One-component moisture-curable adhesive composition

Abstract

A one-component moisture-curing polyurethane adhesive composition is provided, comprising an isocyanate-functional prepolymer obtainable by reacting (a) one or more polyisocyanates comprising methyl diphenyl diisocyanate; and (b) a polyol mixture comprising (b1) a linear butylene oxide-based diol with two primary hydroxyl groups; and (b2) a polyether triol with three secondary hydroxyl groups wherein 55 to 75% of the hydroxyl groups in polyol mixture (b) are hydroxyl groups from butylene oxide-based diol (b1), wherein the equivalent ratio between isocyanate groups in (a) and hydroxyl groups in (b) is in the range of from 3.5 to 7.0, and wherein the content of free isocyanate groups in the adhesive composition is in the range of from 14 to 17 wt %. A method of bonding a first piece of material to a second piece of material using such adhesive composition, and an object made using the method, are also provided.

Dependencies are inferred from the claim text.