Rhone-Poulenc S.a.

Rhone-Poulenc Industries

Rhone-Poulenc Specialites Chimiques

Rhone-Poulenc Specialties Chimiques

Robert Pipon

Andre Henri Passedouet

Patrick Cros

Novel deacetylated polysaccharide biopolymers having improved viscosity/filtrability/injectability, well adopted for the secondary and tertiary recovery of oil deposits, are conveniently prepared by (i) acidifying an aqueous polysaccharide composition, e.g., a carbohydrate fermentation broth, with nitric acid to a pH of from about 2 to 0.1, (ii) heat-treating said acidified composition at a temperature of from about 50.degree. to 100.degree. C. for from about 5 to 60 minutes, and (iii) cooling said heat-treated composition and adjusting the pH thereof to a value of from about 5 to 7.

Acid/heat modified polysaccharide biopolymers

Aluminum salts of the formula: ##STR1## WHEREIN A IS AN INTEGER FROM 1 THROUGH 4, B IS AN INTEGER FROM 1 THROUGH 5 AND C IS AN INTEGER FROM 1 THROUGH 13, THE NUMBERS REPRESENTED BY THE INDICES A, B AND C BEING CONNECTED BY THE RELATIONSHIPS 3B = A + C AND THE RATIO B/A IS EQUAL TO OR GREATER THAN 1 AND LESS THAN OR EQUAL TO 2.5, ARE NEW COMPOUNDS POSSESSING PHARMACOLOGICAL, ANTI-PERSPIRANT AND DEODORANT PROPERTIES.

Aluminium salts of betaine chloride and compositions containing the same

Quaternary ammonium salts of the formula: ##STR1## in which R is alkyl of 7 to 16 carbon atoms and X.sup.- is a monovalent anion, have interesting germicidal properties, especially against Gram-negative bacteria.

Certain quaternary ammonium salts used to control gram-negative bacteria

New salts of the formula: ##EQU1## WHEREIN N REPRESENTS 3 OR 4, A REPRESENTS AN INTEGER FROM 1 THROUGH 10, B REPRESENTS ZERO OR AN INTEGER FROM 1 THROUGH 9, C REPRESENTS ZERO OR 1, AT LEAST ONE OF THE INDICES B AND C REPRESENTING AN INTEGER, AND D REPRESENTS ZERO OR AN INTEGER FROM 1 THROUGH 19, THE NUMBERS REPRESENTED BY THE INDICES A, B, C AND D BEING CONNECTED BY THE RELATIONSHIP A + D = 3 B + 2 C, POSSESS PHARMACOLOGICAL PROPERTIES, AND ARE PARTICULARLY USEFUL AS ANTI-ULCER AGENTS AND AS AGENTS FOR PROTECTING THE GASTRO-INTESTINAL MUCOUS MEMBRANE.

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Melle, France

Robert Pipon