Storage method for polybutylene terephthalate pellets and packaging material for polybutylene terephthalate pellets

Abstract

To provide a storage method of a polybutylene terephthalate pellet preventing the polybutylene terephthalate pellet from becoming yellow in storing the pellet, and a packaging material.SOLUTION: A storage method of a polybutylene terephthalate pellet for packaging the polybutylene terephthalate pellet into a packaging material consisting of an oriented polyolefin woven fabric or a laminated sheet including the oriented polyolefin woven fabric and storing the pellet, and a packaging material are provided. Ultraviolet permeability of a wave length 250 nm of the packaging material is equal to or less than 10%, the packaging material comprises a pigment equal to or greater than 1 wt ppm and equal to or less than 5000 wt ppm and a specific surface area / an apparent area ratio of the packaging material is equal to or greater than 10. The pigment in the packaging material is preferably copper phthalocyanine.SELECTED DRAWING: None

Claims

1. A method for storing polybutylene terephthalate pellets, comprising packaging the pellets in a packaging material consisting of stretched polyolefin fabric or a laminated sheet containing stretched polyolefin fabric, The ultraviolet transmittance of the packaging material at a wavelength of 250 nm is 10% or less. The packaging material contains a pigment in an amount of 1 ppm by weight or more and 5000 ppm by weight or less. A method for storing polybutylene terephthalate pellets, wherein the specific surface area / apparent area ratio of the packaging material is 10 or more. Here, the specific surface area is the value obtained by the Brunauer-Emmett-Teller multipoint method (unit: m). ２ The specific surface area is calculated as ( / g), and the apparent area is twice the area per unit weight of the packaging material used when calculating the specific surface area (unit: m²). ２ It is / g).

2. The method for storing polybutylene terephthalate pellets according to claim 1, wherein the pigment is copper phthalocyanine.

3. A packaging material for polybutylene terephthalate pellets, comprising stretched polyolefin woven fabric or a laminated sheet containing stretched polyolefin woven fabric, The ultraviolet transmittance of the packaging material at a wavelength of 250 nm is 10% or less. The packaging material contains a pigment in an amount of 1 ppm by weight or more and 5000 ppm by weight or less. A packaging material for polybutylene terephthalate pellets, wherein the specific surface area / apparent area ratio of the packaging material is 10 or more. Here, the specific surface area is the value obtained by the Brunauer-Emmett-Teller multipoint method (unit: m). ２ The specific surface area is calculated as ( / g), and the apparent area is twice the area per unit weight of the packaging material used when calculating the specific surface area (unit: m²). ２ It is / g).

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