Cleaning compositions for solid surfaces – auxiliary compositions – Auxiliary compositions for cleaning – or processes of preparing – Textile softening or antistatic composition
Patent
1999-02-19
2000-07-25
Hardee, John R.
Cleaning compositions for solid surfaces, auxiliary compositions
Auxiliary compositions for cleaning, or processes of preparing
Textile softening or antistatic composition
510521, 510522, 510107, C11D 320
Patent
active
060936916
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to rinse added fabric softening compositions containing .beta.-keto-ester pro-fragrance compounds and methods for accomplishing the delivery of such organic pro-fragrance compounds to textile articles and other surfaces rinsed with said compositions. More particularly, the invention relates to rinse added fabric softening compositions in which there is a delayed release of fragrances from surfaces rinsed in an aqueous bath in the presence of conventional fabric softening ingredients.
BACKGROUND OF THE INVENTION
Most consumers have come to expect scented laundry products and to expect that fabrics which have been laundered to also have a pleasing fragrance. It is also desired by consumers for laundered fabrics to maintain the pleasing fragrance over time. Perfume additives make laundry compositions more aesthetically pleasing to the consumer, and in some cases the perfume imparts a pleasant fragrance to fabrics treated therewith. However, the amount of perfume carry-over from an aqueous laundry bath onto fabrics is often marginal and does not last long on the fabric. Fragrance materials are often very costly and their inefficient use in rinse added fabric softener compositions and ineffective delivery to fabrics from the rinse results in a very high cost to both consumers and fabric softener manufacturers. Industry, therefore, continues to seek with urgency for more efficient and effective fragrance delivery in fabric softener products, especially for improvement in the provision of long-lasting fragrance to the rinsed fabrics.
Carrier mechanisms for perfume delivery, such as by encapsulation, have been taught in the prior art. See for example, U.S. Pat. No. 5,188,753.
U.S. Pat. No. 5,378,468, Suffis et al, issued Jan. 3, 1995 describes specific types of personal care compositions, such as deodorant sticks, comprising assertedly "body-activated" fragrances. The term apparently refers to the previously known tendency of materials such as acetals and ketals derived from fragrance alcohols to hydrolyze under acidic pH conditions thereby releasing fragrance. See, for example, U.S. Pat. No. 3,932,520, Hoffman, issued Jan. 13, 1976.
See also, Steffen Arctander, "Perfume and Flavor Chemicals", Arctander, N.J., 1969. Factors affecting substantivity of fragrance materials on fabrics are discussed in Estcher et al. JAOCS 71 p. 31-40 (1994).
The selected potential fragrance materials described by Suffis et al include particular acetals and ketals, exemplified by propylene glycol vanillin acetal. The materials exemplified apparently are rather hydrophilic short chain alcohol or diol derivatives of fragrance aldehydes and ketones that upon hydrolysis, deliver one mole of the aldehyde per mole of the potential fragrance material. The present inventors believe that short chain hydrophilic acetal and ketal materials are incompatible with acidic rinse added fabric softening compositions as described hereinafter. The Suffis et al development is designed to be incorporated with a personal care product vehicle, resulting in clear deodorant sticks and the like.
For rinse added fabric softening use, it is important that rather hydrophobic pro-fragrant compounds be used in order to enhance deposition onto surfaces in the wash solution and retention on the washed surface during rinsing. In Suffis et al, the compositions containing the potential fragrance materials are applied directly to the substrate (i.e. skin); therefore, the deposition problems resulting from dilution, rinsing, etc. are not at issue.
Esters of perfume alcohols are known in the art for providing extended delivery of fragrances in fabric softening compositions. See, for example, U.S. Pat. No. 5,531,910, Severns, issued Jul. 2, 1996. However, the manufacture of pro-fragrant esters known in the art can present costly and significant synthetic challenges. Derivitization of tertiary fragrance alcohols into simple esters is particularly difficult, often resulting in low yields and increased levels of less desir
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Burkes Raymond Vernon
Costa Jill Bonham
Gardlik John Michael
Hartman Frederick Anthony
Severns John Cort
Echler, Sr. Richard S.
Hardee John R.
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim Wm.
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