Importance

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Abstract

The invention relates to a one-component moisture-curing polyurethane adhesive composition 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 in the range of from 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, wherein the content of free isocyanate groups in the adhesive composition is in the range of from 14 to 17 wt %. The invention further relates to a method of bonding a first piece of material to a second piece of material using such adhesive composition and to an object comprising a first piece of material and a second piece of material bonded with such adhesive composition, in particular a structural wood product.

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First Claim