Styrene acrylic latex properties

The control and reproducibility of particle size and particle size distribution is important to the quality of acrylic and styrene-acrylic latex products. Particle size has large effects on latex viscosity and the rheology of formulated products and may also exert subtle effects on the end-use peiformaiKe properties. The particle size is controlled primarily by the choice and amount of surfactant, or by the use of seed latexes. A recoit article [32] addresses the use of surfactants to control particle size in semi-continuous acrylic polymmzations. Many surfactants are reconunended by surfactant manuhicturras for the preparation of acrylic and styrene-acrylic latexes [33]. Sodium lauryl sulfate, sodium dodecylbenzene sulfonate, sulfosuccinates and the aUtylphonl ethoxylates ate typical. The patent literature contmns many discussions of the use of single [34] or multiple [3S] polymer seed latexes to control particle size. 

Bragaiifa et al. [97] showed the importance of the clay lamellar intercalation and exfoliation to define the material mechanical properties of nanocomposites. In this study, montmorillonite clay with different interlamellar cations (NaL Li+, K+, and Ca +) was mixed with styrene-acrylic latex and dried to produce nanocomposites. An ultra-thin cut of the sample was analyzed by ESI-TEM. The elemental maps of carbon, silicon, and calcium were used to identify the polymer, clay, and cation domains, as presented in Fig. 8.13. 

Emulsifier for the generation of very fine particle size vinyl acetate, acrylic and styrene-acrylic latexes. Resulting films have superior water-resistant properties. 

Polymer Areas Primary emulsifier for acrylic, vinyl acetate and styrene-acrylic latexes. Very fine particle size emulsions with excellent water-resistant properties. 

Bauer et al. describe the use of a noncontact probe coupled by fiber optics to an FT-Raman system to measure the percentage of dry extractibles and styrene monomer in a styrene/butadiene latex emulsion polymerization reaction using PLS models [201]. Elizalde et al. have examined the use of Raman spectroscopy to monitor the emulsion polymerization of n-butyl acrylate with methyl methacrylate under starved, or low monomer [202], and with high soUds-content [203] conditions. In both cases, models could be built to predict multiple properties, including solids content, residual monomer, and cumulative copolymer composition. Another study compared reaction calorimetry and Raman spectroscopy for monitoring n-butyl acrylate/methyl methacrylate and for vinyl acetate/butyl acrylate, under conditions of normal and instantaneous conversion [204], Both techniques performed well for normal conversion conditions and for overall conversion estimate, but Raman spectroscopy was better at estimating free monomer concentration and instantaneous conversion rate. However, the authors also point out that in certain situations, alternative techniques such as calorimetry can be cheaper, faster, and often easier to maintain accurate models for than Raman spectroscopy, hi a subsequent article, Elizalde et al. found that updating calibration models after... 

This latex is then processed to isolate the ABS resin, ABS thermoplastic combines good mechanical properties and heat resistance. It is used in many household appliances, automotive parts, furniture, etc. Another similar terpolymer is acrylonitrile-styrene-acrylate (ASA). It is used in automobile industry, in house construction, household appliances, etc. 

It has been proved that incorporation of carboxylic acid groups in the polymeric chain has a significant effect on colloidal properties of latex, processability, and end-use property. Carboxylated styrene-butadiene latexes (XSBR) are prepared via batch emulsion copolymerization with different amounts of acrylic acid in the absence of emulsifier. They are among the most important polymeric colloids, and can be used as binder in paper coatings, carpet backing, paints, and nonwoven. There are several studies on the preparation and properties of XSBR latexes. 

The effect of structural memory in a wave field has been exsemplarily studied by the IR-spectroscopy method on films made from mixtures of butadiene-styrene and acrylic latex as models of polymeric membranes. The strengthening of the interphase interaction in heterophase systems that can cause change of their local and transmitting mobility has been observed. It has been shown, that the response of polymeric dispersed systems and compositions on influence of nonlinear vibrations proves their influence on deformation properties, like orientation phenomena in solid polymers (where Rebinder s effect can take place) that it is possible to consider as a way of polymer modifications, including the obtaining of nanicomposites, polymeric biocarriers, etc. 

Y. Ohama, K. Demura, M. Hamatsu and M. Kakegawa Properties of polymer-modified mortars using styrene-butyl acrylate latexes with various monomer ratios. ACI Materials Journal Vol.88, No.l (1991), pp.56-61. 

Chem. Descrip. Hydrophobe modified ethoxylate Uses Rheology control agent, associative thickener for latex systems, high gloss and semi-gloss coatings, waterborne architectural and industrial paints, printing inks, suitable for acrylics, styrene-acrylics Properties Clear liq. dens. 8.75 Ib/gal vise. 1800 cps VOC 20% (EPA Method 24) 40% act., 40% water Use Level 1.0-3.0% on total wt. 

