Diaper having a lotioned topsheet

• US 5,643,588 A
• Filed: 11/28/1994
• Issued: 07/01/1997
• Est. Priority Date: 11/28/1994
• Status: Expired due to Term

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Roe, Donald Carroll, Warner, Alrick Vincent, Bakes, Frank Heinrich
• Primary Examiner(s): Page, Thurman K.
• Assistant Examiner(s): Shelborne, Kathryne E.
• Application Number:
  US08/345,159
• Time in Patent Office: 946 Days
• Field of Search: 424/402, 424/443, 604/304, 604/359, 604/360, 604/363, 604/364, 604/376, 604/378, 604/381, 604/890.1, 602/48, 602/51
• US Class Current: 424/402
• CPC Class Codes: A61F 13/51113 comprising an additive, e.g. lotion or odour control A61F13/51108 takes precedence
• CPC Class Codes: A61F 13/8405 Additives, e.g. for odour, disinfectant or pH control
• CPC Class Codes: A61F 2013/51117 the lotion having skin care properties
• CPC Class Codes: A61K 2800/31 Anhydrous
• CPC Class Codes: A61K 8/0208 Tissues; Wipes; Patches
• CPC Class Codes: A61K 8/31 Hydrocarbons
• CPC Class Codes: A61K 8/39 Derivatives containing from 2 to 10 oxyalkylene groups
• CPC Class Codes: A61K 8/4973 with oxygen as the only hetero atom
• CPC Class Codes: A61K 8/4993 Derivatives containing from 2 to 10 oxyalkylene groups
• CPC Class Codes: A61L 15/34 Oils, fats, waxes or natural resins A61L15/225 takes precedence
• CPC Class Codes: A61L 15/48 Surfactants
• CPC Class Codes: A61Q 19/00 Preparations for care of the skin
• CPC Class Codes: D21H 17/06 Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
• CPC Class Codes: D21H 17/07 Nitrogen-containing compounds
• CPC Class Codes: D21H 17/14 Carboxylic acids; Derivatives thereof
• CPC Class Codes: D21H 17/20 Macromolecular organic compounds
• CPC Class Codes: D21H 21/24 Surfactants

Abstract

A diaper containing a liquid pervious topsheet coated with a lotion composition is disclosed. The lotion composition reduces the adherence of BM to the skin of the wearer, thereby improving the ease of BM clean up. The lotion composition comprises a plastic or fluid emollient such as mineral oil or petrolatum, an immobilizing agent such as a fatty alcohol or paraffin wax to immobilize the emollient on the surface of the diaper topsheet, and optionally a hydrophilic surfactant to improve wettability of the coated topsheet. Because the emollient is substantially immobilized on the surface of the topsheet, less lotion is required to impart the desired therapeutic or protective lotion coating benefits.

Claims

1. A disposable diaper comprising:

A) a liquid impervious backsheet;

B) a liquid pervious, hydrophilic topsheet joined to said backsheet, said topsheet having an inner surface oriented toward the interior of said diaper and an outer surface oriented toward the skin of the wearer when said diaper is being worn, wherein at least a portion of said topsheet outer surface comprises an effective amount of a lotion coating which is semisolid or solid at 20°

C. and which is partially transferable to the wearer'"'"'s skin, said lotion coating comprising;

(i) from about 10 to about 95% of a substantially water free emollient having a plastic or fluid consistency at 20°

C., wherein said emollient contains about 5% or less water, said emollient comprising a member selected from the group consisting of petroleum-based emollients, fatty acid ester emollients, alkyl ethoxylate emollients, and mixtures thereof;

(ii) from about 5 to about 90% of an agent capable of immobilizing said emollient on said outer surface of the topsheet, said immobilizing agent being miscible with said emollient, said immobilizing agent having a melting point of at least about 35°

C., wherein said immobilizing agent is selected from the group consisting of polyhydroxy fatty acid esters, polyhydroxy fatty acid amides, C₁₄ -C₂₂ fatty alcohols, C₁₂ -C₂₂ fatty acids, C₁₂ -C₂₂ fatty alcohol ethoxylates, and mixtures thereof; and

C) an absorbent core positioned between said topsheet and said backsheet.

2. The disposable diaper of claim 1 wherein said emollient comprises a petroleum based emollient selected from the group consisting of mineral oil, petrolatum, and mixtures thereof.

3. The disposable diaper of claim 2 wherein said emollient is petrolatum.

4. The disposable diaper of claim 3 wherein said emollient is mineral oil.

5. The disposable diaper of claim 1 wherein the quantity of lotion coating on said portion of said topsheet outer surface ranges from about 0.1 mg/in² to about 25 mg/in².

6. The disposable diaper of claim 5 wherein the quantity of lotion coating on said portion of said topsheet outer surface ranges from about 1 mg/in² to about 10 mg/in².

