Preparation of microcellular polyurethane elastomers
US4559366A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1984 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Mar 29, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There are provided improved integral skin microcellular polyether polyurethane elastomer products, e.g., shoe soles, which are characterized by outstanding low temperature dynamic flex and green strength at demold, at specific gravities as low as about 0.4 gm/cc. These elastomer products are desirably prepared from a two-component system, e.g., the reaction of Component A containing improved quasi-prepolymers, with Component B comprising a compatible liquid mixture containing poly(oxyethyleneoxypropylene)polyol, difunctional chain extender, halogenated blowing agent and other ingredients, as needed, over a relatively wide isocyanate index range without the drawback of any significant loss in the elastomer properties due to index fluctuation within said range. Improved integral skin microcellular polyether elastomers of low densities, e.g., 0.45 gm/cc, characterized by an excellent smooth surface appearance essentially devoid of blemishes can also be prepared from such two-package systems without the use of water as a secondary blowing agent. The said quasi-prepolymers are normally-liquid, may have crystalline points as low as -20.degree. C., and are derived from the reaction of (1)…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.