Novel catalyst system for rim elastomers
AssigneeTexaco Inc.
InventorsMichael Cuscurida, Richard J. G. Dominquez
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Abstract
The invention is a method for making reaction injection molded polyurethane of improved properties. The product comprises the reaction product of a high molecular weight amine based polyol, a low molecular weight active hydrogen containing compound of at least two functionality, a polyisocyanate and suitable additional catalysts. Reaction injection molded elastomers are useful as molded articles of commerce including, but not limited to, vehicle body parts.
Claims8
In a method for making a RIM polyurethane elastomer of significantly improved properties wherein an aromatic polyisocyanate, a polyol of above about 500 equivalent weight, a chain extending agent comprising a low molecular weight active hydrogen containing compound of at least 2 functionality, a fast gelation organo tin catalyst and a delayed action gelation organo tin catalyst are injected via a RIM machine into a mold cavity of the desired configuration the improvement which comprises
- using as the polyol an amine based polyol of at least 500 equivalent weight.
In a method for making RIM polyurethane elastomer of significantly improved properties wherein an aromatic polyisocyanate, a polyol of above about 500 equivalent weight, a chain extending agent comprising a low molecular weight active hydrogen containing compound of at least 2 functionality, a fast gelation organo tin catalyst and a delayed action gelation organo tin catalyst are injected via a RIM machine into a mold cavity of the desired configuration the improvement which comprises using as the polyol based on triethanolamine of at least 500 equivalent weight.
Dependencies are inferred from the claim text.