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    • 8. 发明专利
    • IMPROVED POLYESTER POLYMER
    • JP2000143955A
    • 2000-05-26
    • JP32155999
    • 1999-11-11
    • CLARIANT INT LTD
    • WEBSTER JOSEPH RENI
    • C08J3/22C08K5/07C08K5/132C08K5/3435C08L67/02
    • PROBLEM TO BE SOLVED: To obtain a polyester polymer improved in retention of physical properties with time after heat setting and improved in long-term retention of physical properties and color after exposures of UV irradiation by adding a specific compound as a homogeneous mixture to a polyester. SOLUTION: This polyester polymer is obtained by homogeneously mixing a polyester with an effective amount of a compound represented by formula I [n is 2-4; at least one R4 is a sterically hindered amine adjacent to carbonyl and the other R4 groups are each an organic amino or a hydroxy compound residue], preferably a compound represented by formula II [n is 2; R4 is a sterically hindered amino adjacent to carbonyl] with a polyester. Furthermore, it is preferable that the compound of formula I exists in an amount of 0.1-5.0 pts.wt. based on 100 pts.wt. polyester and the modification of the polyester is preferably performed by adding an effective amount of the compound of formula I to the polyester during or after polycondensation of the polyester.