Us6063857a solubilized hydrophobicallymodified alkalisoluble. At low ph conditions and in the presence of anionic, cationic, and nonionic surfactants, hydrophobically modified alkali soluble emulsions hase exhibit pronounced interaction that results in the solubilization of the latex. Hydrophobicallymodified alkalisoluble emulsion hase polymers are polymers which are typically utilized for increasing the viscosity of aqueous solutions. Oct 23, 2000 the guidelines in this article apply to organic thickeners and rheology modifiers. Ep2712898a1 hydrophobically modified alkali soluble. Rheology modification processing efficiency solutions. Aqueous solutions of hydrophobically modified alkali soluble emulsion polymers which exhibit relatively low solution viscosity are disclosed. Acusol 810a,acusol 830,acusol 835,acusol 842 acusol 801s,acusol 805s,acusol 820,acusol 823 acusol 880,acusol 882 5 acusol rheology modifierchemistries 3 theacusol productlineconsists ofthreedifferentchemistries alkalisolubleemulsionase, hydrophobicallymodifiedalkali solubleemulsionhaseand. The guidelines in this article apply to organic thickeners and rheology modifiers. Solution rheology of a hydrophobically modified alkali. Hydrophobically modified ethylene oxide ur ethane heur hydrophobically modified cellulose ethers hm cellulose associative ethers thixotropic titanium, zirconium chelates clays. Industrial applied rheology attempts to relate fundamental properties to fitnessforuse of fluids of commerce. Hydrophobically modified alkaliswellable emulsions hasethickeners like asethickeners, these are dispersions of waterinsoluble acrylic polymers in water. Aculyn 22 rheology modifier is an anionic hydrophobically modified alkali soluble acrylic polymer emulsion.
The success of a wide range of commercial products and industrial processes depends on meeting specific flow requirements. Relaxation spectra and viscoelastic behavior of a model. Such solutions are particularly useful for controlling the viscosity of aqueous systems to which the solutions are added. Unlike synthetic associative rheology modifiers such as hydrophobically modified alkalisoluble emulsions hase, natrosol he 3kb offers less sensitivity to ph, surfactants, and other paint additives. The dynamic moduli can be fitted with a multiple modes maxwell model. The three most popular types of commercial associative polymers are. Hydrophobically modified alkalisoluble emulsions as thickeners. The polymer typically is a copolymer which contains an anionic group, a hydrophobic group, and a nonionic group. Hydrophobically modified alkali soluble emulsions as thickeners for exterior latex paints s.
Rheology of hydrophobicalkalisolubleemulsions hase and the. Hydrophobically modified alkalisoluble emulsions as thickeners for exterior latex paints s. Hases are modifications of ases following an addition of hydrophobic functional groups. Architectural and industrial coatings, molded plastics, adhesives, personal care products and cosmetics, inks, cement, drilling muds, ceramic slips, solder. New hydrophobicallymodified acrylic technology to create.
Aculyn 28 is synthesized from acrylic acid, acrylate. Centre for water soluble polymers, north east wales institute, wrexham ll11 2aw, u. Rheology of hydrophobicalkalisolubleemulsions hase and. Solubilized hydrophobicallymodified alkalisoluble emulsion. At low ph conditions and in the presence of anionic, cationic, and nonionic surfactants, hydrophobically modified alkalisoluble emulsions hase exhibit pronounced interaction that results in the solubilization of the latex. The rheological behavior of a model hydrophobically modified alkali soluble emulsion hase polymer, comprised of a random copolymer backbone of methacrylic acid and ethylacrylate and pendant hydro. The viscoelastic behavior of a semidilute hydrophobically modified alkalisoluble emulsion hasec20 polymer in nacl and naclsds sodium dodecyl sulfate solutions was determined using a rheometric fluids rheometer and the data were converted to relaxation spectra. Hydrophobically modified alkali soluble emulsion hase nonionic synthetic associative thickeners incl. The molecular weight of these polymers is of the order of 10. Jan 30, 2018 the emulsification of amphiphilic polymer is inevitably affected by the salinity environment in the preparation and flooding process. Pdf preparation and evaluation of hydrophobically modified. Salt effect on hydrophobically modified polyacrylamide.
At the same polymer concentration, npj1 is appreciably more viscous and elastic than npj2. Acrysol rm7 rheology modifier is a remarkably versatile hydrophobically modified alkalisoluble emulsion hase thickening agent for latex coatings. Nonionic hydrophobically modified ethoxylated urethane heur thickeners provide good performance in both interior and exterior paints, but are more costly than. The characterization of hydrophobically modified alkali soluble emulsions hase using conventional techniques such as gel permeation chromatography or static light scattering is difficult because. Unlike synthetic associative rheology modifiers such as hydrophobically modified alkali soluble emulsions hase, natrosol he 10k modified hec offers less sensitivity to ph, surfactants, and other paint additives. Pdf the effect of hydroxyl ethyl cellulose hec and. Hydrophobically modified alkali soluble emulsion how is. These are tertiary polymers that build on the ase chemistry by adding a hydrophobic acrylic ester monomer to the polymer composition.
