C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
21/3, 400/9443,
C08L 23/10 (2006.01) A61L 2/08 (2006.01) C08J 3/28 (2006.01) C08K 5/3462 (2006.01) C08L 23/12 (2006.01) C08L 23/16 (2006.01) D01F 1/10 (2006.01) D01F 6/06 (2006.01)
Patent
CA 2010438
1890014 STABILIZED GAMMA-IRRADIATABLE POLYPROPYLENE FIBERS AND STERILIZABLE ARTICLES MADE THEREWITH ABSTRACT OF THE DISCLOSURE Excellent stabilization of polypropylene (PP) fibers exposed to sterilization levels of gamma radiation, is obtained with a hybrid stabilizer having a N-(substitut- ed)-1-(piperazin-2-one alkyl) group at one end and a (3,5- dialkyl-4-hydroxyphenyl)-.alpha., .alpha.-disubstituted acetamide at the other. When this hybrid of a hindered amine with a hindered phenol is combined through a disubstituted alpha carbon atom of the acetamide in a single molecule, it affords the advantages of each group with respect to its stabilization against oxidation, but without the known inherent disadvantages of either group. This molecule is N-(substituted)-1-(piperazin-2-one alkyl)- .alpha. -(3,5-dialkyl- 4-hydroxyphenyl)-.alpha., .alpha.-substituted acetamide molecule ("3,5- DHPZNA" for brevity). When the hybrid stabilizer is incor- porated into PP fibers which are exposed to gamma irradia- tion, the PP fibers exhibit only a barely noticeable discoloration, yet are inculcated with a unique property: though exposed to 4 Mrad of gamma radiation, the PP fibers suffer essentially no loss of their original, pre-irradia- ted tensile strength after about seven months at 60°C in an oven. This property is atypical of PP fibers stabilized with several other hindered phenols and hindered amines tested. The unexpected retention of tensile strength in 3,5-DHPZNA stabilized PP fibers used in articles exposed to a sterilizing dosage level of gamma radiation, is of great practical value. Particularly in such articles as clothing and household goods made from woven or non-woven fabrics of dyed or pigmented PP fibers, in which goods slight discoloration is acceptable, this invention is of commercial importance.
Jennings Eileen
John Ta-Yvah Lai
Jennings Eileen
John Ta-Yvah Lai
Swabey Ogilvy Renault
The B.f. Goodrich Company
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