Method of producing a particle or group of particles having a coating of polymers interacting with each other

Abstract

Method of producing a particle or group of particles having a coating of at least two, preferably at least three, outside each other located thin layers of interacting polymers, at which the particle or group of particles is treated in consecutive steps with solutions of the interacting polymers. Excess of the previous polymer is removed between each treatment step alternatively the respective polymer is added only in such an amount in each step that substantially all polymer is absorbed to the particle surface. It is also referred to a paper- or nonwoven product containing fibers and/or fillers containing particles or groups of particles of the mentioned kind.

1 . Method of producing a particle or group of particles having a coating of at least two, preferably at least three, outside each other located thin layers of interacting polymers, at which the particle or group of particles is treated in consecutive steps with solutions of the interacting polymers, characterized in 
 that excess of the previous polymer is removed between each treatment step alternatively that the respective polymer is added only in such an amount in each step that substantially all polymer is adsorbed to the particle surface.    
     
     
         2 . Method as claimed in  claim 1 , characterized in 
 that the particle is a fiber.    
     
     
         3 . Method as claimed in  claim 2 , characterized in 
 that the fiber is a cellulosic fiber.    
     
     
         4 . Method as claimed in  claim 2 , characterized in 
 that the fiber is a synthetic or regenerated fiber.    
     
     
         5 . Method as claimed in  claim 1 , characterized in 
 that the particle is a filler particle or another type of particle used in papermaking.    
     
     
         6 . Method as claimed in any of the preceding claims, characterized in 
 that the interacting polymers are alternating cationic and anionic polyelectrolytes or ampholytes.    
     
     
         7 . Method as claimed in any of the preceding claims, characterized in 
 that each of said thin layers has a thickness of between 1 and 100 Å.    
     
     
         8 . Method as claimed in any of the preceding claims, characterized in 
 that each of said thin layers has a thickness between 7 and 20 Å.    
     
     
         9 . Paper or nonwoven product, characterized in 
 that it contains fibers, filler particles or other particles produced according to the method of any of claims  1 - 8 .