Molecular weight reduction of polysaccharides by electron beams

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...

Reexamination Certificate

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C522S086000, C522S089000, C522S104000, C522S150000, C522S153000, C527S300000, C527S400000, C527S600000, C507S200000, C507S203000, C507S209000, C507S213000, C507S214000

Reexamination Certificate

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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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