IL40522A - Dental care and cleansing agent - Google Patents

Description

Dental care and cleansing agent The invention relates to a dental care and cleansing agent in the form of a paste-like suspension in glycerine or substitutes therefor. The solid phase contains abrasive agents, polishing substances and/or thickening agents based on synthetic finegrained silica obtained either by precipitation or pyrogenously ; and the liquid phase contains binding agents, foaming agents, wetting agents, flavouring agents, lubricants, colouring matter and special oral-cosmetic additives, said dental care and cleansing agent preferably having high transparency and smoothness, with sufficient abrasiveness.

The modern production of dental care agents aims at preventing all possible damage to the tooth enamel and the gums, while nevertheless retaining great cleansing power. To attain this object, numerous treatment processes and agents have been developed, which either substitute soaps or salts for the abrasive agents or endeavour to reduce the abrasive effect of the abrasive agents by means of increased additions of thickening agents, such as for example, the addition of colloidal kaolin, silica gel and highly dispersed silica produced pyrogenously.

The use of pyrogenous highly-dispersed silica is known in the production of toothpastes and has proved advantageous as a thickening agent. On account of its extraordinary particle fineness and its large specific surface, the pyrogenous silica shows substantial binding properties in toothpastes. It can therefore be used as an additional binding agent together with carboxy-methyl-cellulose, other tvater-soluble cellulose ψ derivatives or tragacanth.

The reduction in the abrasiveness obtained with the use of these thickening agents has, however, the disadvantage that the desired cleansing effect is not always guaranteed, in that loosely bound food particles are removed, but harder segregations, for example lime and the discolourations resulting therefrom remain adherent.

British Patent Specification No. 1,045,058 describes a dentifrice formulation containing aluminium silicate as abrasive agent. The aluminium silicate prepared as in the British specification is very hard and, in order to avoid scratching of the teeth, is used in admixture with sodium metaphosphate.

According to Israel Patent Specification No. 6825 kaoline is used as the abrasive agent. Since it is very soft, large \ amounts of kaoline have to be incorporated into the dentifrice < in order to show a satisfactory abrasive effect.

I The invention is based on the aim of developing dental care and cleansing agent in the form of a paste-like suspension in glycerine or substitutes therefor, the solid phase containing abrasive agents (A), polishing substances (B) and/or thickening agents (C) based on fine-grained silica, obtained by precipitation or pyrogenously; and the liquid phase containing binding agents, foaming agents, wetting agents, flavouring agents, lubricants, colouring matter and special oral-cosmetic additives, said dental care and cleansing agent having a sufficient abrasiveness and preferably high .transparency with good smoothness and dental care ro erties wherein the addition of abrasive a ents havin The invention is characterised in that the dental care and cleansing agent contains as abrasive agent (A) fine-grained aluminium silicates together with the polishing substances (B and or the thickening agents (C).

The proportion of the solid matter (ABC), based on the paste, It) to O parts by weight, wherein Λ = 7 to 38 parts by weight preferably 10 to 20 parts by weight, B = O to 8 parts by weight, preferably 0 to 6,5 parts by weight, and C = 0 to 7 parts by weight, preferably 2 to 5 parts by weight.

Polishing and abrasive substances are known generically under the expression "polishing agents", and, according to the size and nature of the particles thereof, either a polishing effect or an abrasive effect is respectively produced thereby: CaHPO^, CaCO^, Al (OH)^, CaHPO^ . 2 H^O are recorded as more or less strong abrasive agents, on account of their structure and particle size, as these can result in abrasion values of up to 0 rag Cu in toothpastes. Such abrasiveness is, however, too high, as the values which have proved appropriate in practice are 5 to 25 mg Cu. Pyrogenous silica and precipitated finegrained silica have an amorphous and spherical shape and possess little or no abrasiveness, and are therefore referred to as polishing agents in the true sense.

The said difference between polishing substances (B) and abrasive agents (A) thus means that both fine-grained substances ;vithout abrasiveness are present in a toothpaste as polishing substances (B), together with abrasive agents (A) having abrasiveness.

According to the invention precipitated silica can be used as a polishing substance (B), while fine-grained pyrogenously obtained pure silica is present as thickening agent (C).

Surprisingly it xvas found that by using both aluminium silicates and synthetic fine-grained silica, satisfactory abrasion values in the region of 2 to mg/Cu can be obtained, although the aluminium silicates used according to the invention are not of a - - coarse grained quality, but are in grain fineness hardly inferior to highly-dispersed silica.

