摘要:
A method for producing an undrawn polyglycolic acid-based resin yarn, including: a discharge step of discharging a molten polyglycolic acid-based resin through a spinneret, to thereby form a fibrous polyglycolic acid-based resin; a keeping step of keeping the fibrous polyglycolic acid-based resin for 0.0012 seconds or more after the discharge in an atmosphere having a temperature of not lower than 110.5° C. but not higher than a melting point of the polyglycolic acid-based resin; and a cooling step of cooling the fibrous polyglycolic acid-based resin obtained in the keeping step, to thereby obtain an undrawn polyglycolic acid-based resin yarn.
摘要:
A method for producing an undrawn polyglycolic acid-based resin yarn, including: a discharge step of discharging a molten polyglycolic acid-based resin through a spinneret, to thereby form a fibrous polyglycolic acid-based resin; a keeping step of keeping the fibrous polyglycolic acid-based resin for 0.0012 seconds or more after the discharge in an atmosphere having a temperature of not lower than 110.5° C. but not higher than a melting point of the polyglycolic acid-based resin; and a cooling step of cooling the fibrous polyglycolic acid-based resin obtained in the keeping step, to thereby obtain an undrawn polyglycolic acid-based resin yarn.
摘要:
Biodegradable aliphatic polyester particles have: (A) an average particle diameter of 10 to 500 μm, and (B) a quantity of heat of low-temperature crystallization calculated as an exotherm attending on crystallization, detected in the course of heating by DSC, of at least 1 J/g, and preferably: (C) a quantity of heat of crystal melting calculated as an endotherm attending on melting of a crystal, detected in the course of the heating, of less than 100 J/g, and (D) a difference between the quantity of heat of crystal melting and the quantity of heat of low-temperature crystallization of less than 90 J/g. A process for producing the particles, comprises grinding a particular biodegradable aliphatic polyester having a weight average molecular weight of at least 50,000 at not lower than 0° C. and lower than the glass transition temperature of the polyester while applying high shearing force.
摘要:
The invention provides biodegradable aliphatic polyester particles having the following physical properties: (A) the average particle diameter thereof is 5 to 500 μm; and (B) the fracture stress of a columnar tablet obtained by molding the particles in a cylindrical mold by applying a load of 4 kgf/cm2 for 1 hour at a temperature of 40° C. is at most 500 gf/cm2, and preferably also having the following property: (C) the fracture stress of a columnar tablet obtained by molding the particles in a cylindrical mold by applying a load of 4 kgf/cm2 for 1 hour at a temperature of [the glass transition temperature (Tg) of a biodegradable aliphatic polyester +10° C.] is at most 2,000 gf/cm2, a process for producing the biodegradable aliphatic polyester particles, which comprises treating a particulate biodegradable aliphatic polyester obtained by grinding at a temperature lower than the Tg at a temperature not lower than [the crystallization temperature (Tc1) upon heating of the biodegradable aliphatic polyester−40° C], and the biodegradable aliphatic polyester particles obtained by the production process.
摘要翻译:本发明提供具有以下物理性质的生物可降解脂族聚酯颗粒:(A)其平均粒径为5至500μm; 和(B)通过在40℃的温度下施加4kgf / cm 2的负荷1小时将通过在圆筒形模具中成型颗粒而获得的柱状片的断裂应力为500gf / cm 2以下,优选为 还具有以下特性:(C)通过在[玻璃化转变温度(Tg)为[玻璃化转变温度(Tg)]的温度下,通过在4kgf / cm 2的负荷下进行1小时的模塑而将颗粒成形为圆柱形模具而获得的柱状片的断裂应力 生物降解性脂肪族聚酯+ 10℃]为2000gf / cm 2以下,生物降解性脂肪族聚酯粒子的制造方法,其特征在于,在不低于Tg的温度下,在不低于Tg的温度下,研磨得到的颗粒状生物降解性脂肪族聚酯 低于[生物降解性脂肪族聚酯-40℃加热时的结晶温度(Tc1)],以及通过该制造方法得到的生物降解性脂肪族聚酯粒子。
摘要:
Biodegradable aliphatic polyester particles have: (A) an average particle diameter of 10 to 500 μm, and (B) a quantity of heat of low-temperature crystallization calculated as an exotherm attending on crystallization, detected in the course of heating by DSC, of at least 1 J/g, and preferably: (C) a quantity of heat of crystal melting calculated as an endotherm attending on melting of a crystal, detected in the course of the heating, of less than 100 J/g, and (D) a difference between the quantity of heat of crystal melting and the quantity of heat of low-temperature crystallization of less than 90 J/g. A process for producing the particles comprises grinding a particular biodegradable aliphatic polyester having a weight average molecular weight of at least 50,000 at not lower than 0° C. and lower than the glass transition temperature of the polyester while applying high shearing force.
摘要:
A method for producing a polyglycolic acid fiber, including: obtaining undrawn yarns by melt spinning a polyglycolic acid resin; keeping the undrawn yarns under a temperature condition of 1 to 20° C.; obtaining drawn yarns by drawing the kept undrawn yarns; and, if necessary obtaining a staple fiber by cutting the drawn yarns.
摘要:
A method for producing a polyglycolic acid fiber, including: obtaining undrawn yarns by melt spinning a polyglycolic acid resin; keeping the undrawn yarns under a temperature condition of 1 to 20° C.; obtaining drawn yarns by drawing the kept undrawn yarns; and, if necessary obtaining a staple fiber by cutting the drawn yarns.
摘要:
A method for producing a polyglycolic acid-based fiber, includes a spinning process of obtaining undrawn yarns by melt spinning a polyglycolic acid-based resin composition, which comprises a polyglycolic acid resin and a polylactic acid resin having a weight average molecular weight of 10×104 to 30×104 in a mass ratio of the polyglycolic acid resin to the polylactic acid resin of 70/30 to 99/1. The method also includes a keeping process of keeping the undrawn yarns and a drawing process of obtaining drawn yarns by drawing the kept undrawn yarns.
摘要:
A dispersion liquid for supporting oil drilling, including: an aqueous medium and a particulate solid polyglycolic acid resin dispersed in the aqueous medium; wherein the particulate polyglycolic acid resin has a weight-average molecular weight of at least 70,000 and at most 500,000, and exhibits weight retentivities in water at 80° C. of at least 85% after 12 hours, at most 80% after 72 hours, and at most 45% after 168 hours. The particulate solid polyglycolic acid resin included in the above-mentioned dispersion liquid for supporting oil drilling, functions as a fluidity control material exhibiting ideal degradation characteristics in the drilling operation for expansion of oil production capacity, demanded for suppressing the liquid permeability in the early stage and recovery of the liquid permeability after completion of the operation of the formation around the oil well.
摘要:
A vapor deposition film has a vapor deposition layer composed of a metal or an inorganic oxide formed on at least one side of a resin layer (A) which is composed of a resin composition (1). The resin composition (1) is a polyglycol acid containing not less than 70% by mole of a specific structure (a structure represented by formula (1)) as a repeating unit. The surface on which the vapor deposition layer is deposited has a center line average roughness of 5-50 nm. The vapor deposition film has excellent gas barrier properties, excellent workability and decomposition resistance sufficient for practical use.