Morphological studies on wettability and tackiness of pressure‐sensitive adhesives

Hino, Kinnosuke; Ito, Toshio; Toyama, Mitsuo; Hashimoto, H.

doi:10.1002/app.1975.070191023

Cited by 19 publications

(7 citation statements)

References 6 publications

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“…Many researchers such as Kraus [1], Chu [2], Hino [3], Wetzel [4,5] and Hock [6] investigated the effects of tackifier on the properties of the adhesive. Wetzel [4,5] and Hock [6] observed indirectly the formation of a second phase of tackifier in the rubbery base polymer, and they pointed out the effect of the second phase on the tackiness.…”

Section: Introductionmentioning

confidence: 99%

The effect of tackifier on phase structure and peel adhesion of a triblock copolymer pressure-sensitive adhesive

Sasaki¹,

Fujita²,

Adachi³

et al. 2008

International Journal of Adhesion and Adhesives

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Section: Introductionmentioning

confidence: 99%

The effect of tackifier on phase structure and peel adhesion of a triblock copolymer pressure-sensitive adhesive

Sasaki¹,

Fujita²,

Adachi³

et al. 2008

International Journal of Adhesion and Adhesives

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“…The tackifier develops the mobility of the base polymer during the taping process by acting as a diluent and also improves the peel strength during the peeling process. Many researchers1–9 as well as ourselves10–14 have investigated the mechanism of tackiness development through the addition of a tackifier.…”

Section: Introductionmentioning

confidence: 99%

Effects of the compatibility of a polyacrylic block copolymer/tackifier blend on the phase structure and tack of a pressure‐sensitive adhesive

Nakamura

Imamura

et al. 2011

J of Applied Polymer Sci

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Adhesion and viscoelastic properties and morphology of a polyacrylic block copolymer/tackifier blend were investigated. Special rosin ester resins with different weight average molecular weights of 650, 710, 890, and 2160 were used as the tackifier and blended with a polyacrylic block copolymer consisting of poly(methyl methacrylate) and poly(n-butyl acrylate) blocks at tackifier content levels of 10, 30, and 50 wt %. The compatibility decreased with an increase in molecular weight. From TEM observation, the number of formed agglomerates of the tackifier with sizes on the order of several tens of nanometers increased with increasing tackifier content and molecular weight of the tackifier in the range from 650 to 890. For the tackifier with a molecular weight of 2160, micrometer-sized agglomerates were observed. The storage modulus at low temperature and the glass transition temperature of adhesive measured by a dynamic mechanical analysis increased dependent on the number of formed nanometer sized agglomerates. Tack was measured using a rolling cylinder tack tester over wide temperature and rolling rate ranges, and master curves were prepared in accordance with the time-temperature superposition law. Tack and peel strength were optimum at a blend combination of intermediate compatibility, i.e., the molecular weight of 890. These optimum properties were correlated to maximal values of the storage modulus at room temperature and the glass transition temperature. Therefore, it was found that these features of blend properties are strongly affected by the nanometer sized agglomerates of tackifier.

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“…The amount of tackifier in the commercially available pressure‐sensitive adhesive tapes is usually several tens wt %. Many researchers investigated the relationship between the phase separation and tackiness development by the tackifier, and observed μm‐sized phase separation in the polymer/tackifier mixture 1–9…”

Section: Introductionmentioning

confidence: 99%

Effects of compatibility between tackifier and polymer on adhesion property and phase structure: Tackifier‐added polystyrene‐based triblock/diblock copolymer blend system

Nakamura

Adachi

Itō

et al. 2010

J of Applied Polymer Sci

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The effects of compatibility of tackifier with polymer matrix and mixing weight ratio of triblock/diblock copolymers as the matrix on the adhesion property and phase structure of tackifier-added polystryrene triblock/diblock copolymer blends were investigated. For this purpose, polystyrene-block-polyisoprene-block-polystyrene triblock and polystyrene-block-polyisoprene diblock copolymers were used and the diblock weight ratio in the blend was varied from 0 to 1. Spherical polystyrene domains with a mean size of about 20 nm were dispersed in the polyisoprene (PI) continuous phase. In the case of the hydrogenated cycloaliphatic resin as tackifier having a good compatibility with PI and a poor compatibility with polystyrene, the peel strength increased with an increase of the tackifier content, and the degree of increase became significant above 40 wt % of tackifier. It was found that the nanometer-sized agglomerates of tackifier in the PI matrix were formed and the distance between the nearest neighbors of agglomerates was about 15 nm from SAXS measurement. The peel strength increased with an increase of the nanometersized agglomerates of tackifier from TEM observation. On the other hand, in the case of the rosin phenolic resin as tackifier having a good compatibility with both polystyrene and PI, the peel strength increased effectively at the lower tackifier content, while no significant increase at higher tackifier content was observed. The agglomerates of tackifier were never confirmed in this system. The higher peel strength was obtained at the diblock weight ratio in the blend of 0.5-0.7 for both tackifier-added systems.

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Morphological studies on wettability and tackiness of pressure‐sensitive adhesives

Cited by 19 publications

References 6 publications

The effect of tackifier on phase structure and peel adhesion of a triblock copolymer pressure-sensitive adhesive

The effect of tackifier on phase structure and peel adhesion of a triblock copolymer pressure-sensitive adhesive

Effects of the compatibility of a polyacrylic block copolymer/tackifier blend on the phase structure and tack of a pressure‐sensitive adhesive

Effects of compatibility between tackifier and polymer on adhesion property and phase structure: Tackifier‐added polystyrene‐based triblock/diblock copolymer blend system

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