Lamberti Spa

Promox S.p.a.

Mauro Tenconi

Giuseppe Li Bassi

Giovanni Floridi

Ugo C Pfeiffer

Eva Baldaro

Luigi Merli

Pierangelo Pirovano

Valentina Langella

Angelo Casiraghi

Andrea Balestrini

Lorenzo Giardini

Barbara Biasotti

Roberto Macchi

Chiara Fumagalli

Laura Vigano

Enrico Cavo

Raffaella Pelizzari

Morano Gatto

Gabriele Minotti

Ugo Pfeiffer

Cristina Formantici

Dario Menabue

Michele Mazzi

Langella Valentina

Method of treating a portion of a subterranean formation comprising the injection of an aqueous fluid containing a modified polysaccharide bearing ethylenically unsaturated double bonds and an initiator of radical polymerization.

Method for treating subterranean formations

A glyoxal and boron free purified cationic polygalactomannan may be prepared by reacting a polygalactomannan flour, a nonionically derivatized polygalactomannan flour, or a mixture thereof, with a cationising reagent, adjusting the pH to be from about 4 to about 6; cross-linking the cationic with glyoxal, and filtering and water washing the cationic polygalactomannan to produce a glyoxalated purified cationic polygalactomannan containing not more than 70% by weight of water. In some cases it may be desirable to introduce a buffering agent to the glyoxalated purified cationic polygalactomannan to regulate the pH to from 8.0 to about 9.5, when measured at 1% (dry matter) in water. In other cases, it may be desirable to remove water to produce glyoxal free purified cationic polygalactomannan in powder form. Such compounds are particularly useful in personal care products.

Glyoxal free purified cationic polygalactomannan

Procedure for the preparation of cationic guar having DS comprised between 0.01 and 3, free from boron and suitable for the use in the cosmetic field and in household cleaning products, comprising the following steps: a) 100 parts by weight of guar flour are reacted with 3-chloro-2-hydroxypropyl trimethylammonium chloride and sodium hydroxide in from 5 to 500 parts by weight of a water and alcohol mixture containing from 20 to 50% by weight of water; b) the amount of water and alcohol is regulated in order to obtain a dispersion containing from 65 to 95% by weight of a of water and alcohol mixture containing from 30 to 50% by weight of water and the dispersion is maintained under stirring at temperature comprised between 15 and 40&#xb0; C. for at least 10 minutes; c) the mixture is filtered under vacuum and dried to obtain the purified cationic guar.

Procedure for the preparation of purified cationic guar

The present invention relates to hydrophobically modified hydroxyalkyl guar derivatives which dissolve rapidly in water, having a hydroxyalkyl molar substitution between 0.2 and 2.5 and containing hydrophobic groups comprising C10-C32 alkyl chains, to the procedure for their preparation and to their use in the formulation of well fluids.

Fast dissolving hydroxyalkyl guar derivatives

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Gazzada, Italy

Mauro Tenconi