| 摘要 |
PURPOSE:To facilitate push-bending and incorporation through heating along a die by containing each specified quantity of a styrene monomer and a styrene trimer and bringing the relationship of a breaking elengation percentage in the specified axial direction of the triaxial directions crossing at righa angles within a specified range. CONSTITUTION:The rectangular parallelepiped foamed body in independent bubble structure, a bubble wall thereof has creases, is constituted by forming the bubble film by the styrene group resin of not more than 0.3wt% styrene monomer content and 0.5-1.5wt% trimer content. In this case, when bubbles in the foamed body are directly viewed from three surfaces in the triaxial directions mutually crossing at right angles, the foamed body, which shows directional property of which there are axial directions Y, Z through which the creases of the bubble film can be viewed to a great extent and the axial direction X through which they can be viewed at least, a means bubbles diameter mm. thereof in the X, Y, Z axes directions satisfies the relationship of a formulaIwith Dkg/m<3> foamed body density and steam permeability Fy(g/m<2>.hr) thereof in the Y direction satisfies the value of 1.5 or lower, is formed. |
