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Alkali-swellable acrylic emulsions comprising acrylic acid, use thereof in aqueous formulations and formulations containing same

A technology of acrylic and emulsion, which is applied in the direction of medical preparations containing active ingredients, skin care preparations, cosmetic preparations, etc., and can solve problems such as strategic risks

Active Publication Date: 2013-03-20
COATEX SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, technologies that rely solely on materials are strategically risky for their manufacturers and users

Method used

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  • Alkali-swellable acrylic emulsions comprising acrylic acid, use thereof in aqueous formulations and formulations containing same
  • Alkali-swellable acrylic emulsions comprising acrylic acid, use thereof in aqueous formulations and formulations containing same
  • Alkali-swellable acrylic emulsions comprising acrylic acid, use thereof in aqueous formulations and formulations containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Test No. 1 according to the invention

[0078] This test concerns the manufacture of an ASE-type emulsion comprising a copolymer consisting of the following monomers expressed in weight percent:

[0079] a) 36.4% acrylic acid,

[0080] b) 62.4% ethyl acrylate,

[0081] c) 1.2% AMPS.

[0082] Add 550 g of secondary deionized water and 7.0 g of AMPS solution (55% AMPS aqueous solution neutralized with sodium hydroxide, produced by LUBRIZOL TM marketed by the company under the name AMPS 2405).

[0083] The medium was heated to 78°C and a catalytic system consisting of 0.96 g of ammonium persulfate dissolved in 10 g of double deionized water and 0.096 g of sodium metabisulfite dissolved in 10 g of double deionized water was added via a funnel.

[0084] Afterwards, 236 g of ethyl acrylate and 85 g of acrylic acid (90%) were added continuously and gradually.

[0085] The temperature of the reaction medium was maintained at 78°C (± 2) throughout the addition.

[0086] O...

Embodiment 2

[0107] This example illustrates the thickening efficacy of an emulsion of the invention used in water such that the active ingredient level is 5% of the dry polymer. When added to water, the medium was neutralized to a pH between 4.9 and 5.5 by adding sodium hydroxide, and the Brookfield of the medium was measured at 25 °C and 100 RPM TM Viscosity, whose values ​​are given in Table 2.

[0108]

[0109] Table 2

[0110] The thickening properties of the produced emulsions were thus demonstrated from the moment they were placed under alkaline conditions.

[0111] Furthermore, the thickening effect at such low pH was unexpectedly noted; typically, ASE and HASE type emulsions thicken in the pH range of 6 to 7.

[0112] "Low pH" thickening is particularly difficult to achieve and is of interest in the cosmetic field where thickening effects in the pH range of the skin (ie between 5 and 6 pH units) are desired. This is reported in document EP 2 027 169 A1.

Embodiment 3

[0114] This example illustrates the use of a commercially available thickening emulsion of the ASE type (with surfactant) and a surfactant-free emulsion according to the present invention in concrete formulations.

[0115] In order to do this, concrete is prepared using techniques well described in the literature, consisting of the following substances:

[0116] -300kg CEM I 52.5N cement;

[0117] -880 large grit 10 / 20;

[0118] -110kg 0 / 4 sand;

[0119] Where the ratio W / C of water to cement is set at 0.5, the following substances are added relative to the dry weight of cement:

[0120] -1.23% by weight of dispersant, by COATEX TM Company under the name Ethacryl TM 1030 sale;

[0121] -1% by weight defoamer, by HUNTSMANN TM Company under the name Empilan TM PF 7169 for sale.

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Abstract

The invention relates to novel alkali-swellable thickening emulsions free from methacrylic acid, which monomer has been hitherto indispensable, making manufacturers dependent on this raw material. Said novel emulsions contain a certain amount of 2-acrylamido-2-methylpropanesulfonic acid (or AMPS, CAS number: 40623-75-4). In addition, these emulsions can be produced in the absence of surfactant, thereby preventing the formation of foam. Moreover, said emulsions are proven to be effective for the thickening of aqueous media, in particular media having a pH of between 5 and 6, such as the skin.

Description

technical field [0001] The present invention relates to new alkali-swellable thickening emulsions free of methacrylic acid, the monomer which was heretofore indispensable in such emulsions, making manufacturers dependent on this raw material. These new emulsions contain a certain amount of 2-acrylamido-2-methylpropanesulfonic acid (or CAS No: 40623-75-4). They can also be prepared in the absence of surfactants, which prevents foam formation. Finally, they are effective for the thickening of aqueous media, including media with a pH of 5 to 6, such as skin. Background technique [0002] It is found in many fields (aqueous paints, paper coating dispersions, mineral suspensions, detergents, cosmetic preparations, or the field of concrete and cement) that aqueous formulations can contain mineral fillers. [0003] During the manufacturing phase of these products, as well as during their transport, storage or implementation, their rheology must be controlled. Differences in pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/12C08F220/28C08F220/58A61K8/81C04B24/26C08F2/22C08F283/06C09D7/12C11D3/37D21H21/14C09D7/00
CPCC08F220/58A61K8/81C04B24/2652C04B24/2641C04B2103/44D21H19/24C09D7/002A61K2800/48C08F220/28C08F220/12C08F290/062C08F220/06C08F2/22A61Q19/00A61K2800/10D21H21/14C04B24/26C04B24/163C08F283/06C09D7/12C11D3/37C04B24/2647A61K8/8158C09D7/43C08F220/1802C08F220/286C08F220/585C08F220/14
Inventor 让-马克·苏奥
Owner COATEX SA
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