Blocked polyisocyanate composition, one-component coating composition, coating film, and coated article

Patent metadata

Field	Value
Publication number	US-11339244-B2
Application number	US-202016937980-A
Country	US
Kind code	B2
Filing date	Jul 24, 2020
Priority date	Mar 29, 2016
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

The present invention provides a blocked polyisocyanate composition comprising a blocked polyisocyanate formed through blocking at least a part of isocyanate groups possessed by a polyisocyanate derived from one or two or more diisocyanates selected from the group consisting of an aliphatic diisocyanate and an alicyclic diisocyanate with an active methylene-based compound comprising a malonic acid diester, wherein a specific molar ratio calculated from contents (mol %) of isocyanurate groups, iminooxadiazinedione groups, uretdione groups, and allophanate groups is 0.05 or more and 0.60 or less.

First claim

The invention claimed is:

1. A blocked polyisocyanate composition comprising a blocked polyisocyanate formed through blocking at least a part of isocyanate groups possessed by a polyisocyanate derived from one or two or more diisocyanates selected from the group consisting of an aliphatic diisocyanate and an alicyclic diisocyanate with an active methylene-based compound comprising a malonic acid diester, wherein
a specific molar ratio represented by formula (1) is 0.05 or more and 0.60 or less:
specific molar ratio=( B+C+D )/( A+B+C+D )  (1)

wherein A represents a content (mol %) of isocyanurate groups represented by formula (I); B represents a content (mol %) of iminooxadiazinedione groups represented by formula (II); C represents a content (mol %) of uretdione groups represented by formula (III); and D represents a content (mol %) of allophanate groups represented by formula (IV),

and
a monohydric alcohol selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, 2-butanol, t-butanol, n-amyl alcohol, isoamyl alcohol, 2-methyl-1-butanol, n-hexanol, 2-methyl-1-pentanol, 2-ethyl-1-butanol, n-heptanol, n-octanol, and 2-ethyl-1-hexanol, and
wherein the monohydric alcohol is in an amount of 10 eq % or more and 500 eq % or less of blocked isocyanate groups.

2. The blocked polyisocyanate composition according to claim 1 , wherein the diisocyanates comprise hexamethylene diisocyanate.

3. A one-component coating composition comprising the blocked polyisocyanate composition according to claim 1 , and a polyvalent active hydrogen compound.

4. A coating film formed of the one-component coating composition according to claim 3 .

5. A coated article comprising the coating film according to claim 4 .

6. A method for producing a composite coating film, the method comprising:
coating with a first coating material solution comprising the one-component coating composition according to claim 3 to form a first coating film; and
coating the first coating film with a second coating material solution to form a second coating film.

7. A composite coating film comprising a first coating film formed of the one-component coating composition according to claim 3 , and a second coating film on the first coating film.

Assignees

• Asahi Chemical Ind

Inventors

• Yamauchi Masakazu
• Takeno Satoshi

Classifications

• C09D175/04 Primary

  Polyurethanes · CPC title

• C08G18/6216

  Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof · CPC title

• C08G18/18

  containing secondary or tertiary amines or salts thereof · CPC title

• C08G18/8048 Primary

  with compounds of C08G18/34 · CPC title

• C08G18/022

  the polymeric products containing isocyanurate groups · CPC title