Abstract: An unsaturated alkyd having a number-average molecular weight of at least 5000 and having terminal carboxyl groups is provided by esterification and then deglycolization reaction of an .alpha.,.beta.-unsaturated polybasic acid or an polyhydroxy alcohol followed by reaction with polybasic acid anhydride to substitute more than 10 mole % of terminal hydroxyl groups with carboxyl groups. High molecular weight unsaturated polyester resin is also provided by formulating the unsaturated alkyd with a copolymerizable monomer such as styrene. The polyester resin can be widely used in a various applications by employing the excellent physical properties thereof.

Abstract: A method for producing a high molecular weight saturated polyester comprising adding to a saturated polyester with the terminal group being substantially hydroxyl group, having a number average molecular weight of 5,000 or more and being in the molten state, diisocyanate containing isocyanate group the amount of which corresponds to 1/10 to 2 equivalents of the amount of the hydroxyl group.

Abstract: An electric power supply connector such as a plug or a plug adapter for supplying a power source voltage to an electrical appliance. The connector has conductive connecting legs of a metallic material having high electrical conductivity and formed to be projected from or recessed into the surface of a main part of the connector. An actuating member is resiliently urged to extend from the inside to the outside of the connector so as to be able to project from a surface of the main part of the connector.