http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-549887-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6bbe512ec0e23410fc167e77d67359e2 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B41M5-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B41M5-124 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B41M5-124 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B41M5-10 |
| filingDate | 1941-06-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1942-12-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-549887-A |
| titleOfInvention | Improvements in, and relating to the manufacture of, copying paper |
| abstract | 549,887. Copying paper. WALTI, R. June 26, 1941, No. 8033. Convention date, July 1. 1940. [Classes 96 and 140] [Also in Group XVI] Copying paper is produced by the application to the paper of a single opaque coating consisting of an aqueous emulsion or dispersion of a substance such as wax, paraffin, stearin &c. or a mixture thereof which when dried will peel off or off-set on to the undersurface of the overlying original sheet when impact or pressure is applied thereto so that the coloured background of the copying paper becomes visible where the coating has become off-set thus showing a clear reproduction of the subject-matter written on the original sheet by hand or mechanically. The coated paper is dried at a temperature lower than the melting point of the substance used in the emulsion. In one example a dark coloured paper is coated with a liquid made up of water and an emulsion prepared by heating at 90‹C. and thoroughly agitating 3,000 grammes of water, 30 grammes of triethanolamine as emulsifying medium and 90 grammes of stearic acid and then adding thereto 880 grammes of molten paraffin, stirring vigorously and putting the heated mixture through a homogenizer, this coating giving a white film. Another similar emulsion but containing a dye of deep shade may be applied to white paper, the dye being added for the sole purpose of imparting colour to the base paper. The emulsion may contain a proportion of thickening agent such as tragacanth. Specifications 389,584, 405,858. [Group XVI], and 501,983, are referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3226134-A |
| priorityDate | 1940-07-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 23.