# US 4,395,261 A · Vapor hydrogen peroxide bleach delivery

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- Number: US 4,395,261 A
- Document ID: US4395261A
- Status: Granted
- Kind: A
- Application number: 06/339,197
- Filed: 1982-01-13
- Granted: 1983-07-26
- Earliest claimed: 1982-01-13
- Assignees: FMC Corporation
- Inventors: Charles W. Lutz
- Web page: https://patentgrep.com/patent/US4395261A

## CPC

- C11D 17/047: {Arrangements specially adapted for dry cleaning or laundry dryer related applications}
- C11D 3/3942: {Inorganic per-compounds (C11D3/3902 takes precedence)}
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## Abstract

The invention relates to the dispensing of hydrogen peroxide into a clothes dryer. The aqueous hydrogen peroxide is placed into a container with a microporous, hydrophobic surface which is heated whereby the hydrogen peroxide is vaporized and delivered to the interior of the dryer where it is available to bleach textiles.

## Claims

### Claim 1

A method for bleaching damp textiles while they are exposed to heated gases in a clothes dryer by means of hydrogen peroxide initially confined as a liquid by the inner surface of a wall of a container, at least part of said wall being a microporous, hydrophobic membrane having an effective pore size of approximately 0.01 .mu.m to 0.4 .mu.m in size with the exterior surface thereof accessible to the heated gases of the dryer whereby said liquid hydrogen peroxide is vaporized by the heat of said gases and delivered as a vapor through said membrane into the heated gases of the dryer primarily at a time when the textiles to be bleached are still damp, yet near the end of the drying cycle when the temperature within the dryer is the highest.

### Claim 2 (depends on 1)

The method of claim 1, wherein the container is a pouch formed from said surface, and said microporous membrane is a polypropylene film.

### Claim 3 (depends on 2)

The method of claim 2, wherein the said surface consists of said membrane laminated to at least one polypropylene non-woven web and said pores are 0.02.times.0.2 .mu.m in size.

### Claim 4 (depends on 1)

The method of claim 1, wherein the hydrogen peroxide concentration is between 3% and 30%.

### Claim 5 (depends on 1)

The method of claim 1, wherein the hydrogen peroxide concentration is between 3% and 10%.

### Claim 6

A package for insertion into a clothes dryer comprising a wall defining the outer surface of a closed container, the inner surfaces of said wall confining a liquid, aqueous solution of 3% to 10% hydrogen peroxide, at least part of said wall being a hydrophobic, vapor-permeable membrane having an effective pore size of approximately 0.01 .mu.m to 0.4 .mu.m in size.