http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-647732-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3cf82cecbb1d303b3ff52f6cdbc592ce http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_445a797690bdb3709f7c1a0a64853ba2 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_fb183d55a9f45b4fc864667f17a71728 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08C19-12 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08C19-12 |
| filingDate | 1947-11-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1950-12-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-647732-A |
| titleOfInvention | Improvements in or relating to the manufacture of chlorinated rubber |
| abstract | Chlorinated synthetic rubber is obtained by concurrently adding in an oxygen-free atmosphere a chlorinating agent and an aqueous solution of a chlorination initiator to an acid aqueous dispersion of an unsaturated synthetic rubber free from dissolved oxygen, the rate of addition of the initiator solution being so regulated in relation to the rate of the chlorinating agent as to maintain the initiator in the dispersion. The chlorinating agent may be elementary chlorine, alkali metal hypochlorites such as sodium hypochlorite, alkaline earth metal hypochlorites, hypochlorous acid, and chloramine T. Specified synthetic rubbers are butadiene polymers and copolymers of butadiene with styrene. A chlorination initiator is defined as a water-soluble metal salt yielding metal ions oxidizable by alkali metal hypochlorite in aqueous solution with removal of only one electron per atom. Suitable initiators are water-soluble ferrous salts such as the chloride or sulphate, cobaltous sulphate, nickelous chloride, nickelous nitrate, nickelous sulphate and titanium trichloride. Specification 634,241 is referred to.ALSO:Chlorinated rubber is obtained by concurrently adding in an oxygen-free atmosphere a chlorinating agent and an aqueous solution of a chlorination initiator to an acid aqueous dispersion of natural or unsaturated synthetic rubber free from dissolved oxygen, the rate of addition of the initiator solution being so regulated in relation to the rate of the chlorinating agent as to maintain the initiator in the dispersion. The chlorinating agent may be elementary chlorine, alkali metal hypochlorites such as sodium hypochlorite, alkaline earth metal hypochlorites, hypochlorous acid, and chloramine T. Specified synthetic rubbers are butadiene polymers and copolymers of butadiene with styrene. A chlorination initiator is defined as a water-soluble metal salt yielding metal ions oxidizable by alkali metal hypochlorite in aqueous solution with removal of only one electron per atom. Suitable initiators are water-soluble ferrous salts such as the chloride or sulphate, cobaltous sulphate, nickelous chloride, nickelous nitrate, nickelous sulphate and titanium trichloride. In examples a stabilized 20 per cent natural rubber latex was treated with caustic soda to remove all dissolved oxygen in a vessel which had been air-freed by means of a nitrogen current. Hydrochloric acid was then added and sodium hypochlorite and ferrous sulphate the temperature being kept below 25 DEG C. After neutralization with ammonia and the addition of sodium cyanide solution to remove iron salts, the dispersion was creamed with sodium alginate and could be precipitated with alcohol. The stabilizer may be polyethylene glycol ether, especially one derived from oleyl alcohol, or a polyethylene glycol ester, or a quaternary ammonium compound such as dodecyl dimethyl benzyl ammonium chloride, or cetyl pyridinium bromide. Specification 634,241 is referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0071587-A1 |
| priorityDate | 1947-11-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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