Archival aperture card
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United States of America Patent
Stats
-
Nov 23, 1993
Issued Date -
N/A
app pub date -
Jul 31, 1992
filing date -
Apr 12, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Archival quality aperture cards manufactured from stock formulation including: 1. between 40 and 60% southern softwood kraft pulp; 2. between 60 and 40% northern mixed hardwood pulp; 3. between 1.5 and 2.5% on total pulp, calcium carbonate for alkaline reserve; 4. between 0.05 and 1.0% on total pulp, alkyl ketene dimer as an internal sizing agent; 5. between 0.2 and 1.0% on total pulp, cationic potato starch for internal bonding improvements; 6. between 0.5 and 2.0% on total pulp, cationic potato starch as a surface sizing agent; 7. between 0.5 and 2.5% solids added to the surface sizing agent, alkyl ketene dimer as a slip agent; and 8. between 0.01 and 0.3% dyed rayon granitizing fibers.
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