Low viscosity aspartate terminated prepolymers for adhesive applications

An aspartate-terminated prepolymer, comprising:

• a reaction product of a first reaction mixture comprising:
• an aliphatic NCO-terminated prepolymer having an NCO content of from 0.5 wt % to 15 wt % based on ISO 11909:2007 and a number average NCO functionality of <2;
• and
• a compound according to formula (I)
• wherein,
• X represents a linear, branched, and/or cyclic aliphatic group obtained by removing amino groups from a linear, branched, and/or cyclic aliphatic polyamine,
• R1 and R2 are identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less,
• R3 and R4 are identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less,
• n represents an integer with a value of at least 2,
• wherein the aliphatic NCO-terminated prepolymer and the compound according to formula (I) are combined at an NCO:NH equivalent ratio of 1:1.5 to 1:5.