Alkyl hydroxylamine compounds and their use for shortstopping free radical polymerizations

摘要

This invention provides a method for shortstopping free radical polymerization reactions using combinations of N-isopropylhydroxylamine (IPHA) or salts thereof with either primary or secondary alkyl hydroxylamines, or with at least two primary alkyl hydroxylamines. A method for producing elastomers using the aforesaid shortstopping agents is also provided.

主权项

1. A method for terminating a free radical initiated emulsion polymerization reaction comprising adding, to an emulsion comprising at least one monomer, a shortstopping agent comprising N-isopropylhydroxylamine (IPHA) or salts thereof and at least one alkyl hydroxylamine compound which is different from said IPHA or salts thereof and is selected from the group consisting of a primary alkyl hydroxylamine, a secondary alkyl hydroxylamine, and mixtures thereof, wherein said at least one alkyl hydroxylamine comprises N-tertiary-butylhydroxylamine (TBHA).