Polyurethane and composite thereof

Claim 1

A mobile, curable, reactive sealant, casting or potting composition consisting essentially of; 100 parts of a liquid prepolymeric polytetramethylene glycol polyol resin having a functionality from 1.7 to 3.5 and a molecular weight from 500 to 5,000; 0.05 to 0.2 parts per 100 parts of glycol prepolymer resin (phr) of a metal salt curing catalyst selected from the group consisting of dibutyltindilaurate, zinc octoate, lead octoate and zirconium acetylacetonate; and - 20phr of a tetraalkanol amine curing agent of the formula: ##STR3## where R 2 is alkylene of 2-6 carbon atoms and R 4 is selected from straight or branch chain alkylene or polyether containing 1-8 carbon atoms; and 5- 70parts by weight of a diisocyanate, at least 50% by weight of which is a cycloaliphatic isocyanate selected from compounds of the formula: ##STR4## where R 1 is alkylene of 1- 10 carbon atoms and R 3 is a lower alkyl of 1-8 carbon atoms.

Claim 3

A method of forming a cured, elastomeric, hydrolytically stable resin comprising the steps of: mixing a first part consisting essentially of in relative parts by weight; 100 parts of a liquid prepolymeric polytetramethylene glycol polyol resin having a functionality from 1.7 to 3.5 and a molecular weight from 500 to 5,000; 0.05 to 0.2 parts per 100 parts of glycol prepolymer resin (phr) of a metal salt curing catalyst selected from the group consisting of dibutyltindilaurate, zinc octoate, lead octoate and zirconium acetylacetonate; and 4-20 phr of a tetraalkanol amine curing agent of the formula: ##STR5## where R 2 is alkylene of 2-6 carbon atoms and R 4 is selected from straight or branch chain alkylene or polyether containing 1-8 carbon atoms; with a second part consisting essentially of 50-70 parts by weight of a diisocyanate, at least 50% by weight of which is a cycloaliphatic isocyanate selected from compounds of the formula: ##STR6## where R 1 is alkylene of 1- 10 carbon atoms and R 3 is a lower alkyl of 1-8 carbon atoms to form a mobile composition; and curing the mobile composition to a fully cured, rigid state.

Claim 4

A method of forming a cured, elastomeric, hydrolytically stable resin comprising the steps of: mixing a first part consisting essentially of in relative parts by weight; 100 parts of a liquid prepolymeric polytetramethylene glycol polyol resin having a functionality from 1.7 to 3.5 and a molecular weight from 500 to 5,000; 0.05 to 0.2 parts per 100 parts of glycol prepolymer resin (phr) of a metal salt curing catalyst selected from the group consisting of dibutyltindilaurate, zinc octoate, lead octoate and zirconium acetylacetonate; and 4-20 phr of a tetraalkanol amine curing agent of the formula: ##STR5## where R 2 is alkylene of 2-6 carbon atoms and R 4 is selected from straight or branch chain alkylene or polyether containing 1-8 carbon atoms; with a second part consisting essentially of 50-70 parts by weight of a diisocyanate, at least 50% by weight of which is a cycloaliphatic isocyanate selected from compounds of the formula: ##STR6## where R 1 is alkylene of 1- 10 carbon atoms and R 3 is a lower alkyl of 1-8 carbon atoms to form a mobile composition; and curing the mobile composition to a fully cured, rigid state.