| 摘要 |
1. A process for preparing polyamides, which comprises polymerizing or polycondensation of starting monomers or starting oligomers in the presence of at least one compound of the formula (I) R is a C1-C20 aliphatic saturated hydrocarbon R<8> which bears 1-4 identical or different amide-forming groups R<7>, R<1> is H, C1-C20-alkyl, cycloalkyl, benzyl or OR<6>, where R<6> is H, C1-C20-alkyl, cycloalkyl or benzyl, R<7> is selected from the group consisting of -(NHR<9>), wherein R<9> being H, alkyl group having from 1 to 8 carbon atoms, cycloalkyl group having from 3 to 10 carbon atoms or alkylene group having from 2 to 20 carbon atoms, or carboxyl and group forming carboxylic group, R<2>, R<3>, R<4> and R<5> are independently C1-C10-alkyl, n is a natural number greater than 1, the piperidine derivatives attached to R being identical or different with regard to the substituents, meaning R<1>, R<2>, R<3>, R<4> and R<5>, wherein the compound of the formula I is added to the starting monomers or to the polymerizing reaction mixture. 2. A process as claimed in Claim 1, wherein the piperidine derivatives attached to R are identical with regard to the substituents, meaning R<1>, R<2>, R<3>, R<4> and R<5>. 3. A process as claimed in Claim 1 or 2, wherein R<1> is H. 4. A process as claimed in any of Claims 1 to 3, wherein the R<2>, R<3>, R<4> and R<5> substituents on any one piperidine derivative are identical. 5. A process as claimed in any of Claims 1 to 4, wherein R<2> on any one piperidine derivative is methyl. 6. A process as claimed in any of Claims 1 to 5, wherein n is 2. 7. A process as claimed in any of Claims 1 to 6, wherein R is a group of the formula -NH-R<8>-NH- where R<8> is alkylene having from 1 to 20 carbon atoms. 8. A process as claimed in any of Claims 1 to 7, wherein R is -NH-CH2-CH2-CH2-CH2-CH2-CH2-NH-. 9. A process as claimed in any of Claims 1 to 8, wherein the polymerizing or polycondensation is carried out in the presence of at least one pigment. 10. The use of a compound (I) as stabilizer for preparing polyamides. 11. A polyamide obtainable by a process as claimed in any of Claims 1 to 9. 12. The use of a polyamide as claimed in Claim 11 for preparing filaments, fibers, films, sheetlike structures and moldings. |
