Adhesive comprising copolymer having repeating unit carrying amide group and carboxyl and/or its ammonium salt and artificial board prepared therewith

An adhesive comprising at least one of the following copolymer A:

• the copolymer A has at least one repeating unit carrying an amide group and a carboxyl and/or its ammonium salt and at least one other repeating unit different from the one carrying an amide group and a carboxyl and/or its ammonium salt,
• wherein the other repeating unit is selected from repeating units derived from the following monomers:
• monoethylenically unsaturated C3-C8 monocarboxylic acid, C1-C10 alkyl ester of monoethylenically unsaturated C3-C8 monocarboxylic acid, amide of monoethylenically unsaturated C3-C8 monocarboxylic acid, vinyl alkyl ether having C1-C8 alkyl, C4-C22 conjugated diene, styrene substituted with one or more substituents selected from C1-C12 alkyl, C1-C12 alkoxy and halogen, vinyl ester of C1-C20 carboxylic acid, vinyl pyrrolidone, (meth)acrylonitrile, hydroxy-containing ethylenically unsaturated monomer, N-vinyl formamide, vinyl imidazole, allylbenzene, indene, methyl indene, and a furan ring-containing compound,
• or
• the other repeating unit is derived from at least one monomer containing carbon-carbon unsaturated double bond derived from reaction material of gasoline, C8 fraction, C9 fraction or coal tar light fraction.