| abstract |
Mixts. of netural esters of phosphorous acid and oxetan cpds. used in mixing ratio such that 2-10(3-6) oxetan gps. are present for each P-atom in mixt. are used for colour-stabilising and brightening plastics. Used for stabilising rubber, e.g. butadiene- and isoprene polymers, polyethylene, polypropylene, polyacrylonitrile, ABS-terpolymers, polyesters, PVC, PTFE, polyphenylene oxide, polyamide, cellite and esp. high mol.wt. thermoplastic polycarbonates, e.g. for articles exposed to prolonged high thermal stress, e.g. lamp-shades, and esp. articles requiring high transparency, e.g. polycarbonate sheets for glazing. Mixt is at least as active as an oxetan gp.-contg. phospite. |