Radiation-sterilized shaped articles of olefin polymers

• US 3,940,325 A
• Filed: 08/24/1973
• Issued: 02/24/1976
• Est. Priority Date: 08/24/1972
• Status: Expired due to Term

• Current Assignee: Chisso Corporation
• Original Assignee: Chisso Corporation
• Inventors: Hirao, Seiji
• Primary Examiner(s): Bleutge, John C.
• Assistant Examiner(s): Page, Thurman Kennis
• Application Number:
  US05/391,413
• Time in Patent Office: 914 Days
• Field of Search: 204/159.17, 204/159.20, 260/45.85 B, 21/2
• US Class Current: 422/22
• CPC Class Codes: A61L 2/08 Radiation
• CPC Class Codes: B29C 2035/0844 using X-ray
• CPC Class Codes: B29C 2035/085 using gamma-ray
• CPC Class Codes: B29C 71/04 by wave energy or particle radiation , e.g. for curing or vulcanising preformed articles during moulding, e.g. in a mould B29C35/08
• CPC Class Codes: B29K 2023/12 PP, i.e. polypropylene
• CPC Class Codes: C08K 5/13 Phenols; Phenolates
• CPC Class Codes: C08K 5/1345 Carboxylic esters of phenolcarboxylic acids
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof

Abstract

Radiation-sterilized shaped articles of olefin polymers containing 0.01 - 0.5% by weight based on the weight of the olefin polymers, of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate or/and tetrakis [(m methane.

The radiation-sterilized shaped articles are colorless and still have practically acceptable physical properties (melt flow rate and percentage occurrence of cracking), in spite of the fact that they have been irradiated with high energy radiation.

Claims

1. Shaped articles comprising at least one polymer selected from the group consisting of homopolymers of propylene;

homopolymers of propylene containing therein 0.1-4% by weight based on the weight of homopolymers of propylene, of ethylene-propylene rubber;

propylene-ethylene copolymers containing therein 0.5-20% by weight based on the weight of propylene, of ethylene;

high density polyethylenes having a density of 0.950 to 0.965 g/c.c.;

g/cc.;

low density polyethylenes having a density of 0.905 to 0.925 g/c.c.; and

homopolymers of propylene containing therein 0.5-4% by weight based on the weight of homopolymers of propylene, of high density or low density polyethylene and 0.01-0.5% by weight based on the weight of the olefin polymer or polymers, of at least one material selected from the group consisting of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate and tetrakis (methylene(3,5-di-t-butyl -4-hydroxyhydrocinnamate)) methane, and irradiated with a sterilizing dose of high energy radiation.

2. Shaped articles according to claim 1, wherein said olefin polymer or polymers further contain 0.01 to 0.3% by weight based on the weight of the olefin polymer or polymers, of calcium stearate.

3. Shaped articles according to claim 1 wherein said olefin polymer or polymers further contain 0.01 to 0.3% by weight of calcium stearate and 0.01 to 0.5% by weight of at least one material selected from the group consisting of oleic amide and erucic amide, both based on the weight of the olefin polymer or polymers.

4. Shaped articles according to claim 1, wherein said olefin polymer or polymers further contain 0.01 to 0.3% by weight of calcium stearate and 0.01 to 0.5% by weight of at least one compound selected from the group consisting of dilauryl thiodipropionate, distearyl thiodipropionate and distearyl thiodibutyrate, both based on the weight of the olefin polymer or polymers.

5. Shaped articles according to claim 1, wherein said olefin polymer or polymers further contain 0.01 to 0.3% by weight of calcium stearate, 0.01 to 0.5% by weight of at least one material selected from the group consisting of oleic amide and erucic amide and 0.01 to 0.5% by weight of at least one material selected from the group consisting of dilauryl thiodipropionate, distearyl thiodipropionate and distearyl thiodibutyrate, each based on the weight of the olefin polymer or polymers.

6. A process for producing radiation-sterilized shaped articles of an olefin polymer without coloration and degradation in physical properties, which comprises shaping an olefin polymer or polymers containing 0.01 to 0.5% by weight based on the weight of the olefin polymer of at least one material selected from the group consisting of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate and tetrakis (methylene (3,5-di-t-butyl-4hydroxyhydrocinnamate)) methane, and then irradiating with a sterilizing dose of high energy radiation, said olefin polymer being selected from the group consisting of homopolymers of propylene;

homopolymers of porpylene containing therein 0.1-4% by weight based on the weight of homopolymers of propylene, of ethylene-propylene rubber;

propylene-ethylene copolymers containing therein 0.5-20% by weight based on the weight of propylene, of ethylene;

high density polyethylenes having a density of 0.950 to 0.965 g/c.c.;

low density polyethylenes having a density of 0.905 to 0.925 g/c.c.; and

homopolymers of propylene containing therein 0.5-4% by weight based on the weight of homopolymers of propylene, of high density or low density polyethylene.