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US 2002/0055604 A1Published application
Liquid stable MDI prepolymers and liquid stable curative systems suitable for room temperature casting which yield high performance urethane elastomers
AssigneeAzon USA Inc.
InventorsGerard Scott Freeland, James E. Doyle
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Abstract
The invention relates to liquid stable MDI prepolymers and curative systems which are suitable for room temperature casting and which yield high performance low-shrinkage urethane elastomers upon room-temperature curing, the prepolymer and curative components, the elastomers themselves, and separately packaged prepolymer component and its complementary curative component provided as a single unit or kit.
Claims33
A room-temperature liquid stable prepolymer (P) which is the reaction product of
- a) methylene diphenylisocyanate or a prepolymer of methylene diphenylisocyanate and an about 500-1000 equivalent weight polytetramethylene ether glycol or polyoxypropylene/polyoxyethylene diol or triol having at least 21% residual NCO,
- b) polytetramethylene ether glycol of about 500 to 1000 equivalent weight, and
- c) a polyoxypropylene/polyoxyethylene triol or polyoxypropylene triol of about 1300 to 2000 equivalent weight,
- the percentage by weight in the prepolymer (P) being about 32 to 72% of (a), about 52 to 22% of (b), and about 6 to 15% of (c), and the percentage of residual NCO in the prepolymer (P) being about 6 to 18% by weight,
- the prepolymer (P) having a viscosity at room temperature of about 1200 to 26000 cps,
- which prepolymer (P) is curable and castable at room temperature to yield a high-performance urethane elastomer.
3 more elements
Dependencies are inferred from the claim text.