PURPOSE: To prolong the potlife of an adhesive and obtain a sufficient open time, by treating the surface to be coated with a specific polyvalent metallic compound, applying a high polymeric adhesive composition containing carboxylic acid groups, etc. in the high polymeric chain, and bonding the surfaces to be bonded.
CONSTITUTION: The surfaces to be bonded are pretreated with a polyvalent metallic compound, e.g. magnesium oxide or aluminum chloride, of GroupsIW VIII in the periodic table, and a high polymeric adhesive composition containing carboxylic acid groups and/or acid anhydride groups in the high polymeric chain, preferably isobutylene-maleic anhydride copolymer, is applied thereto to carry out the bonding of the surfaces. A filler, e.g. wood meal or wheat flour, or PVA, phenolic resin, etc. may be added to the high polymeric adhesive composition.
USE: Preparation of veneers with precious wood.
YOSHIGA IKUO
AKITA YASUO
