PROCESSO PARA A PREPARACAO DE SOLUCOES AQUOSAS OU DISPERSOES DE POLIURETANAS,SOLUCOES OU DISPERSOES OBTENIVEIS DE ACORDO COM ESTE PROCESSO,BEM COMO SUA APLICACAO PARA A PRODUCAO DE REVESTIMENTOS,LACAS OU PELICULAS
The present invention relates to a process for the preparation of aqueous solutions or dispersions of polyurethanes, in which process prepolymers which have at least two free isocyanate groups and contain chemically-fixed hydrophilic groups and/or external emulsifiers which are not chemically fixed...
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| creator | PEDAIN J GRAMMEL J NACHTKAMP K |
| description | The present invention relates to a process for the preparation of aqueous solutions or dispersions of polyurethanes, in which process prepolymers which have at least two free isocyanate groups and contain chemically-fixed hydrophilic groups and/or external emulsifiers which are not chemically fixed are reacted with chain lengthening agents in the aqueous phase, characterized in that the isocyanate prepolymer which is hydrophilically modified and/or contains an external emulsifier is mixed with chain lengthening agents selected from the group consisting of azines and hydrazones in the absence of water and the mixture obtained is then mixed with water. The present invention also relates to the dispersions or solutions which can be obtained by this process. Lastly, this invention relates to the use of the dispersions or solutions which can be obtained by this process for coating flexible substrates. |
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The present invention also relates to the dispersions or solutions which can be obtained by this process. Lastly, this invention relates to the use of the dispersions or solutions which can be obtained by this process for coating flexible substrates.</description><edition>3</edition><language>por</language><subject>AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G ; CHEMISTRY ; COMPOSITIONS BASED THEREON ; GENERAL PROCESSES OF COMPOUNDING ; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ; METALLURGY ; ORGANIC MACROMOLECULAR COMPOUNDS ; THEIR PREPARATION OR CHEMICAL WORKING-UP ; WORKING-UP</subject><creationdate>1979</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19791016&DB=EPODOC&CC=BR&NR=7901579A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19791016&DB=EPODOC&CC=BR&NR=7901579A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>PEDAIN J</creatorcontrib><creatorcontrib>GRAMMEL J</creatorcontrib><creatorcontrib>NACHTKAMP K</creatorcontrib><title>PROCESSO PARA A PREPARACAO DE SOLUCOES AQUOSAS OU DISPERSOES DE POLIURETANAS,SOLUCOES OU DISPERSOES OBTENIVEIS DE ACORDO COM ESTE PROCESSO,BEM COMO SUA APLICACAO PARA A PRODUCAO DE REVESTIMENTOS,LACAS OU PELICULAS</title><description>The present invention relates to a process for the preparation of aqueous solutions or dispersions of polyurethanes, in which process prepolymers which have at least two free isocyanate groups and contain chemically-fixed hydrophilic groups and/or external emulsifiers which are not chemically fixed are reacted with chain lengthening agents in the aqueous phase, characterized in that the isocyanate prepolymer which is hydrophilically modified and/or contains an external emulsifier is mixed with chain lengthening agents selected from the group consisting of azines and hydrazones in the absence of water and the mixture obtained is then mixed with water. 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The present invention also relates to the dispersions or solutions which can be obtained by this process. Lastly, this invention relates to the use of the dispersions or solutions which can be obtained by this process for coating flexible substrates.</abstract><edition>3</edition><oa>free_for_read</oa></addata></record> |
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| subjects | AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP |
| title | PROCESSO PARA A PREPARACAO DE SOLUCOES AQUOSAS OU DISPERSOES DE POLIURETANAS,SOLUCOES OU DISPERSOES OBTENIVEIS DE ACORDO COM ESTE PROCESSO,BEM COMO SUA APLICACAO PARA A PRODUCAO DE REVESTIMENTOS,LACAS OU PELICULAS |
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