Process for preparing impregnated polymer latex compositions
AssigneeKonishiroku Photo Industry Co., Ltd.
InventorsMitsuto Fujiwhara, Syunji Matsuo, Tsuneo Wada, Naoto Abe, Toyoaki Masukawa, Akio Iijima, Keiji Oishi
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Abstract
In the process for preparing impregnated polymer latex compositions by impregnating a hydrophobic substance in dispersed polymer particles in an aqueous polymer latex, the improvement comprises impregnating said hydrophobic substance, wherein the impregnation is effected by mixing said hydrophobic substance which is solid state, a water-miscible organic solvent and aqueous polymer latex wherein a polymer of the polymer latex is prepared from ethene monomers and containing at least one hydrophilic group.
Claims17
In the process for preparing impregnated polymer latex compositions by impregnating a hydrophobic substance into dispersed polymer particles in an aqueous polymer latex, the improvement comprising impregnating said hydrophobic substance, wherein the impregnation is effected by mixing said hydrophobic substance which is in the solid state, with a water-miscible organic solvent and the aqueous polymer latex comprising a dispersion of said polymer particles in water, said polymer of the polymer latex is prepared from ethene monomers and contains at least one hydrophilic group,
- said mixing which effects said impregnation being carried out by one of the following four mixing operations:
- (i) forming a suspension of particles of said hydrophobic substance in said aqueous polymer latex and then adding small portions of said water-miscible organic solvent to said suspension;
- (ii) adding and mixing particles of said hydrophobic substance, and said water-miscible organic solvent, from different hoppers to said aqueous polymer latex at the same time;
- (iii) adding and mixing said aqueous polymer latex, particles of said hydrophobic substance, and said water-miscible organic solvent or in one receptacle at the same time;
- or
- (iv) adding and mixing particles of said hydrophobic substance to a mixture of said aqueous polymer latex and a water-miscible organic solvent;
- whereby said solid state hydrophobic substance is gradually dissolved by said water-miscible solvent while said dissolved hydrophobic substance is being impregnated into said dispersed polymer particles, and finally said polymer particles are finely dispersed in a medium comprising water and said water-miscible solvent.
In the process for preparing impregnated polymer latex compositions by impregnating a hydrophobic substance into dispersed polymer particles in an aqueous polymer latex, the improvement comprising impregnating said hydrophobic substance, wherein the impregnation is effected by mixing said hydrophobic substance which is in the solid state, with a water-miscible organic solvent and the aqueous polymer latex comprising a dispersion of said polymer particles in water, said polymer of the polymer latex is prepared from ethene monomers and contains at least one hydrophilic group,
- said mixing which effects said impregnation being carried out by one of the following four mixing operations:
- (i) forming a suspension of particles of said hydrophobic substance in said aqueous polymer latex and then adding small portions of said water-miscible organic solvent to said suspension;
- or
- (ii) adding and mixing particles of said hydrophobic substance, and said water-miscible organic solvent, from different hoppers to said aqueous polymer latex at the same time;
- whereby said solid state hydrophobic substance is gradually dissolved by said water-miscible solvent while said dissolved hydrophobic substance is being impregnated into said dispersed polymer particles.
Dependencies are inferred from the claim text.