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US 7,005,481 B1Granted
Process for the condensation of polyamides
AssigneeL. Brueggemann KG Sprit-und Chemische Fabrik
InventorsDieter Lehmann, Klaus Titzschkau
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Abstract
The present invention relates to a process for the condensation of polyamides using an additive having carbonate units. This ensures a safe and fast condensation reaction.
Claims18
An additive for the condensation of oligo- and/or (co-)polyamides, comprising at least one structural element of formula (II):
- PA —(—COO —PC′)n≧1 (II)
- wherein PA represents a polyamide block and PC′ represents a polycarbonate block, obtained by reactive extrusion of a polycarbonate with a COOH-terminated polyamide, wherein n is 1 to 3, and
- wherein said polycarbonate block is a condensation product of bisphenol A or bisphenol F.
An additive for the condensation of oligo- and/or (co-)polyamides, comprising at least one structural element of formula (II):
- PA —(—COO—PC′)n≧1 (II)
- wherein PA represents a polyamide block and PC′ represents a polycarbonate block, obtained by reactive extrusion of a polycarbonate with a COOH-terminated polyamide, wherein n is 1 to 3, and
- wherein said polycarbonate block has a molecular weight from 10,000 to 30,000.
Dependencies are inferred from the claim text.