| 摘要 |
<p>Distortion and haze of pressure sensitive tapes upon removal can be minimized by incorporating a small amount of chemically compatible, high molecular weight silicone polymer release modifier to the curable PSA compositions. Organopolysiloxanes of the general formula: RR<1>2SiO(R<1>2SiO)x(RR<2>SiO)ySiR<1>2R are used as the release modifier, wherein each R<1> and R<2> is independently an aryl or alkyl group having from 1 to about 10 carbon atoms, each R is independently chosen from the following groups: R<1>, R<2>, alkenyl having from 1 to about 10 carbon atoms, hydrogen, alkoxy (such as methoxy, ethoxy, propoxy, etc.) hydroxy, epoxy, amino, and fluoroalkyl having up to 10 carbon atoms; x and y are each an integer such that the value of (x + y) is sufficient to yield a composition having a viscosity of from at least 1500 cps at room temperature to as high as the viscosity of silicone gums. When compared to similar compositions without the release modifier, a cured silicone PSA with much less distortion, a smoother surface, and clearer optics is obtained upon removal or dispensing.</p> |
