http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-917879-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_94aafba413093babffa661ec0ca0c362 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C25B13-06 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C25B13-06 |
| filingDate | 1961-05-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1963-02-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-917879-A |
| titleOfInvention | Improvements in and relating to diaphragms |
| abstract | A method of preparing a diaphragm for use in an electrolytic alkali-chlorine cell comprises dissolving at least one acidic unsaturated organic compound in a non-polymerizable solvent, impregnating an asbestos diaphragm with the solution, evaporating the solvent, contacting the substantially solvent-free diaphragm with a co-polymerizable olefinically unsaturated compound containing at least two <FORM:0917879/IV(a)/1> groups, and copolymerizing the acidic compound and co-polymerizable compound thereon. The acidic compound may be a carboxylic or sulphonic acid or an anhydride or salt thereof, e.g. maleic anhydride, anhydrides and acid chlorides of acrylic or styrene parasulphonic acids or salts thereof. Solvents specified are ethers such as dioxane, chlorinated hydrocarbons such as ethylene dichloride, and ketones such as acetone. Poly-unsaturated comonomers specified are divinyl-benzene, -toluenes, -naphthalenes, -phenyl vinyl ethers and -diphenyls and alkyl substituted derivatives thereof, diallyl esters, e.g. diallyl phthalate, ethylene glycol dimethacrylate and liquid polybutadiene. Optionally monovinyl aromatic compounds and their alpha-alkyl substituted derivatives may also be present, e.g. vinyl-toluenes, -naphthalenes, -ethyl benzene, -chlorobenzenes and -xylenes. Polymerization catalysts specified are benzoyl peroxide, 2 azo-bis(isobutyronitrile), boron trifluoride and peroxydicarbonates, e.g. isopropyl peroxydicarbonate. Forms of asbestos specified are chrysotile, crocidolite, anthophyllite and amosite. The diaphragm may be impregnated with 6 to 300 wt. per cent polymer based on the dry asbestos. In an example crocidolite asbestos paper impregnated with copolymers of maleic anhydrides and divinyl benzene are used as membranes in cells operated at average voltages ranging from 4,1 to 5,1. Specification 907,484 is referred to. |
| priorityDate | 1960-05-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 48.