Polishing pad

A polyamine composition, comprising one or more of diamines, triamines or polyamines with more than 3 aminos, wherein an average molecular weight of the polyamine composition is between 200 and 400, an average functionality of the polyamine composition is greater than 2 and not higher than 2.20, and

• wherein proportions of the diamines and the triamines relative to a total amount of the polyamine composition is 77%-96%:3%-12%, respectively, in the polyamine composition;
• or
• wherein proportions of the diamines and tetraamines relative to the total amount of the polyamine composition is 77%-96%:0.1%-10%, respectively, in the polyamine composition;
• or
• wherein the polyamines with more than 3 aminos comprise tetraamines, and wherein proportions of diamines, trimines, and tetraamines relative to the total amount of the polyamine composition are 77%-96%:3%-12%:0.1%-10%.

A polishing pad, comprising a polishing layer, wherein the polishing layer comprises a polyurethane obtained by reacting a multifunctional isocyanate, a polyol composition, and a polyamine composition, and wherein in a liquid chromatogram obtained by a liquid chromatography analysis of the polyamine composition under following conditions,

• a ratio of a peak area with a retention time of 7.0-7.8 min to a peak area with a retention time of 10-11 min is between 5 and 30;
• or
• a ratio of a peak area with a retention time of 7.0-7.8 min to a peak area with a retention time of 14.2-16 min is between 10 and 400;
• or
• a ratio of a peak area with a retention time of 7.0-7.8 min, to a peak area with a retention time of 10-11 min and to a peak area with a retention time of 14.2-16 min is 360-450:15-45:1-40,
• liquid chromatography analysis conditions:
• test sample:
• to 0.0204 g of the polyamine composition, methanol is added until a total mass of 20.0026 g is obtained;
• to 0.2 ml of a solution obtained thereby, methanol is added until a total volume of 2 ml is obtained, such that a 100 ppm solution is obtained by mixing;
• to 0.2 ml of the 100 ppm solution, methanol is added until a total volume of 2 ml is obtained, such that a 10 ppm solution is obtained by mixing;
• chromatography column:
• ZORBAX Eclipse XDB-C18, 4.6*250 mm, 5-Micron, made by Aglient;
• column temperature:
• 40° C.;
• mobile phase:
• A (0.1% formic acid aqueous solution):B(methanol)=20:80;
• flow rate:
• 0.5 ml/min;
• detector:
• a UV detector with a wavelength of 254 nm;
• sample injection volume:
• 10 μl.