Abstract: The use is described of monohydroxy-terminated polybutadienes as reactive or internal plasticizers for polyurethanes. The polyurethanes are made in conventional manner by reacting at least one polyisocyanate with at least one polyol under polyurethane-forming conditions, which may include the presence of a catalyst. In accordance with the invention this reaction is carried out in the presence of a monohydroxy-terminated polybutadiene which may have a molecular weight of 500 to 100,000, preferably 900 to 20,000. As a monohydroxy-terminated polybutadiene is a constituent of the resulting polyurethane, the use of a polybutadiene diol as the polyol is excluded. Short chain polyols and conventional additives may be present and the resulting polyurethane may be in the form of a solid or a foam.

Abstract: A pressure-sensitive adhesive composition with a low content of volatile liquids, such as organic solvents or water, comprises a maleinized liquid polybutadiene blended with one or more tackifying resins and one or more curing agents, suchas a blocked polyamine, the composition containing less than 20% by weight of volatile liquids. The liquid polybutadiene, which can be made by any conventional polymerization mechanism, is maleinized by reaction with meleic anhydride, and it is convenient to add the tackifying resin and any other ingredients of the composition to the maleinized liquid polybutadiene just after the maleinization reaction.