Patent · US Expired

Enhancing absorption rates of superabsorbents by incorporating a blowing agent

US5154713A · kind A · utility

76Cited by
4References
3Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMar 4, 1992
Grant dateOct 13, 1992
Priority date
Expiry dateMar 4, 2012

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08J2300/10
  • WIPO fieldMedical technology
  • WIPO sectorInstruments

Abstract

An improved superabsorbent polymer having increased rate of water absorption is obtained by the addition, preferably prior to polymerization, of a carbonate blowing agent to a monomer solution of the monomers used to form the superabsorbent polymer. Preferred monomers include (meth)acrylic acids, preferably partially neutralized prior to polymerization and appropriate cross-linking agents. The carbonate cross-linking agents are any carbonate salt soluble or dispersible in the monomer solution, prior to polymerization. The multi-valent cationic salts of carbonate are preferred, especially the complex carbonates, for example, of magnesium.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.