http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-4228496-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c8c2462cd5db1dff2fec1c4ee90d72a5 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D201-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G69-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G69-48 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D201-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G69-48 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G69-20 |
| filingDate | 1992-08-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ca2eb798db3caefe10cd1b24f032d638 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d63d32e13fd9ec4d7f172cc4aa9ca1a0 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_08024d6d31f925d7b85ea07e22c4764a |
| publicationDate | 1994-03-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-4228496-A1 |
| titleOfInvention | Process for the depolymerization of polycaprolactam |
| abstract | A process for the rapid alkaline depolymerisation of polycaprolactam (I) comprises depolymerisation in the melt in the presence of conventional catalysts (e.g. alkali metals, hydroxides and/or carbonates) (II), with addn. of di- and/or poly-carboxylic acid anhydrides (III), opt. contg. additional functional gps., so as to form imide co-catalysts and reduce the melt viscosity. Pref. (III) are, e.g. cyclic anhydrides of succinic, maleic, phthalic, trimellitic, pyromellitic or benzophenone- tetracarboxylic acid. USE/ADVANTAGE - The process enables the rapid depolymerisation of (I) (esp. scrap polyamide) at relatively low temp. to give relatively pure caprolactam without producing any toxic residues with disposal problems. The added anhydride (e.g. trimellitic anhydride) reacts with (I) to form, e.g. 5-carboxyphthalimido-n- hexanoic acid and its homologues, which act as imide co-catalysts to displace the equilibrium towards depolymerisation. The process also reduces the viscosity of the melt, thus facilitating dispersion of catalyst (II) and removal of caprolactam from the melt. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-9618612-A1 |
| priorityDate | 1992-08-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 36.