Method for producing stabilized polymer

Details Method for producing stabilized polymer Method for producing stabilized polymer

2006-03-06

2010-02-16

Choi, Ling-Siu (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

active

07662893

ABSTRACT:
A method for producing a stabilized polymer comprising adding at least one kind of a phenolic antioxidant masked with an organic aluminum and represented by general formula (I) in a catalyst system or a polymerization system, before or during polymerization, on gas-phase polymerization of a monomer having an ethylenic unsaturated bonding,wherein R1and R2, each is independently a hydrogen atom, an alkyl group having 1 to 9 carbon atoms, a cycloalkyl group or an arylalkyl group; X is an alkylene group having 1 to 8 carbon atoms; R3is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and R4is an alkyl group having 1 to 30 carbon atoms.

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