| abstract |
PURPOSE:To improve the efficiency of speaker (increase in sound pressure because of improved magnetic flux density) and to attain stable adhesion and rationalization, by applying a fast-curing single liquid adhesive excellent in physical and chemical strength to the adhesion between a magnet and a plate for sepaker field. CONSTITUTION:The magnet and the plate constituting the magnetic field are adhered by using the adhesives taking a composition comprising at least one kind of 1,1-di-substitution diene represented in a 2-cyanoacrylic ester or a 2- cyanoacylic ester and Structual Formula as the major component. In Formula, R1 is alkyl group, allyl group, aralkyl group or halogen having 1-5 hydrogen and carbon atoms, R2 is alkyl group having 1-5 hydrogen or carbon atoms, R3 is alkyl group having 1-5 hydrogen or carbon atoms, and X and Y are the same or different and selected from cyano group, carboxylic ester group, ethylsulfonic group, phenylsulfonic group, formyl group, acetyl group, benzoyl group, diethylphosphonyl group, amide group and phenyl group. |