Polyether based 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 a system consisting essentially of:

• (A) an isocyanate component comprising one or more compounds having at least two isocyanate groups;
• (B) a polyether polyol component having an EO content of less than 80 wt % based on the total weight of the polyether polyol;
• (C) optionally, a component selected from the group consisting of methoxy poly(ethylene glycol) with Mw ranging from 350˜3000, poly(ethylene glycol) with Mw ranging from 350˜3000, and low Mw diol with Mw ranging from 62 to 500;
• (D) optionally, a catalyst;
• (E) optionally, a hydrophilic amino siloxane compound represented Formula I:
• wherein each R independently represents methyl, ethyl, n-propyl, i-propyl, n-butyl, i-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;
• (F) a surfactant;
• (G) a chain extender N-aminoethylpiperazine;
• and
• (H) water.