As abrasive agent (A) , use is made of an aluminium silicate (A2) having ΑΙ,Ο, = 8,6 %, sio2= 71,1 %, a BET surface (determined according to iranauer, Emmet and Teller, J.A.C.S.60, p. /even of 300 - 25 m /g, a primary particle size in the region of 5 - 15 nra," and a secondary particle size in the region of lO to 30 im; and/or an aluminium silicate (A^) having A^O^ = 7,74 to 8,55 %t Si02 = 68,71 - 71,72 % a BET surface of 120 ΐ 25 m2/g, and a secondary particle size in the region of 2 to 20 ura By combining A^ with in the presence of pyrogenously obtained silica, abrasiveness can be regulated exactly, in that when to about 10 parts by weight A and 5 parts by weight SiO , 0 to 0,5 parts by weight are added, an increase in abrasiveness of between about 2 rag Cu to about 30 mg Cu is attained (cf. graph).

As polishing substance (B), a fine-grained wet-precipitated silica is used, having a BET surface area of 200 to 300 ÷ 25 m 2/g, primary particle size in the region of 5 to 20 nm, and an average secondary particle size of and as thickening agent (C) , a fine-grained pyrogenously obtained silica is used, having a BET surface area in the region of 150 to 380 + 25 m /g and a primary particle size of in the region of 7 to l6 nm.

To obtain a high transparency in the paste, organic solvents having an index of refraction in the region of 1,4 to 1,6, in particular chloroform, bromoform or benzo-acetic ester, are. added to the mixture in quantities in the region of 0,5 to 2,0 » by weight, calculated on a basis of the weight of the total mixture.

Several suitable corapositions of the agent according to the invention are given in the following examples: 0,5 % binding agent CMC (Carboxymethylcellulose) 20,5 % water pH value: 7,90 5,0 % Aerosil 200 V (pyrogenously obtained silica) 60,0% sorbitol 11,0 % aluminium- silicate abrasion: 2,4 ™g Cu 2,0 % Texapon K 12 Blue food colouring agent No. 3 1,0 % aroma oil DR 0/3751 consistency: very goo 0,5 % binding agent CMC 19,2 % water pH value: 7»60 6,3 % Aerosil 200 V 30,0 % glycerine 30,0 % sorbitol 70% 11,0 % aluminium-silicate A^ abrasion: 2,5 m Cu 2,0 % Texapon K 12 Blue food colouring agent No. 1,0 % aroma oil DR 0/3751 consistency: good 0,5 % binding agent CMC 17,5 water pH value: 7» 0 8,0 % sident 3 30,0 % glycerine 11,0 % aluminium- silicate ΑΊ abrasion: 3,2 g Cu 30.0 % sorbitol 70% 2,QSTexapon K 12 Blue food colouring agent No 1,0 % aroma oil DR 0/3751 consistency: very goo 0,5 % binding agent CMC 7,2 % water pH value: 7> 0 6,3 sident 7 0,0 % glycerine 0,0 % sorbitol 70% 3,0 % aluminium-silicate abrasion: 3,5 mg Cu 2,0 % Texapon K 12 Blue food colouring agent No. 3 I, 0 % aroma oil DR O/375I consistency: soft 0,5 % binding agent CMC 9,2 % water pH value: 7,20 2,0 % Aerosil 200 ,3 % Sident 7 0,0 % glycerine 1,0 % aluminium silicate abrasion: 2,8 mg Cu ,0 % sorbitol ,0%texapon K 12 Blue food colouring agent No. 3 1,0 % aroma oil DR 0/3751 consistency: very good ,5 % binding agent CMC , % water pH value: 8,0 ,0 % aerosil 200 V ,C¾glycerine 5,0 % sorbitol I, 0 % aluminium-silicate A^ abrasion: 8,0 ng Cu 0,1 % aluminium-silicate 2,0 % texapon K 12 Blue food colouring agent No. 3· 1,0 % aroma oil DR 0/3751 consistency: very good 7Ϊ ,5 % binding agent CMC 10,1 % water pH value: 8,1 5,0 % aerosil 200 V 35, O % glycerine 35, O % sorbitol 11, O % aluminium-silicate A1 abrasion: 23,2 g Cu 0,4 % aluminium-silicate 2,0 % texapon K 12 Blue food colouring agent No. 3 1,0 % aroma oil D 0/3751 consistency: very good 8). 0,5 % binding agent CMC 10,0 % water pH value: 7,5 3,0 % aerosil 63,3% glycerine 20, O % aluminium-silicate A^ abrasion: 13 mg Cu 0,2 % aluminium-silicate 2,0 % texapon K 12 Blue food colouring agent No. 3 1,0 % aroma oil DR 0/3751 consistency: good The production of the agent according to the invention and according to the recipes 1 - 8 can be effected advantageously in the manner described hereinafter: ' The binding agent (preferably cai'boxymethylcellulose) is soaked with the calculated amount of water. An antiseptic, for exam le- · oxybenzoic-acid-methyl (or ethyl )-ester , is preferably added to this slime. After the soaking process has ended, the wetting agent (glycerine, sorbitol, propylene-glycol or polyethylene- glycol) is added with agitation. Subsequently, the silica is added and stirred until the mass has a smooth, uniform appearance. Thereafter, the weighed quantities of aluminium- silicates are worked in and stirred vigourously. Finally the addition of the foaming substance and the aroma oil is effected under very slight agitation. Further homogenization, the still fluid toothpaste mass can be allowed to run over a three- roller frame, which, however, is not absolutely necessary. - o -

