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US 5,476,681 AGranted
Rigid polyurethane/polyisocyanurate foams containing paraffinic based oils
AssigneeBASF SE
InventorsAgus Sampara, Rob Hutchings, Tom Harris, Karl Dondoroff, Kerry Bowman
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Abstract
The invention is a rigid polyurethane foam to which a base stock lubricating oil made of at least 55 weight percent paraffinic carbons and less than 10 weight percent aromatic carbons has been added as a hydrophobic agent protecting the polyurethane foam from reacting with environmental moisture. The foam is useful for deposit in railroad spike holes or any structural member having a cavity and where moisture within or on the cavity would otherwise react with the isocyanate to produce an uncontrollable foaming mass.
Claims19
A method of repairing a defect to a structural member comprising;
- (a) applying a polyurethane/polyisocyanurate composition to a defect, said defect having present environmental water and said polyurethane/polyisocyanurate composition comprised of an organic polyisocyanate, a lubricating oil, and a polyol composition comprising:
- (i) one or more compounds having at least two isocyanate reactive hydrogens;
- (ii) a blowing agent comprised of water;
- and,
- (iii) optionally a polyurethane promoting catalyst, a surfactant, emulsifier, crosslinker, and/or trimerization catalyst;
- said lubricating oil comprised of a base stock having at least 55 weight percent carbon atoms in paraffinic form and no more than 10 weight percent carbon atoms in aromatic form;
- and,
- (b) foaming said composition to form a rigid polyurethane/polyisocyanurate foam.
5 more elements
Dependencies are inferred from the claim text.