Acrylate ester copolymer latex

Wide angle light scattering is used as the principal probe to examine the core-shell structure proposed for certain acrylic acid acrylate ester copolymer latexes. Additional techniques were sedimentation and photon correlation spectroscopy. 

Copolymerization. Vinyl chloride can be copolymerized with a variety of monomers. Vinyl acetate, the most important commercial comonomer, is used to reduce crystallinity, winch aids fusion and allows lower processing temperatures. Copolymers are used in flooring and coatings. This copolymer sometimes contains maleic add or vinyl alcohol (hydrolyzed from the poly(vinyl acetate ) to improve the coating s adhesion to other materials, including metals, Copolymers with vinylidene chloride are used as barrier films and coatings. Copolymers of vinyl chlonde with acrylic esters in latex from are used as film formers in paint, nonwoven fabric binders, adhesives, and coatings. Copolymers with olefins improve thermal stability and melt flow, but at some loss of heat-deflection temperature,... 

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... 

AH-acryHc (100%) latex emulsions are commonly recognized as the most durable paints for exterior use. Exterior grades are usuaHy copolymers of methyl methacrylate with butyl acrylate or 2-ethyIhexyl acrylate (see Acrylic ester polymers). Interior grades are based on methyl methacrylate copolymerized with butyl acrylate or ethyl acrylate. AcryHc latex emulsions are not commonly used in interior flat paints because these paints typicaHy do not require the kind of performance characteristics that acryHcs offer. However, for interior semigloss or gloss paints, aH-acryHc polymers and acryHc copolymers are used almost exclusively due to their exceUent gloss potential, adhesion characteristics, as weU as block and print resistance. 

Almost all synthetic binders are prepared by an emulsion polymerization process and are suppHed as latexes which consist of 48—52 wt % polymer dispersed in water (101). The largest-volume binder is styrene—butadiene copolymer [9003-55-8] (SBR) latex. Most SBRlatexes are carboxylated, ie, they contain copolymerized acidic monomers. Other latex binders are based on poly(vinyl acetate) [9003-20-7] and on polymers of acrylate esters. Poly(vinyl alcohol) is a water-soluble, synthetic biader which is prepared by the hydrolysis of poly(viayl acetate) (see Latex technology Vinyl polymers). 

So-called pure acryUc latexes are employed for maximum durabiUty as required, for example, in high performance exterior latex paints. On the other hand, interior flat wall latex paints do not need the high resistance to exterior exposure and hydrolysis. The most widely used latexes for this appHcation are vinyl acetate copolymer latexes such as vinyl acetate/butyl acrylate (2-propenoic acid butyl ester) [141-32-2] copolymers having just sufficient... 

The formation of coagulum is observed in all types of emulsion polymers (i) synthetic rubber latexes such as butadiene-styrene, acrylonitrile-butadiene, and butadiene-styrene-vinyl pyridine copolymers as well as polybutadiene, polychloroprene, and polyisoprene (ii) coatings latexes such as styrene-butadiene, acrylate ester, vinyl acetate, vinyl chloride, and ethylene copolymers (iii) plastisol resins such as polyvinyl chloride (iv) specialty latexes such as polyethylene, polytetrafluoroethylene, and other fluorinated polymers (v) inverse latexes of polyacrylamide and other water-soluble polymers prepared by inverse emulsion polymerization. There are no major latex classes produced by emulsion polymerization that are completely free of coagulum formation during or after polymerization. 

Ethylhexyl acrylate manufacture represented about 15 percent of domestic consumption of the alcohol. The acrylate is the longest chain acrylate ester produced by esterification of acrylic acid. The monomer is used in acrylic copolymers for pressure sensitive adhesives, PVC impact modifiers, and as a comonomer with vinyl acetate and vinyl chloride in latexes for paints and textiles. Growth over the next 5 years is estimated at 6 percent per year. 

Vinyl Acetate, Homo- and Copolymer Latexes Vinyl Acetate Comonomer (butyl acrylate, ethylene, vinyl ester of versatic add) Partially Hydrolyzed Polyvinyl Alcohol Sodium Bicarbonate Hydrogen Peroxide (35%) Sodium Formaldehyde Sulfoxylate Water 70.0-100.0 0.0-30.0 6.0 0.3 0.7 0.5 80.0... 

