C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
96/47, 400/7021
C08J 3/20 (2006.01) A01N 25/10 (2006.01) C08J 3/215 (2006.01) C08L 33/06 (2006.01) G03C 1/04 (2006.01) G03C 1/06 (2006.01) G03C 7/388 (2006.01)
Patent
CA 1079432
Abstract An improved process is disclosed for uniformly dis- persing hydrophobic materials through a hydrophilic colloid layer such as, for example, a photographically useful layer containing gelatin. The process over which the present invention is a valuable improvement comprises the steps: (a) forming an aqueous dispersion by intermixing the hydrophobic material and an aqueous polymeric latex, optionally including gelatin in the dispersion; (b) forming a wet layer by coating onto a suitable support the aqueous dispersion from step (a); and (c) thereafter removing a substantial proportion of the water from the wet layer through which the hydrophobic material is dispersed. The present process relates particularly to improvements in step (a), wherein the "aqueous dispersion" is formed by gradually blending a concentrated loadable polymeric latex into a solution of the hydrophobic material dissolved in a water-miscible solvent. Optionally some, or most, of the water- miscible solvent can be removed prior to step (c) if desired. This improved process results in the hydrophobic material being absorbed ("loaded") directly into and through the particles of latex without coagulating the latex. Use of this process provides products having valuable, unexpected properties, possibly due to a combination of the size and the nature of the particles which apparently are homogeneous blends of hydrophobe and polymer but retain their latex source identity. - 1 -
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