Polysiloxane-modified polyhydroxy polyurethane resin, method for producing same, heat-sensitive recording material using the resin, imitation leather, thermoplastic polyolefin resin skin material, material for weather strip, and weather strip

A process for producing a polysiloxane-modified polyhydroxy polyurethane resin, which comprises:

• reacting a 5-membered cyclic carbonate polysiloxane compound represented by following formula (1) and a primary diamine compound:
• wherein A is
• in which R1 is an alkylene group that has from 1 to 12 carbon atoms and may have therein a linkage by an element selected from the group consisting of O, S, and N or a linkage by —(C2H4O)b— or both the linkages,
• R2 is a direct bond or an alkylene group having from 2 to 20 carbon atoms, wherein R2 may be linked to an alicyclic group or aromatic group,
• b stands for a number of from 1 to 300, and
• a stands for a number of from 1 to 300.