Patent GB-1069832-A (GB)
Title: Process for thickening aqueous media
Inventor: CHESNER LOUIS
IPC: D06L4/65
Filed: 1962-11-14
Abstract: A composition suitable for use in domestic washing comprises aqueous hydrogen peroxide having a pH of up to 6 and containing at least one stilbene derivative which increases its viscosity to at least 1.1 centipoises at 20 DEG  C. when measured by the Ostwald Viscometer. The stilbene derivative may be a compound having the formula <FORM:1069832/C1/1> in which R1 is an alkoxy or substituted alkoxy group, e.g. methoxy, ethoxy or b -hydroxy-ethoxy, and R2 is a substituted amino group in which the substituent is not itself halogen substituted, e.g. anilino alkyl anilino, ethylamine or isopropylamino.  The aqueous composition may contain 5.5-8% by weight of hydrogen peroxide calculated as 100% H2O2. The pH value of the composition may be adjusted by the addition of acetic acid.  The concentration of the stilbene derivative may be up to 17 g.p.l. although concentrations up to 50 g.p.l. or more may be used, if desired.  The composition may also contain an additional optical brightening agent substantive to synthetic fibres, e.g. 7-diethylamino-4-methyl cumarin, together, if necessary, with a solubilizer therefor, e.g. a moderately concentrated strong acid, a water-soluble monohydric alcohol, ester or ketone or a non-ionic or anionic surface-active agent, "Calsolene" oil HS (the word "Calsolene" is a Registered Trade Mark), the dioctylester of sulphosuccinic acid and ethoxylated sodium lauryl sulphate.  The use of a stilbene derivative which does cause thickening in combination with one or more others which do not, and with certain optical brightening agents which are not, stilbene derivatives results in a synergistic effect.  The compositions may be packaged in plastic squeeze bottles.ALSO:A composition suitable for use in domestic washing comprises aqueous hydrogen peroxide having a pH of up to 6 and containing at least one stilbene derivative which increases its viscosity to at least 1.1 centipoises at 20 DEG C when measured by the Ostwald Viscometer.  The stilbene derivative may be a compound having the formula <FORM:1069832/D1-D2/1> in which R1 is an alkoxy or substituted alkoxy group, e.g. p  methoxy ethoxy or b -hydroxy-ethoxy, and R2 is a substituted amino group in which the substituent is not itself halogen substituted e.g. anilino alkyl anilino, ethylamino or isopropylamino.  The aqueous composition may contain 5.5-8% by weight of hydrogen peroxide (calculated as 100% H2O2). The pH value of the composition may be adjusted by the addition of acetic acid.  The concentration of the stilbene derivative may be up to 17 g.p.l. although concentrations up to 50 g.p.l. or more may be used if desired.  The composition may also contain an additional optical brightening agent substantive to synthetic fibres, e.g. 7-diethylamino-4-methyl cumarin, together, if necessary, with a solubiliser therefor, e.g. a moderately concentrated strong acid, a water soluble monohydric alcohol, ester or ketone or a non-ionic or amionic surface active agent, Calsolene oil HS (the word "Calsolene" is a Registered Trade Mark), the dioctylester of sulphosuccinic acid and ethoxylated sodium lauryl sulphate.  The use of a stilbene derivative which does cause thickening in combination with one or more others which do not, and with certain optical brightening agents which are not, stilbene derivatives results in a synergistic effect.  The compositions may be packaged in plastic squeeze bottles.