Molding composition based on polyetheramides
A molding composition containing the following components: I. from 99.9 to 95 parts by weight of a polyetheramide obtained from 1) a linear aliphatic diamine having from 6 to 12 carbon atoms, 2) a linear aliphatic or aromatic dicarboxylic acid having from 6 to 12 carbon atoms, and 3) a polyetherdiamine having at least 3 carbon atoms per ethereal oxygen atom and having a primary amino group at an end of the chain, and II. from 0.1 to 5 parts by weight of a copolymer which contains from 0.8 to 20% by weight of an anhydride or an epoxide in copolymerized form, wherein the total amount of I. and II. is 100 parts by weight, is suitable for the extrusion of flexible pipes, and also for the production of flexible blow-molded articles.
1. A molding composition, comprising:
I. from 99.9 to 95 parts by weight of a polyetheramide obtained from 1) a linear aliphatic diamine having from 6 to 12 carbon atoms, 2) a linear aliphatic or aromatic dicarboxylic acid having from 6 to 12 carbon atoms, and 3) a polyetherdiamine having at least 3 carbon atoms per ethereal oxygen atom and terminated with primary amino groups and having a zero-shear viscosity at 220° C. of at least 500 Pas.;
II. from 0.1 to 5 parts by weight of a copolymer which comprises the following units in copolymerized form:
wherein alkyl is methyl, ethyl, propyl, butyl, pentyl or hexyl,
R 1 -R 7 are independently H or C n H 2n+1 , where n=from 1 to 6, or phenyl, and
m is 0 or 1, and wherein the sum of the amounts of said polyetheramide (I) and said copolymer (II) is 100 parts by weight, the molding composition having a zero-shear viscosity at 220° C. of at least 2000 Pas.
2. The molding composition as claimed in claim 1 , wherein said polyetheramide has a crystallite melting point T m of at least 160° C.
3. The molding composition as claimed in claim 2 , wherein said crystallite melting point T m is at least 175° C.
4. The molding composition as claimed in claim 1 , wherein said polyetheramide has a relative solution viscosity η rel of at least 1.80.
5. The molding composition as claimed in claim 4 , wherein said relative solution viscosity η rel of said polyetheramide is at least 1.85.
6. The molding composition as claimed in claim 1 , wherein the zero-shear viscosity of said polyetheramide is at least 800 Pas.
7. The molding composition as claimed in claim 1 , wherein the polyetherdiamine component (3) of the polyetheramide (I) has a number-average molecular weight ranging from 230 to 4000.
8. The molding composition as claimed in claim 1 , wherein the polyetherdiamine content of the polyetheramide ranges from 5 to 50% by weight.
9. The molding composition as claimed in claim 1 , wherein the zero-shear viscosity of said composition at 220° C. is at least 5000 Pas.
10. The molding composition as claimed in claim 1 , wherein said copolymer comprises at least
0.1% by weight of unit a) and/or
0.1% by weight of unit b) and/or
0.1% by weight of unit e).
11. The molding composition as claimed in claim 1 , wherein said composition comprises not more than 50% by weight, based on the molding composition, of other polymers.
12. The molding composition as claimed in claim 1 , wherein said composition comprises not more than 10% by weight, based on the molding composition, of additives.
13. A molding produced from the molding composition as claimed in claim 1 .
14. The molding as claimed in claim 13 , produced by extrusion, coextrusion, blow molding, 3D blow molding, coextrusion blow molding, coextrusion 3D blow molding, coextrusion suction blow molding, or injection molding.
15. The molding as claimed in claim 13 , wherein said molding is a monopipe, a multilayer pipe, a profile, or a hollow article.
16. A molding composition, comprising:
I. from 99.9 to 95 parts by weight of a polyetheramide obtained from 1) a linear aliphatic diamine having from 6 to 12 carbon atoms, 2) a linear aliphatic or aromatic dicarboxylic acid having from 6 to 12 carbon atoms, and 3) a polyetherdiamine having at least 3 carbon atoms per ethereal oxygen atom and terminated with primary amino groups and having a zero-shear viscosity at 220° C. of at least 500 Pas.;
II. from 0.1 to 5 parts by weight of a copolymer which comprises the following units in copolymerized form:
wherein alkyl is methyl, ethyl, propyl, butyl, pentyl or hexyl,
R 1 -R 7 are independently H or C n H 2n+1 , where n=from 1 to 6, or phenyl, and
m is 0 or 1, and wherein a the sum of the amounts of said polyetheramide (I) and said copolymer (II) is 100 parts by weight, the molding composition having a zero-shear viscosity at 220° C. of at least 2000 Pas;
wherein said polyetheramide has a relative solution viscosity η rel of at least 1.80.
17. The molding as claimed in claim 1 , wherein said polyetheramide does not include caprolactam or laurolactam.