# US 7,745,386 B2 · Process of incorporating microcapsules into dryer-added fabric care articles

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- Number: US 7,745,386 B2
- Document ID: US7745386B2
- Status: Granted
- Kind: B2
- Application number: 12/613,823
- Filed: 2009-11-06
- Published: 2010-02-25
- Granted: 2010-06-29
- Earliest claimed: 2006-05-24
- Assignees: The Procter & Gamble Company
- Inventors: Darren Franklin King; Komal G. Patel; George Kavin Morgan, III; Glenn Thomas Jordan, IV
- Web page: https://patentgrep.com/patent/US7745386B2

## CPC

- C11D 3/505: {encapsulated or adsorbed on a carrier, e.g. zeolite or clay}
- C11D 3/507: {Compounds releasing perfumes by thermal or chemical activation}
- C11D 17/047: {Arrangements specially adapted for dry cleaning or laundry dryer related applications}
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## Abstract

Dryer-added fabric conditioning articles that comprise friable perfume microcapsules provide consumers an impactful freshness experience while wearing clothing that is treated by the article. Manufacturing processes of incorporating friable perfume microcapsules into dryer-added articles that maximizes the yield of unruptured microcapsules are provided.

## Claims

### Claim 1

A method of making a dryer-added fabric conditioning, friable perfume microcapsule containing, dryer sheet comprising the steps:
(a) containing a coat mix in a coat mix tank, wherein the coat mix comprises a fabric conditioning active;
(b) applying the coat mix from the coat mix tank to a non-woven substrate to make a fabric conditioning dryer sheet;
(c) containing a microcapsule slurry at a temperature from about 50° C. to about 125° C. in a microcapsule slurry tank;
wherein the microcapsule slurry comprises a friable perfume microcapsule, and
wherein the friable perfume microcapsule encapsulates a perfume composition; and
wherein the microcapsule slurry comprises from about 20% to about 75% water, by weight of the microcapsule slurry; and
(d) applying the microcapsule slurry from the microcapsule slurry tank to the fabric conditioning dryer sheet to make the dryer-added fabric conditioning, friable microcapsule containing, dryer sheet.

### Claim 2 (depends on 1)

The method of claim 1, wherein the temperature of the microcapsule slurry, before the slurry is applied to the fabric conditioning dryer sheet, comprises a temperature from about 60° C. to about 95° C.

### Claim 3 (depends on 2)

The method of claim 2, wherein the microcapsule slurry comprises from about 20% to about 60% water, by weight of the slurry.

### Claim 4 (depends on 3)

The method of claim 3, wherein the coat mix, contained in the coat mix tank, further comprises:
(a) from about 95% to about 100% of the fabric conditioning active by weight of the coat mix;
(b) from about 0% to about 5% of water by weight of the coat mix; and
(c) is substantially free of friable perfume microcapsules.

### Claim 5 (depends on 4)

The method of claim 4, wherein the friable perfume microcapsule comprises a shell capsule, wherein the shell capsule comprises an aminoplast resin.

### Claim 6 (depends on 5)

The method of claim 5, wherein the step of applying the microcapsule slurry from the microcapsule slurry tank to the fabric conditioning dryer sheet comprises using an impregnation head.