Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2007-03-20
2007-03-20
Smith, Duane (Department: 1724)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S059000, C525S060000, C526S082000, C526S084000, C524S394000, C524S563000, C524S570000, C524S579000
Reexamination Certificate
active
10769039
ABSTRACT:
A dispersing agent suitable for suspension polymerization of vinyl compounds, comprising a polyvinyl alcohol resin containing carbonyl groups in its molecule and having a block character of remaining fatty acid ester groups of at least 0.5 and an absorbance of at least 0.1 measured at each of wavelengths of 215 nm, 280 nm and 320 nm with respect to a 0.1% by weight aqueous solution of the polyvinyl alcohol resin, wherein the ratio of absorbance at 320 nm to absorbance at 280 nm is at least 0.3. The dispersing agent has an excellent surface activity and can suppress foaming which may occur in the suspension polymerization of vinyl compounds.
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Smith Duane
The Nippon Synthetic Chemical Industry Co., Ltd.
Ware Fressola Van Der Sluys & Adolphson LLP
Wu Ives
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