Non-xenoestrogenic stabilizers for organic materials
View Patent ↗A non-xenoestrogenic phosphorus-containing stabilizer for organic materials is disclosed wherein the stabilizer is selected from the group consisting of phosphorus-containing compounds of the structures wherein y in an integer of from 6 to 20, and where Z is a linking group, m is 0 or 1, n is an integer of at least 2, the asterisks are independently selected terminal groups, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 are independently selected from the, group consisting of hydrogen, alkyl groups, aralkyl groups, or halogen groups and Q is selected from the group consisting of where R 11 is alkyl or aralkyl, and
1. A method for stabilizing a thermoplastic polyolefin comprising adding to said polyolefin a non-xenoestrogenic stabilizer of the structure
wherein y is an integer of from 6 to 20 and said polyolefin is elected from the group consisting of polyethylene, polypropylene, polyisobutylene, polymethylbutene-1, polymethylpentene-1, polybutene-1, polystyrene, polyisobutylene, ethylene-propylene copolymers having at least a majority of propylene, propylene-butene-1 copolymers, propylene-isobutylene copolymers, and blends of a majority of polypropylene with a minority of polyethylene, propylene, and polybutene-1, and blends of propylene and polyisobutylene.
2. The method of claim 1 wherein the thermoplastic polyolefin is polyethylene or polypropylene.
3. The method of claim 1 wherein the stabilizer is bis(2,4-di-t-butylphenyl)octylphosphite.
4. The method of claim 2 wherein the stabilizer is bis(2,4-di-t-butylphenyl)octylphosphite.
5. The method of claim 2 wherein the thermoplastic polyolefin is polypropylene.
6. The method of claim 5 wherein the stabilizer is bis(2,4-di-t-butylphenyl)octylphosphite.