Polymeric substrate containing mercapto and sulfonic groups
US6051658A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1998 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Apr 27, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst useful for the condensation of an aldehyde or ketone starting material with a phenol is an insoluble mercaptosulfonic acid compound. The heterogeneous catalysts comprise catalytically-active species represented by the formula: ##STR1## L is an optional linking group and -- is a bond, which catalytically-active species is attached by the bond -- to an insoluble organic or inorganic support; PA1 or a catalytically-active species represented by the formula: ##STR2## wherein L' is an optional linking group, -- is a bond and .theta.' and .theta." are residues of .theta., and a and b are independently selected from integers equal to or greater than 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.