REACTION INJECTION MOLDING SYSTEM AND PROCESSES FOR PRODUCING POLYURETHANE ARTICLES
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United States of America Patent
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Issued Date -
Dec 17, 2009
app pub date -
Jun 13, 2008
filing date -
Jun 13, 2008
priority date (Note) -
Abandoned
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Abstract
An externally heated reaction injection molding (“RIM”) system and processes for producing polyurethane articles. The system comprises a mixing chamber for combining a prepolymer and a chain extender and one or more heating systems for heating at least one of the prepolymer and the chain extender upstream of the mixing chamber. In one embodiment, the process comprises injecting a heated prepolymer and/or a heated chain extender into a mixing chamber and initiating a curing of the prepolymer in a mixing chamber. By employing heat to decrease the viscosity of the prepolymer and/or the chain extender, prepolymers and/or chain extenders that have high room temperature viscosities or are in the solid state at room temperature, may be utilized in the RIM system.
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