| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of giant particles, and reduce a spot contamination by making an oily substance containing compound, such as a polyalkylene oxide in the side chain, and of which the principal chain is polydimethyl siloxane, in a micro-capsule which encloses the oil-like substance with a polyurea urethane resin film. SOLUTION: In this micro-capsule which encloses an oily substance with a polyurea urethane resin film, in the oily substance, a compound such as a polyalkylene oxide in the side chain, and of which the principal chain is polydimethyl siloxane, is contained. In this case, the HLB value of the compound is set 1 to 2. The HLB value is an index to show the balance of the hydrophilic property-lipophilic property of a nonionic surface active agent, and normally is within a range of 0 to 20, and as the number becomes smaller, a higher lipophilic property is indicated. By this constitution, a giant particle can be prevented from being generated in the micro-capsule, and when being used for a pressure-sensitive recording paper, a spot contamination (coloring contamination) can be reduced. At the same time, the pressure-sensitive recording characteristics are not unfavorably affected. |
