Alkyltin sulfanyl diester thiols
View Patent ↗Disclosed herein are compounds of the formula: (R) x —Sn—(R′) 4-x wherein: R is alkyl; R′ is a moiety selected from the group consisting of: w is 0 or 1; x is 1 or 2; y is 1, 2, 3, or 4; and Z is a linear, branched, cyclic, or aromatic hydrocarbon. These compounds are excellent stabilizers for halogen-containing resins, such as PVC.
1. A composition comprising:
(A) a halogen-containing resin; and
(B) an amount effective to stabilize the halogen-containing resin against elevated temperatures, UV light, oxidation, and high shear forces of at least one compound of the formula:
(R) x —Sn—(R′) 4-x
wherein:
R is alkyl;
R′ is a moiety selected from the group consisting of:
w is 0 or 1;
x is 1 or 2;
y is 1, 2, 3, or 4; and
Z is a linear, branched, cyclic, or aromatic hydrocarbon.
2. The composition of claim 1 wherein R is alkyl of from 1 to 12 carbon atoms.
3. The composition of claim 2 wherein R is methyl, butyl, or octyl.
4. The composition of claim 1 wherein the compound is selected from the group consisting of dimethyltin bis[di(2-mercaptoethyl)succinate], monomethyltin tris[di(2-mercaptoethyl)succinate], monomethyltin tris[di(2-mercaptoethyl)carbonate], dimethyltin bis[di(2-mercaptoethyl)carbonate], and mixtures thereof.
5. The composition of claim 1 , wherein the halogen-containing resin is a member selected from the group consisting of PVC, polyvinyl bromide, and polyvinylidene chloride.
6. The composition of claim 1 , wherein the effective amount is within a range of from about 0.5 to about 1.50 parts of the compound of (B) per hundred parts the resin of (A).
7. The composition of claim 1 , further comprising at least one additive selected from the group consisting of lubricants, fillers, pigments, flame retardants, UV absorbers, impact modifiers, and processing aids.
8. A method for stabilizing a halogen-containing resin against elevated temperatures, UV light, oxidation, and high shear forces comprising adding to said halogen-containing resin a stabilizing amount of at least one compound of the formula:
(R) x —Sn—(R′) 4-x
wherein:
R is alkyl;
R′ is a moiety selected from the group consisting of:
w is 0 or 1;
x is 1 or 2;
y is 1, 2, 3, or 4; and
Z is a linear, branched, cyclic, or aromatic hydrocarbon.
9. The method of claim 8 wherein R is alkyl of from 1 to 12 carbon atoms.
10. The method of claim 9 wherein R is methyl, butyl, or octyl.
11. The method of claim 9 , wherein said compound is selected from the group consisting of dimethyltin bis[di(2-mercaptoethyl)succinate], monomethyltin tris[di(2-mercaptoethyl)succinate], monomethyltin tris[di(2-mercaptoethyl)carbonate], dimethyltin bis[di(2-mercaptoethyl)carbonate], and mixtures thereof.
12. The composition of claim 1 , wherein the compound is dimethyltin bis[di(2-mercaptoethyl)succinate].
13. The composition of claim 1 , wherein the compound is a mixture of dimethyltin bis[di(2-mercaptoethyl)succinate] and monomethyltin tris[di(2-mercaptoethyl)succinate].
14. The method of claim 8 , wherein the compound is dimethyltin bis[di(2-mercaptoethyl)succinate].
15. The method of claim 8 , wherein the compound is a mixture of dimethyltin bis[di(2-mercaptoethyl)succinate] and monomethyltin tris[di(2-mercaptoethyl)succinate].