The present invention relates to an aliphatic-aromatic polyester having a whiteness index according to ASTM E 313-73 of at least 25, to a process for preparation thereof and to the use of the aliphatic-aromatic polyester for production of polyester fibers (PF). The present invention further relates to the polyester fibers (PF) comprising the aliphatic-aromatic polyester.

An object of the present invention is to provide a method for producing a polymeric molded product, which does not undergo a considerable molecular weight reduction during melt-molding, even in a polymer may easily lose its molecular weight when it is in a melted state. The present invention provides a method for producing a polymeric molded product, which comprises melt-molding a polymer comprising lamellar crystals that are different in lamella thickness, in a temperature range where some of the lamellar crystals undergo melting and flowing, and the other balance lamellar crystals remain unmelted.

A functionally gradient material for guided periodontal hard and soft tissue regeneration includes a 3D printed scaffold layer and an electrospun fibrous membrane layer. The content of hydroxyapatite in the 3D printed scaffold layer is higher than the content of hydroxyapatite in the electrospun fibrous membrane layer. The pore size of the 3D printed scaffold layer is larger than the pore size of the electrospun fibrous membrane layer. The pore size of the 3D printed scaffold layer is 100-1000 μm, and the fiber diameter of the electrospun fibrous membrane layer is 300-5000 nm. The electrospun fibrous membrane layer is in a random distribution or an oriented arrangement or has a mesh structure. The thickness of the electrospun fibrous membrane layer is 0.08-1 mm.

A functionally gradient material for guided periodontal hard and soft tissue regeneration includes a 3D printed scaffold layer and an electrospun fibrous membrane layer. The content of hydroxyapatite in the 3D printed scaffold layer is higher than the content of hydroxyapatite in the electrospun fibrous membrane layer. The pore size of the 3D printed scaffold layer is larger than the pore size of the electrospun fibrous membrane layer. The pore size of the 3D printed scaffold layer is 100-1000 μm, and the fiber diameter of the electrospun fibrous membrane layer is 300-5000 nm. The electrospun fibrous membrane layer is in a random distribution or an oriented arrangement or has a mesh structure. The thickness of the electrospun fibrous membrane layer is 0.08-1 mm.

An object of the present invention is to provide a method for producing a polymeric molded product, the method enabling expansion of a temperature range that can be used for partial melting. The present invention provides a method for producing a polymeric molded product, which comprises subjecting a crystalline polyhydroxyalkanoate to a heating treatment at a temperature equal to or higher than a glass transition temperature; and melt-molding a polyhydroxyalkanoate yielded by the heating treatment, which comprises lamellar crystals that are different in lamellar thickness, in a temperature range where some of the lamellar crystals undergo melting and flowing, and the other balance lamellar crystals remain unmelted.

A method for preparing a liquid crystal polymer film, comprising: (1) spinning a liquid crystal polymer into fibers, and maintaining the fibers for 0.1 hour to 36 hours at a temperature of 200° C. to 400° C. under a vacuum degree less than 500 Pa for later use; (2) weaving the fibers prepared in step (1) into cloth for later use; and (3) pressing the cloth prepared in step (2) into a film at a temperature of 200° C. to 400° C., and then stretching the film to obtain the liquid crystal polymer film. The liquid crystal polymer film prepared by the preparation method is good in mechanical property, and has a tensile strength that can exceed 170 MPa. The prepared liquid crystal polymer film is applied to a FPC, which makes the FPC have a dielectric constant less than 3, and a small dielectric loss tangent angle.

The present invention relates to a method for manufacturing a wholly aromatic liquid-crystalline polyester fiber with enhanced spinnability, and more specifically, to a method for manufacturing a wholly aromatic liquid-crystalline polyester fiber including: pelletizing a resin manufactured by adding 1.08 equivalents to 1.12 equivalents of acetic anhydride to raw material monomers including hydroxy benzoic acid, hydroxy naphthoic acid, biphenol, terephthalic acid, and isophthalic acid, followed by solid-phase polycondensation, and melt-spinning under oil conditions in which winding-up improving oil is diluted to 0.5% to 2% and silicone spinning oil for high temperature is diluted to 0.5% to 2%, respectively, with water as a solvent.

The present invention relates to a method for manufacturing a wholly aromatic liquid-crystalline polyester fiber with enhanced spinnability, and more specifically, to a method for manufacturing a wholly aromatic liquid-crystalline polyester fiber including: pelletizing a resin manufactured by adding 1.08 equivalents to 1.12 equivalents of acetic anhydride to raw material monomers including hydroxy benzoic acid, hydroxy naphthoic acid, biphenol, terephthalic acid, and isophthalic acid, followed by solid-phase polycondensation, and melt-spinning under oil conditions in which winding-up improving oil is diluted to 0.5% to 2% and silicone spinning oil for high temperature is diluted to 0.5% to 2%, respectively, with water as a solvent.

The invention relates to a process for manufacturing a multilayer knitted textile by heating a multi-layer knitted textile in the presence of one or more dye compounds, wherein the multilayer knitted textile comprises a fabric outer layer and a fabric inner layer, wherein the fabric outer layer is knit from a first yarn containing a combination of modacrylic fibers and cotton fibers, wherein the fabric inner layer is knit from a second yarn made from 50-90% HBA/HNA filaments, wherein the heating shrinks the outer layer from about 5 to 25% in length, width, or both.

Provided is a liquid crystal polyester fiber in which gas generation from the liquid crystal polyester fiber can be suppressed when being heated. The liquid crystal polyester fiber has a total amount of carboxy end groups (total CEG amount) of 5.0 mEq/kg or less and a tenacity of 18 cN/dtex or higher. For example, the liquid crystal polyester fiber may have an initial elastic modulus variation of 3.0% or less. The liquid crystal polyester fiber may contain carboxy end groups as carboxyphenyl terminus at a CEG amount of 4.0 mEq/kg or less.