Abstract: Hydroxy functional polysiloxane graft copolymers are provided. The copolymer is crosslinkable by hydroxy-reactive crosslinking agent and, in particular, is suitable for use in thermosetting coating compositions adapted to form a flexible cured coating over a variety of substrates, such as metal and plastic. The copolymer has a number average molecular weight between about 1,300 and about 15,000, has a hydroxyl number between about 30 and about 300, and is the reaction product of carbon-carbon double bond-reactive monoethylenically unsaturated monomer with hydroxy functional carbon-carbon double bond-bearing branched polysiloxane macromonomer. The macromonomer is the reaction product of (i) isocyanato monomer having the formula: ##STR1## with (ii) hydroxy functional polysiloxane reactant containing 0-10 urethane linkages per molecule.

Abstract: Oxazolidones are produced by reacting an organic isocyanate with an epoxide in the presence of a catalyst selected from the group consisting of dialkyl zinc, zinc carboxylate, organozinc chelate compound and trialkyl aluminum. Polyoxazolidones produced according to the present invention are useful starting materials for the manufacture of a wide variety of product including foams, coatings, adhesives, elastomers and the like.