JP2006274269A5

JP2006274269A5 -

Info

Publication number: JP2006274269A5
Application number: JP2006135693A
Authority: JP
Filing date: 2006-05-15
Publication date: 2009-10-08
Anticipated expiration: 2022-07-17

Description

（１）スチレン系グラフト共重合体中のゴム成分について、膨潤度（ＳＩ）は、７．５〜２０程度であり、グラフト率（ｇ）が１．８〜５であり、膨潤度（ＳＩ）とグラフト率（ｇ）との積（ＳＩ×ｇ）が２０〜８０（特に２０〜６０）であり、かつ平均粒子径が１〜５μｍであること
（２）スチレン系樹脂組成物中のゴム成分の含有量が０．７〜１２重量％（好ましくは３重量％を超え１０重量％以下、さらに好ましくは３．３〜５重量％）であること
（３）延伸方向に沿ってシート面に対して垂直方向に切断したシート断面において、（ｉ）ゴム成分の長軸がシート面に対して実質的に平行であり、ゴム成分の断面の長軸Ｌと短軸Ｓとの比で表されるゴム扁平度Ｆ（Ｆ＝Ｌ／Ｓ）が５〜２１．２であり、（ｉｉ）ゴム成分が層状の形態で分散しており、シートの平面から厚み方向に透視したとき、前記層状ゴム成分が少なくとも部分的に重複し、かつ（ｉｉｉ）断面の厚み方向に引いた直線を横切るゴム成分の数が１〜１３／１０μｍであること。 (1) The rubber component in the styrene-based graft copolymer has a degree of swelling (SI) of about 7.5 to 20, a graft ratio (g) of 1.8 to 5, and a degree of swelling (SI). And the graft ratio (g) (SI × g) is 20 to 80 (particularly 20 to 60) and the average particle size is 1 to 5 μm. (2) Rubber in the styrene-based resin composition The content of the component is 0.7 to 12% by weight (preferably more than 3% by weight and not more than 10% by weight, more preferably 3.3 to 5% by weight). (3) On the sheet surface along the stretching direction. In the sheet cross section cut perpendicularly to the sheet, (i) the major axis of the rubber component is substantially parallel to the sheet surface, and is represented by the ratio of the major axis L and minor axis S of the rubber component cross section. The rubber flatness F (F = L / S) is 5 to 21.2, and (ii) the rubber component is in a layered form When dispersed and seen through the sheet from the plane in the thickness direction, the layered rubber component overlaps at least partially and (iii) the number of rubber components crossing the straight line drawn in the thickness direction of the cross section is 1 to 13 / 10 μm.

Claims

The rubber component is composed of a styrene resin composition containing at least a styrene graft copolymer in which at least a styrene monomer is graft-polymerized, and is stretched at a stretch ratio of 1.2 to 5 times in the longitudinal and transverse directions. A biaxially stretched styrene resin sheet which is a styrene resin sheet having an axially stretched thickness of 0.05 to 0.5 mm, which satisfies the following requirements (1) to (3).
(1) The rubber component in the styrene-based graft copolymer has a degree of swelling (SI) of 7.5 to 20, a graft ratio (g) of 1.8 to 5, and the degree of swelling (SI) and graft. The product (SI × g) with the rate (g) is 20 to 80 and the average particle size is 1 to 5 μm. (2) The content of the rubber component in the styrene-based resin composition is 0.7. (3) In the sheet cross section cut in the direction perpendicular to the sheet surface along the stretching direction, (i) the major axis of the rubber component is substantially parallel to the sheet surface; The rubber flatness F (F = L / S) represented by the ratio of the major axis L to the minor axis S of the cross section of the rubber component is 5 to 21.2, and (ii) the rubber component is dispersed in a layered form And the layered rubber component overlaps at least partially when seen through from the plane of the sheet in the thickness direction. (Iii) The number of rubber components crossing the straight line drawn in the thickness direction of the cross section is 1 to 13/10 μm

A method for improving rigidity, impact resistance and oil resistance of a thin and light biaxially stretched styrene sheet-based resin sheet, wherein the biaxially stretched styrene resin sheet according to claim 1 is used, A method to improve impact resistance and oil resistance.