http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-974169-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ec035b62b836fc6bb889bb726f97f6a7 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G18-4841 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-48 |
| filingDate | 1961-11-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_43a4e1e2ffff081fe61dd7f19f10dd3c http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fa16031a11ccc90d81bc7443ea2320b6 |
| publicationDate | 1964-11-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-974169-A |
| titleOfInvention | Improvements in or relating to polyurethanes |
| abstract | A modification of the process of the parent Specification comprises forming the polyurethane as a reaction product of (a) an organic polyisocyanate or polyisothiocyanate with (b) a polyether reactant which comprises a polyol having an average molecular weight of at least 4,000 and formed by reacting (1) a condensation product of an alkylene oxide reactant and an organic compound having at least three active hydrogen atoms in the molecule with (2) at least 1% but less than 10% by weight (of the alkylene oxide content of the condensation product) of ethylene oxide and effecting foam formation with the aid of an organic foaming agent which is present in the reaction mixture in which the polyurethane is formed. The invention is particularly applicable to the preparation of foams by the one-shot technique. Suitable foaming agents are halohydrocarbons, aliphatic hydrocarbons and ethers. The foaming agent can be a gaseous organic compound i.e. a gas at 0 DEG C. and normal pressure or a volatile organic liquid of boiling point up to 75 DEG C. Halogenated hydrocarbons, aliphatic hydrocarbons and ethers are referred to. Preferred reactants are (a) a toluene diisocyanate or a diphenyl methane diisocyanate and (b) a polyol obtained by reacting (1) a condensation product of 1, 2-propylene oxide and an organic compound having at least 3 hydroxy groups in the molecule, preferably glycerol and having a molecular weight between 4,000 and 8,000, e.g. between 4,800 and 5,200 with (2) preferably between 2 and 5% and advantageously about 3% of ethylene oxide (by weight of the propylene oxide content of the condensation product). Low density foams result when the reaction mixture contains a small proportion of water (e.g. 2.5 to 4% of the weight of polyol). Glycol can also be used as cross-linking agent. In Example (1) the polyol is a reaction product of glycerol successively with propylene oxide and ethylene oxide. This is converted to foam by the one shot process by reaction with toluene-2,4-and 2,6-diisocyanates, water, triethylene diamine, stannous octoate, silicone and monofluorotrichloromethane. In a comparison example the polyol used is a glycerol/propylene oxide condensate of average molecular weight about 3,000. Specification 901,362 also is referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3467606-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4883825-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3380967-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0433878-A3 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0433878-A2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0322912-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0207296-A3 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0207296-A2 |
| priorityDate | 1961-11-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 42.