Patent ID: 8399595

Claim:
A two part composition comprising: A. an isocyanate functional group containing component comprising one or more polyisocyanates and one or more isocyanate functional group containing prepolymers having in their backbones the residue of one or more chains of one or more polypropylene oxide, copolymers of ethylene oxide and propylene oxide or mixtures thereof wherein equivalent weight of the chains are predominantly greater than about 780 and the prepolymer having a molecular weight of about 2,000 or greater and a functionality of 2 or greater, wherein the isocyanate functional prepolymer ahs an isocyanate content of about 6 to about 35 percent by weight; B. an isocyanate reactive component comprising one or more polypropylene oxides, copolymers of ethylene oxide and propylene oxide or mixtures thereof having equivalent weights predominantly about 960 or greater and terminal groups which are reactive with isocyanate groups; C. one or more low molecular weight compounds having two or more isocyanate reactive groups and a molecular weight of 120 or less comprising one or more multifunctional alcohols, multifunctional alkanol amines, one or more adducts of multifunctional alcohol and an alkylene oxide, one or more adducts of a multifunctional alkanol amine and an alkylene oxide or a mixture thereof with the proviso that the adducts containing alkylene oxides have an average 1 . 5 alkylene oxide units or less per chain and the low molecular weight compounds contain straight chain hydrocarbon backbones wherein the low molecular weight compounds are present as a residue in the isocyanate functional group containing prepolymer, as a component of the isocyanate reactive component or both; D. one or more catalysts for the reaction of isocyanate functional groups with isocyanate reactive groups wherein the catalyst may be located in the isocyanate functional group containing component or the isocyanate reactive component; and E. one or more fillers present in an amount of greater than 10 percent by weight of the composition; wherein the catalyst comprises one or more diazabicycloalkanes and one or more diazabicycloalkene salts and the mole ratio of the one or more diazabicycloalkanes to the one or more diazabicycloalkane salts is about 9.0:1.0 to about 1.0:9.0; wherein the composition exhibits a glass transition temperature of about −40° C. or less and a G-modulus of 8 MPa or greater after complete cure.