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AssigneeH. B. Fuller Licensing & Financing, Inc.
InventorsHarald Werenicz, Franz Maitz, Walter Nussbaumer, Ludwig Stingl, Franz Peter Schmitz
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The present invention relates to polyurethane hot melt adhesive that are hardened by the action of moisture and which contain at least one reaction product from a component that contains NCO groups and an essentially linear hydroxypolyester, hydroxypolyether, and/or hydroxypolyetherester component. In addition, the present invention relates to a procedure for manufacturing a material that is permeable to water only in vapor form, this being in the form of a fibre material, in particular in the form of a web, which is joined to a polyurethane film, in which the fibre material is coated with a polyurethane material and subsequently the polyurethane material is hardened to form a water-vapor permeable film. The present invention also relates to a material that is permeable to water only in vapor form and which is in the form of a fibre material, in particular in the form of a web, that is bonded to a polyurethane film. According to the present invention, a hot melt adhesive with a segmented hydroxypolyester or an hydroxypolyether or an hydroxypolyetherester component is used for this purpose as polyurethane material. The hot melt adhesive according to the present invention can be applied directly or by a transfer technique to the fibre material and is hardened in only one step, by the action of moisture, to form a water-vapor permeable, but otherwise high quality water-proof membrane film.
A procedure for manufacturing a material that is permeable to water only in vapor form, in the form of a fibre material that is provided on its surface with a polyurethane film, in which the fibre material is coated with a polyurethane material and subsequently the polyurethane material is hardened to form a water-vapor permeable film, characterized in that the film is formed from a hot melt adhesive that is hardened by the effects of moisture, which is applied to the fibre material as a layer, directly or through a transfer process, containing at least one isocyanate functional polyurethane consisting essentially of the reaction product of a component that contains NCO groups and a diol component comprising at least one linear dihydroxy polyester, characterized in that the dihydroxy functional polyester is formed from a diacid constituent and a diol constituent, the diol constituent comprising a dihydroxy polyether that has a weight average molecular weight of at least 1000, thereby providing polyether segmenting of said polyester, and wherein the ratio of OH:NCO in said isocyanate functional polyurethane is between 1.0:1.6 and 1.0:2.6.
Dependencies are inferred from the claim text.