Rheology modifier for aqueous surfactant-based formulations
The present invention relates to aqueous formulations useful in useful in personal care, oral care, household and institutional applications which contain polymers comprised of water soluble synthetic backbone with covalently connected hydrophobic ends can deliver ‘salt-like’ rheology to surfactant formulations containing surfactant concentrations at which thickening by salt is not effective.
1. An aqueous formulation useful in personal care, household and institutional applications comprising:
a. an amount of an associative thickener comprising a polymer composition having a water soluble or water swellable synthetic polymer backbone that has covalently connected ends and/or intermediate blocks of oligomeric hydrophobes that are selected from the group consisting of i) alkyl and aryl moieties containing a polymerizable cyclic monomer, ii) a polymerizable double bond, and iii) derivatives of i) and ii), wherein the blocks are two or more units of the same or different hydrophobes;
b. and amount of a surfactant; and
c. water;
wherein the amount of the associative thickener contained in the aqueous formulation is from about 0.1 to about 5 wt %, and the amount of surfactant contained in the aqueous formulation is from about 5 to about 50 wt %, and wherein the polymer composition having a water soluble or water swellable synthetic polymer backbone further comprises an ethylhexyl glycidyl ether (EHGE) modified polyacetalpolyether.
2. The aqueous formulation of claim 1 , further comprising an amount of a physiologically tolerated salt selected from the group consisting of sodium sulfate, potassium chloride and sodium chloride, wherein the amount of salt contained in the aqueous formulation is from about 0.1 to about 5 wt %.
3. The aqueous formulation of claim 2 , wherein the physiologically tolerated salt comprises sodium chloride.
4. The aqueous formulation of claim 1 , wherein the amount of the associative thickener contained in the aqueous formulation is in the range of about 0.1 to about 3 wt %.
5. The aqueous formulation of claim 4 , wherein the amount of the associative thickener contained in the aqueous formulation is in the range of about 0.2 to about 2 wt %.
6. The aqueous formulation of claim 1 , wherein the amount of the surfactant contained in the aqueous formulation is from about 7 to about 48 wt %.
7. The aqueous formulation of claim 1 , the polymer composition having a water soluble or water swellable synthetic polymer backbone has a weight average molecular weight (Mw) with the upper limit of the polymer being about 10,000,000.
8. The aqueous formulation of claim 7 , wherein the polymer composition having a water soluble or water swellable synthetic polymer backbone has a weight average molecular weight (Mw) with the upper limit of the polymer being about 1,000,000.
9. The aqueous formulation of claim 8 , wherein the polymer composition having a water soluble or water swellable synthetic polymer backbone has a weight average molecular weight (Mw) with the upper limit of the polymer being about 100,000.
10. The aqueous formulation of claim 7 , wherein the polymer composition having a water soluble or water swellable synthetic polymer backbone has a weight average molecular weight (Mw) with the lower limit of about 400.
11. The aqueous formulation of claim 10 , wherein the polymer composition having a water soluble or water swellable synthetic polymer backbone has a weight average molecular weight (Mw) with the lower limit of about 1,000.
12. The aqueous formulation of claim 11 , wherein the polymer composition having a water soluble or water swellable synthetic polymer backbone has a weight average molecular weight (Mw) with the lower limit of about 4,000.
13. The aqueous formulation of claim 1 , wherein the surfactant is selected from the group consisting of ammonium lauryl sulfate, sodium lauryl sulfate, ammonium laureth sulfate, sodium laureth sulfate and cocamidopropyl betaine.
14. The aqueous formulation of claim 1 , further comprising an amount of an emollient selected from the group consisting of silicone oils, silicone derivatives, essential oils, oils, fats, fatty acids, fatty acid esters, fatty alcohols, waxes, polyols, hydrocarbons, and mixtures thereof.
15. The aqueous formulation of claim 14 , wherein the emollient comprises silicone oil.