申请人:ELF ATOCHEM NORTH AMERICA, INC.
公开号:EP0303279A2
公开(公告)日:1989-02-15
There are provided reactive hindered amine light stabilizers of the formula
wherein
R is e.g., hydrogen, hydroxyl or alkyl of 1 to 20 carbons;
R1 is, hydrogen or lower alkyl of 1 to 4 carbons;
R2 is, e.g., hydrogen or alkyl of 1 to 20 carbons;
R3 is, e.g., a direct bond or an alkylene or branched alkylene diradical of 1 to 14 carbons; and
R4 is, e.g., hydrogen or a primary or secondary alkyl group of 1 to 8 carbons, containing a light stabilizing group, a heat stabilizing group, and a reactive hydrazide functionality in the same molecule. The reactive stabilizers are prepared by reacting 4-amino-2,2,6,6-tetraalkylpiperidines with diesters (or mono ester acid chlorides) of dicarboxylic acids followed by hydrazinolysis of the ester group of the intermediate mono ester-amide. The compounds are useful for introducing permanent heat and light stability to coreactive polymers or copolymers.
提供了反应型受阻胺光稳定剂,其式如下
式中
R 是氢、羟基或 1 至 20 个碳原子的烷基;
R1 是氢或 1 至 4 个碳原子的低级烷基;
R2 是氢或 1 至 20 个碳原子的烷基;
R3 是直接键或碳原子数为 1 至 14 的亚烷基或支链亚烷基二环;以及
R4 是氢或 1 至 8 个碳原子的伯烷基或仲烷基,在同一分子中含有光稳定基、热稳定基和活性酰肼官能团。活性稳定剂是通过 4-氨基-2,2,6,6-四烷基哌啶与二羧酸的二酯(或单酯酸氯化物)反应,然后对中间单酯酰胺的酯基进行肼解来制备的。这些化合物可为芯活性聚合物或共聚物带来永久的热稳定性和光稳定性。