| abstract |
PHOSPHITES ARE PREPARED HAVING ONE OF THE FORMULAE: (HO-R-O-(3,9-2,4,8,10-TETRAOXA-3,9- DIPHOSPHASPIRO(5.5)UNDECYLENE)-O-R-O)3-P, C(-CH2-O-P(-O-R-OH)2)4 AND C(-CH2-(3,9-2,4,8,10-TETRAOXA-3,9- DIPHOSPHASPIRO(5.5)UNDECYLENE)-O-R-OH)4 WHERE R IS THE RESIDUE OF A HYDROGENATED DIHYDRIC PHENOL, PREFERABLY HYDROGENATED BISPHENOL A. THE PENTACRYTHRITOL CAN BE REPLACED BY DIPENTAERYTHRITOL OR TRIPENTAERYTHRITOL. THE COMPOUNDS ARE USEFUL AS STABILIZERS, E.G. FOR RIGID POLYVINYL CHORIDE. |