Polyurethane composition

Patent metadata

Field	Value
Publication number	US-11359046-B2
Application number	US-201816019725-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Jun 28, 2017
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

An object of the present invention is to provide a polyurethane composition, in which reduction in the strength of the foam is suppressed when the foam has been greatly deformed. The present invention relates to a polyurethane composition comprising a base resin and a curing agent, wherein the base resin comprises a compound (A-1) comprising a polyalkylene skeleton comprising neither an aromatic skeleton nor an alicyclic skeleton, and having two or more functional groups having an active hydrogen atom, a compound (A-2) comprising an aromatic skeleton and/or alicyclic skeleton, and having two or more functional groups having an active hydrogen atom, a blowing agent (B), and an amine-based catalyst (C); a polyurethane foam therefrom; and a method for soundproofing and reinforcing a vehicle.

First claim

What is claimed is:

1. A polyurethane composition comprising a base resin composition and a curing agent, wherein the base resin composition comprises a compound (A-1) comprising a polyalkylene skeleton comprising neither an aromatic skeleton nor an alicyclic skeleton, and having two or more functional groups independently selected from a hydroxyl group, a carboxyl group, an amino group, an imino group or a thiol group; at least two different compounds (A-2), each comprising structural units derived from a diamine compound having an aromatic skeleton and/or alicyclic skeleton and structural units derived from an epoxy group; a blowing agent (B); and an amine-based catalyst (C); wherein in each of the at least two different compounds (A-2), a ratio of a number of the structural units derived from the epoxy group to a number of the structural units derived from the diamine compound having the aromatic skeleton or alicyclic skeleton is less than or equal to 0.8, or 5 to 20.

2. The polyurethane composition according to claim 1 , wherein a content of the at least two different compounds (A-2) in the base resin composition is 3 to 50% by mass based on the total mass of the base resin composition.

3. The polyurethane composition according to claim 1 , wherein at least one functional group in the compound (A-1) is a hydroxyl group.

4. The polyurethane composition according to claim 1 , wherein the blowing agent (B) is water, and a content of the blowing agent (B) in the base resin composition is 0.1 to 2% by mass based on the total mass of the base resin composition.

5. The polyurethane composition according to claim 1 , wherein the curing agent contains an aromatic polyisocyanate.

6. A polyurethane foam comprising a cured product of the polyurethane composition as defined in claim 1 .

7. The polyurethane foam according to claim 6 , wherein a density of the polyurethane foam is 80 to 400 kg/m 3 .

8. A method for reinforcing and soundproofing a vehicle, comprising a step of injecting the polyurethane composition as defined in claim 1 into an inside of a closed cross section of a body member with a high pressure foaming machine, and forming a polyurethane foam inside the closed cross section of the body member.

9. A body member comprising the polyurethane foam as defined in claim 6 , the polyurethane foam being arranged inside the closed cross section of the body member.

10. A vehicle comprising the body member as defined in claim 9 .

11. The polyurethane composition according to claim 1 , wherein in each of the at least two different compounds (A-2), the ratio of a number of the structural units derived from the epoxy group to a number of the structural units derived from the diamine compound having the aromatic skeleton or alicyclic skeleton is 5 to 20.

12. The polyurethane composition according to claim 1 , wherein in each of the at least two different compounds (A-2), the ratio of a number of the structural units derived from the epoxy group to a number of the structural units derived from the diamine compound having the aromatic skeleton or alicyclic skeleton is 5 to 16.

Assignees

• Sunstar Engineering Inc

Inventors

• Yamashita Kiichi
• Wakamori Tatsuya

Classifications

• C08G18/4829 Primary

  Polyethers containing at least three hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title

• C08G18/7664

  containing alkylene polyphenyl groups · CPC title

• C08G2110/0058

  ≥50 and <150kg/m3 · CPC title

• C08G18/76

  aromatic · CPC title

• C08G18/643

  Reaction products of epoxy resins with at least equivalent amounts of amines · CPC title