http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-815145-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_8b11e95d0541501dbc7a461eae9515fb |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C23F1-42 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C10G15-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C23F1-42 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C10G15-00 |
| filingDate | 1957-09-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1959-06-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-815145-A |
| titleOfInvention | Etching bath |
| abstract | 815,145. Etching. MERGENTHALER LINOTYPE CO. Sept. 27, 1957 [Oct. 8, 1956], No. 30380/57. Class 100(2) An etching bath comprises (1) an aqueous dispersion containing nitric acid, (2) a tetradecyl, sulphate (C11H29SO4M1 where M is a metal cation) present in the proportion 0.2-2.5 per cent by weight of nitric acid calculated as HNO3 and (3) a water-immiscible liquid petroleum fraction boiling at 70-390C., in the proportion 1-75 per cent by volume of nitric acid solution. There may be added (4) a subsituated 1,1,4,4, - tetra-alkyl - 2 - butyne - 1, 4 - diol nonionic surfactant of the general formula R1R2C(OH)C:C:C(OH)R3R4, where R1 and R4 are allkyl radicals having 4-14 carbon atoms, and R2 and R3 are alkyl radicals having 1-5 carbon atoms, and (5) antifoaming agents such as silcone resin emulsions. (1) The nitric acid strength is 3-25 per cent by weight of the solution, usually 10-13 per cent for etching magnesium or magnesium alloy plates and 15- 20 per cent for zinc plates. (2) The preferred compound is sodium 7 - ethyl - 2 - methyl - undecane - 4 - sulphate, 0.2-0.8 per cent for magnesium, 1-2.5 per cent for zinc. (3) Examples are kerosene (suitable for polyvinyl ammoniac ester resists), gasoline, benzine, coal oil, lubricating oil fractions, diethyl benzenes (for biochromated colloid but not polyvinyl cinnamic ester resists) turpentine, and perchloroethylene. (4) Examples are 5, 8 - dimethyl - 6 - dodecyne - 5, 8 - diol, 13, 16 - dimethyl - 14 - octacosyne - 13, 16 - diol, 15, 18 - dimethyl - 16 - dotriacontyne - 15, 18 - diol, in solution in acetone or ethylene ,glycol, in proportion 0.05-3.75 per cent by weight of HNO3, namely 0.05-1.2 for magnesium and 0.25-3.75 for zinc. The proportion of (4) to (2) in the bath should be from 0.025-1 to 1.5-1. The emulsion stability should be such that separation occurs in ¢-1¢ minutes. Resists referred to are polyvinyl cinnamic acid ester sensitized with 2, 4, 6 - trinitro-aniline, and polyvinyl alcohol, fish glue and ammonium dichromate. Specifications 703,814, 703,815, 704,824, 705,004, 709,315, [713,947, 717,710, 717,711, 717,712 and 752,450 [all in Group IV(a)] are referred to. |
| priorityDate | 1956-10-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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