Huntsman International LLC

Imperial Chemical Industries Limited

Robert J Lockwood

Brian Fogg

Verlin D Poole

Viscoelastic foams and elastomers based on a reaction system comprising a monomeric polyisocyanate composition, a specified mixture of polyols, and a specified package of additives. The viscoelastic materials offer superior combinations of physical properties, including surprisingly low compression sets. Very soft viscoelastic foams and microcellular elastomers can be conveniently prepared from the reaction system without the necessity of using plasticizers. The reaction system can be processed into useful polymeric articles using a wide range of conventional polyurethane processing methods.

Viscoelastic polyurethanes

Process for flexible polyurethane foam manufacture via separate and variable component mixing of at least 3 separate component streams, where at least one of the streams is TDI and one other stream is a preferred composition of MDI. Further provided is an empirical method for determining the level of TDI over a wide range of water levels and formulation compositional differences.

Manufacture of MDI-TDI based flexible polyurethane foams

An open-celled polyurethane foam is provided having a density of 1.5 to 5.0 pcf, a G value of 30 to 80 over a static load range of 1.0 to 2.0 psi based on a 2.0 inch thickness and a 24 inch drop height and, an airflow in the range of 0.05 to 0.5 scfm, 25% as compressive strength of 4.0 psi or more prepared by a process comprising reacting, under foam forming conditions:

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Macomb, MI, United States of America

Robert J Lockwood