Method for preparing high-resilient flexible urethane foams

• US 4,239,856 A
• Filed: 08/28/1978
• Issued: 12/16/1980
• Est. Priority Date: 08/28/1978
• Status: Expired due to Term

• Current Assignee: The Dow Chemical Company (Dow, Inc.)
• Original Assignee: Texaco Development Corporation (Chevron Corp.)
• Inventors: Rowton, Richard L.
• Primary Examiner(s): Cockeram, H. S.
• Application Number:
  US05/937,303
• Time in Patent Office: 841 Days
• Field of Search: 521/118, 521/159, 521/164, 521/904
• US Class Current: 521/118
• CPC Class Codes: C08G 18/6688 with compounds of group C08G18/3271
• CPC Class Codes: C08G 18/7671 containing only one alkylene bisphenyl group
• CPC Class Codes: C08G 2110/0008 flexible
• CPC Class Codes: C08G 2110/005 < 50kg/m3
• CPC Class Codes: C08G 2110/0058 ≥50 and <150kg/m3
• CPC Class Codes: C08G 2110/0083 prepared using water as the sole blowing agent
• CPC Class Codes: Y10S 521/904 Polyurethane cellular product having high resiliency or cold cure property

Abstract

A stable high-resilient (HR) flexible polyurethane foam may be made from an MDI type isocyanate, a polyether polyol and an amount of diethanolamine in an amount effective for preventing splits in the finished foam. The foams disclosed herein use water as the blowing agent. The disclosed foams have excellent properties and process without splitting.

Claims

1. In a process of preventing splits in high-resilient, flexible polyurethane foam which is the reaction product of a polyether triol of about 5000 to 7000 molecular weight and a methylene diphenyl diisocyanate modified to assume a liquid form and in the presence of water as the only blowing agent, the improvement which comprises

reacting the components in the presence of from about 0.2 to about 2.0 parts by weight of diethanolamine per 100 parts by weight of triol.

2. A process as in claim 1 wherein the polyether triol has a molecular weight of about 5500.