초록 ▼

A process is provided for the free radical polymerization of monomers derived from substituted or unsubstituted acrylic acid/methacrylic acid and esters thereof for the production of a polymer having a narrow molecular weight distribution and an average molecular weight of less than 4000. These poly

A process is provided for the free radical polymerization of monomers derived from substituted or unsubstituted acrylic acid/methacrylic acid and esters thereof for the production of a polymer having a narrow molecular weight distribution and an average molecular weight of less than 4000. These polymers are produced by the solution polymerizing of said monomers wherein 20-40% by weight of the monomer composition is hydroxyalkyl acrylate or methacrylate in the presence of a solvent system suitable for high solids coating applications and in the presence of an initiating amount of a tertiary alkyl hydroperoxide and/or its derivatives having at least 5 carbons wherein the initiator and monomers, alone or in combination, are added continuously at a programmed rate wherein the rate of addition corresponds approximately to the rate of decomposition of said monomer and initiator. These polymers are used for high solids coating applications.

대표청구항 ▼

A process for the free-radical polymerization of monomers derived from substituted or unsubstituted acrylic acid or methacrylic acid or esters thereof comprising solution polymerizing said monomers wherein 20-40% by weight of the monomer composition is hydroxyalkyl acrylate or methacrylate in a temp

A process for the free-radical polymerization of monomers derived from substituted or unsubstituted acrylic acid or methacrylic acid or esters thereof comprising solution polymerizing said monomers wherein 20-40% by weight of the monomer composition is hydroxyalkyl acrylate or methacrylate in a temperature range of 90°-200°C., in the presence of a solvent suitable for high solids coating application, wherein the solvent to monomer ratio is 3:1 to 0.1:1, and in the presence of an initiating amount of about 0.50 to about 10.0 parts by weight per 100 parts of monomer of a tertiary-alkyl hydroperoxide and/or its derivative having a one hour half-life temperature in the range of 50°-190°C. and having at least 5 carbons in the tertiary alkyl component, said derivatives being selected from peroxyketals, dialkyl peroxides, peroxyesters, and monoperoxycarbonates, wherein the initiators and monomers, alone or in combination, are added over a period of at least about 3 hours at a controlled rate wherein the rate of addition corresponds approximately to the rate of decomposition of said monomer and initiator.