Radiation stabilization of polymeric material

Details Radiation stabilization of polymeric material Radiation stabilization of polymeric material

C - Chemistry, Metallurgy

08

K

400/5050, 400/70

C08K 5/34 (2006.01) A61L 2/08 (2006.01) C08K 5/00 (2006.01) C08K 5/3435 (2006.01) C08L 23/02 (2006.01)

Patent

CA 1207481

\ ABSTRACT OF THE DISCLOSURE The present specification discloses semi-crystalline polymers which are suitable for stabilization by irradiation sterilization. In particular, the specification discloses improved additives for semi-crystalline polymers, such as propylene polymer compositions, to improve the properties of the polymer when sub- jected to irradiation. There is disclosed a composition having improved irradiation sterilization stability when subjected to irradiation comprising a semi-crystalline polymer having incorpo- rated therein a mobilizing amount of a non-crystalline liquid mobilizing additive which increases the free volume of the polymer and a hindered amine or its n-oxide, n-hydroxide or n-nitroxide salt wherein the amine nitrogen is contained in a carbon-nitrogen- carbon chain which forms part of the non-aromatic heterocyclic ring and wherein each of the two carbon atoms of the chain is bonded to two of the same or to different lower alkyl groups each containing one to twelve carbon atoms or to an alicyclic group containing four to nine carbon atoms which group sterically hinder the amine.

418933

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