Polyisocyanate composition for soft polyurethane foam and process for producing soft polyurethane foam from the composition

Abstract

To provide a soft polyurethane foam having a favorable storage stability and being simultaneously favorable in rebound resilience and mechanical properties. ¢MEANS FOR SOLVING PROBLEMS! There is provided a polyisocyanate composition for soft polyurethane foam obtained by performing a urethanization reaction of pure MDI (a) with an equivalent amount or less of polyol (b) under the following conditions and thereafter mixing a polymeric MDI (c) with the reaction product. (2,2'-MDI + 2,4'-MDI) / MDI = 60 to 85 mass%, and MDI / ((a) + (C)) = 50 to 90 mass% provided that the component (b) is a polyetherpolyol of 700 to 10,000 number average molecular weight, 2 to 8 functional groups on average and 10 to 40% in the content of oxyethylene in the repeating units.

Description

technical field

[0001] The present invention relates to a polyisocyanate composition for flexible polyurethane foam and a method for producing flexible polyurethane foam using the composition. More specifically, the present invention relates to a polyisocyanate composition capable of obtaining a flexible polyurethane foam having excellent mechanical properties, resilience and compression set, and a method for producing a flexible polyurethane foam characterized by using the composition. Background technique

[0002] Flexible urethane foam can be used in a wide range of applications such as cushioning materials for furniture, car seats, etc., mattresses for bedding, pillows, industrial sealing materials, and sound insulation materials by cutting to an appropriate size or molding with a product-shaped mold. use. In recent years, the demand for foams with good support properties and especially high flame retardancy has been increasing in furniture and mattress applications due...