Kuraray Co., Ltd.

Nobuhiro Oya

Masahiro Kato

Hideaki Suzuki

Yasushi Senda

Shimon Kanai

Takaharu Shigematsu

Hideaki Takeda

Yoshihiro Aoki

The present invention relates to a modified hydrogenated product of a block copolymer having a polymer block (A) containing a structural unit derived from an aromatic vinyl compound, and a polymer block (B) containing a structural unit derived from a conjugated diene compound, a method of producing the modified hydrogenated product, and a resin composition containing the modified hydrogenated product. The modified hydrogenated product has one or more functional groups selected from an alkoxysilyl group, a carboxy group, an amino group, a hydroxy group, an epoxy group, and an acid anhydride-derived group, and satisfies the following conditions. Condition (1): after stay at 330&#xb0; C. for 30 min under nitrogen atmosphere, a weight change rate is &#x2212;5.5% or more. Condition (2): the peak top intensity of tan &#x3b4; measured in accordance with JIS K7244-10 (2005), under conditions including a strain amount of 0.1%, a frequency of 1 Hz, a measurement temperature of &#x2212;70 to 120&#xb0; C., and a temperature rise rate of 3&#xb0; C./min, is 1.0 or more.

Modified hydrogenated product, method for producing same, resin composition, and various uses thereof

There is provided a polyamide composition for an LED reflection plate, including a polyamide (A), a titanium oxide (B), a magnesium oxide (C), a phenolic antioxidant (D), and a phosphorus-containing antioxidant (E), wherein the polyamide (A) is a polyamide having a dicarboxylic acid unit comprising 50% by mol or more of terephthalic acid unit and a diamine unit and having a melting point of 280&#xb0; C. or higher; the phenolic antioxidant (D) does not have 4 or more phenol structures in its molecule; wherein the content of the titanium oxide (B) is 10 to 100 parts by mass, the content of the magnesium oxide (C) is 0.50 to 15.0 parts by mass, and the content of the phenolic antioxidant (D) is 0.10 to 0.80 part by mass, with respect to 100 parts by mass of the polyamide (A); and the content of the phosphorus-containing antioxidant (E) satisfies the following expression (I):0.25&#x2264;mass ratio [()component/()component]&#x2264;3.0&#x2003;&#x2003;(I).There are also provided a reflection plate obtained by molding the composition, and a light-emitting device having the reflection plate.

Polyamide composition for LED reflection plate, LED reflection plate, and light-emitting device including reflection plate

The present invention is a polyamide resin composition containing a polyamide resin (A) that contains from 95 to 99.95% by mass of a polyamide (a-1) having a number-average molecular weight of 2000 or more and from 0.05 to 5% by mass of a polyamide oligomer (a-2) having a number-average molecular weight of from 500 to less than 2000, in which at least 25 mol % of all the monomer units constituting the polyamide (a-1) and the polyamide oligomer (a-2) are structural units derived from a specific alicyclic monomer and the content ratio of the trans isomer structural units derived from the alicyclic monomer is from 50 to 85 mol %, and containing an inorganic filler (B). The polyamide resin composition is excellent in heat resistance, low water absorption, high-temperature rigidity and flowability, and exhibits the effects of securing sufficient crystallization even when molded in a mold at 80&#xb0; C. and causing minimal mold deposit during production.

Polyamide resin composition

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Tsukuba, Japan

Nobuhiro Oya