Use of polyamide 6

Abstract

The invention relates to the use of polyamide 6 for reduction of the melt viscosity, to be determined at 260° C. to ISO 11443, and/or of the fill pressure, to be determined according to EN ISO 294-1, of compositions and moulding compounds in which there are 10 to 115 parts by mass of glass fibres per 100 parts by mass of poly-C.sub.1-C.sub.6-alkylene terephthalate.

Claims

1. A method for reduction of the melt viscosity to be determined at 260° C. to ISO 11443, and/or of the fill pressure to be determined according to EN ISO 294-1, of compositions and moulding compounds having 10 to 115 parts by mass of glass fibers per 100 parts by mass of poly-C.sub.1-C.sub.6-alkylene terephthalate, comprising including polyamide 6 in the compositions and moulding compounds.

2. A method according to claim 1, wherein the poly-C.sub.1-C.sub.6-alkylene terephthalate is polyethylene terephthalate.

3. A method according to claim 1, wherein the poly-C.sub.1-C.sub.6-alkylene terephthalate is polybutylene terephthalate.

4. A method according to claim 1, wherein in addition to the glass fibers 0.5 to 30 parts by mass of at least one copolymer of at least one α-olefin and at least one methacrylic ester or acrylic ester of an aliphatic alcohol are applied.

5. A method according to claim 4, wherein the copolymer of at least one α-olefin and at least one acrylic ester used is a copolymer of ethene and 2-ethylhexyl acrylate.

6. A method according to claim 4, wherein the copolymer of at least one α-olefin and at least one acrylic ester used is a copolymer of ethene and butyl acrylate.

7. A method according to claim 1, wherein the amount of polyamide 6 used is 0.5 to 15 parts by mass.

8. A method according to claim 1, wherein the compositions and moulding compounds are the basis for components to be used in the electrical or electronics industry.

9. A method according to claim 1, wherein the compositions and moulding compounds are the basis for components to be used in the electromobility.

10. Compositions, moulding compounds and articles of manufacture comprising, per A) 100 parts by mass of poly-C1-C6-alkylene terephthalate, B) 10 to 115 parts by mass of glass fibres, C) 0.5 to 15 parts by mass of polyamide 6, and D) 0.5 to 30 parts by mass of at least one copolymer of at least one α-olefin and at least one methacrylic ester or acrylic ester of an aliphatic alcohol.

11. Compositions, moulding compounds and articles of manufacture according to claim 10, wherein the poly-C.sub.1-C.sub.6-alkylene terephthalate is polyethylene terephthalate.

12. Compositions, moulding compounds and articles of manufacture according to claim 10, wherein the poly-C.sub.1-C.sub.6-alkylene terephthalate is polybutylene terephthalate.

13. Compositions, moulding compounds and articles of manufacture according to claim 10, wherein the copolymer of at least one α-olefin and at least one acrylic ester used is a copolymer of ethene and 2-ethylhexyl acrylate.

14. Compositions, moulding compounds and articles of manufacture according to claim 10, wherein the copolymer of at least one α-olefin and at least one acrylic ester used is a copolymer of ethene and butyl acrylate.

Description

EXAMPLES

[0179] In order to demonstrate the improvements described in accordance with the invention with regard to melt viscosity and/or fill pressure, corresponding moulding compounds were first made up by compounding. To this end, the individual components were mixed in a twin-screw extruder (ZSK 26 Mega Compounder from Coperion Werner & Pfleiderer (Stuttgart, Germany)) at temperatures in the range from 260 to 290° C., discharged in the form of an extrudate, cooled until pelletizable and pelletized. After drying (generally 2 h at 120° C. in a vacuum drying cabinet), the pellets were processed to form test specimens.

[0180] The test specimens for the investigations reported in Tab. 1 were injection-moulded on an Arburg 320-210-500 injection moulding machine at a melt temperature of 260° C. and a mould temperature of 80° C.

[0181] Reactants:

[0182] Component A): Linear polybutylene terephthalate (Pocan® B 1300, commercial product from Lanxess Deutschland GmbH, Leverkusen, Germany) having an intrinsic viscosity of 93 cm.sup.3/g (measured in phenol:1,2-dichlorobenzene=1:1 at 25° C.)

[0183] Component B): Glass fibres (CS 7967 (26/1493) D, commercial product from Lanxess Deutschland GmbH, Leverkusen, Germany)

[0184] Component C): Polyamide 6 (Durethan® B26, commercial product from Lanxess Deutschland GmbH, Leverkusen, Germany)

[0185] Component D): Ethylene-butyl acrylate copolymer (Lotryl® 28BA700T, SK Functional Polymer)

[0186] Component(s) E):

[0187] E1) nucleating agent: talc

[0188] E2) thermal stabilizer: additive DP0001 [CAS No. 649560-74-7], Lanxess Deutschland GmbH

TABLE-US-00001 TABLE 1 Comp. 2, ex. as per WO Comp. 1 2005/121245A1 Ex. 1 Comp. 3 Ex. 2 Comp. 4 Ex. 3 Component A) [parts by mass] 100 100 100 100 100 100 100 Component B) [parts by mass] 27.5 27.5 27.5 12 12 48 48 Component C) [parts by mass] 3 2 3 Component D) [parts by mass] 8 8 5 5 9.5 9.5 Component E1) [parts by mass] 0.1 0.1 0.1 0.1 0.1 0.2 0.2 Component E2) [parts by mass] 0.1 0.1 0.1 0.1 0.1 0.2 0.2 Fill pressure for [bar] 192 123 105 153 134 156 125 dumbbell specimen Melt viscosity [Pas] 157 94 81 117 105 113 106 (260° C., 1000 s.sup.−1) CTI [V] 325 425 525 375 600 475 500 Heat distortion [° C.] 202 199 205 175 182 205 207 resistance Tensile modulus [MPa] 7015 6530 6595 4354 4510 9095 9627 Tensile strength [MPa] 118 105 103 83 81 123 124 Elongation at break [%] 3.9 3.4 3.4 4.5 4.2 3 3

[0189] In order to determine the fill pressure as defined in EN ISO 294-1, a dumbbell specimen having a geometry according to ISO 527-2/type 1A was injection-moulded, and the pressure required in the injection moulding machine was recorded. The melt temperature was set to 260° C. and the mould temperature to 80° C.

[0190] Melt viscosity was determined at 260° C. to ISO 11443 at the shear rate specified.

[0191] Heat distortion resistance was determined on 80 mm×10 mm×4 mm test specimens to ISO 75-2 Method A (flexural stress of 1.80 MPa).

[0192] Tensile modulus, tensile strength and elongation at break were measured to ISO 527.

[0193] Tracking resistance is described by the CTI (comparative tracking index) and was determined by the method described in standard ISO 60112:2003. The surface of the test specimen (60 mm×40 mm×4 mm) was subjected to an electrical voltage using two electrodes, while the surface was treated between the electrodes with droplets of an electrolyte solution that simulated dust and moisture. The CTI is the highest voltage where there was no failure (short-circuit or ignition) after 50 droplets.

[0194] Tab. 1 shows, especially in the comparison of ex. 1 with comp. 2, an example according to WO 2005/121245A1, that addition of polyamide 6 gave another distinct reduction both in melt viscosity and in fill pressure.