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United States of America Patent
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Jul 14, 1992
Issued Date -
N/A
app pub date -
Oct 15, 1990
filing date -
Oct 7, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Acid sized carbonless base paper incorporating a sulphate based filler, particularly calcium sulphate, is less base reactive than otherwise similar paper made using conventional clay (kaolin) fillers. Carbonless paper, particularly CB paper, made from such base is less susceptible to undesired discoloration arising from base reactivity.
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