Thioglycolate and thiopropionate secondary stabilizers
AssigneeWitco Chemical Corporation
InventorsKoei-Liang Liauw, Michael H. Fisch
Life of this patent
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Abstract
Certain substituted thioglycolates and thiopropionates were found useful as secondary stabilizers for polymers, particularly polyvinyl chloride, when used in conjunction with metal octanoates, such as zinc octanoate, as the primary stabilizer. The specific thioglycolates and thiopropionates are those formed by thio adducts to the double bond of a monomer, such as the product of reacting isooctyl thioglycolate with glycidyl acrylate, to provide isooctyl S-2(glycidyloxycarbonyl)ethyl thioglycolate, as an example.
Claims17
A thioglycidyl ester compound having the formula R.sub.1 -S.sub.y -A-S.sub.y R.sub.2, wherein
- A is (CH.sub.2).sub.x --O.sub.n --(CH.sub.2).sub.x
- x is 0 to 2;
- n is 0 or 1;
- y is 0 or 1, with the proviso that at least one y is 1;
- R.sub.1 is ##STR8## with R.sub.3 being alkyl having one to about six carbon atoms or hydrogen;
- and R.sub.2 may be R.sub.1 ;
- an alkyl having one to about twelve carbon atoms, or carbalkoxy having one to about twelve carbon atoms in the alkoxy group.
A stabilizer composition for a vinyl halide, polymer, comprising a primary vinyl halide polymer stabilizer selected from the group consisting of an organometallic compound, an epoxy compound and a metal carboxylate and a thioglycidyl ester compound having the formula:
- R.sub.1 -S.sub.y -A-S.sub.y -R.sub.2
- wherein:
- A is (CH.sub.2).sub.x --O.sub.n --(CH.sub.2).sub.x
- x is 0 to 2;
- n is 0 or 1;
- y is 0 or 1, with the proviso that at least one y is 1;
- R.sub.1 is ##STR9## with R.sub.3 being alkyl having one to about 6 carbon atoms or hydrogen;
- R.sub.2 is R.sub.1, lower alkyl having one to about 12 carbon atoms, or carbalkoxy having one to about 12 carbon atoms in the alkoxy group.
Dependencies are inferred from the claim text.