US4735740A — Diperoxyacid precursors and method

Claim 1

Independent Claim 31 words

A diperoxyacid precursor compound having the structure ##STR15## wherein n is an integer from about 4 to about 18 and M is an alkali metal, an alkaline earth metal, or ammonium.

Claim 2

Dependent Claim 31 words

A diperoxyacid precursor compound having the structure ##STR15## wherein n is an integer from about 4 to about 18 and M is an alkali metal, an alkaline earth metal, or ammonium.

Claim 3

Dependent Claim 12 words

The compound as in claim 1 wherein n is 5 or 8.

Claim 4

Dependent Claim 10 words

The compound as in claim 2 wherein M is sodium.

Claim 5

Dependent Claim 85 words

A dry bleach composition comprising: a diperoxyacid precursor and a source of peroxide, the diperoxyacid precursor having the structure ##STR16## wherein n is an integer from about 4 to about 18 and M is an alkali metal, an alkaline earth metal, or ammonium, the source of peroxide in an amount effective to perhydrolyze at least most of the diperoxyacid precursor in the presence of an aqueous solution at a pH of at least about 9.0 and at a temperature of at least about 21° C.

Claim 6

Dependent Claim 85 words

A dry bleach composition comprising: a diperoxyacid precursor and a source of peroxide, the diperoxyacid precursor having the structure ##STR16## wherein n is an integer from about 4 to about 18 and M is an alkali metal, an alkaline earth metal, or ammonium, the source of peroxide in an amount effective to perhydrolyze at least most of the diperoxyacid precursor in the presence of an aqueous solution at a pH of at least about 9.0 and at a temperature of at least about 21° C.

Claim 7

Dependent Claim 31 words

The compound as in claim 4 wherein the source of peroxide includes sodium perborate monohydrate, sodium perborate tetrahydrate, sodium carbonate peroxyhydrate, sodium pyrophosphate peroxyhydrate, urea peroxyhydrate, sodium peroxide, and mixtures thereof.

Claim 8

Dependent Claim 23 words

The bleach composition as in claim 4 or 5 wherein a diperoxyacid forms from the diperoxyacid precursor as a result of perhydrolysis thereof.

Claim 9

Dependent Claim 111 words

A dry laundering composition comprising: an anionic, cationic, non-ionic, ampholytic or zwitterionic surfactant, or mixtures thereof; and a peroxygen bleach composition in an amount from about 1 wt. % to about 20 wt. % of the dry laundering composition, the peroxygen bleach composition including a diperoxyacid precursor and an alkaline peroxide, the diperoxyacid precursor having two ester moieties, the alkaline peroxide being in a mole ratio with respect to each ester moiety of the diperoxyacid precursor of at least about 2:1, the diperoxyacid precursor having the structure ##STR17## wherein n is an integer from about 4 to about 18 and M is an alkali metal, an alkaline earth metal, or ammonium.

Claim 10

Dependent Claim 111 words

A dry laundering composition comprising: an anionic, cationic, non-ionic, ampholytic or zwitterionic surfactant, or mixtures thereof; and a peroxygen bleach composition in an amount from about 1 wt. % to about 20 wt. % of the dry laundering composition, the peroxygen bleach composition including a diperoxyacid precursor and an alkaline peroxide, the diperoxyacid precursor having two ester moieties, the alkaline peroxide being in a mole ratio with respect to each ester moiety of the diperoxyacid precursor of at least about 2:1, the diperoxyacid precursor having the structure ##STR17## wherein n is an integer from about 4 to about 18 and M is an alkali metal, an alkaline earth metal, or ammonium.

Claim 11

Dependent Claim 36 words

The dry laundering composition as in claim 7 further comprising a laundry adjuvant, the laundry adjuvant including one or more of a detergent builder, a buffer, an enzyme, a wetting agent, a dye or a perfume.

