Vibration isolator
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United States of America Patent
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Aug 25, 1987
Grant Date -
N/A
app pub date -
Jun 6, 1985
filing date -
Jul 30, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vibration isolator composed of a low foam urethane elastomer having urethane bonds and a bulk density of 0.4-0.75 g/cm.sup.3 which is prepared from the starting foamable liquid of urethane elastomer composed substantially of (a) a polyether polyol having an average number of functional groups of 2.5-4.5 and a number average molecular weight of 2000-3500, (b) a vinyl monomer-grafted polyol having an average number of functional groups of 2.5-4.0 and the graft ratio is 4-20% by weight, (c) a liquid polybutadiene polyol having hydroxyl terminal group(s), an average number of functional groups of 2.0-3.0 and a number average molecular weight of 2000-7000, (d) an organic polyisocyanate, (e) a chain extender (f) a blowing agent, and (g) a urethanation catalyst, in such ratios that the NCO index is within the range of 90-110, and the concentration of the chain extender, based on the total amount of the five components of (a), (b), (c), (d) and (e), is 0.3.times.10.sup.-3 to 1.5.times.10.sup.-3 mol/g.
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