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Blocked polyisocyanate and uses thereof

  • US 6,111,048 A
  • Filed: 05/27/1998
  • Issued: 08/29/2000
  • Est. Priority Date: 02/28/1996
  • Status: Expired due to Term
First Claim
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1. 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.

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