IMPROVEMENTS IN AND RELATING TO POLYETHYLENES
Patent
·
OSTI ID:4843649
A method is described for upgrading the physical properties of polyethylene by irradiation without impairing its thermoplasticity, moldability, and extrudability while at the same time raising the molecular weight and broadening the range of molecular weight distribution over that of an unirradiated polyethylene. The method consists of exposing the polyethylene pellets, film, or sheet stock to a beta, gamma, or x-radiation dosage ranging from 0.5 megareps up to that dosage which would cause sufficient gelation for mechanically working the polyethylene at a temperature below the fluxing temperature (75 deg C) and until the gel content is less than one per cent by weight. The radiation dosage is usually between one to ten megareps. The polyethylene is worked in a cooled mixer which is closed to the atmosphere. The mechanically worked polyethylene is heated to an elevated temperature for the addition of dyes, fillers, or antioxidants. (N.W.R.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-027682
- OSTI ID:
- 4843649
- Report Number(s):
- GB 871586
- Country of Publication:
- United Kingdom
- Language:
- English
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