| 摘要 |
PROBLEM TO BE SOLVED: To obtain a urethane-acrylic polymer water dispersion making a urethane-acrylic polymer stably dispersible into water without using an emulsifying agent, providing a filmed material of the dispersion having excellent water resistance, excellent strength and elongation characteristics, capable of readily designing these physical properties. SOLUTION: A urethane-acrylic polymer hybrid water dispersion is prepared, then 80-10 wt.% of a monomer for nontackiness for a polymer consisting essentially of a (meth)acrylic acid alkyl ester and having >=273 glass transition temperature based on 20-90 wt.% of the solid content of the dispersion is mixed thereto and the mixture is subjected to polymerization treatment to produce the objective urethane-acrylic water dispersion which is a room-temperature nontacky water dispersion of urethane-acrylic polymer composed of 10-50 wt.% of a polyol component, 2-20 wt.% of a polyisocyanate component and 40-90 wt.% of an acrylic monomer component, and provides a filmed material having >=0.5 kg/mm2 modulus of elongation and >=300% elongation at break in the tension test of the filmed material.
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