A method of making a non-solid state polyester that includes: a) reacting terephthalic acid and ethylene glycol; b) removing the water continuously; c) polymerizing the monomers and oligomers in vacuum conditions at a temperature to form molten polyester having an IV (intrinsic viscosity) of about 0.7 to 0.85 dl/g; d) extruding the molten polyester through a die; e) cutting and quenching the molten polyester, forming polyester pellets; f) drying the polyester pellets and transferring the polyester pellets to a storage vessel; g) transferring the polyester pellets to the upper end of a conditioning vessel while a countercurrent flow of air is circulated through the polyester pellets; and h) transferring the polyester pellets to the top of a crystallizer vessel to form a bed of polyester pellets flowing by gravity towards the bottom of the vessel while a countercurrent flow of nitrogen is circulated through the bed, and heating the polyester pellets, wherein increase of the IV of the polyester pellets is less than about 0.01 to 0.015 dl/g and the polyester pellets have a crystallinity greater than about 52%.

A process for producing a polyester having 2,5-furandicarboxylate units includes: a) providing or producing a starting composition including 2,5-furandicarboxylic acid, an aliphatic diol and a suppressant for suppressing ether formation between the aliphatic diol molecules, b) subjecting the starting composition to esterification conditions to produce an ester composition, and c) contacting the ester composition with a germanium containing catalyst at polycondensation conditions to produce a polyester including 2,5-furandicarboxylate units, where the suppressant includes amines and lithium hydroxide.

A process for producing a polyester having 2,5-furandicarboxylate units includes: a) providing or producing a starting composition including 2,5-furandicarboxylic acid, an aliphatic diol and a suppressant for suppressing ether formation between the aliphatic diol molecules, b) subjecting the starting composition to esterification conditions to produce an ester composition, and c) contacting the ester composition with a germanium containing catalyst at polycondensation conditions to produce a polyester including 2,5-furandicarboxylate units, where the suppressant includes amines and lithium hydroxide.

The present invention relates to a polyester container. The polyester container is formed from a polyester resin containing a particular content of diol moieties derived from isosorbide and diethylene glycol, and thus can show high transparency in spite of a great wall thickness thereof.

Disclosed is a preparation method for polylactic acid grafted chitosan nanowhiskers, and belongs to the technical field of materials. The preparation method of the disclosure is that after lactide, a catalyst and chitosan are uniformly mixed, polymerization grafting is performed to prepare PLA-g-CS, and then the PLA-g-CS is dispersed into an alkali liquor to obtain nanowhiskers by a repeated freezing/unfreezing method, with no solvent used in a polymerization grafting process. The method has advantages that the nanowhiskers can be prepared from the PLA-g-CS without a good solvent, and the whole reaction is efficient, clean, and environmentally friendly.

Processes and apparatuses for producing polymer particles with a solid state polycondensation reactor and an underwater pelletization unit. The apparatuses use a pre-conditioning zone to adjust a temperature, crystallization in addition to dust, acetaldehyde and water content of the particles from a crystallization bin. Various inert gas streams can be provided from a purification unit to remove dust, acetaldehyde, water and adjust temperature and crystallinity of the particles, as also move the particles. The precondition zones have stages that allow for the particles to accurately achieve the desired SSP reactor inlet conditions.

Generally spherical resin particles formed of a thermoplastic resin, having a sphericity of 0.90 to 1.00, a light scattering index of 0.5 to 1.0 and a linseed oil absorption of 30 to 150 mL/100 g.

Generally spherical resin particles formed of a thermoplastic resin, having a sphericity of 0.90 to 1.00, a light scattering index of 0.5 to 1.0 and a linseed oil absorption of 30 to 150 mL/100 g.

The present invention provides an efficient and cost-effective process to recover highly purified PHA homopolymers and copolymers, producing novel sequestered amorphous polyhydroxyalkanoate polymer (SAPP) materials derived from cellular biomass that are crystal competent. Such resulting materials (e.g., melt-derived solids and crystalline agglomerates), as well as methods of production of the sequestered amorphous polyhydroxyalkanoate polymer (SAPP) materials and subsequent processing, demonstrate cost-effective production of PHA polymer at commercial scale, which is heretofore not been achievable. Moreover, the methods and materials produced make feasible the long-awaited achievement in the industry for competitive commercialization of PHA homopolymers and copolymers from cellular biomass.

The present invention relates to a device to increase intrinsic viscosity of recycling polyester waste, first, shredding the recycled polyester waste, pouring the shredded polyester waste into a melting unit for smelting for achieving melting status, after filtration, pouring the semi-finished pellet into a reactor tank, the molecular chain of the melting polyester will depolymerize to a shorter molecular chain and further repolymerize to a molecular chain fitting the requirement, and using a vacuum unit to remove the organic impurity, moisture and dirt for increasing the intrinsic viscosity of the semi-finished pellet to make intrinsic viscosity be higher than 0.65 dl/g; by processing with the reactor tank, the present invention increases intrinsic viscosity of recycling polyester waste by changing the I.V. of the RPET and the structure of the molecular chain, enhancing the quality of the RPET for increasing applicability and economic benefits of RPET.