Back to results
US 2008/0188821 A1Published application
Production of Polymers by Spray Polymerization
AssigneeBASF SE
InventorsDennis Losch, Volker Seidl, Uwe Stueven
Life of this patent
Estimating the term…
Abstract
Water-absorbing polymeric particles are produced by spray polymerization of a monomer solution in a process wherein the monomer solution is spray dispensed and at least one crosslinker accumulates in the region of the droplet surface, and are useful in hygiene articles.
Claims10
A process for producing water-absorbing polymeric particles by spray polymerization of a monomer solution comprising
- a) at least one ethylenically unsaturated acid-functional monomer,
- b) at least one crosslinker,
- c) optionally one or more ethylenically and/or allylically unsaturated monomers copolymerizable with the monomer a), and
- d) optionally one or more water-soluble polymers onto which the monomers a), b) and c) can be at least partly grafted, the monomer solution being spray dispensed, wherein the at least one crosslinker b) accumulates at the droplet surface.
1 more element
Water-absorbing polymeric particles comprising
- at least one polymerized ethylenically unsaturated acid-functional monomer which, optionally, may be at least partially neutralized,
- ii) at least one polymerized crosslinker,
- iii) optionally one or more polymerized ethylenically and/or allylically unsaturated monomer copolymerizable with the monomer identified under i), and
- iv) optionally one or more water-soluble polymer onto which the monomer identified under i) is at least partly grafted, wherein a concentration of the polymerized crosslinker ii) is higher in a region of a particle surface than in the particle interior and a crosslinker used equilibrates in less than 10 seconds in an ASTM D3825 measurement of dynamic surface tension.
1 more element
Dependencies are inferred from the claim text.