Method for producing water-absorbent resins

Details Method for producing water-absorbent resins Method for producing water-absorbent resins

2007-02-20

2007-02-20

Pezzuto, Helen L. (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S083000, C526S084000, C095S210000, C095S213000, C203S008000, C560S208000, C562S512200, C562S532000, C562S598000, C562S600000

Reexamination Certificate

active

10485484

ABSTRACT:
In a process for preparing water-absorbent resins based on acrylic acid, crude acrylic acid is firstly isolated from the reaction gases from the catalytic gas-phase oxidation of propane, propylene and/or acrolein. This is treated with an aldehyde scavenger and pure acrylic acid is separated by distillation from the treated crude acrylic acid, and this pure acrylic acid can be subjected directly to a free-radical polymerization.

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