| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition excellent in surface smoothness and easily being formed as a sheet by including a polystyrene-based resin, an organic phosphoric acid ester, a specific fatty acid ester and a zinc salt of a higher fatty acid. SOLUTION: This polystyrene-based resin composition is obtained by including (A) 100 pts.wt. polystyrene-based resin, (B) 0.2-5 pt.wt. organic phosphoric acid ester, (C) 0.2-5 pt.wt., preferably 0.5-2 pt.wt. fatty acid ester of a mono- or polyhydric alcohol ester and (D) 0.1-3 pt.wt., preferably 0.3-1 pt.wt. zinc salt of a higher fatty acid. As the component B, tridecylpolyoxyethylene phosphate, nonylphenylpolyoxyethylene phosphate, etc., are preferable. As the component C, a mixed ester of dipentaerythritol (1 mol) with adipic acid (0.5-1 mol) and stearic acid (2.5-5 mol), etc., are preferable. As the component D, zinc stearate, etc., are preferable. |
