Polymer dispersion comprising particles of polyurethane and a copolymer or terpolymer produced by emulsion polymerization of olefinically unsaturated monomers
US6924336B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2001 |
| Grant date | Aug 2, 2005 |
| Priority date | — |
| Expiry date | Jun 8, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L75/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polymer dispersion comprising an aqueous, continuous phase and dispersed particles of polyurethane, which is based on organic, non-aromatic isocyanates with a functionality of at least 2, said polyurethane having a high degree of crystallinity and whose crystalline phase has a melting point between 25 and 70° C., and a copolymer and/or terpolymer having a Tg (glass transition temperature) between −20 and +50° C. obtainable by emulsion polymerization of ethylenically unsaturated monomeric materials containing only C, H, O and/or N atoms, which monomeric materials comprise from 0.5 to 15 percent on the total of monomeric materials of monomers containing at least one nitrile group, in a weight ratio between 50:50 and 10:90 (polyurethane to emulsion polymer), in which the particles of the dispersion are in the form of multiphase particles comprising said polyurethane and said copolymer and/or terpolymer and which dispersion is obtainable by emulsion polymerization of the monomeric materials in the presence of the polyurethane dispersion, said eventual polymer dispersion having a solids content of 30 to 70%. The invention also comprises the use of these dispersions as an adhesive, esp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.