Pressure-sensitive acrylic

Mangipudi et al. [63,88] reported some initial measurements of adhesion strength between semicrystalline PE surfaces. These measurements were done using the SFA as a function of contact time. Interestingly, these data (see Fig. 22) show that the normalized pull-off energy, a measure of intrinsic adhesion strength is increased with time of contact. They suggested the amorphous domains in PE could interdiffuse across the interface and thereby increase the adhesion of the interface. Falsafi et al. [37] also used the JKR technique to study the effect of composition on the adhesion of elastomeric acrylic pressure-sensitive adhesives. The model PSA they used was a crosslinked network of random copolymers of acrylates and acrylic acid, with an acrylic acid content between 2 and 10%. 

Uses Tackifier, binder, plasticizer for inks, textile sizes and finishes, latex modification, paints, adhesives adhesion promoter (acrylic pressure-sensitive adhesives) laminating heat sensitizer for rubber latex pigment binder in textile finishing protective colloid in emulsions flexibilizer, vise, control agent for photoresist coatings semiperme-able membranes (reverse osmosis plants) antistat, binder, film-former in cosmetics finish component for poly (phenyleneterephthalamide) food-pkg. resins in food-contact PU resins Regulatory FDA 21 CFR 175.105,177.1632,177.1680 Manuf/Distrib. Aldrich BASF ISP... 

Thomas Sanderson, "Water-Based, Acrylic Pressure-Sensitive Adhesives", Adhesives Age, 2, No. 12, 31 (1978). ... 

Journal of Applied Polymer Science 81, No.9, 29th August 2001, p.2109-17 EFFECT OF NETWORK MORPHOLOGY ON ADHESIVE PERFORMANCE IN EMULSION BLENDS OF ACRYLIC PRESSURE SENSITIVE ADHESIVES... 

Zollner, S., UV-curable acrylic pressure-sensitive adhesives. Features, Mechanisms, Milestones (pp. 543-549), Proc. RadTech Europe, Berlin, 1999. 

The results are reported of an investigation into the stability, in-vitro drug delivery and adhesive properties of drug-in-adhesive transdermal drug delivery systems. These systems are composed of a flexible backing film, a fluoropolymer release liner and active adhesives, which vary in their monomeric compositions and functionalities. The adhesives are composed of an acrylic pressure-sensitive adhesive, an amine-compatible silicone pressure-sensitive adhesive and methylphenidate base, as the drug. 4 refs. 

Six micrometre PEEK film has recently replaced polyethylene terephthalate (PET) as a cover film for thermal-acoustic and burn-through insulation. PET failed the new FAA flame performance tests and alternative materials such as PVDF and polyimides were too dense or not available in the required film thicknesses. The film is installed using PEEK tape coated in an acrylic pressure-sensitive adhesive. PEEK fibre also finds application in high-temperature acoustic blankets based on the Helmholtz resonator effect [2]. 

Lakrout, H., Sergot, P. Creton, C. (1999). Direct Observation of Cavitation and Fibrillation in a Probe Tack Experiment on Model Acrylic Pressure-Sensitive-Adhesives. Journal of Adhesion, Vol. 69, pp. 307-359, ISSN 0021-8464... 

Trim Labels, decals Acrylic pressure sensitives... 

The most important properties of any pressure sensitive adhesive are a balanced relationship of tack, cohesion, and adhesion. To these properties, acrylic pressure sensitives add the valuable qualities of heat resistance and resistance to aging and UV radiation. Another desirable characteristic of acrylics is that, in general, tackifiers are not required because tack can be designed into the polymer through the proper choice of acrylic monomers. These and other properties of acrylic pressure sensitive... 

Costanzo, J. A., and Gehman, D. R., Aqueous Acrylic Pressure Sensitive Adhesives for Labels and Overlays, TAPPI Conference (Fall, 1983). 

Pressure sensitive adhesive tapes are used for holding and anchoring lead wires to the outer wrap of transformer coils, capacitor wrapping, protection of leads and coils, and other similar applications. Adhesive transfer films are used to hold insulating material in position. Natural rubber based pressure sensitive adhesives have poor solvent resisitance unless they are cross-linked. Many modifications are possible. Synthetic rubber has better stability than natural rubber and better solvent and ozone resistance. Acrylic pressure sensitive adhesives have the best balance of properties. They maintain their... 

Body side molding acrylate pressure sensitive... 

Exterior holding adhesives (Table 2) are primarily of the acrylate pressure sensitive or neoprene solvent cement type. They are chosen because of their durability in service, their low temperature flexibility, and their speed and ease of use. Hot melts are used in exterior applications to a lesser exte nt, particularly in subassemblies such as lamp housings or vinyl roofing seams. 

Acrylic pressure-sensitive polymers consist mainly of a soft monomer with a low Tg and high Me. The three most common soft monomers are butyl acrylate, iso-octyl acrylate, and 2-ethylhexyl acrylate. All three have a Tg below —40°C and an Me above 15,000 Da see O Table 15.2. When polymerized on their own they meet the Dahlquist criterion at room temperature and well below. To increase peel, often a hard monomer is incorporated. These are high Tg monomers, and most are low Me. By moving up the Tg of the overall polymer, these hard monomers increase the viscous loss and thus the peel force, in much the same way as increasing the rate of peel. In addition, the lower Me hard monomers, such as MMA also increase the stiffness of the adhesive which further increases the peel force. Polar monomers are invariably incorporated to increase cohesive strength through intermolecular hydrogen... 

Acrylic monomers and their Tg, Me, and typical weight % addition into an acrylic pressure-sensitive adhesive... 

A further disadvantage of emulsion-based systems is the difficulty of drying them. The high heat of vaporization of water makes it impractical to dry films above 50 pm since inordinately long dryers would be required. Most emulsion acrylic pressure-sensitive adhesives are coated to about 25 pm thickness. 

Fig. 8-15 Peel strength of an acrylic pressure sensitive adhesive depending on the dwell time, according to W. Druschke [27].

Up to now, poly(methyl methacrylate) and methyl methacrylate copolymers e.g. with styrene, butyl acrylate and dodecyl methacrylate) have been the most widely used acrylic polymers for nanocomposite preparation by emulsion and suspension polymerization. Less research has been based on other acrylic polymers, such as polyacrylonitrile, poly(butyl acrylate), " poly(butyl methacrylate), poly(2-ethylhexyl acrylate), poly(2-hydroxyethyl methacrylate), polyacrylamide, poly(lauryl acrylate)," poly(butyl acrylate-co-styrene)," " poly(acrylonitrile-co-styrene), poly(acrylonitrile-co-meth-acrylate)," poly(ethyl acrylate-co-2-ethylhexyl acrylate)" and poly(2-ethylhexyl acrylate-co-acrylic acid)," and sometimes small amounts of hydophilic acrylic monomers, such as hydroxyethyl methacrylate, methacrylic acid and acrylic acid, have been used as comonomers. " Therefore, it may be stated that, so far, the preparation of acrylic-clay nanocomposites has been based mainly on high glass transition temperature polymers, although nanocomposite materials with lower glass transition temperatures with improved or novel properties, which exhibit a balance of previous antagonistic properties, can also be achieved and are very desirable. Regarding nanocomposites of low glass transition temperature polymers, such as poly(butyl acrylate), poly(ethyl acrylate) and poly(2-ethylhexyl acrylate), which have been utilized as the main components of acrylic pressure-sensitive adhesives, little information is available. 

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