Constant volume process for managed heat cure of impregnation sealants
US6652270B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 2001 |
| Grant date | Nov 25, 2003 |
| Priority date | — |
| Expiry date | May 16, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J3/24
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved method is disclosed for heat curing a polymerizable impregnant composition within an impregnated porous article. The amount of the article's porosity that is filled with the impregnant composition is maximized by applying successively discrete temperature and pressure increments in a system comprising at least one porous impregnated article and a curing chamber having a heat transfer medium therein. During such curing, both temperature and pressure are controlled for an initial duration and subsequently increased by successive increments wherein each successive temperature and pressure exceeds a previous temperature and pressure, respectively, until a maximum temperature and pressure is achieved. The maximum temperature and pressure are maintained until the impregnant composition is cured, resulting in an improved product having greater structural integrity and surface quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.