METHOD OF ADSORPTION OF CATIONIC AND ANIONIC POLYMERS ON THE SURFACE OF PARTICLES AND PAPER OR NONWOVEN PRODUCT CONTAINING SUCH PARTICLES

Method of producing a particle or group of particles intended for use in paper and or nonwovenmaking and having a coating of at least two, preferably at least three, outside each other located thin layers of alternating cationic and anionic polymers, at which the particle or group of particles is treated in consecutive steps with solutions of the alternating cationic and anionic polymers. The amount of the respective polymer to be added in each step is controlled by charge measurements of the treatment solution or a liquid containing the particles or group of particles and the polymer solution, after the treatment in each step in order to determine that substantially all polymer is adsorbed to the particle surface. It is also referred to a paper or nonwoven product containing fibres and or fillers produced according to the method. It is further referred to paper products containing increased amounts of wet strength agent and to tissue paper having improved wet strength. Metodo para producir una particula o grupo de particulas pretendidas para uso en fabricacion de papel y/o no tejido y que tiene un revestimiento de cuando menos dos, de preferencia por lo menos tres, cada tercera capas delgadas colocadas de polimeros alternos cationicos y anionicos, en donde la particula o grupo de particulas se trata en pasos consecutivos con soluciones de los polimeros cationicos y anionicos alternos. La cantidad del polimero respectivo que se va a anadir en cada paso se controla mediante mediciones de carga de la solucion de tratamiento o un liquido que contiene las particulas o grupo de particulas y la solucion de polimero, despues del tratamiento en cada paso a fin de determinar que substancialmente todo el polimero es adsorbido a la superficie de particula. Tambien se refiere a un producto de papel o no tejido que contiene fibras y/o rellenos producidos de conformidad con el metodo. Se refiere ademas a productos de papel que contienen cantidades incrementadas de agente de resistencia en humedo y con papel de seda que tiene resistencia en humedo mejorada.