Dow Global Technolgoies LLC

Van Delk

Qinghao Meng

Christopher Thiede

Dale Hunter

Francois M Casati

Kaoru Aou

Paul A Cookson

Irena Amici-Kroutilova

Sven Claessens

Alberto Lora Lamia

Antoon De Smet

Meagan Broadway

Morgan A Springs

Jillian Charon

Doug Todd

Scott Snyder

Gerard Pel

Swen Claessens

Flexible polyurethane foams having high airflows and excellent viscoelastic properties are made using a polyol mixture that includes a certain liquid polyester, certain ethylene oxide polyols and certain propylene oxide polyols, and a polymeric MDI. When used in applications such as bedding, the high airflows contribute to an improved sense of comfort by the user.

Viscoelastic polyurethane foams

Recovery time and/or airflow of flexible polyurethane foam is increased by including certain tackifiers in the foam formulation. The tackifiers are characterized in being incompatible with polyol or polyol mixture used to make the foam, having a viscosity of at least 10,000 centipoise at 25&#xb0; C., having a glass transition temperature of at most 15&#xb0; C. and being inert to other components of the foam formulation.

Viscoelastic foam

Polymer polyols are made in a seeded process, in which styrene and acrylonitrile are polymerized in the presence of a base polyol, a seed dispersion and a solvent. The seed dispersion contains an unsaturated macromer. The process produces a polymer polyol in which the dispersed phase particles have a particle size of 1 to 3 &#x3bc;m and a particle size span of less than 1.25. The polymer polyols are very useful for making flexible polyurethane foam for cushioning applications, in which high airflows and good load bearing are needed.

Process making polymer polyol having monodisperse dispersed polymer particles

Viscoelastic foam is made by reacting an isocyanate compound with water and a polyol mixture. The polyol mixture contains a dispersion of polyurethane or polyurethane-urea particles in a carrier polyol (a PIPA polyol) and at least one other polyol that is a homopolymer of propylene oxide or a copolymer of 20 to 99.9 weight-% propylene oxide and 0.1 to 80 weight-% ethylene oxide, has 2 to 4 hydroxyl groups per molecule and has a hydroxyl equivalent weight of 200 to 400. The VE foams are characterized by high airflows and long recovery times.

PIPA polyol based viscoelastic foams

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