Thickeners polyacrylates

Thickener (polyacrylate) as required Waterproof Part A Part B... 

Suitable protective coUoids for the preparation of acryhc suspension polymers include ceUulose derivatives, polyacrylate salts, starch, poly(vinyl alcohol), gelatin, talc, clay, and clay derivatives (95). These materials are added to prevent the monomer droplets from coalescing during polymerisation (110). Thickeners such as glycerol, glycols, polyglycols, and inorganic salts ate also often added to improve the quahty of acryhc suspension polymers (95). 

Thickeners can be added to increase the viscosity of the NR adhesives. Natural materials can be used such as casein or karaya gum, but currently synthetic polymers are used (methyl cellulose and derivatives, polyacrylates). 

Thickeners. Thickeners increase the viscosity of the polychloroprene latex adhesives. Amounts up to 1% of polyacrylates, methyl cellulose, alginates and polyurethane thickeners can be used. Particular attention should be paid to fluctuations in pH when thickener is added in the formulations. For low-pH (7-10) formulations, fumed silica or some silicates can be used. 

Synthetic products, e.g., polyethylene oxides(104), polyacrylates, polyacrylamides, and polyetherglycols were in competition with natural polymers like starch, guar, cellulose derivatives, alignates, carrageenan, and locust bean gum. The basic physical and structural properties of the various polysaccharide thickeners have been compiled and reviewed by numerous authors and editors(105-109). 

Use anionic polymers such as polyacrylic acids cross-linked with allyl ethers of pentaerythritol or sucrose as thickeners, if a gel structure and pseudoplastic (shear-thinning) properties are desirable. Consider adding colloidal alumina to further increase the viscosity at pH 13 [ 15]. 

When hydrolyzed in water, the resulting diacid exhibits two pKs ( 3 and 8) the half ester as expected has one pKa typical of polycarboxylic acids. A cross-linked version of this polymer, referred to as Stabileze, thickens a variety of formulations by expanding its hydrodynamic volume when neutralized. Because of the low pKa of the vicinal diacids, Stabileze acquires a negative charge at lower pH than competitive cross-linked polyacrylic acids (carbomers). This allows for efficient thickening at lower pHs similar to that found on moist skin, which in turn allows products to perform at optimum pH as desired by skin-care product formulators (63). 

ALCOGUM 6625 is a sodium polyacrylate thickener which finds extensive use in the thickening of natural and synthetic latexes for a wide variety of applications. 

ALCOGUM 9635 is a sodium polyacrylate thickener suitable for use in latex adhesives for the tufted carpet industry. 

ALCOGUM 9639-N is a new sodium polyacrylate thickener designed for use in textile coatings for upholstery. 

ALCOGUM 296-W is recommended primarily as a stabilizer, protective colloid, and thickener for water based systems, such as natural and synthetic rubber latices, and polymeric dispersions, such as polyvinyl acetate and polyacrylate emulsions. It possesses unique adhesive, suspending, emulsifying, and film-forming characteristics, making it ideal for any other industrial uses. 

ALCOGUM VEP-I is a CAD designed sodium polyacrylate thickener. Its unique manufacturing process ensures a clean product. 

Polyacrylic thickening agent for pigment printing. Can be used in emulsion systems but specially developed for use in completely aqueous systems. 

Polyacrylic thickening agent for pigment printing. Specially developed for fully aqueous systems but may also be used in part emulsion systems. Does not require the addition of ammonia. 

Modified Polyacrylic thickening agent for pigment printing. Eliminates flushing and poor fine line definition on pre-resinated, badly prepared, or synthetic filament fabrics. This product overcomes most of the problems associated with the gelling of pigment blacks. 

Polyacrylic thickening agent for printing with reactive dyes. 

An ammonium polyacrylate solution recommended for thickening synthetic and natural latices. Can be used as supplied to produce thickened latices of a smooth consistent texture. Not sensitive to sodium, calcium, and magnesium ions. Also recommended as a pigment antimigrant. 

Polyacrylic thickening agent for aqueous polymer emulsions and latex dispersions backing of plush and carpets improves antistatic properties. 

Several examples of W/O emulsions and W/O/W multiple emulsions based on the block copolymer of PHS-PEO-PHS, have been produced. As an illustration, a typical formulation of W/O/W multiple emulsion is described below, using two different thickeners, namely Keltrol (xanthan gum from Kelco) and Carbopol 980 (a crosshnked polyacrylate gel produced by BF Goodrich). These thickeners were added to reduce creaming of the multiple emulsion. A two-step process was used in both cases. 

Toussaint, Oldenhove, Broze Colgate Light-duty liquid composition containing gelatin beads and polyacrylate thickener Stably suspended oil containing gelatin beads with a polyacrylate polymeric thickener... 

Currently, products in the market are thickened mainly by polyacrylic acids, although some use a mixture of polymer and a clay. This is in contrast to the early LADD products, which used exclusively clay thickeners and therefore suffered from stability problems [7], The products, being clay suspensions in an aqueous medium, tended to separate in a relatively short period of time. The introduction of bleach-compatible polymeric thickeners in the early 1990s overcame this problem [75],... 

U.S. 4941988 (1990) [51] Wise (Procter Gamble) Polyacrylate thickener and alkali metal silica colloid optimized thickening system ... 

If nondeionized water is used, product viscosity remains low and a thickener must be incorporated. Excellent thickening effects have been obtained with nonionic cellulose derivatives, cationic guar gum, or crosslinked cationic polyacrylates. 

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