Low viscosity, high solids polymer polyols prepared using a preformed dispersant
US4745153A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 17, 1986 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Dec 17, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L75/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention is a process for preparing a polymer polyol comprising the steps of PA0 (a) forming in a first step a dispersant by homopolymerizing a vinyl-terminated adduct, or copolymerizing said adduct with an ethylenically unsaturated monomer or mixture thereof which is not a vinyl-terminated adduct, in the presence of an active hydrogen-containing compound as a solvent under conditions such that the resulting dispersant is soluble in a base polyol, and has a Brookfield viscosity of less than about 25,000 centipoises as a 20-35 wt. -% solution in an active hydrogen-containing compound, and PA0 (b) polymerizing an ethylenically unsaturated monomer or mixture thereof in the presence of said dispersant and a base polyol under conditions such that the polymerized monomer forms a plurality and particles which are stabilized against agglomeration by the dispersant. The process of this invention provides for improved stability of the dispersed polymer particles in the base polyol, and provides a polymer polyol of surprisingly low viscosity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.