Claim 12

Independent Claim 145 words

A method for synthesizing sulfonated phenyl esters comprising: providing an initial reaction mixture including a carboxylic acid or a dicarboxylic acid, a phenol sulfonate, a lower alkyl acid anhydride, and an alkyl hydrocarbon solvent, the phenol sulfonate and the lower alkyl acid anhydride each being in a molar ratio with respect to the dicarboxylic acid of at least about 2:1 or with respect to the carboxylic acid of at least about 1:1; heating the initial reaction mixture to a temperature between about 150° C. to about 300° C. and refluxing the heated reaction mixture for at least two hours to form an intermediate reaction mixture having a carboxylic acid by-product therein; and removing the carboxylic acid by-product as a distillate with the alkyl hydrocarbon solvent from the intermediate reaction mixture to form a subsequent mixture, said subsequent mixture including a sulfonated phenyl ester reaction product.

Claim 13

Independent Claim 145 words

A method for synthesizing sulfonated phenyl esters comprising: providing an initial reaction mixture including a carboxylic acid or a dicarboxylic acid, a phenol sulfonate, a lower alkyl acid anhydride, and an alkyl hydrocarbon solvent, the phenol sulfonate and the lower alkyl acid anhydride each being in a molar ratio with respect to the dicarboxylic acid of at least about 2:1 or with respect to the carboxylic acid of at least about 1:1; heating the initial reaction mixture to a temperature between about 150° C. to about 300° C. and refluxing the heated reaction mixture for at least two hours to form an intermediate reaction mixture having a carboxylic acid by-product therein; and removing the carboxylic acid by-product as a distillate with the alkyl hydrocarbon solvent from the intermediate reaction mixture to form a subsequent mixture, said subsequent mixture including a sulfonated phenyl ester reaction product.

Claim 14

Dependent Claim 46 words

The method as in claim 9 wherein the dicarboxylic acid has the structure ##STR18## wherein n is an integer from about 4 to about 18, and the heating of the initial reaction mixture is to a temperature of between about 150° C. to about 270° C.

Claim 15

Dependent Claim 29 words

The method as in claim 9 or 10 wherein the phenol sulfonate has the structure HOφSO.sub.3 M and M is an alkali metal, an alkaline earth metal, or ammonium.

Claim 16

Dependent Claim 22 words

The method as in claim 9 or 10 wherein the lower alkyl acid anhydride is acetic anhydride, propionic anhydride or butyric anhydride.

Claim 17

Dependent Claim 17 words

The method as in claim 9 or 10 wherein the lower alkyl acid anhydride is acetic anhydride.

Claim 18

Dependent Claim 28 words

The method as in claim 9 or 10 wherein the alkyl hydrocarbon solvent is hectane, octane, nonane, decane, undecane, dodecane, tridecane, mixtures thereof, or water insoluble isoparaffinic solvents.

Claim 19

Dependent Claim 22 words

The method as in claim 9 or 10 wherein the heating is at a temperature of about 200° to about 215° C.

Claim 20

Dependent Claim 22 words

The method as in claim 9 wherein the initial and the intermediate reaction mixture each has a solid and a liquid phase.

Claim 21

Dependent Claim 40 words

The method as in claim 10 wherein the sulfonated phenyl ester reaction product has the structure ##STR19## wherein n is an integer from about 4 to about 18 and M is an alkali metal, an alkaline earth metal, or ammonium.

Claim 22

Dependent Claim 19 words

The method as in claim 17 further comprising: isolating the reaction product following removal of substantially all acid by-product.

Claim 23

Dependent Claim 20 words

The method as in claim 18 wherein the reaction product is isolated by filtration and is thereafter purified by recrystallization.

Claim 24

Dependent Claim 37 words

The method as in claim 10 wherein the phenol sulfonate and the lower alkyl acid anhydride of the initial reaction are each in a molar ratio with respect to the dicarboxylic acid of greater than about 2:1.

Claim 25

Dependent Claim 17 words

The method as in claim 9 wherein the initial reaction mixture includes an acidic or basic catalyst.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-04-05	1991-10-05	1992-04-05	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-04-05	1995-10-05	1996-04-05	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-04-05	1999-10-05	2000-04-05	$7700.00	Window Closed / Lapsed

Diperoxyacid precursors and method

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