WO2002013774A2 - Compositions de carbonate de calcium - Google Patents

Compositions de carbonate de calcium Download PDF

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Publication number
WO2002013774A2
WO2002013774A2 PCT/BR2001/000101 BR0100101W WO0213774A2 WO 2002013774 A2 WO2002013774 A2 WO 2002013774A2 BR 0100101 W BR0100101 W BR 0100101W WO 0213774 A2 WO0213774 A2 WO 0213774A2
Authority
WO
WIPO (PCT)
Prior art keywords
suspension
calcium carbonate
weight
aqueous
suspension according
Prior art date
Application number
PCT/BR2001/000101
Other languages
English (en)
Other versions
WO2002013774A8 (fr
WO2002013774A3 (fr
Inventor
Antonio O. Coelho
Carlos A. R. Valente
Gustavo P. N. Andrade
Luiz Ricardo B. S. Renha
Original Assignee
Química Industrial Barra Do Piraí Ltda.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Química Industrial Barra Do Piraí Ltda. filed Critical Química Industrial Barra Do Piraí Ltda.
Priority to EP01956221A priority Critical patent/EP1317244A2/fr
Priority to CA002414440A priority patent/CA2414440A1/fr
Priority to AU2001278314A priority patent/AU2001278314A1/en
Priority to BR0113336-5A priority patent/BR0113336A/pt
Publication of WO2002013774A2 publication Critical patent/WO2002013774A2/fr
Publication of WO2002013774A3 publication Critical patent/WO2002013774A3/fr
Publication of WO2002013774A8 publication Critical patent/WO2002013774A8/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A61K8/20—Halogens; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q11/00—Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses

