16-02-2017 дата публикации
Номер: US20170043451A1
Принадлежит:
A weather-resistant polishing pad, including an upper layer operating for polishing, a buffer layer, and a transparent base. The buffer layer is disposed between the upper layer and the transparent base, and the upper layer, the buffer layer, and the transparent base are bonded via a pressure sensitive adhesive or an adhesive agent. The upper layer includes a weather-resistant polyurethane prepolymer, a curing agent, and a functional filler. The polyurethane prepolymer is a polymerization product of polyol and polyfunctional isocyanate. The polyfunctional isocyanate includes a first isocyanate containing no benzene ring, or the first isocyanate having an isocyanato group and a benzene group, and the isocyanato group and the benzene group are connected indirectly. 2. The polishing pad of claim 1 , whereinthe first isocyanate containing no benzene ring is methylene-bis-4,4′-cyclohexyl isocyanate, cyclohexyl diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, propilidene-1,2-diisocyanate, tetramethylene-1,4-diisocyanate, 1,6-hexamethylene diisocyanate, dodecane-1,12-diisocyanate, cyclobutane-1,3-diisocyanate, cyclohexane-1,3-diisocyanate, cyclohexane-1,4-diisocyanate, 1-isocyanato-3,3,5-trimethyl-5-isocyanato methylcyclohexane, methyl cyclohexene diisocyanate, triisocyanate of hexamethylene diisocyanate, triisocyanate of 2,4,4-trimethyl-1,6-hexane diisocyanate, hexamethylene diisocyanate, ethylene diisocyanate, 2,2,4-trimethyl hexamethylene diisocyanate, dicyclohexyl methane diisocyanate, a derivative thereof, an oligomer thereof, or a mixture thereof; andthe first isocyanate having an isocyanato group and a benzene group which are indirectly connected is benzene dimethylene diisocyanate, benzene diethylene diisocyanate, benzene diisopropylidene diisocyanate, tetramethyl benzene dimethylene diisocyanate, a modified compound thereof, a derivative thereof, an oligomer thereof, or a mixture thereof.3. The polishing pad of claim 1 , wherein the ...
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