Bituminous polyurethane interpenetrating elastomeric network compositions as coatings and sealants for roofing and other applications

A bituminous polyurethane interpenetrating elastomeric network composition comprising:

• fifty percent by weight of rubberized asphalt having a penetration index number of 30,
• thirty-six percent by weight of polyether polyol,
• four percent by weight of a curing agent blend consisting of 3,5-dimethylthio-2,6-toluenediamine and 3,5-dimethylthio-2,4-toluenediamine,
• a less than one percent amount of dibutyltin dilaurate, and
• ten percent by weight of diphenylmethane diisocyanate.

An in situ polymerization method of preparing a bituminous polyurethane interpenetrating elastomeric network composition comprising a bituminous material including rubber modified oxidized asphalt, a polyol blend having a polyol and a curing agent blend consisting of 3,5-dimethylthio-2,6-toluenediamine and 3,5-dimethylthio-2,4-toluenediamine, and an isocyanate;

• said method comprising the steps of:
• heating said bituminous material in a first container at least to its molten temperature,
• providing said polyol blend in a second container,
• mixing said heated bituminous material and said polyol blend together to form a reagent mixture, and
• adding said isocyanate to said reagent mixture immediately before application to a surface to form in situ said bituminous polyurethane interpenetrating elastomeric network composition.

A bituminous polyurethane interpenetrating elastomeric network composition comprising a rubberized oxidized asphalt, a polyol, an asphalt soluble curing agent and an isocyanate;

• said curing agent chosen from a group consisting of polyoxly(methyl-1,2,-ethanediol), alpha-hyrdoxyomega-(2-aminomethylethoxy)-ether with 2-ethyl-2-(hydroxmethyl)-1,3-propanediol (3:1);
• diethyltoluenediamine;
• di-(methylthio)toluenediamine;
• 1,6-hexamethylene diamine;
• trimethylol propane;
• 3,5-dimethylthio-2,6-toluenediamine;
• 3,5-dimethylthio-2,4-toluenediamine;
• said composition made through a method comprising the steps of:
• heating said rubberized oxidized asphalt in a first container at least to its molten temperature,
• mixing said polyol having said asphalt soluble curing agent added thereto to form a polyol blend in a second container,
• mixing said rubberized oxidized asphalt and said polyol blend together to form a reagent mixture, and
• adding said isocyanate to said reagent mixture immediately before application to a surface to provide for an in situ formation of said solventless bituminous polyurethane interpenetrating elastomeric network composition.

A method of preparing a bituminous polyurethane interpenetrating elastomeric network composition comprising a rubberized asphalt, a polyol blend of polyol and a curing agent, and an isocyanate;

• said method comprising:
• (a) heating a rubber mix to at least molten temperature of the asphalt;
• (b) adding an aromatic curing agent as a compatabilizer for the asphalt and polyol and to achieve faster curation time, said curing agent chosen from a group consisting of polyoxy(methyl-1,2,-ethanediol), alpha-hyrdoxyomega-(2-aminomethylethoxy)-ether with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol(3:1);
• diethyltoluenediamine;
• di-(methylthio)toluenediamine;
• 1,6-hexamethylene diamine;
• trimethylol propane;
• 3,5-dimethyltio-2,6-toluenediamine;
• 3,5-dimethylthio-2,4-toluenediamine;
• (c) adding a catalyst to the polyol to accelerate the polyurethane formation kinetics;
• and
• (d) mixing an isocyanate with the heated rubberized asphalt and polyol immediately before spray application of the composition on substrates;
• wherein said catalyst, said rubberized asphalt, the polyol and said isocyanate form a formulation having an induction time ranging from approximately one to four hundred twenty seconds and a gelation time ranging from approximately thirty to four hundred ninety five seconds.

A bituminous polyurethane interpenetrating elastomeric composition comprising:

• a hot melt crumb rubber modified oxidized asphalt,
• a polyol,
• an isocyanate;
• and
• a curing agent for allowing the composition of crumb rubber modified oxidized rubberized asphalt, polyol and isocyanate to cure;
• wherein said crumb rubber modified oxidized asphalt increases the polarity of the asphalt for increased compatibility and reaction between the asphalt and said isocyanate;
• wherein said curing agent is added to said polyol to form a polyol blend prior to mixing said polyol blend with said hot melt crumb rubber modified oxidized asphalt;
• wherein the mixing of said polyol blend with said crumb rubber modified oxidized asphalt yields a reagent mixture;
• wherein said reagent mixture is mixed with the isocyanate through an in Situ polymerization reaction;
• wherein said catalyst, said rubberized modified oxidized asphalt, the polyol and said isocyanate form a formulation having an induction time ranging from approximately one to four hundred twenty seconds and a gelation time ranging from approximately thirty to four hundred ninety five seconds;
• wherein said curing agent is chosen from the group consisting of polyoxy(methyl-1,2,-ethanediol), alpha-hyrdoxyomega-(2-aminomethylethoxy)-ether with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol(3:1);
• diethyltoluenediamine;
• di-(methylthio)toluenediamine;
• 1,6-hexamethylene diamine;
• trimethylol propane;
• 3,5-dimethylthio-2,6-toluenediamine;
• 3,5-dimethylthio-2,4-toluenediamine.