Techniques regarding catalyzing one or more ring-opening polymerizations within one or more flow reactors using one or more organometallic bases are provided. For example, one or more embodiments described herein can comprise a method, which can include forming a polymer, via a ring-opening polymerization within a flow reactor, from a cyclic monomer in the presence of an organometallic base and a primary alcohol initiator.

A method and a facility produce polylactide (PLA) by polymerization, in which a lactide mixture is mixed with at least one catalyst, is introduced into a modular planetary roller extruder and the finished PLA is then removed. The lactide mixture continuously passes through segments of the extruder. The course of the reaction is measured and controlled in the segments in a targeted manner such that the temperature can be set by heating and/or cooling. The pressure can be variably set depending on pressure values to be checked by a controllable gas extraction and/or a controllable extruder speed and/or static variability of the planetary rollers and/or a variable metering speed of the lactide mixture and/or a variable mixing ratio of the lactide mixture. Flammable gas is removed in an explosion-protected zone in a partial region of the extruder. Additives are introduced into the extruder during the rolling process.

A method for manufacturing polyester polymer containing waste polyester in a continuous polymerization unit that includes: a) providing an intermediate prepolymer stream from the continuous polymerization unit and diverting a portion of the intermediate polymer stream to a centrifugal mixer; b) adding waste polyester to said centrifugal mixer to obtain a homogenous melt stream, and c) combining the homogenous melt stream with the remaining portion of the intermediate polymer stream forming an outlet stream, wherein the method is characterized in that the waste polyester in step b) is not heated or melted.

Disclosed is a method for preparing a fully-degradable non-woven fabric by spun-bonding, including: (S1) preparation of a poly(caprolactone-co-lactide acid) (P(CL-co-LA)); (S2) preparation of a copolymerized-modified poly(lactide acid) (PLA); and (S3) preparation of a full-degradable non-woven fabric using a spun-bond method. In this disclosure, the PLA is modified in gradient several times to prepare the full-degradable non-woven fabric in combination with an optimized spun-bonding method.

A dynamic mixer to mix at least one curing agent and at least one resin system in the proportion of at least 2.5:100 to obtain a homogenous curative composition, wherein said mixer comprises a stirring chamber (5) provided with a motorised stirrer (4) suspended from the top of the chamber (5) and a siphon (6) at the bottom; at least one inlet hose (h1) connected to the stirring chamber at one end and pumping means (p1) at other end; the pumping means (p1) pump at least one curing system to the stirring chamber through the at least one inlet hose (h1); at least one inlet hose (h2) connected to the stirring chamber at one end and pumping means (p2) at other end; the pumping means (p2) pump at least one resin system to the stirring chamber through the at least one inlet hose (h2); and frame to setup the dynamic mixer. The proportion of diameter (A) of the stirring chamber (5); length (B) of the stirring chamber (5) from a top closure to a bottom opening of the chamber (5); and the length (C) from the bottom opening of the chamber (5) and a top of the siphon (6) may vary only in the ratio of 1:(2.6-3.0):(1.1-1.3) i.e. [(A):(B):(C)] to obtain the homogenous curative composition comprising 2.5 phr curing system per resin system.

The present invention relates to the field of high polymer material manufacturing, and discloses an air-isolated continuous feeding system for synthesizing polylactic acid from lactide and a feeding method thereof. The continuous feeding system comprises a raw material bag/box and a raw material collector for collecting and outputting lactide, the raw material bag/box is connected with a shielding gas input pipeline, a discharge pipe is movably inserted into the raw material bag/box, a cyclone separator is connected downstream of the discharge pipe, and a solid substance outlet of the cyclone separator is connected with the raw material collector. According to the invention, deterioration of the lactide raw material incurred by moisture absorption and oxidation is avoided, and the reaction conversion ratio and final product purity are improved. The continuous feeding system is easy to operate, can save manpower and material resources, and is applicable to industrial application.

The invention relates to a process for the preparation of a composition comprising polylactide and lactide by ring-opening polymerization of lactide, said process comprising the steps of: (a) providing lactide and polymerization catalyst to a reactor, (b) melt polymerizing said lactide to a degree of polymerization of at most 96.0%, to form a composition comprising polylactide and lactide, and (c) removing said composition from the reactor, wherein the whole process is performed at pressures of at least 1 bar, and wherein the composition removed from the reactor is never subjected to a pressure below 1 bar and wherein the composition is not subjected to one of more devolatilization steps.

Polymers and copolymers, and systems and methods for processing the same. Advantageously, the polymers and copolymers of the present invention have undergone processing in a falling strand devolatilizer and rotary disk finisher such that a low-cost, low-energy, and high-production-rate product is produced.

A method for processing a mixture of recycled polyester material and a polyester prepolymer from a polyester manufacturing process, wherein a recycled polyester material is mixed with a polyester prepolymer, from a polyester manufacturing process, and treated in a bulk thermal treatment reactor (7) with a process gas which flows in a counter-current or a cross-current flow direction to the flow direction of the mixture. In this process, the process gas, before entering a catalyst vessel (14), is passed through a protective bed (11) containing a solid adsorbent material that removes high-boiling organic substances or organic substances, with a high combustion temperature, from the process gas stream.

Provided herein are methods and systems for producing a thermally stable polylactone polymer comprising chain terminating the polymer with an end-capping agent to prevent scission of the polymer. Also provided is a thermally stable polylactone polymer wherein the polymer has a first end and a second end, wherein at least one of said first and second ends terminate in an end-capping agent.