Rapid setting polymers from bicyclic amide acetals/polyols/polyisocyanates
AssigneeAshland Oil, Inc.
InventorAnil B. Goel
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Abstract
The process for preparing a polyurethane which sets rapidly and can be demolded within minutes by the reaction of a bicyclic amide acetal, a polyol and a polyisocyanate in the presence of a plasticizer such as dioctyl phathalate and a polyurethane catalyst such as stannous octoate is described.
Claims12
The process for preparing a rapid setting, bubble free rigid polyurethane of improved properties comprising reacting a bicyclic amide acetal conforming to the formula ##STR2## Wherein R, R' and R"' independently represent hydrogen or an alkyl group having from 1 to 18 carbon atoms, and R'" also represents an alkyl ether group having from 1 to 18 carbon atoms, an aryl ether or alkaryl ether group having from 6 to 20 carbon atoms, R" represents an alkyl grup having from 1 to 18 carbon atoms, an aryl group having from 6 to 12 carbon atoms or an alkaryl group having from 7 to 20 carbon atoms, a poly isocyanate and a polyol in the presence of a plasticizer selected from the group consisting of carboxylic acid esters, organic phosphites, organic phosphates, alkylene carbonates, lactones, fatty oils, cyclic polyethers, aromatic compounds free from ester groups, partially hydrogenated aromatic compounds free from ester groups, and halogenated aliphatic compounds boiling above a temperature in the range of from about room temperature to about 200.degree. C.
The process of claim 6 wherein the equivalent ratio of polyisocyanate:combined bicyclic amide acetal/polyol is in the range of from 0.8:1 to 3:1, respectively.
Dependencies are inferred from the claim text.