Release agent for linerless pressure sensitive postage stamps
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United States of America Patent
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-
Sep 2, 1997
Grant Date -
N/A
app pub date -
Mar 14, 1996
filing date -
Mar 14, 1996
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An improved release agent for linerless pressure sensitive postage stamps, comprising a low adhesion backsize, preferably organo polysiloxane polyurea block copolymer, as disclosed by Tushaus, et al. (U.S. Pat. No. 5,290,615), containing therein a dispersion of calcium carbonate in the range of 2 to 7 percent by weight, and polyvinyl pyrrolidone in the range of 4 to 10 percent. The combined level of both additives to said low adhesion backsize is about 8 to 12 percent. The preferred levels of each additive are: polyvinyl pyrrolidone at 4 percent and calcium carbonate at 4 percent, to achieve a desired minimum drying time for cancellation ink imposed upon a surface of said release agent.
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