| abstract |
PROBLEM TO BE SOLVED: To provide a paper coating agent with an appropriate thickening property at a low shear rate, a good fluidity at a high shear rate, an extremely excellent water retention, and a coating. Provide a water retention agent that is excellent in printability of paper, reduces drying energy by increasing the density, improves productivity by increasing the coating speed, and improves the quality of coated paper. SOLUTION: 2,4-diphenyl- is used as a chain transfer agent. Using 4-methyl-1-pentene, a copolymer obtained by copolymerizing a radical polymerizable hydrophobic monomer excluding an aliphatic conjugated diene monomer and a radical polymerizable hydrophilic monomer As a water retention agent. |