http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1098636-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a22da5b7dd6ed60a21538e5edb23e051 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-866 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08L67-02 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L67-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-86 |
| filingDate | 1965-08-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1968-01-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1098636-A |
| titleOfInvention | Catalystic process for making polyesters |
| abstract | In the manufacture of polyesters by reacting a dicarboxylic acid (or ester-forming derivative thereof) with a glycol of formula HO-(CH2)n-OH, where n = 2 to 10, and then polycondensing the resulting product, there is used as a polycondensation catalyst an antimonyl derivative of a polyhydric phenol containing an orthodihydroxy grouping. Many aliphatic and aromatic dicarboxylic acids are mentioned. Specified catalysts are those made by reacting antimony trichloride with pyrogallol, catechol, p-phenyl catechol, 4:6-dimethyl catechol, 4-methyl catechol, 4-methyl-6-butyl catechol, 4-tert. butyl catechol, 1:2-dihydroxy naphthalene, 4-chlorocatechol and gallic acid. Polycondensation may also be effected in the presence of certain polyphosphonate or phosphitepolyphosphonate compounds as stabilizers or certain chain-branching agents. Examples describe the preparation of polyethylene terephthalate from ethylene glycol and free terephthalic acid using as catalyst o-phenylene antimonate or a mixture thereof and the corresponding chloride. Reference has been directed by the Comptroller to the Specification 740,381. |
| priorityDate | 1964-08-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 37.