Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
2007-08-21
2007-08-21
McClendon, Sanza L. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C522S086000, C522S089000, C522S104000, C522S150000, C522S153000, C527S300000, C527S400000, C527S600000, C507S200000, C507S203000, C507S209000, C507S213000, C507S214000
Reexamination Certificate
active
10606256
ABSTRACT:
A method of depolymerizing galactomannan-type polysaccharide polymers and xanthan, preferably galactomannans, to a pre-selected lower molecular weight by irradiation with high energy electron beams. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is depolymerized preferably to a molecular weight of about 150,000 Daltons to about 200,000 Daltons. The depolymerized guar has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.
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Liu Leo Zhaoqing
Priou Christian
Child, Jr. John S.
McClendon Sanza L.
Rhodia Inc.
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