# US 8,772,434 B2 · Block polyisocyanate and urethane composition containing the same

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- Number: US 8,772,434 B2
- Document ID: US8772434B2
- Status: Granted
- Kind: B2
- Application number: 12/746,328
- Filed: 2008-12-12
- Published: 2010-10-07
- Granted: 2014-07-08
- Earliest claimed: 2007-12-12
- Assignees: Asahi Kasei Chemicals Corporation
- Applicants: Yoshiyuki Asahina; Mio Minakawa
- Inventors: Yoshiyuki Asahina; Mio Minakawa
- Web page: https://patentgrep.com/patent/US8772434B2

## CPC

- C08G 18/6216: {Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof}
- C08G 18/092: {oligomerisation to isocyanurate groups}
- C08G 18/10: Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G 18/4277: {Caprolactone and/or substituted caprolactone}
- C08G 18/807: {with nitrogen containing compounds}
- C09D 175/04: Polyurethanes
- C08G 2115/02: to isocyanurate groups
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

Disclosed is a block polyisocyanate obtained by blocking at least a part of isocyanate groups of a polyisocyanate, which is derived from an aliphatic diisocyanate and a polyol and satisfies all of the conditions (1)-(5) shown below, with a pyrazole compound. (1) Average number of isocyanate groups: 3.0-20 (2) Diisocyanate monomer trimer concentration: 10-50% by mass (3) Isocyanate group concentration: 5-22% by mass (4) Polyol content concentration: 5-40% by mass (5) Diisocyanate monomer concentration: 3% by mass or less.

## Claims

### Claim 1

A blocked polyisocyanate, wherein isocyanate groups of a polyisocyanate which is derived from an aliphatic diisocyanate and a polyol selected from the group consisting of polyester triols and tetraols and satisfies all of the following conditions 1)-6) are mainly blocked with a pyrazole compound:
1) the average number of the isocyanate groups is 3.0 to 20,
2) the trimer concentration of the diisocyanate monomer is 10 to 50% by mass,
3) the concentration of the isocyanate groups is 5 to 22% by mass,
4) the concentration of the polyol components is 5 to 40% by mass,
5) the concentration of the diisocyanate monomer is 3% by mass or less, and
6) the viscosity of the polyisocyanate at 25° C. is from 14000 to 34000 mPa·s.

### Claim 2 (depends on 1)

The blocked polyisocyanate according to claim 1, wherein the average number of the isocyanate groups of the polyisocyanate is 3.5 to 20.

### Claim 3 (depends on 1)

A urethane composition comprising the blocked polyisocyanate according to claim 1.

### Claim 4 (depends on 2)

A urethane composition comprising the blocked polyisocyanate according to claim 2.