WATER-ABSORBING RESIN BASED ON POLYACRYLIC ACID (SALT), METHOD OF PRODUCING SAID RESIN AND ACRYLIC ACID USED IN POLYMERISATION TO OBTAIN WATER-ABSORBING RESIN Russian patent published in 2010 - IPC C08F20/06 C08F2/44 C08F8/00 

FIELD: chemistry.

SUBSTANCE: invention enables high-output production of a water-absorbing resin having an improved relationship between absorption capacity and water-soluble polymer. The polymerisation reaction is easier to control taking into account that the said properties of the water-absorbing resin are inversely related. The method of producing a water-absorbing resin through polymerisation of a composition based on acrylic acid, including acrylic acid and its salt, involves (a) a stage where radical polymerisation takes place with formation of a hydrogel of a cross-linked polymer and a stage (b) for drying the hydrogel of the cross-linked polymer while heating. Content of non-polymerised organic compound in the composition based on acrylic acid ranges from 1 to 1000 pts. wt, and the non-polymerised organic compound has solubility parametre of (1.0-2.5)×10⁴ (J·m³)^1/2. The obtained water-absorbing resin has final content of non-polymerised organic compound ranging from 0.01 to 10 pts. wt and final content of iron ranging from 0.01 to 1 pts. wt. The invention also pertains to a water-absorbing resin obtained through polymerisation of the composition based on acrylic acid, a sanitary product, a composition based on acrylic resin for producing the water-absorbing resin and a method of preparing the composition based on acrylic acid.

EFFECT: obtained resin does not have a smell, is colourless and has good absorption properties.

16 cl, 1 tbl, 35 ex