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US 4,726,928 AGranted
Radiation-resistant vinyl halide resin compositions and a process for their production
AssigneeAmerican Hoechst Corporation
InventorsAdam J. Ejk, Mark A. Jachym
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Abstract
Resinous compositions that are stabilized against the deteriorative effect of gamma and other ionizing radiation comprises a vinyl halide resin, from 2% to 4% by weight, based on the weight of the vinyl halide resin, of an organotin mercaptoacid ester, and an epoxy compound in the amount of from 3 parts to 5 parts by weight of the epoxy compound per part by weight of the organotin mercaptoacid ester. The stabilized vinyl halide resin compositions can be used in the aseptic packaging of foods and other perishable materials.
Claims6
A method of sterilizing a packaging material comprising
- (I) providing a packaging material comprising a resinous composition consisting essentially of a mixture of:
- (a) a vinyl halide resin;
- (b) an organotin mercaptoacid ester having the formula
- R.sub.x Sn(SR'COOR").sub.y
- wherein:
- R represents an alkyl group having 1-8 carbon atoms, R' represents an alkylene group having 1 to 4 carbon atoms;
- R" represents an alkyl, aryl, alkaryl or aralkyl group having 1 to 18 carbon atoms, and x and y represent numbers in the range of 1 to 3 whose total is 4;
- and
- (c) an epoxy compound;
- said organotin mercaptoacid ester and said epoxy compound being present in an amount effective to stabilize said composition against the deteriorative effects of ionizing radiation wherein said epoxy compound is present in an amount of from about 3 to about 5 parts by weight precent by weight of said organotion mercaptoacid ester;
- and
- (II) subjecting said material to ionizing radiation for a period of time sufficient to substantially sterilize said packaging.
9 more elements
Dependencies are inferred from the claim text.