Chalk-resistant, medium to dark colored polyurethanes, polymer/polyol and polyisocyanate compositions for use in producing same and methods for making said polyurethanes
US4143002A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1977 |
| Grant date | Mar 6, 1979 |
| Priority date | — |
| Expiry date | Jun 20, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/56
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Improvements in polymer/polyol compositions which are convertible by reaction with polyisocyanates to polyurethanes which are pigmented to a medium to dark color and which inherently chalk upon exposure to weather and wherein the polymer of the polymer/polyol composition is dispersed in the polyol thereof and is formed from one or more polymerizable ethylenically unsaturated monomers. The improvement provides to said polyurethanes resistance to chalking on exposure to weather and in one embodiment comprises the presence, in the polymer/polyol compositions used to make the polyurethanes, of a metallocene from the class consisting of ferrocene, ferrocene derivatives, cobaltocene and nickelocene in an amount effective to provide chalk resistance. Optionally, the metallocene can be present in the polyisocyanate composition instead of the polymer/polyol composition. Improved dark colored polyurethanes are made by reacting a mixture comprising (a) a polymer/polyol composition and (b) an organic polyisocyanate in the presence of (c) a catalyst for the reaction of (a) and (b), (d) a metalocene, preferably ferrocene, or a ferrocene polymer and (e) a medium to dark pigment to produce the pol…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.