Moldable composition suitable for the preparation of vitreous carbon
US4624984A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1985 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Oct 1, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L61/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The moldable composition disclosed herein comprises co-reacted mixtures of powder or otherwise blendable form of 20-80% by weight of a phenolic-furfuraldehyde Novolac resin and of 20-80% by weight of a phenolic-aldehyde resol resin in water, either in solution or suspension, the percentages being based on the combined weight of the Novolac and resol resins, and the aldehyde in said Novolac resin comprising at least 50 molar percent, preferably substantially 100 percent, furfuraldehyde. The composition contains an amine such as hexamethylenetetramine ("hexa") in an amount equivalent to 1-15%, preferably 2-10% of hexamethylenetetramine based on the total amount of phenolic component. The composition is made by adding the preformed phenol-furfuraldehyde Novolac to the resol resin prior to dehydration of the resol resin to produce a grafted polymerization product of improved properties. This composition is particularly useful in admixture with a carbonaceous filler, preferably graphite in a proportion as high as 76% by weight based on the total composition. Generally in such admixtures the graphite may comprise 30-76%, advantageously 35-65% and preferably 40-60% of the molding composit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.