An object of the present invention is to provide a method for producing a polyester resin composition with less coloring and less decrease in molecular weight even after several times of recycling with used polyester resins produced with at least one type of polymerization catalyst selected from the group consisting of an antimony compound, a titanium compound, and a germanium compound. The present invention contains a method for producing the polyester resin composition (C) comprising a step of mixing a polyester resin (A) collected for recycling and a polyester resin (B) containing an aluminum compound and a phosphorous compound, wherein the polyester resin (A) satisfies the following (1) to (3): (1) the polyester resin (A) comprises at least one element selected from the group consisting of antimony element, titanium element, and germanium element, (2) the polyester resin (A) comprises at least one of the antimony element, the titanium element, and the germanium element at a total content of from 2 to 500 ppm by mass, and (3) the polyester resin (A) has an intrinsic viscosity of from 0.5 to 0.8 dl/g.

The present disclosure generally relates to embodiments for the renewable and sustainable process of recovering PHA from microbial biomass. Several embodiments relate to systems and individual devices or groups of devices to accomplish efficient PHA recovery from microbial biomass. Some embodiments further relate to processes for recycling certain reagents or materials used in the process for subsequent re-use in processing additional microbial biomass to recover PHA.

The present invention relates to methods for the preparation of high molecular weight polyhydroxybutyrate (PHB) by culturing Bacillus megaterium strains in a mixture of agri-food wastes, PHB obtained or obtainable by the methods as well as to its use in the preparation of articles such as, for example, soles and/or heels for shoes.

The present invention relates to methods for the preparation of high molecular weight polyhydroxybutyrate (PHB) by culturing Bacillus megaterium strains in a mixture of agri-food wastes, PHB obtained or obtainable by the methods as well as to its use in the preparation of articles such as, for example, soles and/or heels for shoes.

A continuous process for preparing a polyester shrinkable film includes: pumping an amorphous PET-based polyester melt having a melt viscosity 1 directly from a polymerization reactor into a first cooling zone; cooling the polyester melt to increase the melt viscosity thereof to a melt viscosity 2 such that a difference between 2 and 1 ranges from 1500 poise to 3500 poise; feeding the polyester melt into a second cooling zone; cooling the polyester melt to increase the melt viscosity thereof to a melt viscosity 3 ranging from 5000 poise to 12000 poise such that a difference between 3 and 2 ranges from 1000 poise to 5500 poise; and pumping the polyester melt from the second cooling zone into a zone for film-forming treatment.

The present invention relates to polyester polyols made from aromatic polyacid sources such as thermoplastic polyesters. The polyols can be made by heating a thermoplastic polyester such as virgin polyethylene terephthalate, recycled polyethylene terephthalate, or mixtures thereof, with a glycol to give a digested intermediate which is then reacted with a digestible polymer, which can be obtained from various recycle waste streams. The polyester polyols comprise a glycol-digested polyacid source and a further digestible polymer. The polyester polyols provide a sustainable alternative to petrochemical or biochemical based polyester polyols.

The present invention relates to polyester polyols made from aromatic polyacid sources such as thermoplastic polyesters. The polyols can be made by heating a thermoplastic polyester such as virgin polyethylene terephthalate, recycled polyethylene terephthalate, or mixtures thereof, with a glycol to give a digested intermediate which is then reacted with a digestible polymer, which can be obtained from various recycle waste streams. The polyester polyols comprise a glycol-digested polyacid source and a further digestible polymer. The polyester polyols provide a sustainable alternative to petrochemical or biochemical based polyester polyols.

A catalysts for poly(lactide) synthesis having the structure of Formula I: ##STR00001##
wherein R.sub.1 and R.sub.2 is, independently, C.sub.1-C.sub.6 alkoxy, and R.sub.3 arylalkyl or substituted phenyl are disclosed. Method of synthesizing the catalysts and method of using the catalysts to prepare poly(lactides) and compositions comprising the catalyst are also disclosed.

A catalysts for poly(lactide) synthesis having the structure of Formula I: ##STR00001##
wherein R.sub.1 and R.sub.2 is, independently, C.sub.1-C.sub.6 alkoxy, and R.sub.3 arylalkyl or substituted phenyl are disclosed. Method of synthesizing the catalysts and method of using the catalysts to prepare poly(lactides) and compositions comprising the catalyst are also disclosed.

The present invention relates to a method for manufacturing polydioxanone particles (PDO) for a filler, more particularly to a method for manufacturing polydioxanone particles, which includes a step of mixing a solution of polydioxanone dissolved in a perfluoroalcohol with a polymer emulsion containing a polyethylene oxide-polypropylene oxide-polyethylene oxide terpolymer at a predetermined ratio to generate polydioxanone particles and then recovering the polydioxanone particles through aging and washing. The polydioxanone particles manufactured by the manufacturing method of the present invention can be favorably used as an injection for regenerating skin tissues.