| abstract |
PURPOSE: To produce the stabilizing composition for a thermoplastic polymer or the like that contains certain sterically hindered anti-oxidation phenol, triarylphosphite and dialkylthiodipropionate with excellent color properties and keeping optically the melt index and the thermal stability-index. n CONSTITUTION: The object stabilizing composition is produced by blending (A) a sterically hindrance prevention phenol such as a pentaerythritol-tetra(3-(3,5- tertiary butyl-4-hydroxyphenyl) propionate), (B) a triarylphosphite denoted in formula (R 1 is tertiary butyl,1,1-dimethyl propyle; R 2 is methyl or tertiary butyl etc.), and (C) a dialkylthiodipropionate containing 10-20C alkyl at a weight ratio (B+C)/A of 50/59-80/20 and a weight ratio B/C of 99/1-90/10. n COPYRIGHT: (C)1989,JPO |