Polynuclear microcapsules

• US 8,435,560 B2
• Filed: 12/21/2007
• Issued: 05/07/2013
• Est. Priority Date: 12/28/2006
• Status: Active Grant

• Current Assignee: Dow Silicones Corporation (Dow, Inc.)
• Original Assignee: Dow, Inc.
• Inventors: Marteaux, Leon Andre, Zimmerman, Brett Lee
• Primary Examiner(s): DICKINSON, PAUL W
• Application Number:
  US12/519,403
• Publication Number:
  US 20100172999A1
• Time in Patent Office: 1,964 Days
• Field of Search: None
• US Class Current: 424/455
• CPC Class Codes: A45C 11/00 Receptacles for purposes not provided for in groups A45C1/00-A45C9/00 specially adapted for toiletry or cosmetic equipment A45D29/20, A45D44/18; travelling sewing kits A45F3/48
• CPC Class Codes: A45C 13/26 Special adaptations of handles A45C13/22 takes precedence
• CPC Class Codes: A45C 2011/001 for portable audio devices, e.g. headphones or MP3-players
• CPC Class Codes: A45C 2011/003 for portable computing devices, e.g. laptop, tablet, netbook, game boy, navigation system, calculator
• CPC Class Codes: A45F 2005/026 with a pin having an enlarged head detachably connected to a fastening device, e.g. to a pin receiving slot
• CPC Class Codes: A45F 2200/0508 Portable audio devices, e.g. walkman, discman, radio, MP3 player, headphones
• CPC Class Codes: A45F 2200/0516 Portable handheld communication devices, e.g. mobile phone, pager, beeper, PDA, smart phone
• CPC Class Codes: A45F 5/02 Fastening articles to the garment
• CPC Class Codes: A45F 5/021 to the belt
• CPC Class Codes: A61K 9/501 Inorganic compounds
• CPC Class Codes: A61K 9/5089 Processes
• CPC Class Codes: Y10S 224/93 Attached to animate bearer

Abstract

A process is disclosed for preparing polynuclear microcapsules by polymerizing an alkoxysilane at the oil/water interface of a multiple phase emulsion to form a suspension of polynuclear microcapsules. Also disclosed are polynuclear micro-capsules optionally comprising a hydrophilic active and uses thereof.

Claims

1. A process for preparing a suspension of polynuclear microcapsules, said polynuclear microcapsules comprising an outer-capsule wherein the outer-capsule comprises an outer-shell and a plurality of inner-capsules, and wherein each of the inner-capsules comprises an inner-shell and an aqueous phase core, and wherein the outer-shell and the inner-shell further comprise a silica or an organofunctional silica, comprising the following steps:

I) mixing

A) a first emulsifier comprising a silicone polyether having the formula I or II;

2. The process of claim 1 further comprising the step of recovering the polynuclear microcapsules from the suspension.

3. The process of claim 1 wherein the alkoxysilane is tetraalkoxysilane.

4. The process of claim 1 wherein the second emulsifier is a cationic surfactant, a non-ionic surfactant, amphoteric surfactant, or any combination the surfactants.

5. The process of claim 1 wherein the second emulsifier is a polymeric surfactant or particle.

6. The process of claim 5 wherein the polymeric surfactant is an ethylene glycol propylene glycol copolymer.

7. The process of claim 5 wherein the particle is fumed silica, colloidal silica or synthetic clay.

8. The process of claim 1 wherein the weight percent of components A, B and C in step I range from;

A) 0.1 to 30 weight percent,

B) 1 to 99 weight percent,

C) 1 to 99 weight percent.

9. The process of claim 8 wherein the weight percent of component D ranges from 0.1 to 20 weight percent in the multiple phase emulsion of step II.

10. The process of claim 1 wherein x is 396, y is 4, a is 3, b is 18, c is 18 and d is 18.