Adhesives latex

Latex Adhesive Applications. Polychloroprene latex adhesives have a long history of use in foil laminating adhesives, facing adhesives, and constmction mastics. Increasingly stringent restrictions on the emission of photoreactive solvents has heightened interest in latex compounds for broader apphcations, particularly contact bond adhesives. Table 10 makes a general comparison of solvent and latex contact bond adhesives (158). 

Compounding is quite different for the two systems. The solvent base system is dependent on magnesium oxide and a /-butylphenoHc resin in the formulation to provide specific adhesion, tack, and added strength. Neither of these materials have proven useful in latex adhesive formulations due to colloidal incompatibihty. In addition, 2inc oxide slowly reacts with carboxylated latexes and reduces their tack. Zinc oxide is an acceptable additive to anionic latex, however. Other tackifying resins, such as rosin acids and esters, must be used with anionic latexes to provide sufficient tack and open time. 

The use of polychloroprene in solvent and latex adhesives has been the subject of a recent review (155). 

Hydrocarbon resins, rosin, rosin ester, coumarone indene resins, and terpene resins can be directly added to solvent-borne adhesives. For latex adhesives, resin emulsification must be produced before addition. 

Vulcanizing latex adhesives are used in the manufacture of textiles, rugs and carpets. The vulcanizing ingredients are sulphur, zinc oxide and accelerators (for example, zinc dibutyldithiocarbamate and zinc mercaptobenzothiazole to produce vulcanization at room temperature). 

Antioxidants. Similar antioxidants as for solvent-borne CR adhesives can be used. Addition of antioxidants is important when resins sensitive to oxidation are included in polychloroprene latex formulations. 2 phr is the common amount of antioxidant in latex adhesives. 

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. 

Gazeley. K.F. and Mente, P.G., Pressure-sensitive adhesives from modified natural rubber latex. Adhesives, Sealants and Encapsulants Conference, Kensington, London, 5th November, 1985. 

Polychloroprene latex adhesives, 1 533-534 Polychloroprene latexes, 19 854-861 applications for, 19 857, 859-861 compounding, 19 857-859 global product line of, 19 855 stabilization of, 19 855-857 Polychloroprene polymers branching parameters of, 19 839 commercial, 19 851-852 crystallization of, 19 843-844 cure site for, 19 837... 

Latex adhesives Latex adhesives are based on polymer latexes and require that the polymers be near their Tg so that they can flow and provide good surface contact when the water evaporates. It is not surprising that the same polymers that are useful as latex paints are also useful as latex adhesives (such as PMMA). Latex adhesives are widely employed for bonding pile to carpet backings. 

Adapted from Hodgson et al. (1993) D = dominant emission, + = observed, - = not observed. h SBR = styrene-butadiene rubber latex adhesive PVC = polyvinyl chloride. 

CA 68, 3093(1968) (Describes an expl tape approx 5 /8-inch wide fabricated by bonding together with a w-based latex adhesive 8 strands of textile covered detonating cord having a diam of ca 0.06-inch, the expl core of which contd 4 grains of PETN/ft and was enclosed in a textile braid. This tape has sufficient flexibility so that it can be folded back on itself or tied in knots at any point w/o cracking. 

Epoxy dispersions also can easily be blended with other waterborne polymers to make modified latex adhesives. The resulting hybrid adhesive produces performance properties and application characteristics that are superior to those of the originating latex system. 

In general, these groups of cellulose ethers have been used for their innate adhesive properties and to provide thickening to adhesive formulations. They are used for plywood adhesives, industrial adhesives, wallpaper paste, library paste, and latex adhesives. For example, methylcellulose is used in some adhesives as an additive to control viscosity, especially in the heat-cure phenol-formaldehyde glues and other hot-pressing adhesives. Hydroxyethylcellulose is used as an ingredient in polyvinyl acetate emulsions, where it acts as a thickener and protective colloid. 

