Lightweight filler and a process for its manufacture
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United States of America Patent
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Feb 21, 1995
Grant Date -
N/A
app pub date -
Feb 3, 1992
filing date -
Feb 5, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A lightweight filler containing a non-woven fabric of substantially two-dimensionally oriented spun fibers which are loosened up and held together by microspheres of plastic material. For manufacturing the lightweight fillers, particles of the unexpanded first stage of microspheres in the form of an aqueous suspension are suspended in a two-dimensionally oriented spun non-woven fabric, the so-obtained material is dried and heated to a temperature necessary for expanding the particles and for the required period of time.
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