Clear dentrifrice gels

A - Human Necessities – 61 – K

Patent

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Details

A61K 8/46 (2006.01) A61K 8/24 (2006.01) A61K 8/25 (2006.01) A61Q 11/00 (2006.01)

Patent

CA 2334623

According to the present invention there is provided a visually clear, dentrifice gel comprising; a) sufficient tetrasodium pyrophosphate to provide from 0.2 % to 5 % pyrophosphate anion; b) a silica dental abrasive having a refractive index of from 1.445 to 1.47; c) from 0.7 % to 3 % sodium alkyl sulphate; and d) an aqueous liquid carrier. The gel has excellent clarity, high anticalculus efficiency and good foaming. According to a further aspect of the invention there is provided a process for making a clear dentifrice gel comprising the step of adding anhydrous tetrasodium pyrophosphate to an aqueous carrier, the gel comprising: a) a silica dental abrasive having a refractive index of from 1.445 to 1.47; and b) an aqueous liquid carrier comprising less than 27 % total water. The use of anhydrous tetrasodium pyrophosphate allows greater formulation flexibility at the processing stage by freeing up water for the dissolution and/or hydration of other dentrifice components.

La présente invention se rapporte à un gel dentifrice d'apparence transparente comportant (a) suffisamment de pyrophosphate de tétrasodium pour produire 0,2 % à 5 % d'anion pyrophosphate; (b) un abrasif dentaire à base de silice doté d'un indice de réfraction compris entre 1,445 et 1,47; (c) de 0,7 % à 3 % d'alkylsulfate de sodium et (d) un excipient liquide aqueux. Ce gel présente une excellente transparence, une haute efficacité anti-tartre et une bonne aptitude au moussage. Selon un autre de ses aspects, cette invention concerne un procédé de fabrication d'un gel dentifrice transparent, consistant à ajouter du pyrophosphate de tétrasodium anhydre à un excipient aqueux, ledit gel comportant (a) un abrasif dentaire à base de silice doté d'un indice de réfraction compris entre 1,445 et 1,47 et (b) un excipient liquide aqueux contenant moins de 27 % d'eau au total. L'utilisation du pyrophosphate de tétrasodium permet une plus grande souplesse de formulation au cours de l'étape de traitement du fait qu'il libère l'eau pour la dissolution et/ou l'hydratation des autres composants du dentifrice.

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