Acrylic Construction Adhesives

The other major uses of acrylic latexes are in textile finishing (e.g., stain and wrinkle resistance), adhesives, and floor polishes and waxes. Adhesives are used in many applications, including pressure-sensitive tapes, contact adhesives, and construction adhesives for carpeting and floor tiles. Peelable labels and stamps probably got their start with the Post-it note, invented by Spencer Silver and Art Fry at 3M company many years ago. 

Adhesives. Acrylic emulsion and solution polymers form the basis of a variety of adhesive types. The principal use is in pressure-sensitive adhesives, where a film of a very7 low T (<—20° C) acrylic polymer or copolymer is used on the adherent side of tapes, decals, and labels. Acrylics provide a good balance of tack and bond strength with exceptional color stability and resistance to aging (201,202). Acrylics also find use in numerous types of construction adhesive formulations and as film-to-film laminating adhesives (qv). 

Hercules Res A. [Hercules] Resin dispersion tackifier for acrylic-latex polymers used in label, tape, and construction adhesives. 

Uses Acrylic, wet adhesion modifier in Portland cement-based construction compds. (mortars, surfacers, patching compds.) binder for architectural coatings... 

Adhesive acrylic monomer base, for acrylic plastics Adhesive, air-drying silicone rubber Adhesive, metallic structural honeycomb construction Adhesive, special rapid room-temperature curing, solventless... 

Functional monomers are used to improve the adhesive properties. One important functional monomer is acrylic acid. It strongly increases cohesion of PSA and improves compatibility with fiUers, such as CaC03, for construction adhesives. 

Uses Waterborne tackifierfor pressure-sensitive adhesives incl. food-pkg. adhesives, waterborne labels, decals, shelf liners, construction adhesives, tapes for carboxylated SBR, 2-ethylhexyl acrylate, butyl acrylic, SBR, NR, neoprene, VAE, urethanes defoamer in food-contact paper/paperboard waterborne for environmentally friendly adhesives... 

Examples of applied structural adhesive bonding in various machine structures are in the construction of the elevator and box applications of the Mitsubishi Electronic Corporation. The high bonding strength and ease of use of SGA (second generation acrylic resin adhesive) result in weight reduction and excellent architectural and structural beauty. 

Another important application area for PSAs in the electronic industry focuses on the manufacturing, transport and assembly of electronic components into larger devices, such as computer disk drives. Due to the sensitivity of these components, contamination with adhesive residue, its outgassing products, or residue transferred from any liners used, needs to be avoided. Cleanliness of the whole tape construction becomes very critical, because residuals like metal ions, surfactants, halogens, silicones, and the like can cause product failures of the electronic component or product. Due to their inherent tackiness, acrylic PSAs are very attractive for this type of application. Other PSAs can be used as well, but particular attention has to be given to the choice of tackifier or other additives needed in the PSA formulation. The choice of release liner also becomes very critical because of the concern about silicone transfer to the adhesive, which may eventually contaminate the electronic part. 

The dependence of release force on the flexibility of the release layers is noted in systems other than silicones. Recent work in olefin release shows that release is a strong function of the density or crystallinity of the layer [44], At a density above 0.9 g/cm release for an acrylate PSA is greater than 270 g/cm. However, when the density of PE is dropped to 0.865 g/cm-, the release force of the same adhesive construction drops to 35 g/cm. An investigation of interfacial friction and slip in these systems has not yet been reported, but again the manipulation of release rheology greatly impacts the measured peel force. 

The important role Transmission Electron Microscopy (TEM) can play in this process is demonstrated on the development of an oxidation catalyst for the production of acrylic acid. Acrylic acid is produced by BASF in quantities of several 100.000 tons per year in a two step gas phase oxidation process starting from propene, which is oxidised to acrolein in the first step and then further oxidised to acrylic acid in a second step, each step requiring a special developed catalyst. Acrylic acid is used as a base material for the production of superabsorbents for nappies, dispersions and emulsions for adhesives and construction materials. 

