Inhibiting discoloration of halogen-containing polymers after radiation
AssigneeOccidental Chemical Corporation
InventorsQi Wang, Sandor Nagy, Mary K. Cocoman, Thomas F. Smolka, Mingzhu Xu
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Abstract
Disclosed is a method of inhibiting the discoloration of a halogen-containing polymer, particularly poly(vinyl chloride), after exposure to gamma radiation. About 0.0001 to about 5 wt % of a dithiocarbamate or a dithiophosphate stabilizer is added to the polymer. The stabilizer can be added during polymerization or during compounding. Also disclosed is a composition of a halogen-containing polymer and a dithiocarbamate or dithiophosphate stabilizer.
Claims20
A composition comprising a halogen-containing polymer and about 0.0001 to about 5 wt % of a dithiocarbamate or dithiophosphate stabilizer.
A method of inhibiting the discoloration of a halogen-containing polymer after exposure to gamma radiation comprising adding to said polymer about 0.001 to about 0.3 wt % of a dithiocarbamate stabilizer.
A method of inhibiting the discoloration of a halogen-containing polymer after exposure to gamma radiation comprising adding to said polymer 0.001 to about 0.4 wt % of a zinc dithiocarbamate stabilizer.
Dependencies are inferred from the claim text.