Paper strength agent, method of using the same, and method of enhancing strength properties of paper

摘要

The invention relates to a strength agent for paper, board or the like. The strength agent comprises a first component, which is refined cellulosic fibers having a refining level of 70° SR, and a second component, which is a synthetic cationic polymer having a charge density of 0.1-2.5 meq/g, determined at pH 2.7, and an average molecular weight of 300 000 g/mol. The invention relates also to a use of the strength agent and to a method for increasing strength properties of paper, board or the like.