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    • 3. 发明授权
    • Synthesis of a copolymer containing hydrophilic functionality
    • 具有亲水官能团的共聚物的合成
    • EP1408052B1
    • 2008-08-06
    • EP03021538.8
    • 2003-09-24
    • Ferrania Technologies S.p.A.
    • Franceschini, Paola
    • C08F2/12G03C1/49C08F220/18
    • G03C7/3029C08F2/24G03C1/7614G03C1/95G03C2001/7635
    • Synthesizing a particulate copolymer comprises providing a reaction mixture comprising a reaction medium, a polymerization stabilizer, a water-insoluble ethylenically unsaturated monomer and an ethylenically unsaturated monomer containing hydrophilic functionality; and polymerizing the monomers. The reaction mixture has a viscosity of >=10 cPs at 40[deg]C. Independent claims are also included for: (1) a particulate copolymer dispersion comprising a particulate copolymer of a water-insoluble ethylenically unsaturated monomer and an ethylenically unsaturated monomer containing hydrophilic functionality and a polymerization stabilizer dispersed in a mixture of water and 1-5C aliphatic alcohol(s); (2) a microparticle composition comprising a particulate copolymer and an auxiliary agent, wherein the auxiliary agent is bioactive agent, dye, pigment or gas encapsulated in the copolymer; and (3) a photographic material comprising a support base coated with red-sensitive silver halide emulsion layer(s) comprising a cyan-dye forming coupler, green-sensitive silver halide emulsion layer(s) comprising a magenta-dye forming coupler, blue-sensitive silver halide emulsion layer(s) comprising a yellow-dye forming coupler and an outer gelatin protective layer comprising particulate copolymers of the invention.