Branched vinyl esters are strongly resistant to saponification, water absorption and UV degradation. Combining them with VAc and/or acrylate esters affords copolymers with improved water and alkali resistance, and exterior durability. Typically, about 15-30% VV-10 is used to optimize the cost-performance properties of such polymers. Intericn- latexes tend to contain 15-20% monomer. Exterior latexes usually contain 20-30% of the branched monomer. 

Research on the effect of monomer ratio in copolymer dispersions [e.g., SBR latex, poly (ethylene-vinyl acetate) (EVA) and poly (styrene-acrylic ester) (SAE) emulsions] on the strength of polymer-modified mortar using copolymer dispersions [21-23]... 

One of the most important groups of film forming latexes used in waterbourne coatings is the group of acrylic resins. These are for the most part, the polymers obtained from acrylate and methyl acrylate esters of lower alcohols, of which methanol and butanol have the widest application. Those based on MMA and butyl acrylate (BA) yield copolymers with good film properties [81]. 

Vinyl acetate (VAc) (acetic acid ethenyl ester) [108-05-4] is less expensive than (meth)acrylate monomers. VAc latexes are inferior to acrylic latexes in photochemical stability and resistance to hydrolysis and are used in flat wall paints. Reference 119 discusses use of a variety of vinyl esters in latexes. The polymers are more hydrophobic than VAc homopolymers and have superior hydrolytic stability and scrub resistance. Reference 120 reports the advantages of using vinyl versatate in both VAc and acrylic copolymers. 

Water based latex emulsions consist of fine particles of high molecular weight copolymers of polyvinyl chloride, or polyvinyl acetate, acrylic esters, styrene-butadiene, or other resins combined with pigments, plasticizers, UV stabilizers, and other ingredients. A variety of thickeners, coalescing aids, and other additives are present in the water phase. 

The monomers which have been investigated include methyl methacrylate, ethyl acrylate ester, hydroxy acrylates and methacrylates, acrylonitrile, vinyl acetate, vinyl chloride, acrylamide, vinylidene chloride, acrylic acid, vinyl pyrollidone and styrenec Many copolymer latexes of these monomers have also been preparedc Undoubtedly the most amenable system for model studies is methyl methacrylate in aliphatic hydrocarbono... 

The resins used are polymers and copolymers of the esters of acrylic and methacrylic acids. They range in physical properties from soft elastomers to hard plastics, and are used in cementitious compounds in much the same manner as SBR latex. Acrylics are reported to have better UV stability than SBR latex and therefore remain flexible under exterior exposure conditions longer than SBR latex [88]. 

Latex copolymers including NIBA have found applications in protective coatings, binders for nonwoven fabrics, water and oil repellancy, crease resistance, print pastes, leather finishing, adhesives, paper impregnation, curable thickeners and elastomers. (2B). Comonomers include acrylic and methacrylic esters, acrylo nTtrile, styrene, and occasionally vinyl acetate or vinyl chlorida... 

Polymers with pendant cyclic carbonate functionality were synthesized via the free radical copolymerization of vinyl ethylene carbonate (4-ethenyl-l,3-dioxolane-2-one, VEC) with other imsaturated monomers. Both solution and emulsion free radical processes were used. In solution copolymerizations, it was found that VEC copolymerizes completely with vinyl ester monomers over a wide compositional range. Conversions of monomer to polymer are quantitative with complete incorporation of VEC into the copolymers. Cyclic carbonate functional latex polymers were prepared by the emulsion copolymerization of VEC with vinyl acetate and butyl acrylate. VEC incorporation was quantitative and did not affect the stability of the latex. When copolymerized with acrylic monomers, however, VEC is not completely incorporated into the copolymer. Sufficient levels can be incorporated to provide adequate cyclic carbonate functionality for subsequent reaction and crosslinking. The unincorporated VEC can be removed using a thin film evaporator. The Tg of VEC copolymers can be modeled over the compositional range studied using either linear or Fox models with extrapolated values of the Tg of VEC homopolymer. 

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