Definitions

  • the present invention relates to calcium carbonate compositions, especially for use in the manufacture of toothpaste compositions.
  • calcium carbonate especially precipitated calcium carbonate (PCC) a chemically synthesized form of this product, is presently supplied to toothpaste industries as a dry powder.
  • PCC precipitated calcium carbonate
  • this product in this form causes a series of problems, such as: a) Emlubrious conditions at the production site, owing to the presence of large amounts of powder; b) the need to use paper bags to contain and store the powder; c) low productivity rates, owing to the time spent in the addition of powdered carbonate to other ingredients in the toothpaste manufacturing process; d) the need to keep a large storage ofthe product close to the toothpaste manufacturing plant; and e) extensive handling of the product during the processing stages, increasing the risk of causing microbiological contamination in the final product.
  • the purpose of the present invention is to provide a an aqueous slurry or suspension of calcium carbonate which is suitable for use in the toothpaste industry.
  • an aqueous suspension of particulate calcium carbonate for use in the manufacture of toothpaste compositions which includes, in addition to the calcium carbonate, one or more dispersing agents and/or one or more preservative agents and wherein the aqueous medium of the suspension has been treated so that the biological contamination of the suspension is not greater than the maximum allowable levels indicated by the US Food and Drugs Administration (FDA), for example standards set by Food and Chemical Codex and United States Pharmacopea.
  • FDA US Food and Drugs Administration
  • the suspension according to the invention may be a high solids suspension which is pumpable and flowable.
  • the solids content of the suspension may be 50% or more, in many cases 60% or more, e.g. up to 80% or more, by weight.
  • the viscosity may be 1000m Pa.s or less, e.g. 700mPa.s or less, especially from lOOmPa.s to 500mPa.s.
  • the suspension according to the invention meets these requirements as they are presently expressed, and which are incorporated here for the first time of a calcium carbonate suitable for use in toothpaste industry in aqueous suspension form has several benefits. The problems described earlier are reduced or avoided. In addition, since the toothpaste manufacturing process requires large amounts of water for the addition ofthe other components ofthe toothpaste composition, and the calcium carbonate can be easily delivered from a storage tank to the manufacturing site by pumping, the aqueous suspension form is well suited to the toothpaste manufacturing process.
  • the calcium carbonate employed in the suspension according to the invention may be a PCC although it could alternatively be a product processed from naturally occurring sources, generally by procedures involving grinding, i.e. a ground calcium carbonate or 'GCC.
  • the calcium carbonate may have an impurity content of not greater than 5%, preferably not greater than 3%, by weight.
  • the calcium carbonate, if a PCC may be prepared by any well known process. For example, PCC may be produced by carbonating an aqueous suspension of calcium hydroxide by addition of carbon dioxide.
  • the dispersing agent employed in the suspension according to one aspect of the invention may be any art recognized agent that is able to sufficiently disperse and reduce the viscosity of the suspension of calcium carbonate.
  • the dispersing agent comprises one or more inorganic or organic agents known in the art.
  • the dispersing agent comprises one or more sodium salts.
  • the agent may, for example, comprise one or more of: a condensed phosphate salt, such as sodium hexametaphosphate; a silicate, e.g. sodium silicate; and mixtures thereof.
  • the total amount of dispersing agent(s) employed may be from 0.1% to 6%, e.g. from 0.5% to 2%, by weight active based on the dry weight of calcium, carbonate.
  • a particularly suitable dispersing agent is a mixture of sodium silicate, 0.5% to 2.0%, preferably 0.8% to 1.2%, active by weight, and sodium hexametaphosphate, 0.1% to 0.7%, preferably 0.3% to 0.5%, active by weight, the weights being based on the dry weight of calci rn . carbonate.
  • the dispersing agent may alternatively or in addition comprise any surface-modifying agent which will disperse the PCC in the slurry, such ⁇ s surfactants or tensio-active agents.
  • the preservative agent employed in the suspension according to o ⁇ e aspect of the invention may be any substance known to inhibit microbiologies growth.
  • the agent to be used may be chosen from any preservatives known i n the art.
  • the preservative agent may comprise one or more of; an inorganic oxidizing preservative agent, such as sodium hypochlorite; a simple organic preservative agent, such as formaldehyde; or mixtures thereof.
  • the total amount of preservative agent present in the suspension may be at least 0.005%, e.g. from 0.01% to 0.20%, especially from 0.01% to 0.10%, active based on the total suspension weight.
  • the calcium carbonate when in PCC form may be prepared in any well known manner, for example by carbonation of lime, e.g. by reaction of gaseous carbon dioxide with slaked lime in an aqueous suspension.
  • the particles of the PCC may be in any form known in the art to be useful in toothpaste compositions.
  • the PCC particles may be in the rhombohedral or aragonite crystal form.
  • the aqueous suspension according to one aspect of the invention may be prepared as follows.
  • a starting suspension of particulate calcium carbonate e.g. a dilute PCC suspension formed following carbonation and neutralization having a solids content of not more than 40% by weight, e.g. from 10% to 30% by weight, is de watered using any art recognized method.
  • a press filter or similar equipment may be employed.
  • a solids content of at least 50% by weight is obtained through dewatering.
  • a cake may be produced.
  • the particles of the cake are then dispersed by addition of a dispersing agent.
  • mechanical agitation e.g. a high speed stirrer, is used to aid dispersion.
  • the dispersion may be carried out in a suitable vessel such as a dispersion vessel, a blender or dissolver.
  • the dispersing agent which may comprise one or more suitable dispersant compounds, may be added in an amount sufficient to reduce the viscosity of the suspension to an appropriate value as defined earlier, suitable for its use in the toothpaste formulation.
  • One or more preservative agents may be added to the suspension to control or inhibit the development of microbiological contaminants in the suspension.
  • a preservative agent such as sodium hypochlorite in the form of an aqueous solution is preferably employed as the preservative agent to be added to the suspension.
  • Water which has been treated by a process which inhibits microbiological growth may preferably be added to the suspension. The water may conveniently be that in which the dispersing agent or the preservative additive or preferably both is contained.
  • the treatment of the water to inhibit microbiological growth may be performed after the addition of the water to the calcium carbonate, so that the entire calcium carbonate suspension is treated.
  • the water may be treated by any known sterilization technique which will sufficiently reduce the microbiological activity level of the water.
  • the water may be treated using one or more of the following: known ultra high temperature treatments; sterilization; pasteurization; ozonation; or other processes known to reduce microbiological activity therein to an FDA accepted level.
  • the water is treated by ozonation.
  • the suspension product after addition of the dispersing agent and the preservative agent may be transferred to a storage tank.
  • the suspension is left in the storage tank for a time sufficient to allow the amount of ozone remaining in the suspension to drop to acceptable levels.
  • the suspension is left for at least forty eight hours in the storage tank to allow active ozone to be eliminated to the fullest extent possible.
  • the suspension may be delivered to a toothpaste manufacturing plant by pumping (if the plant is local), by transport on a vehicle such as a slurry tanker, or by any other transport method.
  • the suspension may, after treatment as described above, optionally be further treated in a known manner to give a further concentrated product. This may be carried out through further dewatering or drying, e.g. using a vacuum or press cleaner and/or a dryer. Following such treatment, a solids content of up to 99.5%o by weight may be obtained.
  • a method of producing an aqueous suspension of calcium carbonate as described above wherein a dispersing agent and a preservative agent are added to a suspension of calcium carbonate and then water which has been treated by a process to reduce microbiological activity therein is added to the suspension.
  • the dispersing agent and the preservative agent may be added to the suspension as a solution together with the treated water.
  • the dispersing agent, preservative agent, untreated water, and calcium carbonate may be combined and then treated by one of the methods disclosed above.
  • Example 50 tonnes of a (predominantly rhombohedral) PCC in an aqueous suspension having a 20% by weight solids content was prepared.
  • the PCC had a minimum CaC03 content of 98.0%>, i.e. not greater than 2% by weight of impurities, by weight and whiteness of 97%o.
  • the PCC suspension was filtered in a press filter, generating 14.285 tonnes of cake having a 70% solids concentration.
  • the cake was transported to a storage silo and afterwards transferred ready for addition to a dispersion vessel having a capacity of 2000 litres and fitted with a stirrer operating at a speed of 1500 rpm. 236 kg of an aqueous solution which had been pre-treated as described below was added to and mixed with 3,064.26 kg of the PCC cake in the vessel.
  • the solution added to the vessel contained as additives (i) sodium silicate in an active amount of 1.0%) based on the dry weight of PCC present; (ii) sodium hexametaphosphate in active amount of 0.4% by weight based on the dry weight of the PCC present and (iii) sodium hypochlorite preservative agent in an active amount of 0.015%) by weight based on the total suspension weight.
  • the base water employed to provide the solution containing the additives (i), (ii) and (iii) was previously ozonated for one hour, to achieve a solution meeting current international microbiological control standards. This pre-ozonated solution still contained active ozone when it was added to and mixed with the PCC cake.
  • the contents of the dispersion vessel were stirred for about one hour to ensure complete dispersion of the PCC. After that period, the obtained suspension had a viscosity of 250 mPa.s (measured by the well known o

