| abstract |
The present invention relates to polyolefin compositions which comprise as UV absorber a synergistic mixture of a) at least one hydroxybenzophenone and at least one 2-hydroxyphenylbenzotriazole with the proviso that the polyolefin is a high density polyethylene of the "Phillips" type or a polyethylene of the metallocene type; b) at least one hydroxybenzophenone and at least one 2-hydroxyphenyltriazine, with the proviso that if the polyolefin is polypropylene, no polyvinylpyridin is present c) at least one hydroxybenzophenone and at least one oxanilide; d) at least one 2-hydroxyphenylbenzotriazole and at least one oxanilide; e) at least one 2-hydroxyphenyltriazine and at least one oxanilide; f) at least one hydroxybenzophenone, at least one 2-hydroxyphenylbenzotriazole and at least one oxanilide; g) at least one hydroxybenzophenone, at least one oxanilide and at least one 2-hydroxyphenyl-triazine; or h) at least one 2-hydroxyphenylbenzotriazole, at least one oxanilide and at least one 2-hydroxy phenyltriazine. |