| 摘要 |
PURPOSE:To provide above subjected bonding agent comprising copolymerization metal salt of (metha) acrylic acid and aromatic monomer or methacrylic acid alkylester and which does not react with leuco-dye or developed color agency and develops deeply upon heating and has superior watertight coating. CONSTITUTION:Bonding agent comprising effective component made by neutralization of copolymerization products consisting of (A) 30-80%, preferably 40-70% by weight of acrylic acid or methacrylic acid, (B) 20-70%, preferably 30-60% by weight of aromatic monomer and/or C1-4 alkyl metacrylic acid alkylester and (C) 0-30% of other monomer which is copolymerizable therewith and making alkaline metal salt from more than 20% of carboxyl radical and metal salt of II group of periodic table from more than 20%. As the beforementioned metal salt, alkaline metal salt such as lithium, natrium, kalium and metal salt of II group of periodic table such as magnesium calcium and zinc are shown for example. |
