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
2005-05-10
2005-05-10
Lipman, Bernard (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S329200, C525S355000, C525S382000, C526S310000
Reexamination Certificate
active
06890996
ABSTRACT:
The present invention provides a branched polyvinyl imidazoline acid salt which, when used in waste water treatment, especially sewage treatment, forms flocs and decreases the water content of a dehydrated cake, a polymeric flocculent comprising the branched polyvinyl imidazoline acid salt, and a process for preparing the branched polyvinyl imidazoline acid salt. The branched polyvinyl imidazoline acid salt has a Huggins' constant k′ of 0.2 to 1.2 and an intrinsic viscosity [η] of 2 to 20 based on measurements at 30° C. in a 0.1 mol/l aqueous solution of sodium chloride.
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Higashino Toshiya
Shimosato Shinji
Lipman Bernard
Tosoh Corporation
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