http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1195707-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J2377-02 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J9-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G69-18 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J9-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G69-18 |
| filingDate | 1967-06-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1970-06-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1195707-A |
| titleOfInvention | Production of Polylactams |
| abstract | 1,195,707. Foamed polylactams. E. I. DU PONT DE NEMOURS & CO. 28 June, 1967 [29 June, 1966], No. 29756/67. Headings C3C and C3R. A process for preparing a foamed polylactam, comprises carrying out the anionic polymerization of a lactam at a temperature between the melting-points of the lactam and of the polylactam in the presence of an anionic catalyst and a co-catalyst and, as blowing agent (i) an organic formate of formula R A -O-C(O)-H, R B (-OC(O)-H) 2 , or Ar<SP>11</SP>-(O-C(O)-H) n , the free valences of the polyvalent aromatic radical Ar<SP>11</SP> being joined to a plurality (n) of formate groups, wherein R A is R c or R D , R c is Ar<SP>1</SP>- or R E -Ar<SP>11</SP>-RF-, Ar<SP>1</SP> and Ar<SP>11</SP> being, respectively, mono- and poly-valent aromatic radicals of 1 to 3 aromatic rings, R E being H or R G -R F -, R F being divalent -C(R G ) 2 -, the R G 's being the same or different and being H, an alkyl group or an aromatic radical of up to 7 carbon atoms, R D is a tertiary alkyl group, the tertiary carbon atom being attached to the formate radical, and R B is divalent -R-Ar<SP>11</SP>-R F -, the R F 's being the same or different; (ii) an organic formamide of formula wherein the free valences of the polyvalent aromatic radical (Ar<SP>11</SP>) are joined to a plurality (n) of formamide groups, wherein the R's and Ar<SP>11</SP> have the same meanings as indicated above for the organic formates, and R H is R D or R M -CH=CH-CH 2 - , R M is H or an alkyl group, R J is H, R c or R E -R F -CH = CH-CH 2 -, R K is R J , an alkyl group, a heterocyclic group containing 1 to 3 hetero N atoms, or an alicyclic radical containing up to 30 carbon atoms, and R L is divalent-R F -CH = CH-CH 2 -, or a divalent alkylene group having a chain of at least 4 carbon atoms between the N atoms of the formamide groups, or (iii) an organic formate/formamide of formula where X is R J or R K , a and b are integers of at least 1 whose sum equals the number of free valences of Ar<SP>11</SP>, and Ar<SP>11</SP>, R, and R K have the same meanings as indicated above. The process is particularly suitable for preparing foamed lactams of 5-12 C atoms such as caprolactam and enantholactam. The anionic catalyst may be a lactam-base salt and is usually used in an amount 0.3-1.5 mole per cent. In the examples #-caprolactam is foamed using N,N- diphenylformamide in the presence of CaCO 3 , NaH in mineral oil, potassium stearate and poly - [2,2 - propanebis - (4 - phenyl carbonate)]. Other foaming agents specified include formanilide, p-anisole formate, tert.-butyl formate, 4-formamidophenyl formate and 2-(N-formamido)-8-aminoanthracene. |
| priorityDate | 1966-06-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 35.