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filingDate 1979-12-05-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fd3191d71a6e3ea78c8285777563e585
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publicationDate 1980-06-25-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber EP-0012343-A1
titleOfInvention Use of stabiliser compositions to improve the thermostability of thermoplastic polyetherpolyurethanes
abstract A) Diisocyanaten, B) Polyätherpolyolen vom Molekulargewicht 400 bis 10 000, gegebenenfalls C) bis zu 100 Gew.-%, bezogen auf B), an weiteren Polyhydroxylverbindungen vom Molekulargewicht 400 bis 10000 und D) Kettenverlängerungsmitteln vom Molekulargewicht 32 bis 400, die als Stabilisator eine Kombination aus a) 0,05 bis 2,0 Gew.-%, bezogen auf Polyurethan, eines oder mehrerer an sich bekannter Antioxidantien und b) 1 bis 20 Gew.-%, bezogen auf Polyurethan, eines Copolymerisats enthalten. Dieses Copolymerisat b) ist aus: ba) mindestens 5 Gew.-%, bezogen auf Copolymerisat, eines polaren, olefinisch ungesättigten Monomeren aus der Gruppe Acrylnitril, Acrylsäure- und Methacrylsäurealkylester und bb) mindestens 20 Gew.-%, bezogen auf Copolymerisat, mindestens eines unpolaren oder wenig polaren, olefinisch ungesättigten Monomeren aus der Gruppe Butadien, Isopren, Styrol und α-Methylstyrol, und gegebenenfalls bc) andere Monomeren aufgebaut. Besonders bevorzugt sind als Komponente b) Pfropfkautschuke, wie ein Pfropfprodukt von Styrol und Acrylnitril auf Polybutadiene, während vemetzte Kautschuke am wenigsten bevorzugt sind. Nicht geeignet sind im wesentlichen unpolare Polymerisate, wie z.B. natürlicher Kautschuk, EPM, EPDM und reiner Butadienlatex. Thermoplastic polyurethanes stabilized against thermal degradation A) diisocyanates, B) Polyether polyols of molecular weight 400 to 10,000, if appropriate C) up to 100 wt .-%, based on B), of other polyhydroxy compounds with a molecular weight of 400 to 10,000 and D) chain extenders of molecular weight 32 to 400, which as a stabilizer a combination of a) 0.05 to 2.0 wt .-%, based on polyurethane, one or more known antioxidants and b) 1 to 20 wt .-%, based on polyurethane, contain a copolymer. This copolymer b) is made of: ba) at least 5% by weight, based on the copolymer, of a polar, olefinically unsaturated monomer from the group consisting of acrylonitrile, acrylic acid and methacrylic acid alkyl esters and bb) at least 20% by weight, based on the copolymer, of at least one non-polar or slightly polar, olefinically unsaturated monomer from the group of butadiene, isoprene, styrene and α-methylstyrene, and if appropriate bc) other monomers built up. Particularly preferred as component b) are graft rubbers, such as a graft product of styrene and acrylonitrile on polybutadienes, while crosslinked rubbers are the least preferred. Essentially non-polar polymers, such as natural rubber, EPM, EPDM and pure butadiene latex, are not suitable.
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