Provides low cost and high performance in high pvc economy latex paints when diluted with water andor colorants. Hydrophobically modified alkali soluble emulsion hase polymer is solubilized by the addition of a base. The b0 behavior is already reported for the system without hydrophobic groups, a newtonian comportment as a. Compared to the above listed and well investigated systems, alkali soluble emulsions ase represent less extensively studied systems. Hase stands for hydrophobically modified alkali soluble emulsion.
Associative polymers of the hase system can be classified as hydrophobically modified anionic polyelectrolytes. Structureproperty relationship of model alkalisoluble rheology modifiers synthesised via the raft process by ewansprong dissertation presented for the degree of doctor ofphilosophy polymer science. Solution rheology of hydrophobically modified associative. Hnp and 3 synthetically derived anionic thickeners such as hydrophobicallymodified alkalisoluble or swellable emulsions hase. Hase is defined as hydrophobically modified alkali soluble emulsion somewhat frequently. Hydrophobically modified alkali soluble emulsion listed as hase. Rheological and photophysical data are presented for a hydrophobically modified alkalisoluble copolymer, of a constitution similar to materials currently employed as rheology modifiers in waterborne coatings. Hase hydrophobically modified alkali soluble emulsion. Aqueous solutions of hydrophobicallymodified alkalisoluble emulsion polymers which exhibit relatively low solution viscosity are disclosed. Hydrophobically modified alkali soluble emulsion polymers aocs. Rheology of hydrophobicalkalisolubleemulsions hase. Hydrophobically modified alkali soluble emulsion composition with polymeric beads download pdf info. Hydrophobically modified alkali soluble emulsions hase on the properties and quality of water based paints sandile s.
Again, the acid groups on the polymer chains must be neutralized to make the polymer chains water soluble. Acusol 820 rheology modifierstabilizer is a hydrophobically modified alkali soluble acrylic polymer emulsion hase with unusually high aqueous thickening and stabilising efficiency. Hydrophobically, modified alkali soluble emulsion hase alkali swellable emulsion ase hydrophobicallymodified ethoxylated urethanes heur hydrophobicallymodified nonionic polyol hnp xanthane gum silicones cylcomethicone, dimethicone organo modified silicones silicone emulsions specialty fluid blends. Rheological properties of hydrophobically modified alkali. Hydrophobically modified alkalisoluble emulsions as. This thickener is a liquid, cold processable product that instantaneously thickens upon neutralization providing ease of handling and increased manufacturing efficiency.
The high hydrophobicity of npj1 allows hydrophobic associations and. Aculyn 28 rheology modifierstabilizer a very efficient. Hydrophobically modified alkalisoluble emulsion hase polymer is solubilized by the addition of a base. The polymer is made through emulsion polymerization. Nov 20, 2019 molecular structure of a hydrophobically modified alkali. Rheological and photophysical data are presented for a hydrophobically modified alkali soluble copolymer, of a constitution similar to materials currently employed as rheology modifiers in waterborne coatings.
May 16, 2000 hydrophobically modified alkali soluble emulsion hase polymers are polymers which are typically utilized for increasing the viscosity of aqueous solutions. Us6063857a solubilized hydrophobicallymodified alkali. Steady and dynamic shear properties of two hydrophobically modified alkali soluble emulsions hase. Here, more general features of associative behavior are investigated. Hydrophobically modified alkali soluble emulsion how is hydrophobically modified alkali soluble emulsion abbreviated. Schaller rohm and haas research laboratories, spring house, pa 19477. Hase thickener rheology modifier is an anionic hydrophobically modified alkalisoluble acrylic polymer emulsion with unusually high aqueous thickening and stabilizing efficiency. Aug 05, 2014 highly hydrophobic and highly hydrophilic methacrylic monomers were copolymerized in heterophase system via a miniemulsion analogous polymerization technique. How is hydrophobically modified alkali soluble emulsion abbreviated. As with all natrosol products, natrosol he 10k modified hec provides consistent thickening and excellent package stability.
Influence of hydrophobe, surfactant and salt concentrations in hydrophobically modified alkalisoluble polymers 141 network hydrophobic groups dispersed and solubilized by the surfactant. Aculyn 22 rheology modifier is an anionic hydrophobically modified alkalisoluble acrylic polymer emulsion. Aculyn 28 is a hydrophobicallymodified alkali soluble emulsion hase. The variation of emulsions in stability and rheology has a significant influence on the efficiency of polymer flooding. Introduction associative thickeners are widely used as rheology modifiers in waterborne coatings and other aqueous systems. Thus, the effect of nacl and cacl2 on the emulsification behavior of hydrophobically modified polyacrylamide hmpam was investigated.
