Internally emulisified polyurethane dispersion and method for preparing the same

An internally emulsified polyurethane dispersion comprising polyurethane particles dispersed in water, wherein the polyurethane dispersion is derived from starting materials comprising:

• Component (A):
• one or more compounds having at least two isocyanate groups;
• Component (B):
• one or more compounds having at least two isocyanate-reactive groups;
• Component (C):
• a hydrophilic amino siloxane compound represented by 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, tolyl, 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, phenyl and tolyl;
• wherein a is an integer of 1 to 10;
• x is an integer of 20-500;
• y is an integer of 1-20;
• z is an integer of 1-20;
• m is an integer of 1-10;
• s is an integer of 1-10;
• t is an integer of 1-10;
• and n is an integer of 5-30;
• Component (D):
• a polyetheramine compound represented by Formula II:
• wherein each of R8 and R9 is independently selected from the group consisting of hydrogen, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, t-butyl, n-pentyl, i-pentyl, tert-pentyl, neo-pentyl, cyclohexyl, phenyl, tolyol, and combinations thereof, and q is an integer of 2 to 20;
• Component (E):
• a C2-C20 carboxylic acid compound having at least two hydroxyl groups;
• Component (F) a catalyst;
• Component (G) a neutralizer;
• and
• Component (H) water, wherein:
• the content of component (A) is from 5 to 50% by weight, based on the total weight of the components (A), (B), (E) and (F);
• the content of component (B) is from 25 to 85% by weight, based on the total weight of the components (A), (B), (E) and (F);
• the content of component (E) is from 1 to 10% by weight, based on the total weight of the components (A), (B), (E) and (F);
• the content of component (F) is up to 1% by weight, based on the total weight of the components (A), (B), (E) and (F);
• the molar ratio between component (G) and component (E) is from 1:2 to 2:1;
• the weight ratio between component (D) and the total weight of the components (A), (B), (E) and (F) is from 1:100 to 3:10;
• and
• the weight ratio between component (C) and the total weight of the components (A), (B), (E) and (F) is from 1:50 to 1:10.