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
2005-08-02
2010-11-23
Choi, Ling-Sui (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...
C525S057000, C524S002000, C524S003000, C524S557000, C106S724000, C106S725000, C106S727000, C106S823000
Reexamination Certificate
active
07838597
ABSTRACT:
A fluid loss additive for hydraulic cement, comprising a polyvinyl alcohol resin and a fluid loss ameliorating sulfonic acid-functionalized co-resin, where the polyvinyl alcohol has a characteristic viscosity in the range of about 1 to about 25 cps. The invention includes, in some embodiments, an aqueous concentrate of the PVOH resin and the sulfonic acid-functionalized co-resin, where the total resin content is in the range of about 10% to about 40% and the viscosity is less than 15,000 cps. By way of the invention it is possible to adjust hydraulic cement slurry characteristics in real time upon demand and reduce inventory by providing a concentrated aqueous fluid loss additive.
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Beckman Kristi J.
George Michael E.
Sabins Freddie Lyn
Sikora Cory J.
Bernshteyn Michael M
Choi Ling-Sui
Ferrell Michael W.
Sekisui Specialty Chemicals America, LLC
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