http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1510383-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5817222cc43be9aeb850ef7676498689 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G2110-0083 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G2110-005 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G2110-0008 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G18-4841 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G18-485 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G18-4804 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-48 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-32 |
| filingDate | 1975-10-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1978-05-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1510383-A |
| titleOfInvention | Process for the preparation of polyurethane foam |
| abstract | 1510383 Polyurethane foam BEROL KEMI AB 1 Oct 1975 [2 Oct 1974] 40155/75 Heading C3R A polyurethane foam having a low degree of hardness and high hydrophilicity is prepared by reacting a polyisocyanate in the presence of a catalyst, blowing agent at least partly consisting of water and foam stabilizer with a mixture of at least two mutually insoluble, at least tri-functional polyether polyols, the polyol mixture having a hydroxyl number of 35 to 45, the proportion of primary hydroxyl groups in the polyol mixture being more than 55% and not more than 80% of the total number of hydroxyl groups in the polyol mixture, the polyol mixture containing 50-70% wt. of CH2CH2O units, and the amount of polyisocyanate and polyol mixture being such that the NCO index is 0À85 : 1 to 1À05 : 1. Preferably one of the polyols is soluble in water and preferably has an HLB value of at least 15 and a turbidity point of at least 88 C. and an average molecular weight of 3000 to 5000. The other polyol should preferably have an HLB value not exceeding 5 and a turbidity point of below 70 C. and an average M.Wt. of 3000 to 7000. The polyether polyols can be obtained by adding at least 2 different alkylene oxides, one of which is ethylene oxide and the remainder being preferably propylene oxide and/or butylene oxide; to a nucleus having at least 3 reactive hydrogens, e.g. glycerol, trimethylolpropane or triethanolamine, either as mixtures of alkylene oxides or separately in one or more batches. Suitable polyisocyanates are toluene diisocyanate, hexamethylenediisocyanate, diphenylmethanediisocyanate and polyphenylpolymethylenepolyisocyanate. The catalyst may be a tertiary amine and/or an organo-metal compound. In the examples foams are prepared from formulations comprising an 80/20 mixture of 2,4- and 2,6- toluene diisocyanate, water and optionally trichlorofluoromethane, a silicone oil foam stabilizer, triethylenediamine and dimethylaminoethanol as catalysts, and a polyether polyol mixture which is a mixture of two different reaction products of glycerol with ethylene oxide and propylene oxide. |
| priorityDate | 1974-10-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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