Stabilised polypropylene

Details Stabilised polypropylene Stabilised polypropylene

C - Chemistry, Metallurgy

08

K

C08K 5/00 (2006.01) C08K 5/13 (2006.01) C08K 5/3435 (2006.01) C08K 5/524 (2006.01) C08L 23/10 (2006.01) C08L 23/12 (2006.01) C08L 35/00 (2006.01)

Patent

CA 2487275

A polypropylene composition comprises: (a) a first stabilising component consisting of 100 ppm or less based on the weight of the polypropylene of a phenolic antioxidant or a mixture of phenolic antioxidants; (b) a second stabilising component consisting of 500 to 1000 ppm based on the weight of the polypropylene of a phosphite antioxidant or a mixture of phosphite antioxidants; and optionally (c) a third stabilising component consisting of 100 ppm to 5000 ppm based on the weight of the polypropylene of a hindered amine light stabiliser or a mixture of such stabilisers. The polypropylene composition advantageously is in the form of fibres. A preferred phenolic antioxidant is 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6 dimethylbenzyl)-1,3,5- triazine-2,4,6-(1H, 3H, 5H)-trione(Lowinox 1790). A preferred phosphite antioxidant is tris(2,4-di-t-butylphenyl) phosphite (Alkanox 240). A preferred optional hindered amine light stabiliser is dimethyl succinate polymer with 4- hydroxy-2,2,6,6-tetramethyl-1-piperidine (Lowilite 62).

Une composition de polypropylène contient : (a) un premier composant stabilisant comprenant 100 ppm ou moins, en fonction de la masse du propylène, d'un antioxydant phénolique ou d'un mélange d'antioxydants phénoliques ; (b) un deuxième composant stabilisant comprenant 500 à 1000 ppm, en fonction de la masse du polypropylène, d'un antioxydant de phosphite ou d'un mélange d'antioxydants de phosphite; et facultativement (c) un troisième composant stabilisant comprenant 100 ppm à 5000 ppm, en fonction de la masse du polypropylène, d'un photostabilisant aminique inhibé ou d'un mélange de ces stabilisants. La composition de polypropylène se présente avantageusement sous la forme de fibres. Un antioxydant phénolique préféré est 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6 dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H, 3H, 5H)-trione(Lowinox 1790). Un antioxydant de phosphite préféré est tris(2,4-di-t-butylphenyl) phosphite (Alkanox 240). Un photostabilisant aminique inhibé facultatif préféré est un polymère succinate de diméthyle avec 4-hydroxy-2,2,6,6-tetramethyl-1-piperidine (Lowilite 62).

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