Butyl acrylate/methyl methacrylate latexes: adhesive properties

Abstract

In this study, butyl acrylate/methyl methacrylate (BA/MMA) latexes of bimodal molecular weight and particle size distribution were prepared in a multi‐step process by seeded conventional emulsion and seeded miniemulsion polymerization. For the conventional emulsion case, a BA/MMA batch copolymerization was conducted as a first step (seed generation) and was followed by a monomer addition step to ensure particle growth. In a third step, a BA/MMA pre‐emulsified mixture was added to generate a second particle population. For the miniemulsion case, a BA/MMA copolymerization was carried out as a first step (seed generation) and was followed by a monomer addition step. The addition of a BA/MMA miniemulsion served to generate a bimodal particle size and molecular weight distribution. The final latexes were coated onto a polyethylene terephthalate carrier, dried and their performance as pressure‐sensitive adhesives was evaluated using tack, peel and shear adhesion measurements. Structure‐property relationships between the adhesive properties and the weight‐average molecular weight and average particle size were examined. Even though the polymers obtained by miniemulsion showed better shear resistance, their shear resistance was low. There was no statistically significant difference in peel resistance of the polymers obtained by the two reactions. While a significant difference in tackiness between the two emulsion procedures was found when the adhesives were tested using the less sensitive, rolling ball test, no differences were found when they were tested using a loop tack test.

Butyl Acrylate/Vinyl Acetate Miniemulsion Polymerization: A Study on Compartmentalization

“…acrylic or methacrylic acid) and some multifunctional monomer(s). Despite these observations, given appropriate conditions, the idea of mixing particles as carriers of different relevant properties is still intriguing 27…”

The influence of the polymerization on properties of an ethylacrylate/2-ethyl hexylacrylate pressure-sensitive adhesive suspension

“…Inherent properties, such as copolymer composition and microstructure, MW and MWD are among the most influential parameters affecting the PSA properties [3]. An important problem regarding the use of the acrylic monomer system is the formation of a gel phase during the polymerization process [5].…”

“…The adhesion properties of any PSAs are characterized via measurements of three basic applicative properties: tack (the ability to adhere quickly), peel strength (the ability to resist removal by peeling), and shear resistance (the ability to resist flow when shear forces are applied). The selection of monomers for the synthesis is dictated by the intended application of the PSA and the desired end-product properties [3]. For microsphere suspension-based PSA synthesis, two basic monomers are used: 2-ethylhexylacrylate (2-EHA) and isooctyl acrylate (isomer of 2-EHA), which provide tack and flexibility of the adhesive [2].…”

Effect of the n -butyl acrylate/2-ethylhexyl acrylate weight ratio on the performances of waterborne core–shell PSAs

“…PSAs are widely employed in many industrial 11 applications, such as tapes, labels, protection films, and medical 12 products [2,3]. Recently, waterborne PSAs have received much 13 attention from both industry and academia as a means for 14 complying with environmental regulations [2,4,5]; however, the 15 performances of waterborne PSAs, including their water resis- 16 tance, tack, adhesion, and shear strength, are usually inferior to 17 those of solvent-borne PSAs [6][7][8][9][10]. To overcome such drawbacks, 18 many research efforts have been invested in the design of high- 19 performance waterborne PSAs.…”