http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-634216-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c91ae94346fec2b319e8775fd10ff867 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F18-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F18-08 |
| filingDate | 1947-05-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1950-03-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-634216-A |
| titleOfInvention | Improvements in or relating to processes of preparing polyvinyl acetate emulsions |
| abstract | A polyvinyl acetate emulsion is prepared from an aqueous emulsion containing up to 40 parts by weight of vinyl acetate for every 60 parts of water, and either a water-soluble persulphate, or hydrogen peroxide in conjunction with an iron compound or a hydrogen peroxide yielding compound in conjunction with an iron compound, a hydrophilic colloid and as a surface tension depressant an alkali metal salt of a sulphated or sulphonated organic compound, the dispersion having an initial pH of not over 6. Iron compounds specified are ferrous or ferric nitrates, chlorides, sulphates, acetates, and benzene or toluene sulphonates. Soluble persulphates specified are those of potassium, sodium, rubidium, caesium, lithium and ammonium. Urea peroxide is specified as a hydrogen peroxide liberating substance. Hydrophilic colloids specified are partially-hydrolyzed polyvinyl acetate, soluble starch, soluble starch degradation products, methyl ether of cellulose, water-soluble glycol cellulose, gum tragacanth, gum acacia, agar-agar, sodium alginate, gum tragon, gum arabic, glue, gelatine, hydroxy ethyl cellulose, and sodium carboxyl methyl cellulose. As surface tension depressants are specified alkali metal isobutyl naphthalene sulphonates, di-isobutyl naphthalene sulphonates, decyl benzene sodium sulphonate, di-sulphonates of dibutyl phenyl phenol, dioctyl sulphosuccinates, and sodium lauryl sulphate. Plasticizers such as dibutyl phthalate and triethylene glycol dihexoate may be added. The vinyl acetate may be added gradually so as to keep the concentration below 25 parts per 100 parts of water. The pH may be regulated by addition of various specified acids and sodium bicarbonate, which latter compound may be premixed with water and vinyl acetate and the mixture added gradually during polymerization. The polymer particle size is very small, usually about 0.2 microns. The emulsions may be used to coat cloth, paper, wood, metals, glass and linoleum. |
| priorityDate | 1947-05-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 68.