Preparation of flexible, flame-bondable polyurethane polyether foams having improved adhesion

• US 5,891,928 A
• Filed: 08/25/1998
• Issued: 04/06/1999
• Est. Priority Date: 06/21/1996
• Status: Expired due to Fees

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Wagner, Klaus, Chakrabarti, Sarbananda
• Primary Examiner(s): Foelak, Morton
• Application Number:
  US09/139,479
• Time in Patent Office: 224 Days
• Field of Search: 21/117, 21/174, 21/176
• US Class Current: 521/117
• CPC Class Codes: C08G 18/4072 Mixtures of compounds of group C08G18/63 with other macromolecular compounds
• CPC Class Codes: C08G 18/4804 Two or more polyethers of different physical or chemical nature
• CPC Class Codes: C08G 18/6564 with compounds of group C08G18/3203
• CPC Class Codes: C08G 18/6674 with compounds of group C08G18/3203
• CPC Class Codes: C08G 2110/0008 flexible
• CPC Class Codes: C08G 2110/005 < 50kg/m3
• CPC Class Codes: C08G 2110/0083 prepared using water as the sole blowing agent
• CPC Class Codes: Y10S 521/918 Physical aftertreatment of a cellular product

Abstract

A flexible, flame-bondable polyurethane-polyether block foam is prepared by a process in which at least one diol is added to the block foam.

Claims

1. A process for the preparation of a flexible, flame bondable polyurethane-polyether block foam said process comprising reacting conventional polyurethane polyether foam components to form a foamable reaction mixture and thereafter admixing at least one diol to said foamable reaction mixture and foaming said foamable reaction mixture to form said block foam.

2. A process as claimed in claim 1, wherein said diol is admixed in an amount of from 1 to 10% by weight, based on the total weight of polyol components in said foam components.

3. A process as claimed in claim 1, wherein said diol comprises an aliphatic diol of the formula (I)

4. A process as claimed in claim 3, wherein said diol is a polymer diol of the formula (II) and has a number average molecular weight of from 300 to 1500.

5. A process as claimed in claim 1, wherein said diol is selected from the group consisting of polyethylene glycol, polyethylene glycol propoxylate, polypropylene glycol, polypropylene glycol ethoxylate and polypropylene glycol propoxylate.

6. A process as claimed in claim 1, wherein the polyurethane-polyether block foam is prepared using at least one filler-containing polyol or a mixture of at least one filler-containing polyol and at least one conventional polyetherpolyol.

7. A flexible, flame-bondable polyether-polyurethane block foam obtained by the process of claim 1.