Blocked polyisocyanate and uses thereof

A blocked polyisocyanate, which is substantially the same product as obtained by blocking 50 to 100% by mole of the terminal isocyanate groups of a non-blocked polyisocyanate with a thermally dissociative blocking agent, said non-blocked polyisocyanate being obtained by reacting at least one diisocyanate selected from the group consisting of an aliphatic diisocyanate and an alicyclic diisocyanate with a polyhydroxy compound having an average number of hydroxyl groups of from 4.5 to 10, and removing substantially all unreacted diisocyanate monomers,

• said non-blocked polyisocyanate having the following characteristics (a) to (d):
• (a) a cyclic isocyanate trimer content of 10% or less, in terms of a ratio of the area of a peak ascribed to a cyclic isocyanate trimer, relative to the total area of all peaks ascribed to said non-blocked polyisocyanate in a gel permeation chromatogram thereof;
• (b) an average number of terminal isocyanate groups of from 5 to 20;
• (c) a number average molecular weight of from 1,200 to 10,000 as measured by gel permeation chromatography (GPC);
• and
• (d) a terminal isocyanate group content of from 5 to 20% by weight,
• said blocked polyisocyanate having the following characteristics (e) to (g):
• (e) an average number of blocked terminal isocyanate groups of from 5 to 20;
• (f) a blocked terminal isocyanate group content of from 2 to 20% by weight;
• and
• (g) a number average molecular weight of from 1,500 to 15,000 as measured by GPC.