http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1252462-A
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F10-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F10-00 |
| filingDate | 1969-01-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1971-11-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1252462-A |
| abstract | 1,252,462. Polyethylene laminates. EASTMAN KODAK CO. 31 Jan., 1969 [31 Jan., 1968], No. 5313/69. Heading B5N. [Also in Divisions B2 and C3] A process for preparing polyethylene having a density below 0À930 g./ml., capable of being formed into extrusion coatings on sheet-like substrates and into blown films 1 mil. or less in thickness, involves polymerizing ethylene feed stock comprising ethylene and 0À40-1À2 weight per cent n-heptane, 0À4-2À6 volume per cent propane and 0À5-1À8 volume per cent of impurities viz. methane, ethane, propylene and/or carbon dioxide, in two reaction zones, and the feedstock is introduced into the upper portion of a first reaction zone and polymerized at a temperature of from 175 to 205 C. using decanoyl peroxide as a catalyst, and the reaction mixture from the first reaction zone is passed to a second reaction zone and polymerized at a temperature of from 250 to 274 C. using di-t-butyl peroxide as a catalyst. The examples disclose tests as to the heat sealability of the polymer. The polyethylene was extrusion coated on milk carton stock and the relative absence of any leakage of milk through the 180 degree bottom fold of half gallon cartons manufactured from the stock, was observed. Further examples are concerned with chill roll release (the maximum extrusion coating speeds of the film polyethylene avoiding tearing from the die) draw-down rates and properties of blown film 1 mil. in thickness. The blown film may be used as a backing for disposable diapers. |
| priorityDate | 1968-01-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 26.