AQUEOUS POLYMER DISPERSION OF IMPROVED STABILITY, METHOD OF MANUFACTURING THE SAME AND ITS APPLICATION TO THE FORMULATION OF PAINTS

Abstract

Abstract 1. Aqueous dispersion of polymer particles consisting of at least one interpolymer of (A) 95 to 99% by weight of at least one monomer chosen from alkyl methacrylates the alkyl group of which contains from 1 to 8 carbon atoms and alkyl acrylates the all group of which contains from 1 to 8 carbon atoms, and (B) from 1 to 5% by weight of at least one water-soluble monomer copolymerizable with the monomer(s) (A), the said particles having a composite structure comprising a core and a coating, a dispersion characterized in that the coating contains from 50 to 90% mole of the water-soluble monomer(s) of the dispersion and in that the said dispersion may be obtained by a process comprising a first step of polymerisation of the monomer(s) (A) in emulsion in water and a second step consisting in introducing a mixture comprising from 12 to 45% by weight of at least one water-soluble monomer (B) and from 55 to 88% by weight of monomers (A) into the reactor when the degree of conversion of the polymerization reaction has reached a value of at least 82%.

Inventors

• 👤 Jean Guillot
• 👤 C Pichot
• 👤 Brigitte Emelie
• 👤 Claude-Lise Cretenot
• 👤 Alain Vigouroux

Bibliographic Details