Polymer sheet for delivering laundry care additive and laundry care product formed from same

• US 4,797,221 A
• Filed: 05/09/1988
• Issued: 01/10/1989
• Est. Priority Date: 09/12/1985
• Status: Expired due to Term

• Current Assignee: SC Johnson & Son Incorporated
• Original Assignee: SC Johnson & Son Incorporated
• Inventors: Gueldenzopf, Thomas D.
• Primary Examiner(s): Clingman, A. Lionel
• Application Number:
  US07/193,205
• Time in Patent Office: 246 Days
• Field of Search: 252/90, 252/91, 252/95, 252/186.25, 252/186.34, 252/186.35, 252/186.36, 252/186.37
• US Class Current: 252/186.2
• CPC Class Codes: C11D 17/044 Solid compositions
• CPC Class Codes: C11D 17/046 Insoluble free body dispenser
• CPC Class Codes: C11D 3/395 Bleaching agents

Abstract

An addition polymer of a water-insoluble soft monomer, a water-soluble anionic monomer and, optionally, a water-soluble nonionic monomer and water-insoluble hard monomer is neutralized up to 100%, and formed into a sheet. A laundry care additive, as a bleach, may be stored between a pair of opposed heat sealed sheets to provide a laundry care product adapted to be introduced into a laundry wash.

Claims

1. A water-soluble sheet for delivering laundry care additives containing bleaches, which sheet comprises a self-supporting water-soluble film of an addition polymer formed of:

(a) from about 0 to 85% by weight of a water-insoluble soft monomer;

(b) from about 15 to 60% by weight of a water-soluble anionic monomer;

(c) from about 0 to 25% by weight of a water-soluble nonionic monomer; and

(d) from about 0 to 40% by weight of a water-insoluble hard monomer,

wherein said addition polymer is up to about 100% neutralized with a Group IA metal base or a Group IA metal basic salt.

2. The sheet of claim 1 in which the addition polymer is a polymer of from about 40-85% by weight of said water-insoluble soft monomer, from about 15 to 60% by weight of said water-soluble anionic monomer and from about 0 to 15% by weight of said water-soluble nonionic monomer and is neutralized up to about 100%.

3. The sheet of claim 1 in which the water-insoluble soft monomer is a C₁ to C₈ alkyl acrylate or a C₅ to C₁₈ alkyl methacrylate.

4. The sheet of claim 1 in which the anionic monomer is selected from the group consisting of methacrylic acid and acrylic acid.

5. The sheet of claim 2 in which the nonionic monomer is selected from hydroxyalkyl acrylates or methacrylates having an alkyl group with from 2-6 carbon atoms to which the hydroxy group is attached.

6. A laundry care product which comprises at least one wafer of bleaching agent carried by the sheet of claim 1.

7. A laundry care product which comprises particles of bleaching agent carried by the sheet of claim 1.

8. A laundry care product which comprises a substantially uniform layer of dispersed particles of bleaching agent contained within a unit formed from the sheet of claim 1.

9. A laundry care product which comprises a substantially uniform layer of dispersed wafers of bleaching agent contained within a unit formed from the sheet of claim 1.

10. A laundry care product comprising a pair of sheets of the film of claim 1 which contain said bleaching agent.

11. The product of claim 10 in which an outer surface of each sheet contains a moisture barrier coating thereon, whereby said laundry care product is provided with enhanced humidity resistance.

12. The product of claim 10 in which the laundry care additive is a dry bleaching agent selected from the group consisting of alkali metal and alkaline earth metal hypochlorites, hypochlorite addition products, dimethyldihalohydantoin, chlorinated isocyanurates, chloramines, chlorimines, chloramides and chlorimides.

13. The product of claim 12 in which the weight ratio of said bleach to said polymer is from about 10:

1 to 1;

2.

14. Process for forming a water-soluble laundry care product which comprises:

(a) forming a unit by surrounding a substnatially uniform layer of dispersed wafers or particles of bleaching agent with at least one sheet according to claim 1; and

(b) sealing said unit in such a manner that all sheets present in said unit completely surround and contain said layer to form a unitary monolithic matrix.

15. A laundry care product, which comprises:

(a) at least one sheet according to claim 1; and

(b) said bleaching agent.

16. The sheet of claim 1 wherein the film consists essentially of said (a), (b) and (d).

17. The sheet of claim 3 wherein the film consists essentially of said (a), (b) and (d).

18. The laundry care product of claim 6 wherein the film consists essentially of said (a), (b) and (d).

19. The laundry care product of claim 7 wherein the film consists essentially of said (a), (b) and (d).

20. The laundry care product of claim 10 wherein the film consists essentially of said (a), (b) and (d).

21. The process of claim 14 wherein the film consists essentially of said (a), (b) and (d).

22. The laundry care product of claim 15 wherein the film consists essentially of said (a), (b) and (d).