Process for the polymerization of vinyl chloride
AssigneeTaminco
InventorNicholas M. MARTYAK
Life of this patent
Estimating the term…
Abstract
In a process for the aqueous suspension polymerization of vinyl chloride, alone or in mixture with other monomers, in the presence of at least one of dialkylperoxydicarbonate, peroxyester and diacyl peroxide, the polymerization composition according to the invention comprises at least one dialkylhydroxylamine as a shortstopping agent along with a totally or partially hindered phenolic antioxidant.
Claims9
A process for the aqueous suspension polymerization of vinyl chloride, alone or as a mixture with less than 50% of another vinyl monomer, in the presence of a polymerization initiator comprising at least one compound chosen from dialkyl peroxydicarbonates, peroxy-tert-alkanoates and diacyl peroxides, characterized in that use is made of a polymerization regulating agent comprising at least one mono- or di alkyl substituted N hydroxylamine having the formula:
- HO—N—R1R2
- wherein R1 and R2 may be the same or different, and are selected from H and C1-C12 hydrocarbons, where each hydrocarbon chain may be branched, unsaturated, or have hydrogen substituted with functional groups selected from —OH, —SO, benzyl, amino, mercapto, keto, carboxyl, or where R1 and R2 may form together a cyclic structure, with the proviso that at least one of R1 and R2 is different from H in the amount of 0.0005 to 0.1 parts by weight per 100 parts by weight of monomers, along with a totally or partially hindered phenolic antioxidant.
Polymerization regulating agent for use in a process for the aqueous suspension polymerization of vinyl chloride, alone or as a mixture with less than 50% of another vinyl monomer, using a polymerization initiator comprising at least one compound chosen from dialkyl peroxydicarbonates, peroxy-tert-alkanoates and diacyl peroxides, characterized in that said polymerization regulating agent comprises at least one mono- or di alkyl substituted N hydroxylamine having the formula:
- HO—N—R1R2
- wherein R1 and R2 may be the same or different, and are selected from H and Ci-C12 hydrocarbons, where each hydrocarbon chain may be branched, unsaturated, or have hydrogen substituted with functional groups selected from —OH, —SO, benzyl, amino, mercapto, keto, carboxyl, or where R1 and R2 may form together a cyclic structure, with the proviso that at least one of R1 and R2 is different from H. in the amount of 0.0005 to 0.1 parts by weight per 100 parts by weight of monomers, along with a totally or partially hindered phenolic antioxidant.
Dependencies are inferred from the claim text.