Self-contained pressure sensitive recording paper.

摘要

A self-contained pressure sensitive recording material having reduced tendency of spontaneous background staining and capable of forming an impressed image of deep color, comprising a supporting material and coated thereon a layer composed of (1) a colorless dye as color former, (2) a phenolic resin or a salicyclic acid derivative or its metal salt as color developer, (3) starch particles, (4) a pigment and (5) a binder; either said color former and/or color developer being in the form of liquid composition and encapsulated in microcapsules of a melamine-formaldehyde resin as wall material. The color developer is a phenolic resin or a salicyclic acid or a metal salt thereof and the starch particles are present in an amount of at least 1.5 times the weight of the encapsulated material(s). It is preferable for both the former and developer to be microencapsulated and for microencapsulation of the developer to be carried out by in situ encapsulation.