Process for making filament having unique tip and surface characteristics
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United States of America Patent
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May 17, 2016
Grant Date -
Dec 17, 2015
app pub date -
Jun 11, 2014
filing date -
Jun 11, 2014
priority date (Note) -
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Abstract
A process for making a filament for use in a brush implement comprises providing a composite filament comprising an external material and at least one internal material, wherein the tip surface comprises the internal material surrounded by the external material, the internal material having longitudinal shrinkage characteristics that differ from those of the external material; and causing the internal material to shrink inside the external material, whereby the internal material comprising the tip surface sinks relative to the external material comprising the tip surface so that at least one crater is formed at the tip surface of the filament, the at least one crater comprising a bottom formed by the internal material and walls formed by the external material, the at least one crater having a surface edge of a predetermined size and a predetermined shape.
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