Hase rheology modifiers retain the ph dependent behavior and easy handling advantages of their ase. Us9155549b2 hydrophobically modified alkali soluble emulsion. Hec medium molecular weight hydroxyethyl cellulose, with a viscosity range. Facile synthesis of tunable alkali soluble latexes. Pdf a hydrophobic alkaliswellable modified emulsion hase with optimum. Hydrophobically modified alkalisoluble emulsions as thickeners for exterior latex paints. The characterization of hydrophobically modified alkalisoluble emulsions hase using conventional techniques such as gel permeation chromatography or static light scattering is difficult because. Hydrophobically modified associative polymer solutions. Steady and dynamic shear properties of two hydrophobically modified alkali soluble emulsions hase, npj1 and npj2, were experimentally investigated. Yet, it is not a universal characteristic of the whole class of associative polymers. Hase polymers are synthesized from an acidacrylate copolymer backbone and a monomer that connects the hydrophobic groups as side chains. Hydrophobically modified water soluble polymers, used by latex paint manufacturers as associative thickeners, provide significant advantages in improving film build and leveling, and decreasing spatter from rollerapplied paints. Hydrophobically modified watersoluble polymers, used by latex paint manufacturers as associative thickeners. When neutralized in aqueous solution with a suitable base, the latex particles are ionized as a result of the acid base reaction.
Stability of a model alkalisoluble associative polymer in. The viscoelastic behavior of a semidilute hydrophobically modified alkali soluble emulsion hasec20 polymer in nacl and naclsds sodium dodecyl sulfate solutions was determined using a rheometric fluids rheometer and the data were converted to relaxation spectra. Introduction of these thickeners to the coatings industry about three decades ago enabled coating formulators to optimize rheology in. Facile synthesis of tunable alkali soluble latexes, polymer. Recent patents related to rheology modifiers thickeners associatives hydrophobically modified alkalisoluble emulsions hase dec 14, 2017 uspto amineimino dialcohol neutralizing agents for low volatile compound aqueous organic coating compositions and methods for using same us 15541516. Hydrophobically modified alkali soluble emulsion polymers. Microstructure of unneutralized hydrophobically modified. Hydrophobically modified alkalisoluble emulsions hase. Mixed surfactant and hydrophobicallymodified polymer. Mixed surfactant and hydrophobicallymodified polymer compositions. It is hydrophobically modified alkali soluble emulsion.
Influence of hydrophobe, surfactant and salt concentrations. Viscoelastic properties of hydrophobically modified alkali. Aculyn 28 is a hydrophobically modified alkali soluble emulsion hase. Us6063857a us09119,500 us11950098a us6063857a us 6063857 a us6063857 a us 6063857a us 11950098 a us11950098 a us 11950098a us 6063857 a us6063857 a us 6063857a authority us united states prior art keywords weight cyclodextrin hydrophobically modified alkali soluble emulsion prior art date 19970729 legal status the legal status is an assumption and is not a legal conclusion.
The emulsification of amphiphilic polymer is inevitably affected by the salinity environment in the preparation and flooding process. Hase stands for hydrophobicallymodified alkali soluble emulsion. Hydrophobically modified alkali soluble emulsion composition with polymeric beads download pdf. Typical propertiesa viscosityb, 1% in water, mpas cps 9. Hase rheology modifiers retain the ph dependent behavior and easy handling advantages of their ase counterparts, but. The copolymer comprises a polyelectrolyte backbone bearing ethoxylate side chains capped with complex alkylaryl groups of a high molar volume.
Highly hydrophobic and highly hydrophilic methacrylic monomers were copolymerized in heterophase system via a miniemulsion analogous polymerization technique. In particular, nonlinear rheological properties have been studied for both associative hydrophobically modified ethoxylated urethanes and hydrophobically modified alkalisoluble emulsions. Request pdf hydrophobically modified alkali soluble emulsion polymers. Unlike synthetic associative rheology modifiers such as hydrophobically modified alkali soluble emulsions hase, natrosol he 3kb offers less sensitivity to ph, surfactants, and other paint additives.
The effect of hydroxyl ethyl cellulose hec and hydrophobically modified alkali soluble emulsions hase on the properties and quality of. The instantaneous effect on viscosity and easy incorporation of. The versatility of the approach was demonstrated by the direct synthesis of hydrophobically modified alkali soluble emulsions hase without the use of otherwise commonly required specialty monomers. Synthesis and application of stimuli responsive tunable. Like other hase modifiers, acrysol rm7 rheology modifier offers a nearly newtonian rheology profile with lower viscosity in lowshear conditions and higher viscosity in highshear conditions. When neutralized to a ph above 7 by adding alkalis, acusol 820 thickens instantly. By covalently grafting to a hydrophobically modified alkalisoluble emulsion hase, a thickening polymer, nanoparticles can be dispersed as gels in water at neutral ph. Hydrophobically modified watersoluble polymers, used by latex paint manufacturers as associative thickeners, provide significant advantages in improving film build and leveling, and decreasing spatter from rollerapplied paints.
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