| 摘要 |
PURPOSE:To prepare the subject compsn. which is excellent in whiteness, light and washing resistance, and easily moldable without detriment to the mechanical and thermal properties inherent in a polyester by compounding it with a specific polyphosphonate. CONSTITUTION:The objective compsn. is prepd. by compounding a polyester with a polyphosphonate in an amt. of phosphorus of 0.3-3.0wt.% based on the polyester. The polyphosphonate is prepd. by reacting at least one bishydroxy compd. of formula I [wherein A is a divalent arom. group (contg. no halogen); R1 is 2-4C alkylene; and (m) is 1-2] with at least one p-monosubstd. phosphonyl dichloride of formula II (wherein R is 1-9C alkyl, aryl, or aralkyl). An amt. of the polyphosphonate lower than that corresponding to 0.3wt.% phosphorus gives an insufficient flame retardance to the compsn.; an amt. higher than that corresponding to 3wt.% phosphorus greately degrades physical properties of the polyester. |
