Dissolvable bleach sheet

• US 4,532,063 A
• Filed: 08/15/1983
• Issued: 07/30/1985
• Est. Priority Date: 08/15/1983
• Status: Expired due to Fees

• Current Assignee: SC Johnson & Son Incorporated
• Original Assignee: SC Johnson & Son Incorporated
• Inventors: Gueldenzopf, Thomas D.
• Primary Examiner(s): Lieberman, Paul
• Assistant Examiner(s): Le, Hoa Van
• Application Number:
  US06/523,316
• Time in Patent Office: 715 Days
• Field of Search: 252/174.13, 252/174.17, 252/186.2, 252/186.25, 252/186.27, 252/186.34, 252/186.35, 252/90, 252/91, 252/92, 252/134, 252/174, 252/DIG. 2 , 252/DIG. 3, 252/DIG. 16, 252/DIG. 15
• US Class Current: 252/186.35
• CPC Class Codes: C11D 17/044 Solid compositions
• CPC Class Codes: C11D 17/06 Powder; Flakes; Free-flowing mixtures; Sheets
• CPC Class Codes: C11D 3/225 etherified, e.g. CMC
• CPC Class Codes: C11D 3/3942 Inorganic per-compounds C11D3/3902 takes precedence
• CPC Class Codes: C11D 3/3955 Organic bleaching agents C11D3/3951 takes precedence

Abstract

A dissolvable bleach sheet composition comprising a bleaching compound, a water-soluble film forming polymer, a solubilizer and a surfactant.

Claims

1. A storage stable laundry bleach sheet soluble in water and containing a composition comprising a dry particulate bleaching compound selected from the group consisting of sodium dichloroisocyanurate dihydrate, sodium dichloroisocyanurate, potassium dichloroisocyanurate dihydrate, potassium dichloroisocyanurate, sodium perborate monohydrate, sodium perborate tetrahydrate and sodium percarbonate and mixtures thereof;

a bleach stable film-forming water-soluble hydroxypropyl cellulose polymer having at least 2.5 moles of propylene oxide per anhydroglucose unit and having a molecular weight of less than 1,000,000;

a solubilizer selected from the group consisting of sodium carbonate, sodium phosphate, sodium bicarbonate, sodium pyrophosphate, sodium tripolyphosphate, sodium borate, sodium citrate, sodium silicate, sodium hydroxide, sodium sulfate, zeolite and mixtures thereof and a bleach-stable surfactant wherein the weight ratio of bleaching compound to polymer is within the range from 10;

1 to 1;

2;

the weight ratio of solubilizer to polymer is within the range from 3;

1 to 1;

20 and the weight ratio of surfactant to polymer is within the range of from 1;

1 to 1;

20 and wherein the bleach sheet contains from 2 to 20 grams of bleaching compound.

2. The bleach sheet of claim 1 wherein the bleaching composition is sodium dichloroisocyanurate dihydrate.

3. The bleach sheet of claim 1 wherein the the ratio of bleaching composition to polymer is within the range of from about 5:

1 to 1;

1.

4. The bleach sheet of claim 1 wherein the ratio of bleaching composition to polymer is within the range of from about 3:

1 to 2;

1.

5. The bleach sheet of claim 1 wherein the ratio of solubilizer to polymer is within the range of 1:

10 to 1;

2.

6. The bleach sheet of claim 1 wherein the ratio of solubilizer to polymer is within the range of from 1:

4 to 1;

2.

7. The bleach sheet of claim 1 wherein the ratio of surfactant to polymer is within the range of from 1:

10 to 1;

2.

8. The bleach sheet of claim 1 wherein the ratio of surfactant to polymer is within the range of from 1:

6 to 1;

2.

9. The bleach sheet of claim 1 wherein the surfactant is selected from the group consisting of sodium laurylsulfate, sodium dioctylsulfosuccinate, linear alkyl benzene sulfonate, alpha olefin sulfonate, xylene sulfonate and mixtures thereof.