http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-2294912-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_af99df08b153738cd418446a75d09bfc |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F8-34 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F257-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F8-42 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J9-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F8-34 |
| filingDate | 1998-08-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ffef11fe32e07dcf1dee48f42c18935c http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_04f76462aa13ec144fd178c7a9ea7664 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2902bb301fd0680d889f10ea05850aab http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_89eb79403ea389845dbce7949d20e959 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1ac8a2f4730a03601bae0743cb544427 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c7a7acc845ed88b1e605dd48bdb9129e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2704af816a0d028e8148b9610d10aa53 |
| publicationDate | 1999-03-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-2294912-A1 |
| titleOfInvention | Vinyl aromatic polymer coupling and foams |
| abstract | The invention includes a process comprising steps of (1) forming an admixture of (a) a vinyl aromatic polymer and (b) a coupling amount of at least one poly(sulfonyl azide); (2) introducing the vinyl aromatic polymer or admixture into a melt processing device; (3) melting the vinyl aromatic polymer or admixture, and thereafter (4) exposing the admixture to a temperature, hereinafter, melt process temperature, sufficient to result in coupling of the vinyl aromatic polymer. The invention also includes a process of increasing the molecular weight of a vinyl aromatic polymer by heating an admixture of at least one vinyl aromatic polymer and a coupling amount of at least one poly(sulfonyl azide). Alternatively the invention is a process comprising steps of (1) forming, under a first pressure, a mixture of a vinyl aromatic polymer, a blowing agent and at least one poly(sulfonyl azide), with the mixture at a temperature at which the viscosity of the mixture is sufficient to retain the blowing agent when the mixture is allowed to expand; (2) extruding the mixture into a holding zone maintained at a temperature and second pressure which does not allow the mixture to foam, the holding zone having an outlet die defining an orifice opening into a zone of a third pressure lower than the first or second pressures at which the mixture foams, and an openable gate closing the die orifice; (3) periodically opening the gate; (4) substantially concurrently applying mechanical pressure by a movable ram on the mixture to eject the mixture from the holding zone through the die orifice into the zone of third pressure, at a rate greater than that at which substantial foaming in the die orifice occurs and less than that at which substantial irregularities in cross-sectional area or shape occurs; and (5) permitting the ejected mixture to expand unrestrained in at least one dimension to produce an elongated thermoplastic cellular body. The invention also includes any composition comprising a product formed by a process of the invention, said composition preferably comprising a foam or polymer and any article formed from such a composition. |
| priorityDate | 1997-08-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 149.