Urethane molded products for polishing pad and method for making same
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United States of America Patent
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-
May 29, 2001
Grant Date -
N/A
app pub date -
Aug 5, 1999
filing date -
Jun 4, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Urethane molded products for polishing pad comprise two types of cells having different sizes in a urethane molded products formed by mixing and curing an isocyanate-terminated urethane prepolymer and an active hydrogen-containing compound. The molded products may be made by procedure comprising mixing expanded microballoons having a size of 10 to 50 .mu.m and expanded microballoons having a size of 80 to 100 .mu.m with the prepolymer and active hydrogen-containing compound and curing the mixture.
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