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AssigneeColgate-Palmolive Company
InventorsPatrizia Barone, Pallassana Ramachandran
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Detergent laundry bars of improved foaming properties during hand washing of laundry are described which include 15 to 45% of a mixture of 0.05 to 20 parts of sodium higher fatty alcohol sulfate and 1 part of sodium alpha-sulfo-higher fatty acid lower alkyl ester, 10 to 60% of a builder for the detergent mixture, a bodying proportion, in the range of 20 to 70%, of water insoluble powder and/or sodium sulfate filler, and 5 to 22% of water (including that which is removable from any hydrate components when the bar is subjected to heating at 105.degree. C. for two hours). Preferably the invented bars will comprise 5 to 20% of sodium coco alcohol sulfate, 10 to 20% of sodium alpha-sulfo-higher fatty acid methyl ester, 8 to 20% of sodium tripolyphosphate, 5 to 15% of sodium carbonate, 1 to 6% of sodium silicate, 20 to 35% of calcium carbonate powder, 0 to 15% of talc and 7 to 11% of water. The described bars, which are preferably milled and plodded, exhibit better foaming properties in use, with initial foaming, persistence of foaming and regeneration of foam when the wash water is re-used (especially regeneration foaming) being greater than those of comparable bars in which sodium higher fatty alcohol sulfate is employed alone. The invented laundry bars are also milder to the hands and human skin than comparable bars based on sodium higher fatty alcohol sulfate as the sole anionic detergent thereof. The invented bar formula is also more easily processable during production than bars of similar formulas, but which contain either higher alcohol sulfate or alpha-sulpho-higher fatty acid methyl ester, so that the manufacturing throughput rates may be increased, power consumption may be lowered, and a more homogeneous product may be produced. Also described are a process for manufacturing the present detergent laundry bars, a method of testing them for foaming characteristics, and a foam test apparatus.
A method for determining comparative foaming characteristics of a detergent laundry bar, relatable to actual use of such a bar when it is employed for hand washing of laundry, which comprises dissolving/dispersing in wash water a washing concentration of a detergent laundry bar or the components thereof, subjecting the resulting wash water containing detergent laundry bar components to agitating action of at least a pair of oscillating agitators and corresponding twisting and untwisting action of textile material that is maintained in contact with the agitators, halting the movements of the agitators and the textile material, and measuring the height of foam above the wash water.
An apparatus for determining comparative foaming characteristics of detergent laundry bars relatable to actual foaming characteristics of such bars when employed for hand washing of laundry, which comprises a container for holding wash water, at least a pair of oscillatable agitators, means for oscillating such agitators, and a textile material maintained in contact with said agitators, so that it twists and untwists as the agitators are oscillated in the wash water, simulating the movement of laundry in wash water during hand washing of the laundry.
Dependencies are inferred from the claim text.