least one glycol residue selected from the group consisting of 1,4-cyclohexanedimethanol residues (CHDM), monopropylene glycol residues (MPG), and 2,2,4,4-tetramethyl-1,3-cyclobutane diol residues (TMCD); and d. a germanium catalyst present in the copolyester at a concentration of about 5 to about 500 ppm based on elemental germanium; wherein the terephthalate monomer is based on the substantially equal diacid equivalents of 100 mole % to diol equivalence of 100 mole % for a total of 200 mole %.

A stretched polyester film and a method for preparing the stretched polyester film are disclosed. The stretched polyester film contains a polyester resin in which a diol component and a dicarboxylic acid component are polymerized, wherein the heat shrinkage rate of the film at 80 C. in the main shrinkage direction is 40% or more, and, upon a first thermal treatment and a second thermal treatment, a first melting temperature (T.sub.m1) and a second melting temperature (T.sub.m2) appear when the film is analyzed by differential scanning calorimetry (DSC). The stretched polyester film has excellent heat shrinkability, along with an increased efficiency of a recycling process of waste plastic containers.

A polyester resin including a unit derived from dicarboxylate (A) represented by the following formula (1), a unit derived from a diol having a cyclic structure (B) and a unit derived from a diol having a linear alkyl structure (C), wherein the polyester resin has a molecular weight dispersity (Mw/Mn, where Mw represents the weight average molecular weight and Mn represents the number average molecular weight) of 2.3 to 2.5.

##STR00001## (in the formula (1), R.sup.1 represents an alkyl group having 1 to 3 carbon atoms, R.sup.2 represents an alkyl group having 4 to 8 carbon atoms, and m represents an integer of 0 to 8).

A copolyester is provided comprising: a. at least one terephthalate acid residue; b. about 85 to about 96 mole % of ethylene glycol residues; c. about 4 to about 15 mole % of a combination of 1,4-cyclohexanedimethanol residues (CHDM) and diethylene glycol (DEG) residues; and d. a germanium catalyst present in the copolyester at a concentration of about 5 to about 500 ppm based on elemental germanium; wherein the terephthalate monomer is based on the substantially equal diacid equivalents of 100 mole % to diol equivalence of 100 mole % for a total of 200 mole %.

The present disclosure relates to a surface deposited supported germanium-based or titanium-germanium-based catalyst and preparation method therefor and use thereof. The catalyst comprises a carrier, a supported deposition layer, and an active component, and the preparation method comprises: carrying out a precipitation reaction on a suspension of the carrier, a water-soluble calcium salt, a water-soluble aluminum salt, a water-soluble zirconium salt with a water-soluble hydroxide and an alkali, filtering, and calcining to form the supported deposition layer on the carrier; carrying out a hydrolysis reaction on the suspension of the carrier with a germanium source and a titanium source to obtain a catalyst precursor; carrying out a reaction on the precursor with a silicate ester and water, and loading the active component on the supported deposition layer to obtain the catalyst. When used to catalyze the polymerization of PETG or PCTG, it can significantly improve the viscosity and hue qualities.

A method for manufacturing a polyester film for embossing. A part of a recyclable polyester material is recycled through a physical recycling process to obtain a physically regenerated polyester resin, and another part of the recycled polyester material is recycled through a chemical recycling process to obtain a chemically regenerated polyester resin. A polyester composition including the physically regenerated polyester resin and the chemically regenerated polyester resin is melted and extruded so as to form a base layer. The base layer is stretched in a longitudinal direction. A surface coating paste is coated onto the base layer. The base layer with the surface coating paste is stretched in a transverse direction, such that the surface coating paste turns into a surface coating layer, and a polyester film for embossing is obtained.

The present invention relates to a polyester fiber, a preparation method thereof and a molded article prepared therefrom. The polyester fiber comprises a diol moiety derived from isosorbide in a specific amount and is formed into a polyester resin having a specific oligomer content, thereby providing a molded article having excellent saline water resistance, chemical resistance, light resistance and good knot strength, and capable of maintaining high transparency.

The present disclosure relates to a surface deposited supported germanium-based or titanium-germanium-based catalyst and preparation method therefor and use thereof. The catalyst comprises a carrier, a supported deposition layer, and an active component, and the preparation method comprises: carrying out a precipitation reaction on a suspension of the carrier, a water-soluble calcium salt, a water-soluble aluminum salt, a water-soluble zirconium salt with a water-soluble hydroxide and an alkali, filtering, and calcining to form the supported deposition layer on the carrier; carrying out a hydrolysis reaction on the suspension of the carrier with a germanium source and a titanium source to obtain a catalyst precursor; carrying out a reaction on the precursor with a silicate ester and water, and loading the active component on the supported deposition layer to obtain the catalyst. When used to catalyze the polymerization of PETG or PCTG, it can significantly improve the viscosity and hue qualities.