Waterborne polyurethane dispersion and method for preparing the same

A waterborne polyurethane dispersion comprising polyurethane particles dispersed in water, wherein the waterborne polyurethane dispersion is derived from the reaction of:

• (A) an isocyanate component comprising one or more compounds having at least two isocyanate groups;
• (B) an isocyanate-reactive component comprising one or more compounds having at least two isocyanate-reactive groups, wherein the isocyanate-reactive component comprises polyether polyols having a hydroxyl functionality of 3.0 and a weight average molecular weight of 1,500 to 12,000 g/mol;
• (C) a hydrophilic amino siloxane compound represented by Formula I:
• wherein each R independently represents methyl, ethyl, n-propyl, i-propyl, n-butyl, butyl, sec-butyl, t-butyl, n-pentyl, i-pentyl, tert-pentyl, neo-pentyl, cyclohexyl, phenyl, vinyl, allyl or —(OCH2CH2)a—O—CH2—CH═CH2;
• R1 is —(CH2)mNH2 or —(CH2)s—NH—(CH2)tNH2;
• R2 is —CH2CH2CH2O(CH2CH2O)nH;
• and
• each of R3, R4, R5, R6 and R7 is independently selected from the group consisting of methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, t-butyl, n-pentyl, i-pentyl, tert-pentyl, neo-pentyl, cyclohexyl and phenyl;
• wherein a is an integer of 1 to 10;
• x is an integer of 20-500;
• y is an integer of 1-10;
• z is an integer of 1-10;
• m is an integer of 1-5;
• s is an integer of 1, 2, 3, 4 or 5;
• t is an integer of 1, 2, 3, 4 or 5;
• and n is an integer of 5-20;
• and wherein the content of the hydrophilic amino siloxane compound (C) is from 2.0 wt % to 10 wt %, based on the total weight of the isocyanate component (A), the isocyanate-reactive component (B), and the catalyst (D);
• (D) a catalyst;
• (E) a surfactant;
• (F) a chain extender;
• and
• (G) water.