http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-790070-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_73ee0bacab5a7576a6a3244747f6ea99 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F36-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F220-14 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F36-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F220-14 |
| filingDate | 1955-07-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_27824018f518515e2794b3bec6797637 |
| publicationDate | 1958-02-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-790070-A |
| titleOfInvention | Improvements in or relating to the emulsion polymerisation of olefinically unsaturated compounds |
| abstract | A monomer mixture containing from 50 to 72 per cent of methyl methacrylate and correspondingly 50 to 28 per cent of butadiene-1,3 is polymerized in the presence of a continuous aqueous phase containing initially at least 0.05 per cent of an ionic emulsifying agent based on the total weight of monomers, and a non-ionic emulsifying agent is added when at least 30 per cent of the monomer mixture has been converted to copolymer, the total amounts of the emulsifying agents used being not less than 2.5 per cent and not more than 8 per cent by weight based on the weight of the monomer mixture, the ratio of the total weight of the non-ionic to the ionic emulsifier being at least 0.5 to 1. Ionic emulsifiers specified are sodium oleate, palmitate and stearate, sodium lauryl, oleyl and cetyl sulphates, the sodium salt of sulphated higher secondary alcohols, sodium dodecyl benzene sulphonate, sodium sulphonated castor oil, and the sodium salt of sulphated or sulphonated methyl oleate; non-ionic emulsifiers specified are the condensation products of ethylene oxide with dodecyl alcohol, octyl cresol and fatty acids. Polymerization is preferably carried out in the presence of a catalyst, e.g. hydrogen peroxide, potassium persulphate or a redox system consisting of an organic peroxide or hydroperoxide together with an activator such as a ferrous sulphate/potassium pyrophosphate complex with, if desired, a sugar. Polymerization may be carried out in the presence of a modifier such as C6-C18 mercaptans, e.g. normal and tertiary dodecyl mercaptans, dialkyl xanthogen disulphides, di(benzoic acid ester) tetrasulphides, tolyldisulphide and tolyltrisulphide. The aqueous phase may contain an alkali metal salt or alkali to reduce the viscosity of the final latex, e.g. potassium and sodium chlorides and potassium hydroxide, the pH of the reaction mixture preferably lying between 6 and 10. The latices are used as paints in admixture with pigments such as titanium dioxide, lithopone, ochre, iron oxide, zinc oxide, sienna, phthalocyanine pigments, china clay, barytes, blanc fixe and Paris white, sequestering agents such as sodium pyrophosphate or hexametaphosphate, and ammoniated casein solution. Specifications 745,927 and 749,719 are referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3264242-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5378755-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5403359-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3379667-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3506604-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5403640-A |
| priorityDate | 1955-07-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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