A method for sequentially preparing copolyamides from lactams, diamines, and dimer acids.

JP7877314B2Active Publication Date: 2026-06-22BASF SE
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
BASF SE
Filing Date
2021-11-15
Publication Date
2026-06-22

AI Technical Summary

Technical Problem

Existing methods for preparing copolyamides do not effectively address the need for continuous processes and do not achieve optically improved transparent copolyamides with reduced defects, particularly in the production of films and molded articles.

Method used

A continuous method involving the copolymerization of lactam, C32-C40 dimer acid, and C4-C12 diamine, with optional C4-C20 diacid, in a vertical polymerization tube at controlled temperatures, followed by separation and processing to achieve a random copolymer with improved distribution and reduced defects.

Benefits of technology

The method produces copolyamides with enhanced optical purity and reduced defects, enabling the production of transparent films and molded articles up to 2 mm thick with improved coloration and color depth.

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Abstract

1. A process for the continuous preparation of a copolyamide by copolymerizing at least one lactam (A) with a monomer (M), comprising the steps of: a) mixing at least one lactam (A) with a monomer (M) at a temperature between 60 and 150°C; b) passing the mixture obtained in step a) from top to bottom through a vertical polymerization tube at a polyamide formation temperature to obtain a copolyamide; Including, The method, wherein the monomer (M) comprises at least one C32-C40 dimer acid (B1) and at least one C4-C12 diamine (B2) and optionally at least one C4-C20 diacid (B3).
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Citation Information

Patent Citations

  • JP1974011992A

  • JP1974037705A

  • JP1990073858A

  • JP2012511604A

  • JP2019529638A