Inversion of inverse emulsion polymers
View Patent ↗A method to invert an inverse emulsion water compatible polymer product using a combination of surfactants that have specific chemical structures is disclosed. A combination, or blend, of two or more surfactants provides for an effective breaker system. The blend of surfactants is more effective than the individual surfactants.
1. A method of inverting a water in oil polymer emulsion comprising (a) providing a water in oil emulsion having a water compatible polymer in the aqueous phase, (b) contacting the water in oil polymer emulsion with an effective amount of a surfactant combination of at least two breaker surfactants comprising at least one polymeric breaker surfactant and a second non-polymeric breaker surfactant, wherein the polymeric breaker surfactant contains one or more polymeric hydrophilic segments, and one or more polymeric hydrophobic segments, said segments being comprised of more than 5 monomer units covalently bonded to each other, and (c) inverting the emulsion.
2. The method of claim 1 wherein the at least one polymeric breaker surfactant has two or more polymeric hydrophilic segments.
3. The method of claim 1 wherein at least one of the one or more polymeric hydrophilic segments is a polyglycol segment.
4. The method of claim 1 wherein the at least one polymeric breaker surfactant containing one or more hydrophilic segments is an ethylene oxide/propylene oxide copolymer.
5. The method of claim 1 wherein the at least one polymeric breaker surfactant is an ethylene oxide/propylene oxide copolymer produced with a diol starter.
6. The method of claim 1 wherein the at least one polymeric breaker surfactant is an ethyleneoxide/propylene oxide copolymer produced with an ethylene diamine starter.
7. The method of claim 1 , wherein the at least one polymeric breaker surfactant is an ethyleneoxide/propylene oxide copolymer produced with a trimethylol propane starter or in the alternative produced with a glycerol starter.
8. The method of claim 1 wherein the second breaker surfactant is selected from the group consisting of alcohol ethyoxylate, ethoxylated fatty acid esters, ethoxylated sorbitan fatty acid esters, ethoxylated esters of fatty acid and combinations thereof.
9. The method of claim 1 wherein the total amount of polymeric breaker surfactant and second breaker surfactant is less than about 10% by weight based on the total weight of the emulsion.
10. The method of claim 9 wherein the total amount of polymeric breaker surfactant and second breaker surfactant is less than about 5% by weight based on the total weight of the emulsion.
11. The method of claim 1 wherein the polymeric surfactant comprises at least about 2.0 wt % of the breaker surfactant combination.
12. The method of claim 11 wherein the polymeric surfactant comprises at least about 2.0 to 98 wt % of the breaker surfactant combination.
13. The method of claim 12 wherein the polymeric surfactant comprises at least about 2.5% to 75 wt % of the breaker surfactant combination.
14. The method of claim 1 wherein the water compatible polymer comprises at least one amphophilic monomer.
15. The method of claim 14 wherein the amphophilic monomer is selected from the group consisting of vinylbenzyl trimethylammonium chloride; styrene sulfonic acid; salts of styrene sulfonic acid; fatty alkyl or alkyl polyoxyethyl (meth)acrylic acid esters; vinyl alkoxylates; allyl akloxylates; allyl polyoxyalkylene sulfates; and monomers containing fluorine atoms and combinations thereof.
16. The method of claim 1 wherein the water compatible polymer is prepared by a inverse emulsion process comprising emulsification surfactants containing at least one diblock or triblock polymeric surfactant.