Process for preparing a high-molecular polyamide, polyester, copolyester, copolyamide or polyester-amide block copolymer

The invention relates to a process for preparing a high-molecular polyamide or polyester or copolyester by melt-mixing polyamide or polyester or copolyester having a lower molecular weight with a blocked diisocyanate having the following formula. Wherein R= linear, branched or cyclo aliphatic C2-C20...

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Bibliographic Details
Main Authors LOONTJENS, JACOBUS ANTONIUS, PLUM, BARTHOLOMEUS JOHANNES MARGRETHA
Format Patent
LanguageChinese
English
Published 16.09.2003
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:The invention relates to a process for preparing a high-molecular polyamide or polyester or copolyester by melt-mixing polyamide or polyester or copolyester having a lower molecular weight with a blocked diisocyanate having the following formula. Wherein R= linear, branched or cyclo aliphatic C2-C20 or aromatic C6-C20 and B1, B2 = Caprolactam, Imidazole, dimethyl-pyrazole, triazole, oxim, malonic acid ester, ethylacetylacetonate, phenol, cresol, aliphatic alcohol, secundary amine, hydroxy benzoic acid methyl ester. With the process according to the invention a permanent increase in the molecular weight of a polyamide is obtained within 2 minutes, whereas this takes at least 10 minutes under comparable conditions using a blocked isocyanate according to the state of the art.
Bibliography:Application Number: TW200392103688