Alkali-swellable

Hydrophobically Modified Alkali-Swellable Emulsions. The hydrophobe modification of acryHc acid represents an important class of... [Pg.320]

Preparation and Characterization of Alkali-Swellable Carboxylated Latexes... [Pg.291]

Alkali-swellable polymer compositions consisting of acrylic acid, methyl methacrylate, behenyl methacrylate, lauryl methacrylate, and sodium lauryl sulfate were prepared by Tamareselvy [2] and used as a hair rheology modifier and as a hair setting agent. [Pg.130]

FIG. 5.3 Measured flow curves for aqueous solutions of four common types of rheology modifiers. ASE is an alkali swellable/soluble emulsion-type rheology modifier and HASE is a hydrophobically modified alkali-soluble emulsion. [Pg.117]

HASE, hydrophobically modified alkali-soluble emulsion x-ASE, crosshnked alkali swellable/soluble emulsion. [Pg.122]

The subject of surfactant-modified, water-soluble polymers, briefly discussed in Water-Soluble Polymers, is addressed in the last three sections (Chapters 16-28) of this book. These associative thickeners are covered in detail, ranging from the maleic acid copolymers of variable compositions introduced in various commercial markets in the early 1960s to the most recent entries (that is, in the open literature), hydrophobe-modified poly (acrylamide). Chapter 23 is complementary to the spectroscopic studies in Chapters 13-15 it explores new approaches to understanding associations in aqueous media. The three hydrophobe-modified polymers that have gained commercial acceptance in the 1980s, (hydroxyethyl)cellulose, eth-oxylate urethanes, and alkali-swellable emulsions, are discussed in detail. In particular, hydrophobe-modified (hydroxyethyl)cellulose, which is... [Pg.1]

The two associative thickeners examined in the remainder of this text whose synthesis has not been discussed are hydrophobe-modified alkali-swellable emulsions (HASE) discussed in Chapters 25, 27, and 28, and hydrophobe-modified (hydroxyethyl)cellulose (HMHEC, discussed in Chapters 17, 18, and 27). HASE thickeners, by far the lowest cost hydrophobe-modified thickeners produced, should have achieved the largest market share on the basis of cost of production, but this situation does not appear to be the case (discussed in Chapter 28) in large part because of the poor properties observed with the lowest cost latex, vinyl acetate, used to form the continuous film. The applied-film properties 46) of vinyl acetate can be substantially improved through the use of HEUR polymers. HMHEC, synthesized by a matured (30-year-old) commercial slurry process (47) has achieved commercial acceptance, in large part because of linear high shear rate viscosities achieved in blends with HEUR thickeners (Chapter 27). [Pg.162]

The industrial problems limiting earlier industrial thickeners in the coatings area were overcome with HEUR thickeners. With increasing sales, production limitations were addressed and the batch processes were replaced with semicontinuous techniques. Hydrophobe modification of industry standards (hydroxyethylcellulose and alkali-swellable emulsions) produced by proven industrial processes entered the market and broadened the technology. [Pg.162]

Alkali Swellable and Alkali-Soluble Thickener Technology... [Pg.457]

Alkali-swellable and alkali-soluble thickeners (asts), as defined herein, are carboxyl functional copolymers produced by the free-radical polymerization of ethylenically unsaturated monomers. The copolymers are substantially insoluble in water at low pH, but exhibit thickening on swelling or dissolution in aqueous media at higher degrees of ionization. In their ionic form (partially or fully neutralized), ASTs generally belong to the broad... [Pg.457]

The AST process receiving the greatest industrial and academic attention by far has been that of emulsion polymerization, and because of the relative importance of the emulsion thickeners, these polymers will be the object of considerable discussion in this review. When conventional ASTs are specifically prepared by this process, alkali-swellable or alkali-soluble emulsions (ASE) are obtained. For conventional ASTs produced by processes other than emulsion polymerization (nonemulsion), the acronym ASNE has been adopted herein. The associative ASTs have analogous designations. HASE is the common acronym for hydrophobically modified, alkali-swellable or alkali-soluble emulsion, and HASNE is the adopted acronym for the associative nonemulsion thickeners. The family of AST polymers reflecting this classification scheme is shown in Figure 2. [Pg.461]

Figure 2. Classification scheme for the family of alkali-swellable and alkali-soluble thickeners (AST). All acronyms are defined in the text and in the list of Symbols and Abbreviations.

Shay Alkali-Swellable and Alkali-Soluble Thickener Technology and Improvement Claims in AST Patents... [Pg.483]

The thickener is an encapsulated alkali-swellable polymer (EASP) dispersion. [Pg.489]

ASNE Alkali-swellable or alkali-soluble nonemulsion... [Pg.490]

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