Carbonless developer sheet
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United States of America Patent
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-
Mar 25, 1986
Grant Date -
N/A
app pub date -
Aug 13, 1984
filing date -
Aug 13, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a recording sheet comprising a support having a layer of color developer capable of reacting with oil-soluble, basic, chromogenic dyes to produce rapidly a mark of improved color intensity and improved fade resistance. In addition to the conventionally used constituents such as binders, whitening agents, and fillers, the coating comprises (a) a phenol-formaldehyde condensate oligomer mixture, (b) an aromatic carboxylic acid, and (c) an inorganic magnesium compound, preferably magnesium oxide or magnesium hydroxide. Best results are obtained when components a, b, and c are present at ratios of 50 parts oligomer, 1.0-2.5 parts acid, and 10-40 parts magnesium compound.
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