Ink-storing body for writing utensil
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United States of America Patent
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Jun 20, 2006
Grant Date -
Nov 18, 2004
app pub date -
Aug 28, 2002
filing date -
Aug 29, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An ink reservoir for a Writing instrument molded from a gas barrier resin such as polyvinyl alcohol, an ethylene vinyl alcohol copolymer resin, polyacrylonitrile, polyamide, a cellulose resin, polyester, polycarbonate and polystyrene, wherein a vapor-scarcely permeable coating layer having a vapor permeability (P1) of 0.5 g/m.sup.2* atm*24hr/25 .mu.m or less at 40.degree. and 90% RH is formed on the above reservoir for a writing instrument. In this ink reservoir for a writing instrument, a gas barrier property is not reduced under the environment of high moisture even if a wall of the ink reservoir is relatively thin and a resin having an excellent transparency is used, and releasing of pressurized air in the ink reservoir and falling of the tip member are not caused.
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