The use of such an ethylene/acrylate copolymer provides a number of advantages. The ethylene portion of the copolymer is particularly well suited for adhering to the PE of the first polymer layer during fusion of the first polymer layer and the second polymer layer to one another. Further, the acrylate portion of the copolymer is particularly well suited for adhesion to bone cement, such as bone cement that includes poly(methyl methacrylate). Thus, using such a copolymer in the construction provides for ease of implantation in regard to a bearing designed for cement fixation. 

Another class of acrylic sealants arc the solvent-releasing acrylics. Acrylic monomers are polymerized in a solvent. The natural adhesion of most of the solvent-releasing acrylics produces some of the best unprimed adhesion in the sealant industry. However, slow, continual cure generally produces large compression sets and limits their use to low movement applications. Also, the relatively high amounts of solvent and traces of acrylic monomer in these formulations limits their use to outdoor applications, usually in construction,... 

Another type of important linear polymers are the acrylates and methacrylates. In Figure 2.35, the repeating unit with two side groups from which these polymer types are derived is shown [195,197]. In Table 2.3, three examples of this type of polymers, specifically, poly (ethyl acrylate), which is applied in paints poly (methyl methacrylate), which is applied fundamentally as a construction material in place of glass and poly (ethyl methacrylate), which is applied as adhesives, are reported. 

MIL-A-8576 MIL-A-9117 MIL-A-12850 MIL-C-14064 MIL-C-15705 MIL-C-18255 MIL-C-18969 MIL-C-23092 MIL-C-27315 MIL-C-27725 MIL-C-5539 MIL-C-7438 Adhesive, Acrylic Monomer Base Synthetic Elastomeric Sealant Natural Liquid Rubber Cement Grinding Disk Cement Caulking Compound Caulking Compound with Synthetic Rubber Base Caulking Compound—Watertight Exterior Hull Seams of Vessels Cement, Natural Rubber Coating Systems, Elastomeric Coating, Corrosion, Preventative, Air Fuel Tanks Natural Rubber Cement Core Material, Aluminum, for Sandwich Construction... 

In this book I have confined discussion to those polymeric materials which are cured by chemical reaction and which have found widespread application in the construction industry. As such, the book covers materials based on epoxies, polyurethanes, silicones, polysulphides, alkyds and polyesters. In addition, there is a chapter on hybrid polymer systems and one on acrylics. It is true that acrylic emulsions are not strictly thermosetting polymer systems, but their widespread use and importance made their exclusion difficult. These materials find use as coatings, sealants, adhesives, grouts, flooring compounds, repair compounds and waterproofing agents. 

Lavelle, J.A. (1986) Acrylic latex modified portland cement, paper presented at the American Concrete Institute, Baltimore, MD published by Rohm Haas, Philadelphia, PA. Panek, J.R. and Cook, J.P. (1984) Construction Sealants and Adhesives, John Wiley, New York, pp. 138-43. 

The Adhesive The choice of the proper adhesive for one s label is quite obviously of major importance. The two t3rpes of adhesives generally used for pressure sensitive label construction are rubberbase and acrylic emulsion. In addition, most converters of label stock offer a variety of specialty adhesives to meet particularly demanding applications. Some of the terminology associated with pressure sensitive adhesives is as follows. 

Shrinkage. The results in Table 4 show that the shrinkage of AM resins is less than the epoxy acrylate control. It has been reported that for UV Curable coatings used in mirror construction, it is desirable for good adhesion to have coatings with leas than 10... 

Poly sulfide rubber was first produced in 1929, and the liquid polymers were used in sealants and as flexibilizers for epoxy adhesives around 1950. In 1952 the polysulfide sealant was introduced to the construction industry [11, p. 74]. In the 1950s the first butyl rubber caulks appeared in the construction market [11. p. 108] and latex caulks [vinyl acrylic and poly(vinyl acetate)] appeared sometime after 1956. 

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