Chem. Descrip. Nonoxynol-8 CAS 9016-45-9 EINECS/ELINCS 248-293-6 Uses Pigment dispersant emulsifier for polymerization (styrene acrylic, acrylic, vinyl acrylic, S/B, paints, coatings) contributes mech. and freeze/ thaw stability to latexes food pkg. adhesives, paper emulsifier in mfg. of food-contact articles Features Allows control of particle size Regulatory FDA 21CFR 175.105,176.180,178.3400 Properties Water-wh. to pale yel. clear liq. water-sol. nonionic 100% act. 

Chem. Descrip. Branched sodium dodecylbenzene sulfonate CAS 25155-30-0 EINECS/ELINCS 246-680-4 Uses Emulsifier for emulsion polymerization (SBR, vinyl acetate, vinyl chloride, styrene, and acrylic latexes), paints/coatings emulsifier, dispersant for agric. formulations surfactant for washing fruits and vegetables food pkg. adhesives, paper defoamer in food-contact paper/ paperboard emulsifier in mfg. of food-contact articles Regulatory FDA 21 CFR 175.105,175.300,175.320,176.170,176.180, 176.200,176.210,178.3400 exempt from tolerance under EPA40CFR 180.1001 (c) (e) BGA XIV compliance Properties Flakes pH 6.0-9.5 (10%) surf. tens. 32 dynes/cm ( CMC) anionic 98% act. 

Acryiic Resin AS. See Acrylic resin Acrylic resin. See Polyacrylic acid Acrylic sheet. See Acrylic resin Acrylic/styrene/acrylonitrile terpolymer Synonyms Acrylonitrile/styrene/acrylate Acrylonitrile-styrene-acrylic ester copolymer ASA ASA terpolymer Definition Thermoplastic blend produced by polymerization of acrylonitrile and styrene in presence of acrylic ester latex Properties Dens. 1.08 kg/l (20 C) tens. str. 50-60 MPa tens. mod. 2500 MPa better heat and It. resist, than ABS... 

Abad C, De La Cal J.C, Asua J.M (1995) Core-shell Structured Latex Particles. IE. Structure-properties Relationship in Toughening of Polycarbonate with Poly(M-butyl acrylate)/Poly(benzyl methacrylate-styrene) Structured Latex Particles. J. Appl. Polym. Sci. 56 419-455. 

There are a wide variety of acryhc monomers available, each having specific properties. Styrene is often used as a comonomer in acrylic latexes because of its compatibility and wide availability. Auxiliary monomers can be used in small amounts to impart special properties to toe latex. Although acrylic monomers and styrene may be similar in reactivity, if toe monomer solubilities are significantly different, copolymerisation is less likely, possibly resulting in structured particle morphologies. The copolymer composition can be made more uniform by semi-continuous polymerisation. In some cases, a stmctured morphology is desired, and can be designed into toe process (225, 372). 

Latex The film forming resin which acts as the binder between the pigment particles and the substrate. Ethylene/vinyl acetate and styrene/acrylic polymers are well known, and additional monomers are sometimes utilised to obtain the optimum film forming, durability and gloss properties. 

It has been demonstrated that AMPS Monomer can be an effective partial replacement for siufactants and other water-soluble monomers in three common types of latex formulations acrylic, vinyl acrylic and styrene acrylic. Improved latex properties and improved scrub resistance of coatings prepared from these latices have been demonstrated. 

Figure 5. Effect of monomer feed profile on the dynamic mechanical properties of model 50/50-styrene/ethyl acrylate latexes. A. Uniform feed B. Two-stage process with stage I-EA, stage II-STY C.

Among binders, styrene-butadiene latexes dominate beside modified starches. Styrene-acrylate dispersions are spedalties and of high importance for impressive prints. Additionally acrylate dispersions have an excellent brightness and ageing resistance and are less odorous. Future requirements of coating process conditions, on paper characteristics and printing technologies forced the production of tailor-made binders with very specific property profiles. 

Uses Emulsifier in vinyl acrylic polymers made by redox or fhermal processes also effectively used in acrylic and styrene acrylic polymers food-pkg. adhesives Features Exc. latex stability without need for protective colloid low VOC surfactant alternative for environmentally sensitive requirements Regulatory FDA 21CFR 175.105 BGA XIV compliance Properties Liq. surf. tens. 46.0 dynes/cm 30% act. 

Uses Surfactant for emuision poiymerization of wide range of polymers incl. SBR, vinyl acetate, vinyl chloride, styrene and acrylic latexes food-pkg. adhesives defoamer in food-contact paper/paperboard in food-contact rubber articles Regulatory FDA21CFR 175.105,176.210,177.2600 Properties Cl. liq. vise. 1500 cps pH 7-8.5 (10% soi n.) 22-24% act. 

Uses Emulsifier for vinyl acetate homo and copolymers, acrylate homo and copolymers, styrene-acrylate, S/B latexes, vinyl propionate copolymers, PVdC, vinyl chloride homo and copolymer latexes food-pkg. adhesives, paper/paperboard Regulatory FDA21CFR 175.105,176.180, EGA approved Properties Yellowish liq. odorless unlimited sol. in water sp.gr. 1.06 pH 7-8.5 (100 g/l water) 30-35% solids Toxicology Eye irritant... 

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