http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-630625-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6ecb2c795fb082222c2bbc3195cf034d |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G75-26 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G75-26 |
| filingDate | 1947-03-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1949-10-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-630625-A |
| titleOfInvention | Linear polythioesters |
| abstract | Polythioesters are prepared by heating a mixture of approximately equimolecular proportions of an acid chloride ClOCRCOCl, and a dimercaptan HS-R1-SH. R and R1 are divalent hydrocarbon, oxahydrocarbon or thiahydrocarbon radicals and the functional groups are attached to different carbon atoms in the radicals. Dimercaptans mentioned are ethylene, trimethylene, tetramethylene hexamethylene and decamethylene; 3-oxa-1,5-dimercaptopentane, 3,6-dioxa-1,8-dimercaptooctane, 4-oxa-1,7-dimercaptoheptane, 3-thia-1,5-dimercaptopentane, 4-thia-1.7-dimercaptoheptane, and mercaptans having the formul <FORM:0630625/IV (a)/1> Suitable acid chlorides mentioned are those in which R is ethylene, 1,2-prolylene, trimethylene, tetramethylene, hexamethylene, octamethylene, decamethylene, o-, m- or p-phenylene, naphthylene, xylylene, diphenylene, dinaphthylene, 3-oxapentamethylene, and 3-thiapentamethylene. Preferably there is a chain of at least 4 atoms between the mercapto groups and of at least 3 atoms between the acid chloride groups. Reaction is preferably performed in absence of oxygen, e.g. with a stream of nitrogen passing through the mixture. The acid chloride may be added in portions or continuously throughout the reaction. Vacuum may be applied. The course of the reaction may be followed by the melt viscosity of the product. Generally a slight excess of dimercaptan (not more than 2 per cent over equimolecular) may be used. Extra reagent may be added to compensate for losses by volatilization. The reactants may be mixed at about 0 DEG C. and warmed to initiate reaction and to produce a homogeneous reaction mixture. Cooling may then be necessary, and finally heating to 200 DEG C. or more after a solid polymer has been formed. Interpolymers may be formed by using more than one of either or both kinds of reagent. The products are particularly useful for fibre production, but may also be used for moulding, or for coating or insulating compositions. Examples describe production of polymers from (1) sebacyl chloride and hexamethylene dimercaptan; (2) terephthalyl chloride and pentamethylene dimercaptan; (3) adipyl chloride and p-xylylene dimercaptan. A table is also given showing the physical properties of a number of other polythioesters from different combinations of reagent. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2456124-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2008091747-A1 |
| priorityDate | 1946-11-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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