Particulate water absorbing agent, water-absorbent core and...

Details Particulate water absorbing agent, water-absorbent core and... Particulate water absorbing agent, water-absorbent core and...

2006-04-06

2010-06-29

Pyon, Harold Y (Department: 1796)

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

Synthetic resins

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

C525S329500, C525S329700, C525S384000, C428S402000, C252S194000

Reexamination Certificate

active

07745537

ABSTRACT:
The present invention provides a particulate water absorbing agent for absorbent cores which is excellent in powder conveying property, and achieves sufficient absorption performances for use in absorbent cores in particulate water absorbing agents including a water absorbing resin as a principal component, and which further is suitable for practical applications. In the present invention, characteristics that had not been known conventionally at all, i.e., “permeability potential under pressure (PPUP)” and “frictional charge being a positive charge” of the particulate water absorbing agent are regulated at a time, and furthermore, regulation of the “moisture content of 2 to 10% by weight” is perfected. Also, the particulate water absorbing agent including (A) a water-swelling crosslinked polymer having a constitutional unit derived from an unsaturated monomer containing an acid group and/or a salt thereof; and (B) water fulfills certain requirements.

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The Rising Materials of Sanitary—Napkins and Paper Diapers, 1994, and partial English translation of col. 3 of document.

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