Random polyether foam control agents
AssigneeUnion Carbide Corporation
InventorsGeorge E. Totten, Gordon C. Johnson
Life of this patent
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Abstract
Improved mechanical dishwasher formulations are provided which are characterized by the use of a random copolyether foam control agent, and wherein the foam control agent imparts the desirable properties of cleaning and defoaming without the concurrent buildup of spots and films on the dishes. The foam control agent is a copolyether having a molecular weight of at least about 2000 and containing random propyleneoxy (and/or butyleneoxy) groups and ethyleneoxy groups. The amount of ethyleneoxy and propyleneoxy or butyleneoxy groups present in the copolyether is selected such that the cloud point of the foam control agent is equal to, or less than, the operating temperature of the mechanical dishwasher.
Claims29
A formulation for use in a mechanical dishwasher, said formulation having low foaming properites and which leaves a minimum of spotting and filming on articles washed in said mechanical dishwaser, said formuation containing a foam controlling amount of a copolyethers having a molecular weight of at least about 2000, and containing random ethyleneoxy groups, copolymerized with at least one other alkyleneoxy group selected from the group consisting of propyleneoxy and butyleneoxy groups, wherein said ethyleneoxy groups are present in an amount of at least about 20 percent by weight of the polyether component of said polyether, and wherein said polypropyleneoxy and butyleneoxy groups are present in an amount such that the cloud point of said foam control agent is no greater than the operating temperature of said mechanical dishwasher.
A mechanical dishwasher detergent comprising:
- (a) from about 90 to 95 weight percent of at least one builder;
- (b) from about 0.5 to about 5.0 weight percent of a compound which liberates active chlorine;
- and
- (c) from about 1 to about 5 weight percent of a copolyether foam control weight selected from the group consisting of polyethers of the formulae:
- ##STR17## wherein R is derived from a saturated or unsaturated alcohol having up to 36 carbon atoms, or is an alkylaryl group;
- R' is a methyl or ehtyl group;
- R" is an alkyl group having from 3 to 36 carbon atoms, or an alkylaryl group;
- x and y are integers selected in any ratio such that the final polyether does not contain more than 75 weight percent of ethylene oxide;
- z is an integer of from 0 to 4;
- X is hydrogen, chloro, alkyl of from 1 to 24 carbon atoms, alkylaryl, a beta-hydroxy alkyl group, an alkylcarbonyl group or an arylcarbonyl group;
- w has a value of from 2 to 40;
- Z is:
- ##STR18## wherein R' and X are defined as above;
- x' and y' are integers selected such that the sums of (x'+x) and (y'+y) are such that the polyether does not contain more than 75 percent by weight of ethylene oxide;
- z' is an integer of from 0 to 15;
- A is the residue of an alcohol having a hydroxy functionality of from 1 to 6;
- and n is integer of from 1 to 6;
- provided that when R is other than an alkylaryl group, then the molecular weight of the copolyether is at least about 2000.
The mechanical dishwasher detergent of claim 34, wherein X is hydrogen, R is C.sub.12 H.sub.25 -C.sub.14 H.sub.29 alkyl, R' is methyl, the ratio of x to y is 58:42, and the molecular weight is 4200.
Dependencies are inferred from the claim text.