Low foaming automatic dishwashing compositions

C - Chemistry – Metallurgy – 11 – D

Patent

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Details

C11D 1/825 (2006.01) C11D 1/68 (2006.01) C11D 1/72 (2006.01) C11D 3/06 (2006.01) C11D 3/075 (2006.01) C11D 3/39 (2006.01) C11D 1/722 (2006.01) C11D 3/386 (2006.01)

Patent

CA 2265825

Automatic dishwashing detergent compositions comprising a mixed nonionic surfactant system comprising low cloud point and high cloud point nonionic surfactants. The low cloud point nonionic surfactant has the formula: R1O[CH2CH(CH3)O]x[CH2CH2O]y CH2CH(OH)R2 wherein R1 is a linear or branched, aliphatic hydrocarbon radical having from about 4 to about 18 carton atoms; R2 is a linear or branched aliphatic hydrocarbon radical having from about 2 to about 26 carbon atoms; x is an integer having an average value of from 0.5 to about 1.5; and y is an integer having a value of at least about 15. The high cloud point nonionic surfactant comprises an ethoxylated surfactant derived from the reaction of a monohydroxy alcohol containing from about 10 to about 16 carbon atoms, with from about 6 to about 15 moles of ethylene oxide per mole of alcohol on an average basis and having a hydrophile-lipophile balance value within the range of from about 12 to about 14.

Cette invention concerne des compositions pour lave-vaisselle automatiques qui contiennent une solution de tensioactifs non ioniques mélangés incluant un tensioactif non ionique à point de trouble peu élevé et un tensioactif non ionique à point de trouble élevé. Le tensioactif non ionique doté d'un point de trouble peu élevé est représenté par la formule R1O[CH2CH(CH3)O]x[CH2CH2O]yCH2CH(OH)R2 dans laquelle R1 est un radical hydrocarbure aliphatique, linéaire ou ramifié comportant de 4 à 18 atomes de carbone environ; R2 est un radical hydrocarbure aliphatique, linéaire ou ramifié comportant de 2 à 26 atomes de carbone environ; x est un entier ayant une valeur moyenne comprise entre 0,5 et 1,5 environ; et y est un entier supérieur ou égal à 15. Le tensioactif non ionique à point de trouble élevé comporte un tensioactif éthoxylé provenant de la réaction d'un monohydroxy alcool contenant de 10 à 16 atomes de carbone environ, avec 6 à 15 moles environ d'oxyde d'éthylène par mole d'alcool en moyenne et possédant une valeur d'équilibre hydrophile-lipophile comprise approximativement entre 12 et 14.

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