TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The reaction product additionally comprises second polyurethane that does not bear reactive free hydroxyl groups. Preferred Components: The reactive free hydroxyl groups are terminal hydroxyl groups directly linked to the hydroxylated and optionally alkoxylated polydiene oligomer or polymer (A1). The A1 is: a hydrogenated hydroxylated and optionally alkoxylated polydiene oligomer or polymer; or a hydroxylated and optionally alkoxylated polybutadiene oligomer or polymer. The reaction product has a hydroxyl mean value of at least 1 mg potassium hydroxide/g, preferably 1.01-20 mg hydroxide/g. The polyisocyanate of the isocyanate component is aliphatic, cycloaliphatic and/or aromatic polyisocyanates. The hydroxyl functional ethylenically unsaturated compound, preferably hydroxy monofunctional compound, has a (meth)acrylate functionality 1-5 and comprising hydroxy alkyl (meth)acrylates, alkoxylated hydroxy alkyl (meth)acrylates, hydroxyl-functional epoxy (meth)acrylates, hydroxyl-functional multifunctional (meth)acrylates, hydroxyl-functional urethane (meth)acrylates, hydroxylfunctional polyether (meth)acrylates or hydroxyl-functional polyester (meth)acrylates. The polyurethane has 1-15 ethylenic unsaturations per chain. The polyurethane polymer or oligomer (I) is present in the form of a mixture with a second polyurethane polymer or oligomer excepted that neither X1 nor X2 is hydrogen, with both X1 and X2 is identical and corresponding to a urethane group bearing 1-5 (meth)acrylate groups. The curable composition is curable by radiation, preferably by UV, laser, LED or EB (electron beam) or by peroxide cure or dual cure or by cure with hydroxyl-reactive compounds. The curable composition is a coating composition or an adhesive composition, preferably for electronic devices or as a component for/in solar panels or as a component in battery or in inkjet printing microcircuits, or a sealant composition or an encapsulant composition. The curable composition further comprises at least one further component comprising reactive diluents, non-reactive diluents, fillers, colorants, pigments, matting agents, tackifiers, plasticizers, rheology modifiers, antioxidants, stabilizers, wetting agents, flowing agents, adhesion promoters, catalysts or initiators. The material is an adhesive, preferably for electronic devices or as a component of solar panels or as a component in battery or in inkjet printing microcircuits. Preferred Method: The method further comprises forming a blend, where the blend comprises A, B, at least one catalyst, optionally at least one inhibitor and optionally at least one (meth)acrylate-functionalized monomers as diluent. The A2 and the isocyanate component are reacted to form an intermediate product and the intermediate product is then reacted with A1. EXAMPLE - 46.71 g of 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, 0.47 g of trisnonylphenylphosphite (inhibitor), 0.93 g of thiodiethylene bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)proprionate and 0.42 g of dibutyltin dilaurate (catalyst) were charged into a 1 l reaction flask equipped with an agitator, liquid addition funnel, thermometer and gas inlet tube. This mixture was heated to 40 degrees C under agitation and dry air sparge. Next, 24.87 g of 2-hydroxyethyl acrylate were charged over 25 minutes. After the exotherm, the flask was heated to 60 degrees C and held for 30 minutes. Then, 393 g of 1,3-butadiene, homopolymer, hydrogenated, 2-hydroxyethyl-terminated were charged over 30 minutes. After the exotherm, the reactor was heated to 85 degrees C. The reaction was held at 85 degrees C for at least 3 hours, until the level of isocyanate was equal to or lower than 0.06%. The heater and agitation were tuned off. Once the reactor temperature cooled to 60 degrees C, the product was poured out into a container and testing on the final properties was performed.