Dow Global Technolgoies LLC

Daniel Hoehener

Francois M Casati

Paul A Cookson

Ricco B Borella

Irena Amici-Kroutilova

Paul Cookson

PIPA polyols are made in a two-step process. In the first step, a base polyether polyol and a polyisocyanate are reacted to form a mixture that contains unreacted base polyol, unreacted polyisocyanate and adducts of the base polyol and polyisocyanate. A low equivalent weight polyol is then added and reacted in a second step to form the dispersion. The process unexpectedly produces a stable dispersion of the fine PIPA particles in the base polyol, even when the base polyol contains mostly secondary hydroxyl groups. The process also permits the tuning of product viscosity by increasing or decreasing the extent of reaction in the first step.

Polyisocyanate polyaddition polyol manufacturing process and product

Embodiments of the invention include a polymer polyol dispersions. The polymer dispersions include a reaction product of a reaction system, where the reaction system includes: at least one polyol, at least one phosphorus based flame retardant having at least one active hydrogen attached to a nitrogen or oxygen atom, at least one of a co-reactant having an equivalent weight of up to 400 and at least one active hydrogen attached to a nitrogen or oxygen atom, at least one catalyst, and at least one polyisocyanate.

Phosphorous based polyaddition / polyurethane-urea polyols

Embodiments include polymer polyol dispersions which include a polyol liquid phase and solid particle phase. Embodiments include methods of making the polymer polyol dispersions. The polymer polyol dispersions are essentially free of tin, have a solid content of between about 20 and 50 wt % based on the total weight of the polymer polyol dispersion, and have a viscosity at 20 C. of less than 9000 mPas. The solid particle phase has more than 90% by weight of particles in the solid particle phase having a particle diameter of less than 5 &#x3bc;m.

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Horgen, Switzerland

Daniel Hoehener