Claims (10)

40522/2 .0 Having now particularly described and ascertained our said invention and in what manner the same is to. be performed, we declare that what we claim is:

1. A dental care and cleansing agent in the form of a suspension or paste in' glycerine or substitutes therefor, the solid phase containing abrasive agents (A), polishing substances (B) and/or thickening agents (C) , based on fine-grained silica obtained either by precipitation or pyrogenously ; and the liquid phase containing binding agents, foaming and wetting agents, flavouring agents, colouring matter and special oral-cosmetic additives, characterized in that as abrasive agent (A) , it contains an aluminium silcate (A2) having Al203 = 8,6 %, Si02 = 71 ,1 %, 2 a BET surface of 300 + 25 m /g, a primary particle size in the region of 5 to 15 nm and a secondary particle size in the region of 10 to 30 ^um and/or an aluminium silicate (A1) having Al203 = 7,74 to 8,55%, Si02 = 68,71 to 71,72%, + 2 a BET surface of 120 25 m /g, and a secondary particle size in the region of 2 to 20 ^im together with the polishing substance (B) and/or the thickening agent (C) .

2. A dental care and cleansing agent according to claim 1, characterised in that the proportion of the solid matter (ABC), based on the total paste, is 10 to l 0 parts by weight, wherein A = 7 to 38 parts by weight, B = O to parts by weight, and C = O to 7 parts by weight.

3. A dental care and cleansing agent according to claim 2, wherein A = 10 to 20 parts by weight, B = O to 6,5 parts by weight, and C = 2 to 5 parts by weight. 40522/3

4. A dental care and- cleansing agent according to any one of claims 1 to 3, characterised in that as polishing substance (B), a fine-grained wet-precipitated silica having a BET surface of 2 2O0 to 300 + 2:5 M /g, a primary particle size in the region of 5 to 20 nm, and an average secondary particle size of 4 is present.

5. A dental care and cleansing agent according to any one of claims 1 to 3, characterized in that as thickening agent (C) , a fine-grained, pyrogenously obtained silica having a EET surface in the region of 150 to 380 + 25 m /g and a primary particle size in the region of 7 to 16 nm is present.

6. A dental care and cleansing agent according to any one of claims 1 to 5 characterised in that together with a quantity of 11 % by weight of the components (A^) and a quantity of 5 by weight of the components (C) , the components (Ag) are present in -quantity -in the region of 0,-1 to 0, 5 -by wei-ght , all -calculat on a basis of the weight of the total mixture.

7. A transparent dental care and cleansing agent according to any one of claims 1 to 6, characterised in that it contains an organic solvent having an. index of refraction in the region of 40522/3 1,4 to 1,6 in a quantity in the range of 0.5 to 2.0% by weight.

8. A transparent dental care and cleansing agent according to claim 7, in which the organic solvent comprises chloroform, bromoforro or benaolacetlc ester.

9. A dental care agent as claimed in claim 1 substantially as described herein.

10. A dental care agent substantially as described herein with reference to any one of the examples.