Novolaks of the phenol-dense aldehyde type
US5412058A · kind A · utility
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Key dates
| Filing date | Sep 14, 1990 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Sep 14, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L21/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
New formaldehyde-phenol resins of the novolak type comprising aliphatic aldehyde radicals with 6 or more carbon atoms and with the molar ratio between these heavy aldehyde radicals and the phenolic structures being between 0.9 and 1.2. They are obtained by the condensation of phenols with aldehyde compounds containing at least 543% heavy aldehydes in the presence of acid catalysts in a virtually anhydrous medium. Application to the reinforcement of vulcanized rubbers.
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