Control of the cytotoxicity level of Tacky-Free Polyurethanes Pressure-Sensitive Adhesives for Minimal health and safety issues
발표자
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초록
내용
Polyurethane pressure-sensitive adhesives (PU-PSAs) with satisfactory tack, cohesion, and removability were newly developed through the synthetic process by reacting methylene diisocyanate, poly(ethylene glycol) (PEG), and a 1,4-butanediol chain extender based on the different HDI/HDI trimer ratios. The sticking properties of PU-PSAs depended on both the HDI/HDI trimer ratio and crosslinking-agent composition in the formulation. The differences in the crosslinking-density significantly affected the cohesion, adhesion, and tack in PU-PSA. The formulation of 50 wt% 600PEG and 50 wt% crosslinking-agent and an HDI/HDI trimer ratio of 1.0 led to the optimal balance between the adhesion and cohesion properties owing to the sufficient tack, high 180-peel strength, and good cohesion. PU-PSAs formulation with cell viabilities over 90% in a cytotoxicity test could be considered as a novel non-cytotoxic excellent candidate material for as a completely removable PSA in labels and medical patches.