JP2013181152A5

JP2013181152A5 -

Info

Publication number: JP2013181152A5
Application number: JP2012047551A
Authority: JP
Filing date: 2012-03-05
Publication date: 2014-09-04

Description

本発明は、結晶性芳香族ポリエステルからなる高融点結晶性重合体セグメント（ａ１）と、脂肪族ポリエーテル単位および／または脂肪族ポリエステル単位からなる低融点重合体セグメント（ａ２）とを構成成分とし、前記低融点重合体セグメント（ａ２）の占める割合が２５〜７０重量％であるポリエステルブロック共重合体（Ａ）５０〜８０重量％と、硬質樹脂（Ｂ）２０〜５０重量％とからなる樹脂組成物であって、硬質樹脂（Ｂ）がポリブチレンテレフタレートおよび／またはポリブチレンナフタレートであり、さらに下記条件（１）〜（４）を
（１）ＪＩＳＫ７１９９法に従って測定した測定温度２６０℃、せん断速度２００００ｓｅｃ^−１で測定される粘度（Ｐａ・ｓ）が、４０以下
（２）等温結晶化時間が１．０ｍｉｎ．以下
（３）ＡＳＴＭＤ３７６３法に従って測定した高速面衝撃試験で、試験速度１０ｍ／ｓ、ストライカー径１／２インチ、試験温度−３０℃の条件下において延性破壊を示し、破壊エネルギーが２０Ｊ以上
（４）ＡＳＴＭＤ２５６に従って測定した２３℃における曲げ弾性率が４００ＭＰａ以上
全て満たすポリエステルブロック共重合体樹脂組成物である。 The present invention comprises as constituent components a high-melting-point crystalline polymer segment (a1) composed of a crystalline aromatic polyester and a low-melting-point polymer segment (a2) composed of an aliphatic polyether unit and / or an aliphatic polyester unit. A resin comprising 50 to 80% by weight of a polyester block copolymer (A) in which the proportion of the low melting point polymer segment (a2) is 25 to 70% by weight and 20 to 50% by weight of a hard resin (B) The composition, wherein the hard resin (B) is polybutylene terephthalate and / or polybutylene naphthalate, and the following conditions (1) to (4) are measured according to (1) JIS K7199 method at a measurement temperature of 260 ° C., The viscosity (Pa · s) measured at a shear rate of 20000 sec ⁻¹ is 40 or less. (2) Isothermal crystallization time is 1.0 min. (3) In a high-speed surface impact test measured according to the ASTM D3763 method, it shows ductile fracture under conditions of a test speed of 10 m / s, a striker diameter of 1/2 inch, a test temperature of −30 ° C., and a fracture energy of 20 J or more (4 ) A polyester block copolymer resin composition having a bending elastic modulus at 23 ° C. measured in accordance with ASTM D256 of 400 MPa or more.

本発明に用いる硬質樹脂（Ｂ）は、材料の剛性を向上させるためのものであり、相溶性の点から、ポリブチレンテレフタレートおよび／またはポリブチレンナフタレートが用いられる。 Hard resin (B) used in the present invention is intended to improve the rigidity of the material, the point or these compatible port polybutylene terephthalate and / or polybutylene naphthalate is used.

Claims

The low-melting-point crystalline polymer segment (a1) composed of crystalline aromatic polyester and the low-melting-point polymer segment (a2) composed of aliphatic polyether unit and / or aliphatic polyester unit, A resin composition comprising 50 to 80% by weight of a polyester block copolymer (A) having a polymer segment (a2) occupying 25 to 70% by weight and 20 to 50% by weight of a hard resin (B). And the hard resin (B) is polybutylene terephthalate and / or polybutylene naphthalate, and further satisfies all of the following conditions (1) to (4).
(1) Viscosity (Pa · s) measured at a measurement temperature of 260 ° C. and a shear rate of 20000 sec ⁻¹ measured according to JIS K7199 method is 40 or less. (2) Isothermal crystallization time is 1.0 min. (3) In a high-speed surface impact test measured according to the ASTM D3763 method, it shows ductile fracture under conditions of a test speed of 10 m / s, a striker diameter of 1/2 inch, a test temperature of −30 ° C., and a fracture energy of 20 J or more (4 ) Bending elastic modulus at 23 ° C. measured according to ASTM D256 is 400 MPa or more

The molded object formed by injection-molding the polyester block copolymer resin composition of Claim 1 .