초록 ▼

In preparing microcapsules for carbonless duplicating sheets using aminoaldehyde polycondensate as a capsule wall in a system in which the capsule wall is formed around the hydrophobic material in hydrophilic medium, wherein said hydrophilic medium comprises a combination of an anion-modified polyvi

In preparing microcapsules for carbonless duplicating sheets using aminoaldehyde polycondensate as a capsule wall in a system in which the capsule wall is formed around the hydrophobic material in hydrophilic medium, wherein said hydrophilic medium comprises a combination of an anion-modified polyvinyl alcohol derivative containing sulfo group or sulfonyldioxyd group and an anion-modified water-soluble polymer containing a carboxyl group. The present invention provides a process for producing a high-concentration, low-viscosity microcapsule slurry having advantages such as easy workability, good stability for emulsion, etc.

대표청구항 ▼

Process for producing microcapsules containing hydrophobic core material for carbonless duplicating sheets which comprises forming capsule walls by forming and accumulating aminoaldehyde polycondensate around a hydrophobic material in hydrophilic medium, wherein said hydrophilic medium comprises a c

Process for producing microcapsules containing hydrophobic core material for carbonless duplicating sheets which comprises forming capsule walls by forming and accumulating aminoaldehyde polycondensate around a hydrophobic material in hydrophilic medium, wherein said hydrophilic medium comprises a combination of anion-modified water-soluble polymer containing carboxyl group including, as a component, at least one member selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, itaconic acid, and anhydrides or partial light metal salts thereof and an anion-modified polyvinyl alcohol derivative containing sulfo group and/or sulfonyldioxy group in the range of a mixing ratio by weight of 10:90 to 90:10, the saponification degree of said anion-modified polyvinyl alcohol derivative ranging from 93 to 99 percent, and sulfo group or sulfonyldioxy group content of said anion-modified polyvinyl alcohol derivative ranging from 0.5 to 20 mol percents.