Method for grafting an unsaturated monomer into a polysaccharide and for depolymerization of polysaccharide, polysaccharide, and cosmetic composition

摘要

"A method for grafting an unsaturated monomer into a polysaccharide and for the decolimerization of polysaccharide, polysaccharide, and cosmic composition". A method of grafting galactomannan-type polysaccharide polymers, preferably guar, into a functional group by high energy electron beam irradiation in the presence of an unsaturated monomer comprising the desired functional group. The method may include depolymerization of the grafted polymer to a preselected low molecular weight. Preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is also depolymerized, preferably to a molecular weight of less than about 700,000 Daltons, and more preferably to a molecular weight of from about 100,000 Daltons to about 250,000 Daltons. The depolymerized guar most preferably has a polydispersity of less than about 3.0 and is useful in oil well fracturing to increase oil production.