POLYURETHANE FORMULATION WITH HIGH GREEN STRENGTH AND GUNNABILITY Russian patent published in 2015 - IPC C08G18/10 C08G18/28 C08K5/21 C09J175/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a moisture-curable polyurethane formulation intended for joint sealing, method for producing a curable polyurethane formulation and method of bonding materials together using the formulation is also provided. A moisture-curable polyurethane formulation capable of curing to form a reaction product comprises: a) at least one isocyanate-terminated prepolymer wherein the NCO/OH mole ratio is within the range of 5 to 20, b) optionally, additional monomeric/polymeric isocyanate, c) at least one of (i) at least one of, or ii) a urea-based thixotropic additive compound produced by the in situ reaction of the excess of free isocyanate in the isocyanate-terminated prepolymer or the additional monomeric/polymeric isocyanate with an amine in the presence of a carrier in a NCO/NH₂ equivalent ratio of at least 3, d) at least one rheology modifier or filler. The reaction product comprises more than 1 wt % of urea groups. The formulation is capable of reacting the components a, optionally b, c(i) or c(ii) and d. A method of adhering a first substrate to a second substrate comprising applying the polyurethane formulation to a first substrate and contacting the polyurethane formulation-applied first substrate surface with the second substrate. A method for bonding materials together which comprises applying the polyurethane formulation to a first substrate, bringing a second substrate in contact with the formulation applied to the first substrate, and subjecting the applied formulation to moisture which will allow the formulation to cure to an irreversible solid form.

EFFECT: achieved a formulation, capable of being dispensed from a caulking gun, with good adhesion and high green strength to adhesively bond a first substrate weighing at least 500 grams to a second substrate without the need for any holding instrument, wherein a contact surface between the first substrate and the second substrate is at least 116 cm².

27 cl, 3 tbl, 8 ex