http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-983366-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9e5302e08e56037ff7bc5c9b6fcc29f9 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08L71-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08L61-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03F7-0381 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L71-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L61-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03F7-038 |
| filingDate | 1961-06-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1965-02-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-983366-A |
| titleOfInvention | Photosensitive compositions and their use in photomechanical printing |
| abstract | A photosensitive composition comprising 0.3 to 3.0 parts by weight of a polyethylene oxide, 1 part by weight of an A-stage resole phenolic resin, and 0.08 to 2 parts by weight of a photo-sensitive substance which yields free radicals on light exposure which react with the resole resin may be coated on a support and used to prepare a planographic printing plate. The composition may contain an oxidizing agent. The plate is exposed and developed with water to produce a continuous tone image which is ink receptive. Specified photo-sensitive compounds are iodoform, bromoform, halogenated paraffins, hydrogen halides, alkyl and alkylene iodides, fuchsin and rhodamine. The resins are prepared by condensing phenolic compounds (e.g. phenol, cresol, resorcinol, xylenol, ethylphenol, butylphenol, isopropylmethoxyphenol, chlorophenol, hydroquinone and naphthol) with an aldehyde (e.g. formaldehyde, acetaldehyde, crotonaldehyde, furfural, acrolein, 1,3,5-trioxane and hexamethylene tetramine) or with a ketone (e.g. acetone). Oxidizing agents specified are ammonium, potassium or sodium persulphate, ammonium, potassium or sodium dichromate, ferric or stannic chloride, chromic oxide, cupric sulphate and mercuric chromate, acetate or oxalate. Preparation of resoles.-A-stage phenolicaldehyde-resole resins are prepared by refluxing a mixture of phenol, (meta-cresol and resorcinol are also used) formalin or paraformaldehyde, water and sodium acetate trihydrate until the resin precipitates and the mixture is poured into water to complete the precipitation. In one example sodium sulphate replaces the sodium acetate trihydrate as catalyst. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4581996-A |
| priorityDate | 1960-07-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 90.