Emulsions containing modified aminoorganosiloxane impart reduced yellowing when used as fabric softeners

Claim 2

A process for preparing a modified aminoorganosiloxane emulsion having improved non-yellowing properties comprising reacting a dialkyl component selected from the group consisting of (a) a dialkyl pyrocarbonate, (b) a dialkyl oxalate, and (c) a mixture of (a) and (b) with an aminoorganosiloxane in an aqueous emulsion wherein the amount of said component ranges from about 0.1% to 15% based on the weight of aminoorganosiloxane in the emulsion.

Claim 3

A process according to claim 1 wherein the aminoorganosiloxane has the formula ##STR4## wherein R is the same or different and is a monovalent hydrocarbon selected from the group consisting of (i) an alkyl group having 1 to 4 carbon atoms, (ii) an aryl group having 6 to 7 carbon atoms, and (iii) an arylalkyl group having 7 to 10 carbon atoms; R 1 is selected from the group consisting of (i) an alkylene having 1 to 20 carbon atoms, (ii) an arylene having 6 to 14 carbon atoms, (iii) an alkoxyalkyl having 4 to 16 carbon atoms, and (iv) an aryloxyalkyl having 7 to 16 carbon atoms; R 2 is selected from the group consisting of (i) hydrogen, (ii) R as defined above, and (iii) an aminoorgano group of the formula --R.sup.3 N(R.sup.4)R.sup.5 wherein R 3 is selected from the group consisting of (i) an alkylene group having 1 to 20 carbon atoms, (ii) an arylene having 6 to 14 carbon atoms, (iii) an alkoxyalkyl having 4 to 16 carbon atoms, and (iv) an aryloxyalkyl having 7 to 16 carbon atoms; R 4 and R 5 are the same or different and each are a monovalent hydrocarbon selected from the group consisting of (i) an alkyl group having 1 to 4 carbon atoms, (ii) an aryl group having 6 to 7 carbon atoms, and (iii) an arylalkyl group having 7 carbon atoms; and wherein at least one R 2 , R 3 , R 4 or R 5 is a hydrogen atom; x is an integer equal to or greater than 0; y is an integer from 1 to 20; and the viscosity of the aminoorganosiloxane is from about 10 to about 10,000 centipoise at 25° C.

Claim 4

A process according to claim 2 wherein R is an alkyl group having 1 to 3 carbon atoms; R 1 is an alkylene group having from 1 to 5 carbon atoms; and x is 0 to 500.

Claim 5

A process according to claim 3 wherein R is an alkyl group having 1 to 2 carbon atoms; R 1 is an alkylene group having from 1 to 3 carbon atoms; x is 0 to 300 and y is 1 to 10.

Claim 6

A process according to claim 2 wherein the dialkyl pyrocarbonate is selected from the group consisting of dimethyl pyrocarbonate, diethyl pyrocarbonate, dipropyl pyrocarbonate, dibutyl pyrocarbonate, and dipentyl pyrocarbonate.

Claim 7

A process according to claim 2 wherein the dialkyl oxalate is selected from the group consisting of dimethyl oxalate, diethyl oxalate, dipropyl oxalate, dibutyl oxalate, and dipentyl oxalate.

Claim 8

A process according to claim 4 wherein the dialkyl pyrocarbonate is dimethyl pyrocarbonate.

Claim 9

A process according to claim 4 wherein the dialkyl pyrocarbonate is diethyl pyrocarbonate.

Claim 10

A process according to claim 4 wherein the dialkyl oxalate is dimethyl oxalate.

Claim 11

A process according to claim 4 wherein the dialkyl oxalate is diethyl oxalate.

Claim 12

A process according to claim 2 wherein the amount of said dialkyl component ranges from about 1% to 10% based on the weight of aminosiloxane in the emulsion.

Claim 13

A process according to claim 2 wherein the amount of said dialkyl component ranges from about 2% to 15% based on the weight of aminoorganosiloxane in the emulsion.

Claim 14

A process according to claim 1 wherein the modified aminoorganosiloxane emulsion has a polymer content ranging from about 1 to 80 percent by weight.

Claim 15

A process according to claim 1 wherein the modified aminoorganosiloxane emulsion has a polymer content ranging from about 10 to 60 percent by weight.

Claim 16

A process according to claim 14 wherein the polymer content ranges from about 20 to 50 percent by weight.

Claim 17

A process according to claim 1 wherein the modified aminoorganosiloxane emulsion is applied to a fabric substrate by spraying, dipping or kiss roll application.

Claim 18

A process according to claim 16 wherein the fabric substrate is produced from fibrous material selected from natural fibers, synthetic fibers, and inorganic fibers, and blends thereof.

Claim 19

A process according to claim 17 wherein the natural fibers are selected from cotton, flax, silk and wool; the synthetic fibers are selected from polyester, polyamide, polyacrylonitrile, polyethylene, polypropylene and polyurethane; and the inorganic fibers are selected from glass fiber and carbon fiber.

Claim 20

A modified aminoorganosiloxane emulsion prepared according to claim 1.

Claim 21

A modified aminoorganosiloxane emulsion prepared according to claim 14.