Process for production of water-absorbing resin

Details Process for production of water-absorbing resin Process for production of water-absorbing resin

2006-06-30

2011-12-27

Rabago, Roberto (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S053000, C525S194000, C525S221000, C525S262000, C525S301000, C525S329900, C525S379000, C525S381000, C525S382000, C526S215000, C526S217000, C526S317100

Reexamination Certificate

active

08084544

ABSTRACT:
Process for preparing a water-absorbent resin comprising carrying out a reversed-phase suspension polymerization in multi-steps of two or more steps. The water-absorbent resin is prepared by subjecting a water-soluble ethylenically unsaturated monomer to the reversed phase suspension polymerization. This process for preparing a water-absorbent resin involves adding an aminocarboxylic acid compound to at least one step in the second and subsequent steps to carry out the polymerization reaction. The resulting water-absorbent resin can be suitably used in a hygienic material. The water-absorbent resin has a high degree of water-retention, including a high degree of water absorption under pressure. It also has a high water absorption rate, and contains only a small amount of water-soluble substances.

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