Flexible intumescent coating composition
US5070119A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1991 |
| Grant date | Dec 3, 1991 |
| Priority date | — |
| Expiry date | Mar 11, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/907
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is an intumescent curable composition which contains as a resinous binder a flexible polyepoxide resin. The polyepoxide is cured with an appropriate curing agent adapted for the particular resin. An additive component is present which contains a mixture of materials which provide a source of PA0 (i) zinc, PA0 (ii) boron, PA0 (iii) phosphorus, and PA0 (iv) an expansion gas upon thermal decomposition. The composition is capable of forming a carbonaceous char upon exposure to heat or flame, with the proviso that the cured, unburned composition has sufficient flexibility that it passes at least 10 continuous cycles of a cold cycle test without cracking. The cold cycle test involves the following steps; the composition is applied at a thickness of 0.5 inch (12.7 millimeters) to a 10 inch (0.254 meter) section of a 4W13 I-beam having two thermocouples attached to the surface, allowed to cure at ambient temperature for 16 hours, force cured for 5 days at about 60.degree. C. an subjected to the cold cycle test. For one cycle, the beam is placed in a freezer operating at a temperature between about 0.degree. F. (-18.degree. C.) and about -10.degree. F. (-23.degree. C.) for suffici…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.