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US 5,540,876 AGranted
Gamma radiation treated material
OwnerPeter M. Larson, Lester M. Larsoninventors
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Abstract
Materials and items made of thermoplastic polyesters, such as poly (epsilon-caprolactone), synthetic rubber, such as Transpolyisoprene and Neoprene, and natural rubber, such as balata have improved properties when subjected to gamma radiation in the range from 0.5 to 30 megarads.
Claims9
A method of forming a support sheet comprising the steps of:
- a) forming a preform sheet of poly (epsilon-caprolactone) of average molecular weight greater than about 5,000 having a melting point between about 50.degree. C. and about 100.degree. C.;
- b) subjecting the sheet to gamma radiation in the range from about 0.5 to about 20 megarads;
- c) heating the sheet, to its softening point, until it is melted or clear;
- d) forming the sheet into a desired shape, and
- e) allowing the sheet to cool until hardened.
2 more elements
Dependencies are inferred from the claim text.