Rohm and Haas announced an off-list price increase for acrylic copolymer emulsions, solution polymers, styrene -containing polymers and additives sold to the coatings, graphic arts, paper and textile industries in North America. The increase, which ranges from 5 percent to 8 percent, per wet pound, went into effect Jan. 1, or as contracts allow. The new off-list prices will not exceed list prices, which remain unchanged, according to the company.      The increase is needed to cover higher en...