| 摘要 |
PURPOSE:The titled composition, obtained by adding coarse and fine two inorganic particles having average particle diameter, particle diameter distribution of fine particles and ratio of abundance of both selected within specific ranges to polyethylene terephthalate (PET) based polyester, having improved slipperiness and a favorable surface form. CONSTITUTION:An easily slippery polyester composition obtained by adding (A) 0.01-0.5wt% particles, having 1-3mu average particle diameter (muA) and containing substantially no coarse particle having >=10mu particle diameter and (B) 0.3- 1wt% particles, having 30-100mmu average particle diameter (muB), and containing substantially no particle having >=300mmu particle diameter at <=5 ratio (muB/ deltaB) between (muB) and the standard deviation (deltaB) of the particle diameter distribution at a ratio between both (A) and (B) as follows: 1/25<=A/B<=1/2 as a 1-20wt% dispersion in ethylene glycol after completion of the esterification step at a point of 90% esterification reaction ratio or above in the case of the direct esterification as inorganic particles, preferably silicon dioxide inert to polyethylene terephthalate (PET) polyester thereto.
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