Dow Global Technolgoies LLC

Dale Hunter

Van Delk

Francois M Casati

Paul A Cookson

Irena Amici-Kroutilova

Sven Claessens

Alberto Lora Lamia

Antoon De Smet

Gerard Pel

Swen Claessens

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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Dale Hunter