| abstract |
[Problem] To provide a coated paperboard having significantly improved surface strength and excellent in water resistance, ink drying property, printing gloss, suitability for blister pack and sizing property, and improved non-stickiness. Provided is a copolymer latex for use in a coating composition of a coated paperboard which has been excellent in coating operability. (A) Aliphatic conjugated diene monomers 20 to 8 0% by weight, (b) 0.5 to 10% by weight of an ethylenically unsaturated carboxylic acid monomer, and (c) 10 to 79.5% by weight of another copolymerizable monomer. (A) the copolymer is -100 to 5 It has at least two glass transition points in the range of 0 ° C., the difference between the highest glass transition point and the lowest glass transition point is 5 ° C. or more, and the zeta potential on the surface of the (b) copolymer particles is − Provided is a copolymer latex for use in paperboard coating compositions that is between 100 and -10 mV. |