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

Ziram wettable powder, to preserve starch and synthetic latex adhesives formulations against bacterial degradation. Also used in adhesives in dry wall construction. 

Woven, knitted and non-woven fabrics, carpets, paper, wood, wood products, latexes, adhesives, resins, paints, lacquers and varnishes. 

Continuous processes will generally not be used for acrylic surface coating latexes, adhesives, and other low tonnage products. Scmibatch processes are frequently used in which not all the ingredients are added initially. Continuous systems are favored for large-volume polymers like SBR in order to increase the reactor output and reduce fluctuations in product properties. Such continuous reactor trains usually consist of a series of batch reactors each connected with bottom inlets and top outlets and operated with continuous overflow. 

A latex adhesive is necessary to bond the tufts into the primary backing, adhere the individual fiber strands in the yarn tufts together so they don t separate and "piU at the carpet surface, and attach the secondary backing to this primary structure. This is accomplished almost exclusively by carboxylated styrene-butadiene latex containing 400 or more parts per hundred parts of rubber of a mineral filler. In addition to economics, this filler hel s provide density and stiffness to the carpet structure for the desired hand." Feld ar used to he the filler of choice, but less expensive calcium carbonate has replaced it in most instances. 

Muroi, S. High Polymer Latex Adhesives Kobunnshi-Kankokai Kyoto, Japan, 1984. 

Doubt has been cast on the existence of a true yield stress a long time ago, and it is usually Professor Reiner, who is quoted to have said everything flows if you wait long enough, some 60 years ago. Barnes and Walters found an apparently well-defined yield stress for PVA latex adhesives employing a shear strain... 

Keywords silane, crosslinking, hydrolysis, coating latex, adhesion promoter... 

Butadiene is used as a chemical intermediate and as a polymer component in the synthetic rubber industry, the latter accounting for 75% of the butadiene produced. Styrene-butadiene rubber, polybutadiene rubber, adiponitrile, styrene-butadiene latex, acrylonitrile-butadiene-styrene resins, and nitrile rubber are used in the manufacture of tires, nylon products, plastic bottles and food wraps, molded rubber goods, latex adhesives, carpet backing and pads, shoe soles, and medical devices. 

Plasticizer and adhesion promoter for polyvinyl acetate and other film-formers. Component in latex adhesives, paints, emulsion waxes, polishes, carpet backing, and variety of other formulations. 

Use (Rubber) Tires, hose, belting, and packing molded and extruded automotive and industrial products soles and heels hard rubber. (Latex) Adhesives, foamed rubber, textile and rug backing, paper coating and impregnation, modification of plastics to produce high-impact strength, asphalt additive. 

Residential carpets are continuing to be more visible in MSW. Carpets are quite complex with polyamide/PP/PET face libers, PP backing, latex adhesive, and calcium carbonate as tiller. In addition, the recycled carpet will have a higher amount of dust particles. There have been efforts in the United States to collect residential carpet. As it is very difficult to separate the different components of the carpet, the reasonable way is to shred the carpets and pelletize it so that the pellets can be used in products such as plastic lumber. Only a small percentage of the face materials (nylonb and nylon 66) are recovered and recycled. 

AF-. [Harwidk] Silicone emulsions or compds. antifoams for natural and synthetic latexes, adhesives, ptqxr, textile, leather t lics. 

Alcogum. [Alco] Polyacrylates thickener for latexes, adhesives, paints, paper coatings flocculant dye assistant... 

Amerstat . [Drew Ind. Div.] Combination of isothiazolin comp. antimicrobial, preservative in industrial water systems, latex, adhesives, oil recovery systems, metalworicing fluids sugar and paper mill slimicide. 

DensoL [Graden] Sulfates or block polymers tiuckena-, stabilizer, emulsifier, defoamer, (frs rsant wetting agent for latexes, adhesives, piqper, textiles. 

Naftonox . [Ore Chem. Cotp.] Antioxidants forrubbers, latexes, adhesives. 

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