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Birds (AREA)
  • Epidemiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Emergency Medicine (AREA)
  • Cosmetics (AREA)

Abstract

Une suspension aqueuse de carbonate de calcium particulaire utilisée dans la fabrication de compositions de dentifrice renferme, en sus du carbonate de calcium, au moins un agent de dispersion et au moins un conservateur. Le milieu aqueux de la suspension a été traité de manière à ce que la contamination biologique de la suspension n'est pas supérieure aux niveaux maximums autorisés indiqués par l'administration des aliments et des drogues des Etats-Unis (FDA). Le carbonate de calcium peut renfermer un carbonate de calcium moulu et/ou précipité. Ladite suspension peut aussi présenter un contenu de matières solides compris entre 50 % et 99,5 % en poids. Cette suspension peut être liquide ou pompable.
PCT/BR2001/000101 2000-08-17 2001-08-17 Compositions de carbonate de calcium WO2002013774A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP01956221A EP1317244A2 (fr) 2000-08-17 2001-08-17 Compositions de carbonate de calcium pour l'utilisation dans la preparation de dentifrice
CA002414440A CA2414440A1 (fr) 2000-08-17 2001-08-17 Compositions de carbonate de calcium
AU2001278314A AU2001278314A1 (en) 2000-08-17 2001-08-17 Calcium carbonate compositions for use in the manufacture of toothpaste
BR0113336-5A BR0113336A (pt) 2000-08-17 2001-08-17 Suspensão aquosa de carbonato de cálcio particulado para uso na fabricação de composições de pasta de dentes e métodos para produzir a mesma

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0020183A GB0020183D0 (en) 2000-08-17 2000-08-17 Calcium carbonate compositions
GB0020183.0 2000-08-17

Publications (3)

Publication Number Publication Date
WO2002013774A2 true WO2002013774A2 (fr) 2002-02-21
WO2002013774A3 WO2002013774A3 (fr) 2002-06-13
WO2002013774A8 WO2002013774A8 (fr) 2004-04-08