7. The disposable diaper of claim 1 wherein said emollient comprises a fatty acid ester emollient selected from the group consisting of methyl palmitate, methyl stearate, isopropyl laurate, isopropyl myristate, isopropyl palmitate, ethylhexyl palmitate, lauryl lactate and cetyl lactate, and mixtures thereof.

8. The disposable diaper of claim 1 wherein said emollient comprises an alkyl ethoxylate emollient selected from the group consisting of C₁₂ -C₁₈ fatty alcohol ethoxylates having an average degree of ethoxylation ranging from about 2 to about 30.

9. The disposable diaper of claim 1 wherein said lotion coating comprises from about 5 to about 50% of said immobilizing agent, said immobilizing agent having a melting point of at least about 40°

C.

10. The disposable diaper of claim 9 wherein said immobilizing agent comprises a C₁₄ -C₂₂ fatty alcohol.

11. The disposable diaper of claim 10 wherein said immobilizing agent comprises a C₁₆ -C₁₈ fatty alcohol selected from the group consisting of cetyl alcohol, stearyl alcohol, and mixtures thereof.

12. The disposable diaper of claim 9 wherein said immobilizing agent comprises a polyhydroxy fatty acid ester having the formula:

##STR5## wherein R is a C₅ -C₃₁ hydrocarbyl group;

Y is a polyhydroxyhydrocarbyl moiety having a hydrocarbyl chain with at least 2 free hydroxyls directly connected to the chain; and

n is at least 1.

13. The disposable diaper of claim 12 wherein said immobilizing agent comprises a polyhydroxy fatty acid ester selected from the group consisting of sorbitan esters of C₁₆ -C₂₂ saturated fatty acids, glyceryl monoesters of C₁₆ -C₂₂ saturated fatty acids, and sucrose esters of C₁₂ -C₂₂ saturated fatty acids.

14. The disposable diaper of claim 13 wherein said immobilizing agent comprises a polyhydroxy fatty acid ester selected from the group consisting of sorbitan palmitates, sorbitan stearates, sorbitan behenates, glyceryl monostearate, glyceryl monopalmitate, glyceryl monobehenate, sucrose mono- and di-stearate, and sucrose mono- and di-laurate.

15. The disposable diaper of claim 14 wherein said immobilizing agent comprises sorbitan stearates.

16. The disposable diaper of claim 9 wherein said immobilizing agent comprises a polyhydroxy fatty acid amide having the formula:

##STR6## wherein R¹ is H, C₁ -C₄ hydrocarbyl, 2-hydroxyethyl, 2-hydroxypropyl, methoxyethyl, methoxypropyl or a mixture thereof;

R² is a C₅ -C₃₁ hydrocarbyl group; and

Z is a polyhydroxyhydrocarbyl moiety having a linear hydrocarbyl chain with at least 3 hydroxyls directly connected to the chain.

17. The disposable diaper of claim 16 wherein R¹ is N-methyl, N-ethyl, N-propyl, N-isopropyl, N-butyl, N-2-hydroxyethyl, N-methoxypropyl or N-2-hydroxypropyl;

R² is straight chain C₁₁ -C₁₇ alkyl or alkenyl, or mixture thereof; and

Z is glycityl.

18. The disposable diaper of claim 17 wherein said immobilizing agent comprises a polyhydroxy fatty acid amide selected from the group consisting of N-lauryl-N-methyl glucamide, N-lauryl-N-methoxypropyl glucamide, N-cocoyl-N-methyl glucamide, N-cocoyl-N-methoxypropyl glucamide, N-palmityl-N-methoxypropyl glucamide, N-tallowyl-N-methyl glucamide, and N-tallowyl-N-methoxypropyl glucamide.

19. The disposable diaper of claim 9 wherein said immobilizing agent comprises a paraffin wax.

20. The disposable diaper of claim 1 wherein said lotion coating further comprises from about 1 to about 50% of a hydrophilic surfactant, said hydrophilic surfactant having an HLB value of at least about 4.

21. The disposable diaper of claim 20 wherein said lotion coating further comprises from about 1 to about 25% of said hydrophilic surfactant, said hydrophilic surfactant being nonionic and having an HLB value of from about 4 to about 20.

22. The disposable diaper of claim 21 wherein said hydrophilic surfactant comprises an ethoxylated alcohol having an alkyl chain of from about 8 to about 22 carbon atoms and having an average degree of ethoxylation ranging from about 1 to about 54.

23. The disposable diaper of claim 22 wherein said ethoxylated alcohol has an alkyl chain of from about 11 to about 22 carbon atoms and having an average degree of ethoxylation ranging from about 2 to about 30.

24. The disposable diaper of claim 23 wherein said hydrophilic surfactant comprises an ethoxylated sorbitan ester of a C₁₂ -C₁₈ fatty acid having an average degree of ethoxylation of from about 2 to about 20.