Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2006-06-14
2010-06-22
Lipman, Bernard (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S501000, C524S502000, C524S515000, C526S072000, C526S210000, C526S317100, C528S481000, C528S503000
Reexamination Certificate
active
07741400
ABSTRACT:
The present invention provides a production process by which a water-absorbent resin of excellent quality can be obtained at a low cost by reasonable steps in aqueous solution polymerization. The process for producing a water-absorbent resin comprises the step of polymerizing an aqueous solution of water-absorbent resin-forming monomers including acrylic acid and/or its sodium salt as major components, wherein: (1) the aqueous solution has a monomer component concentration of not less than 45 weight %; (2) the polymerization is carried out while water is evaporated so that the ratio (concentration ratio) between a solid component concentration in a hydropolymer as formed by the polymerization and a solid component concentration in the aqueous monomer solution will not be less than 1.10; and (3) the solid component concentration in the hydropolymer as formed by the polymerization is not more than 80 weight %.
REFERENCES:
patent: 4155888 (1979-05-01), Mooth
patent: 4525527 (1985-06-01), Takeda et al.
patent: 4552938 (1985-11-01), Mikita et al.
patent: 4703067 (1987-10-01), Mikita et al.
patent: 4777231 (1988-10-01), Bailey et al.
patent: 4820742 (1989-04-01), Alexander et al.
patent: 4914170 (1990-04-01), Chang et al.
patent: 4957984 (1990-09-01), Itoh et al.
patent: 4985518 (1991-01-01), Alexander et al.
patent: 5258448 (1993-11-01), Mallo et al.
patent: 5380808 (1995-01-01), Sumiya et al.
patent: 5478879 (1995-12-01), Kajikawa et al.
patent: 5883158 (1999-03-01), Nambu et al.
patent: 6071976 (2000-06-01), Dairoku et al.
patent: 6174978 (2001-01-01), Hatsuda et al.
patent: 6187828 (2001-02-01), Woodrum et al.
patent: 6228930 (2001-05-01), Dairoku et al.
patent: 6313231 (2001-11-01), Hosokawa et al.
patent: 6417425 (2002-07-01), Whitmore et al.
patent: 6562879 (2003-05-01), Hatsuda et al.
patent: 2001/0025093 (2001-09-01), Ishizaki et al.
patent: 2001/0053807 (2001-12-01), Miyake et al.
patent: 1224024 (1999-07-01), None
patent: 0206808 (1986-12-01), None
patent: 0207714 (1987-01-01), None
patent: 58208 (1980-04-01), None
patent: 147512 (1980-04-01), None
patent: 147809 (1981-11-01), None
patent: 71907 (1983-04-01), None
patent: 18712 (1984-01-01), None
patent: 275607 (1988-11-01), None
patent: 165610 (1989-06-01), None
patent: 318022 (1989-12-01), None
patent: 129207 (1990-05-01), None
patent: 215801 (1990-08-01), None
patent: 175319 (1992-06-01), None
patent: 725935 (1995-01-01), None
patent: 7155591 (1995-06-01), None
patent: 9124879 (1997-05-01), None
patent: 45812 (1998-02-01), None
patent: 182750 (1998-07-01), None
patent: 275608 (1998-11-01), None
patent: 181005 (1999-07-01), None
patent: 228604 (1999-08-01), None
Runxiong et al., Study on the High Water Absorbent Resin Obtained by the Selfcopolymerization of Acrylic Acid-Sodium Acrylate, Shanxi Chemical Industry, vol. 27, No. 2, Jun. 1998.
Chemical Engineering Handbook, sixth edition, edited by Society of Chemical Engineers, published by Maruzan Co., Ltd. 1999, p. 843, Table 16.4.
Azumi Takashi
Dairoku Yorimichi
Fujino Shin-ichi
Fujita Yasuhiro
Irie Yoshio
Lipman Bernard
Nippon Shokubai Co. , Ltd.
Roylance Abrams Berdo & Goodman L.L.P.
LandOfFree
Water-absorbent resin, hydropolymer, process for producing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Water-absorbent resin, hydropolymer, process for producing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water-absorbent resin, hydropolymer, process for producing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4180759