| abstract |
(57) [Abstract] [Problem] Viscosity that is excellent in solubility of monomer metal salts such as (meth) acrylic acid metal salts and stability, and that is easy to handle in operations such as casting and coating. The present invention also provides a method for producing a resin composition capable of obtaining a cured resin product having various properties such as heat resistance, transparency, and mechanical strength. SOLUTION: In a solution containing a monomer containing a vinyl group and a polymer, for example, in acrylic syrup, a metal oxide and / or a metal hydroxide, and a monomer containing a vinyl group and a carboxyl group. (Hereinafter, referred to as a carboxylic acid monomer). When carrying out the reaction, water can be added to the above solution, if necessary. Further, acrylic acid and methacrylic acid are preferably used in combination as the carboxylic acid monomer. |