| 摘要 |
<p>There is described a removable pressure sensitive adhesive (PSA) composition suitable for applying to protective film used to cover sensitive substrates (such as glass or LCD displays in mobile phones and the like), the PSA comprising: i) 70 to 90% w/w 5 of a hydroxyl functionalized acrylic polymer (such as 2-ethylhexyl acrylate (EHA), n-butyl acrylate (BA), hydroxy ethyl acrylate (HEA) and hydroxy ethyl methacrylate (HEMA); ii) 10 to 30% w/w of a polyether polyol (such as polypropylene glycol (PPG) and/or polyethylene glycol (PEG)); and iii) 2 to 10% of a polyfunctional isocyanate (such as poly diphenylmethane di-isocyanates (MDI) and/or poly toluene di-isocyanates (TDI). Components i), ii) iii) can be mixed together in the same vessel at room temperature: The PSAs have good removability (ultra low peel) and also good wetability.</p> |
