Polyurethane foam

Patent metadata

Field	Value
Publication number	US-9951172-B2
Application number	US-201515116844-A
Country	US
Kind code	B2
Filing date	Jan 8, 2015
Priority date	Feb 7, 2014
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

Using general purpose raw materials, a polyurethane foam having higher water stopping properties than conventional ones is provided. The polyurethane foam is a polyurethane foam obtained by foaming and curing a composition containing a polyol component, an isocyanate component, a foam stabilizer, a cross-linking agent, and a catalyst.

First claim

What is claimed is:

1. A polyurethane foam for a water stopping sealing material obtained by foaming and curing a composition containing a polyol component, an isocyanate component, a foam stabilizer, a cross-linking agent, and a catalyst,
the polyol component comprising a polyoxypropylene glyceryl ether-based polyol with an average molecular weight of more than 3400 and 4400 or less (wherein in the case of one polyol the average molecular weight is the number average molecular weight, and in the case of two or more polyols the average molecular weight is the sum of the number average molecular weight×mass content ratio of each of the polyols);
the isocyanate component comprising a tolylene diisocyanate (TDI) based isocyanate, a content of the isocyanate component being 40 to 50 parts by mass based on 100 parts by mass of the polyol component;
the cross-linking agent comprising a low molecular weight polyol having 3 or more functional groups and an OH value of 1000 to 2000, a content of the cross-linking agent in the composition being 3.0 to 5.0 parts by mass based on 100 parts by mass of the polyol component; and
the catalyst comprising a resinification catalyst and a foaming catalyst,
a total content of the resinification catalyst and the foaming catalyst in the composition being 1 to 1.5 parts by mass based on 100 parts by mass of the polyol component, wherein
the resinification catalyst and the foaming catalyst are amine catalysts,
a content of the resinification catalyst is in a range of 0.18 to 0.62 parts by mass based on 100 parts by mass of the polyol component, and
a content of the foaming catalyst is in a range of 0.46 to 0.82 parts by mass based on 100 parts by mass of the polyol component.

2. The polyurethane foam according to claim 1 , wherein the TDI based isocyanate comprises 2,4-tolylene diisocyanate and/or 2,6-tolylene diisocyanate.

3. The polyurethane foam according to claim 1 , wherein a content of the cross-linking agent in the composition is 3.5 to 5.0 parts by mass based on 100 parts by mass of the polyol component.

4. The polyurethane foam according to claim 1 , wherein the cross-linking agent has a low molecular weight polyol with 3 to 6 functional groups.

Assignees

• Bridgestone Corp

Inventors

• Kanzaki Shinya

Classifications

• C08G18/7621

  being toluene diisocyanate including isomer mixtures · CPC title

• C08G18/14 Primary

  Manufacture of cellular products · CPC title

• C08G18/6677 Primary

  having at least three hydroxy groups · CPC title

• C08G18/1833

  having ether, acetal, or orthoester groups · CPC title

• C08G18/1808

  having alkylene polyamine groups · CPC title