Family

ID=9897730

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2001/000101 WO2002013774A2 (fr) 2000-08-17 2001-08-17 Compositions de carbonate de calcium

Country Status (6)

Country Link
EP (1) EP1317244A2 (fr)
AU (1) AU2001278314A1 (fr)
BR (1) BR0113336A (fr)
CA (1) CA2414440A1 (fr)
GB (1) GB0020183D0 (fr)
WO (1) WO2002013774A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004087087A1 (fr) * 2003-04-04 2004-10-14 Unilever N.V. Procede pour la fabrication d'une composition orale
WO2006079911A1 (fr) * 2005-01-26 2006-08-03 Omya Development Ag Procede de controle de la contamination microbienne de suspensions ou dispersions aqueuses minerales, suspensions ou dispersions obtenues et leurs utilisations
EP3220742B1 (fr) 2014-12-01 2019-02-20 Colgate-Palmolive Company Utilisation d'ozone pour réguler la biocharge dans une boue aqueuse de carbonate de calcium précipité
DE102018008666A1 (de) * 2018-11-05 2020-05-07 Brillux Gmbh & Co. Kg Verfahren zur Konservierung einer Dispersion in einer Dosieranlage und Dosieranlage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562488A (en) * 1947-10-06 1951-07-31 Bactericidal Res Inc Germicidal reaction products of silver salts and monohydroxy-monoamino alkanes
US5716629A (en) * 1996-08-08 1998-02-10 Nalco Chemical Company Synergistic blend of 1-(3-chloroallyl)-3,5,7-triaza-1-azoniaadamantane tetrahydro-3,5,-dimethyl-2h-1,3,5-thiadiazine-2-thione
WO2000069401A1 (fr) * 1999-05-14 2000-11-23 Colgate-Palmolive Company Procede de fabrication d'une pate dentifrice

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562488A (en) * 1947-10-06 1951-07-31 Bactericidal Res Inc Germicidal reaction products of silver salts and monohydroxy-monoamino alkanes
US5716629A (en) * 1996-08-08 1998-02-10 Nalco Chemical Company Synergistic blend of 1-(3-chloroallyl)-3,5,7-triaza-1-azoniaadamantane tetrahydro-3,5,-dimethyl-2h-1,3,5-thiadiazine-2-thione
WO2000069401A1 (fr) * 1999-05-14 2000-11-23 Colgate-Palmolive Company Procede de fabrication d'une pate dentifrice

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Vidal 1997, 73ème édition" , EDITIONS DU VIDAL , PARIS, FR XP002188382 Column: "Rennie Liquide" page 1407 *
OMYA NORTH AMERICA: "Food & pharmaceutical products; Omya-Cal, FCC Food grade Calcium" INTERNET ARTICLE, [Online] XP002188381 Retrieved from the Internet: <URL:http://www.omya-na.com/foodpharma.htm > [retrieved on 2002-01-21] *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004087087A1 (fr) * 2003-04-04 2004-10-14 Unilever N.V. Procede pour la fabrication d'une composition orale
WO2006079911A1 (fr) * 2005-01-26 2006-08-03 Omya Development Ag Procede de controle de la contamination microbienne de suspensions ou dispersions aqueuses minerales, suspensions ou dispersions obtenues et leurs utilisations
US8877127B2 (en) 2005-01-26 2014-11-04 Omya International Ag Process for control of microbial contamination, mineral suspensions obtained and their uses
US8889068B2 (en) 2005-01-26 2014-11-18 Omya International Ag Method for controlling microbial contamination, mineral suspensions obtained and uses thereof
EP3220742B1 (fr) 2014-12-01 2019-02-20 Colgate-Palmolive Company Utilisation d'ozone pour réguler la biocharge dans une boue aqueuse de carbonate de calcium précipité
DE102018008666A1 (de) * 2018-11-05 2020-05-07 Brillux Gmbh & Co. Kg Verfahren zur Konservierung einer Dispersion in einer Dosieranlage und Dosieranlage

Also Published As

Publication number Publication date
CA2414440A1 (fr) 2002-02-21
EP1317244A2 (fr) 2003-06-11
BR0113336A (pt) 2004-02-17
AU2001278314A1 (en) 2002-02-25
WO2002013774A8 (fr) 2004-04-08
GB0020183D0 (en) 2000-10-04
WO2002013774A3 (fr) 2002-06-13

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