The invention relates to a process for preparing a polymer composition, comprising a blending step wherein a first polymer (component A1) and at least one further component are dosed into and mixed in a mixing apparatus, and wherein the first polymer A1 is a granulate polyamide material directly obtained by direct solid state polymerization of a diammonium dicarboxylate salt prepared by fluidized bed spray granulation. The invention also relates to a dry-blend obtainable by said process.

A method for producing polyamide particles may include: mixing a mixture comprising a polyamide, a carrier fluid that is immiscible with the polyamide, and nanoparticles at a temperature greater than a melting point or softening temperature of the polyamide and at a shear rate sufficiently high to disperse the polyamide in the carrier fluid; cooling the mixture to below the melting point or softening temperature of the polyamide to form solidified particles comprising polyamide particles having a circularity of 0.90 or greater and that comprise the polyamide and the nanoparticles associated with an outer surface of the polyamide particles; and separating the solidified particles from the carrier fluid.

A method for producing polyamide particles may include: mixing a mixture comprising a polyamide, a carrier fluid that is immiscible with the polyamide, and nanoparticles at a temperature greater than a melting point or softening temperature of the polyamide and at a shear rate sufficiently high to disperse the polyamide in the carrier fluid; cooling the mixture to below the melting point or softening temperature of the polyamide to form solidified particles comprising polyamide particles having a circularity of 0.90 or greater and that comprise the polyamide and the nanoparticles associated with an outer surface of the polyamide particles; and separating the solidified particles from the carrier fluid.

The present invention relates to a novel process for the production of a copolyamide comprising a polymerization product of hexamethylene diamine, adipic acid and terephthalic acid. A process for the production of a copolyamide comprising less than 50 mol % of units of hexamethylene terephthalamide may include (a) introducing an aqueous solvent and the monomers adipic acid, terephthalic acid and hexamethylene diamine, or salts thereof, into an evaporator to obtain a mixture; (b) concentrating the mixture obtained in step (a) in the evaporator by evaporation of at least part of the solvent, to obtain a concentrated mixture; (c) transferring the concentrated mixture obtained in step (b) into an autoclave; (d) polymerizing the monomers in the autoclave at a pressure of at least 1.2 MPa by increasing the temperature up to a temperature which is higher than the melting point of the copolyamide; (e) releasing the pressure in the autoclave by decompression; (f) allowing the polymerization to continue in the autoclave; and (g) granulating the copolyamide obtained in step (f); wherein the total duration of the steps (d)+(e)+(f), in particular of steps (c)+(d)+(e)+(f)+(g) is less than 9 h.

The present invention relates to a novel process for the production of a copolyamide comprising a polymerization product of hexamethylene diamine, adipic acid and terephthalic acid. A process for the production of a copolyamide comprising less than 50 mol % of units of hexamethylene terephthalamide may include (a) introducing an aqueous solvent and the monomers adipic acid, terephthalic acid and hexamethylene diamine, or salts thereof, into an evaporator to obtain a mixture; (b) concentrating the mixture obtained in step (a) in the evaporator by evaporation of at least part of the solvent, to obtain a concentrated mixture; (c) transferring the concentrated mixture obtained in step (b) into an autoclave; (d) polymerizing the monomers in the autoclave at a pressure of at least 1.2 MPa by increasing the temperature up to a temperature which is higher than the melting point of the copolyamide; (e) releasing the pressure in the autoclave by decompression; (f) allowing the polymerization to continue in the autoclave; and (g) granulating the copolyamide obtained in step (f); wherein the total duration of the steps (d)+(e)+(f), in particular of steps (c)+(d)+(e)+(f)+(g) is less than 9 h.

Method for obtaining biodegradable polymers that has a stage of esterification and/or transesterification and amidation reaction, a stage of prepolycondensation, a stage of polycondensation, a stage of extraction and a stage of drying, eliminating the use of chain extenders. The polymer can achieve all the range of viscosities desired and with an improved colour compared to the polymer from other methods, where chain extenders are used, provide a more efficient process, that is environmentally cleaner and safer for the operatives.

Method for obtaining biodegradable polymers that has a stage of esterification and/or transesterification and amidation reaction, a stage of prepolycondensation, a stage of polycondensation, a stage of extraction and a stage of drying, eliminating the use of chain extenders. The polymer can achieve all the range of viscosities desired and with an improved colour compared to the polymer from other methods, where chain extenders are used, provide a more efficient process, that is environmentally cleaner and safer for the operatives.

A tumbler crystallizer for crystallizing pelleted, tacky, polymeric materials includes a housing for rotatably supporting a removable paneled drum on rollers. The removable panels may be made of a transparent, heat-insulating material. The drum receives a flow of hot pellets through an inlet chute, and a tumbling action of the drum and internal agitators keeps the pellets in motion relative to each other to prevent agglomeration until they reach a desired level of crystallinity and are no longer tacky. Baffle plates are provided at intervals along the length of the drum to slow the flow of pellets therethrough to increase residence time. Damper plates are provided near the exit end of the drum to aid in building a bed of pellets within the drum, and also to control residence time of the pellets within the drum.

There is described a method for producing polymeric 3-hydroxypropionamide (3HP amide), the method comprising: culturing an Acetobacter lovaniensis-bacterium in a growth medium containing phosphate and ammonium, wherein culturing of the bacterium produces polymeric 3HP amide. The polymeric 3HP amide may then be hydrolysed to 3HP amide or converted to other compounds of interest.

There is described a method for producing polymeric 3-hydroxypropionamide (3HP amide), the method comprising: culturing an Acetobacter lovaniensis-bacterium in a growth medium containing phosphate and ammonium, wherein culturing of the bacterium produces polymeric 3HP amide. The polymeric 3HP amide may then be hydrolysed to 3HP amide or converted to other compounds of interest.