Gamma radiation resistant carbonate polymer compositions
AssigneeThe Dow Chemical Company
InventorVaughn M. Nace
Life of this patent
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Abstract
Carbonate polymer compositions are rendered gamma ray resistant by the incorporation of 500 to 50,000 ppm of one or more polyether polyols. Compared to the controls, the compositions of the invention have a reduced yellowing after exposure to cobalt 60 radiation.
Claims18
A solid carbonate polymer composition with improved resistance to gamma radiation which comprises a carbonate polymer and 500 to 50,000 parts per million of one or more polyether polyols or the alkyl ethers thereof.
A solid carbonate polymer composition with improved resistance to gamma radiation which comprises a carbonate polymer and 500 to 50,000 parts per million of one or more polyether polyols and/or the alkyl ethers thereof derived from the reaction of one or more alkylene oxides with a member of the group consisting of glycols, triols, tetrols, pentols, sugars, and sugar alcohols.
A solid carbonate polymer composition with improved resistance to gamma radiation which comprises a carbonate polymer and 500 to 50,000 parts per million of one or more polyether polyols having the formula
- RO--CH.sub.2 --C(R.sub.1)H--[--O--CH.sub.2 --C(R.sub.1)H--].sub.n --OR
- where
- R is independently hydrogen or an alkyl group of 1 to 4 carbon atoms,
- R.sub.1 is hydrogen, methyl or ethyl, and
- n is a number having an average value of 1 to 1000.
A solid carbonate polymer composition with improved resistance to gamma radiation which comprises a carbonate polymer and 500 to 50,000 parts per million of polypropylene glycol.
A process for the production of solid carbonate polymers having improved resistance to gamma radiation which comprises incorporating into said polymers 500 to 50,000 parts per million of one or more polyether polyols or the alkyl ethers thereof.
A process for the production of solid carbonate polymers having improved resistance to gamma radiation which comprises incorporating into said polymers 500 to 50,000 parts per million of one or more polyether polyols wherein said polyols have the formula
- RO--CH.sub.2 --C(R.sub.1)H--[--O--CH.sub.2 --C(R.sub.1)H--].sub.n --OR
- where
- R is independently hydrogen or an alkyl group of 1 to 4 carbon atoms,
- R.sub.1 is hydrogen, methyl or ethyl, and
- n is a number having an average value of 1 to 1000.
Dependencies are inferred from the claim text.