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Microcapsules

A technology of microcapsules and gelation, applied in the direction of microcapsule preparation, microsphere preparation, coating detergent composition, etc.

Inactive Publication Date: 2007-07-04
THE PROCTER & GAMBLE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the design of microcapsules very technically challenging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] 380 g of sodium alginate from brown algae (Manucol DM from ISP - having a MG ratio of about 61 / 39, a GG fraction of about 0.21 and a molecular weight of about 0.0007 ag (448 KDa)) and 40 g of titanium dioxide (from Sigma Aldrich , product number T8141) was added to 9580 grams of deionized water and mixed to form a solution.

[0094] A throughput of 5.20 g / s of the above solution was pressurized through a 1.0 mm nozzle and cut at 356 rad / s (3400 rpm) using a rotary cutting tool (JetCutter, from GeniaLab) containing 24 200 micron thick wires. Speed ​​cutting to form spherical droplets between 1750 and 2250 microns in diameter. The droplets were dropped into a stirred hardening bath containing 75 liters of a 1% chitosan solution (Chitoclear from Primex) adjusted to pH 1.5 with HCl.

[0095] After a hardening time of 15 minutes, the microcapsules were separated from the chitosan solution by filtration, washed with copious amounts of water and stored in 1.0% NaCl solution. ...

Embodiment 2

[0097] The filtered microcapsules of Example 1 were stirred into a liquid laundry detergent prepared as described below. The microcapsules remain uniformly suspended in the liquid detergent.

Embodiment 3

[0099] Microcapsules of the formulation listed in Table A were prepared according to the following procedure: 80 g of polyvinyl alcohol ((PVA), Mowiol 3-83 from Clariant)) was added to 500 g of deionized water and stirred at 70°C to form a clear The solution. 7040 g (in the case of examples A1 and A2) and 6850 g (in the cases of examples A3 to A5) of deionized water were added to the solution to dilute the system.

[0100] Sodium alginate obtained from brown algae (340 grams of Manucol DM in the case of Examples A1 and A2, ex ISP, had a M:G ratio of about 61 / 39, a GG fraction of about 0.21 and a molecular weight of about 0.74 ag (448KDa); and in the case of Examples A3 and A5, 530 grams of Manucol DH from ISP with a M:G ratio of about 61 / 39, a GG fraction of about 0.18 and a molecular weight of about 0.48ag (289KDa )), 30 g of bactericide (ThorAcicide MBS), 10 g of titanium dioxide (from Sigma Aldrich, product number T8141 ) and aqueous polyvinyl alcohol were mixed to form a ...

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Abstract

Microcapsule for use in a liquid detergent composition, the microcapsule having a core and a polymeric polyanion-polycation complex shell wherein the polyanion component is capable of gelling in the presence of calcium and has a storage modulus when gelled with 0.05 moles / litre of calcium of less than about 150 Pa at an angular frequency of about 0.5 rad / s and a polyanion concentration of about 3.8 % by weight at 25 DEG C. The invention also relates to a process for making the microcapsules, liquid detergents comprising the microcapsules and cleaning methods using the liquid detergents.

Description

technical field [0001] The present invention belongs to the field of microcapsules, in particular it relates to microcapsules (having a core and a polymeric polyanion-polycation composite shell, wherein said polyanion is capable of forming a weak gel in the presence of calcium), their preparation, Liquid detergents (comprising microcapsules) and their use in laundry, dish cleaning and other applications. Background of the invention [0002] Liquid detergents containing microcapsules are very attractive to consumers. It is desirable to include microcapsules in liquid detergents not only for aesthetics but also for certain functions such as sequestration of incompatible ingredients, controlled and / or delayed release, etc. Ideally, the microcapsules are stably suspended in the liquid detergent and only dissolve / disintegrate upon application. This makes the design of microcapsules a great technical challenge. The conditions of the application can vary widely according to many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D17/00B01J13/02C11D3/22
CPCC11D17/0039C11D3/222C11D17/0013
Inventor W·F·J·范德维肯J·R·斯通豪斯W·A·M·布勒克斯J－P·布莱克A·L·麦康纳奇
Owner THE PROCTER & GAMBLE COMPANY
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