JP-7854608-B2 - Polyester resin compositions, fibers, and films

Inventors

• 廣部 育弥
• 福林 夢人
• 天満 悠太

Assignees

• ＮＢセーレン株式会社

Dates

Publication Date

20260507

Application Date

20210727

Priority Date

20210621

Claims (3)

1. A fiber containing a polyester resin composition comprising a polyester resin consisting of an aromatic dicarboxylic acid component having a terephthalic acid content of 70 mol% or more and a glycol component containing ethylene glycol, and silica particles , wherein the sulfur component content is 5 to 150 ppm . However, the silica particles are contained in the polyester resin composition at a concentration of 0.1 to 20% by mass, and the particle size distribution of the silica particles, as measured by laser diffraction, has an average particle size of 3.0 μm or less and a maximum particle size of 10.0 μm or less.
2. The fiber according to claim 1, wherein the specific surface area of the silica particles contained in the polyester resin composition is 50.0 m² /g or less.
3. The fiber according to claim 1 or 2 , wherein the silica particles contained in the polyester resin composition are spherical silica particles.

Description

This invention relates to a polyester resin composition suitable for use in fiber and film applications. Polyester resins, such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN), possess excellent mechanical and chemical properties and are used in a wide range of fields (for example, fibers for clothing and industrial materials, films or sheets for packaging and magnetic tapes, hollow molded bottles, casings for electrical and electronic components, and other engineering plastic molded products). In film applications, it is known that incorporating fine particles into polyester resin adds a moderate level of surface irregularity, thereby imparting properties such as blocking resistance and mold release. Furthermore, in textile applications, it is known that incorporating inorganic oxide fine particles such as silica and titanium dioxide into polyester resin imparts properties such as coolness, opacity, and heat retention to woven or knitted fabrics. For example, Patent Document 1 discloses a polyester resin composition containing silica particles for obtaining polyester fibers with excellent heat retention properties. Japanese Patent Publication No. 2012-57129 The polyester resin composition of the present invention will be described in detail below. The polyester resin composition of the present invention comprises a polyester resin and silica particles. The polyester resin consists of a dicarboxylic acid component mainly composed of terephthalic acid and a glycol component containing ethylene glycol. Other dicarboxylic acid components or other glycol components may be copolymerized to the extent that they do not impair the properties of the resin composition. The proportion of terephthalic acid in the acid component is preferably 70 mol% or more, more preferably 80 mol% or more, even more preferably 90 mol% or more, and particularly preferably 100 mol%. If the proportion of terephthalic acid is less than 70 mol%, the crystallinity of the resin composition decreases, the melting point becomes lower, and the operability during melt spinning and film formation (hereinafter simply referred to as operability) may decrease. Examples of acid components other than terephthalic acid in polyester resins include isophthalic acid, phthalic acid, phthalic anhydride, naphthalenedicarboxylic acid, adipic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, dodecanedioic acid, dimer acids, as well as trimellitic anhydride, trimellitic acid, pyromellitic acid, 1,4-cyclohexanedicarboxylic acid, sebacic acid, dimer acids, etc. Two or more of these may be used in combination, and ester-forming derivatives of these acids may also be used. Furthermore, the polyester resin may contain an aliphatic lactone as an acid component. Aliphatic lactones include lactones having 4 to 11 carbon atoms and homopolymers or copolymers of two or more thereof, with ε-caprolactone and δ-barrelactone being particularly preferred aliphatic lactones. The polyester resin contained in the polyester resin composition of the present invention contains ethylene glycol as a glycol component. The proportion of ethylene glycol in the glycol component is preferably 20 mol% or more, more preferably 40 mol% or more, even more preferably 75 mol% or more, and particularly preferably 80 mol% or more, as this provides superior crystallinity and heat resistance. Specific examples of glycol components other than ethylene glycol include diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propylene glycol, neopentyl glycol, 1,6-hexanediol, 1,4-butanediol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, dimergol, ethylene oxide adducts of bisphenol S, ethylene oxide adducts of bisphenol A, and the like. When a polyester resin contains diethylene glycol as a glycol component, its content is preferably 2 mol% or more, and more preferably 5 mol% to 15 mol% of the total glycol components. A diethylene glycol content within this range results in superior operability. When the polyester resin contains triethylene glycol as a glycol component, its content is preferably 0.4 to 6.0 mol% of the total glycol component, as this provides superior operability. When polyester resin contains tetraethylene glycol as a glycol component, its content is preferably 2 mol% or less, as this further enhances the properties of the resulting fibers, films, etc. The polyester resin composition of the present invention has a silica particle content of 0.1 to 20% by mass, preferably 0.5 to 15% by mass. If the silica particle content is less than 0.1% by mass, the matte finish and opacity of molded articles, fibers, films, etc., will be insufficient. On the other hand, if the silica particle content exceeds 20% by mass, aggregation of silica particles occurs, resulting in the generation of coarse silica particles with a particle size of 5 μm or more. In fibers, this can cause deterioration of operability due to thread breakage a