Method of and apparatus for producing a foamed mass of a polyurea elastomer
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United States of America Patent
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-
Oct 20, 1992
Grant Date -
N/A
app pub date -
Mar 13, 1992
filing date -
Mar 19, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Through three separate passages opening in a common plane at right angles to one another into a mixing chamber, three components of a reactant polyurethane or polyurea elastomer composition to form in a mold cavity are introduced. One of the components is an aliphatic polyether amine having primary amino function and substantially free from free hydroxyl groups, catalysts with tertiary amino groups, carbon dioxide as a carbamate reactive with the polyether amine and optionally other inert gases and conventional polyurea additives. The second component is a polyisocyanate or prepolymer thereof and the third component C is water. The reacting mixture is formed through a throttle gap into the mold to form low-density foamed products under low fuming conditions and has no unreacted diisocyanates.
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