High-temperature polyamide molding compounds reinforced with flat glass fibers
First Claim
1. A reinforced polyamide molding compound having a high notched impact strength, consisting of:
- (A) 20 to 60 wt % of at least one partially aromatic polyamide with a DSC melting point (ISO
11357) of at least 270°
C., having a solution viscosity, measured in m-cresol (0.5 wt %, 20°
C.) of η
rel less than 1.9,the one or more polyamides selected from the group consisting of;
polyamide 6T/6I, which contains 50 to 80 mol % hexamethyleneterephthalamide units and 20 to 50 mol hexamethyleneisophthalamide units;
polyamide 6T/66 which contains 50 to 80 mol % hexamethyleneterephthalamide units and 20 mol % to 50 mol % hexamethyleneadipamide (66) units;
ternary polyamide 6T/6I/66 containing 50 mol % to 70 mol % hexamethyleneterephthalamide units, 5 mol % to 45 mol % hexamethyleneisophthalamide units and 5 mol % to 45 mol % hexamethyleneadipamide (66) units;
and mixtures, blends or alloys thereof;
(B) 40 to 80 wt % of at least one filler consisting of;
(B1) 20 to 80 wt % flat glass fibers with an elongated shape, where the glass fibers have a noncircular cross-sectional area and a dimension ratio of the main cross-sectional axis to the secondary cross-sectional axis of 2 to 6,(B2) 0-30 wt % particulate or stratified fillers,(B3) 0-30 wt % boron fibers and/or basalt fibers and/or aramid fibers (p- or m-aramid fibers),(B4) 0 to 30 wt % glass fibers with a round cross section,wherein the weight percent of each type of filler (B1)-(B4) is based on the entire molding compound; and
(C) 0 to 20 wt % of additives and auxiliary substances, not including carbon fiber,wherein the amount of components (A) through (C) in wt % yields 100% together.
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Abstract
The present invention relates to reinforced polyamide molding compounds containing high-melting partially aromatic polyamides and flat glass fibers, in particular with a rectangular cross section, i.e., glass fibers with a noncircular cross-sectional area and a dimension ratio of the main cross-sectional axis to the secondary cross-sectional axis of 2 to 6, in particular 3 to 6, most especially preferably from 3.5 to 5.0. The present invention also relates to a method for manufacturing polyamide molding compounds and molded articles manufactured therefrom, i.e., in particular injection-molded parts. The inventive molded parts have a high transverse stiffness and transverse strength.
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Citations
29 Claims
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1. A reinforced polyamide molding compound having a high notched impact strength, consisting of:
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(A) 20 to 60 wt % of at least one partially aromatic polyamide with a DSC melting point (ISO
11357) of at least 270°
C., having a solution viscosity, measured in m-cresol (0.5 wt %, 20°
C.) of η
rel less than 1.9,the one or more polyamides selected from the group consisting of; polyamide 6T/6I, which contains 50 to 80 mol % hexamethyleneterephthalamide units and 20 to 50 mol hexamethyleneisophthalamide units; polyamide 6T/66 which contains 50 to 80 mol % hexamethyleneterephthalamide units and 20 mol % to 50 mol % hexamethyleneadipamide (66) units; ternary polyamide 6T/6I/66 containing 50 mol % to 70 mol % hexamethyleneterephthalamide units, 5 mol % to 45 mol % hexamethyleneisophthalamide units and 5 mol % to 45 mol % hexamethyleneadipamide (66) units; and mixtures, blends or alloys thereof; (B) 40 to 80 wt % of at least one filler consisting of; (B1) 20 to 80 wt % flat glass fibers with an elongated shape, where the glass fibers have a noncircular cross-sectional area and a dimension ratio of the main cross-sectional axis to the secondary cross-sectional axis of 2 to 6, (B2) 0-30 wt % particulate or stratified fillers, (B3) 0-30 wt % boron fibers and/or basalt fibers and/or aramid fibers (p- or m-aramid fibers), (B4) 0 to 30 wt % glass fibers with a round cross section, wherein the weight percent of each type of filler (B1)-(B4) is based on the entire molding compound; and (C) 0 to 20 wt % of additives and auxiliary substances, not including carbon fiber, wherein the amount of components (A) through (C) in wt % yields 100% together. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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24. The polyamide molding compound according to claim 1, wherein the flat glass fibers with an elongated shape have a dimension ratio of the main cross-sectional axis to the secondary cross-sectional axis of 3 to 6.
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25. The polyamide molding compound according to claim 1, wherein the flat glass fibers with an elongated shape have a dimension ratio of the main cross-sectional axis to the secondary cross-sectional axis of 3.5 to 5.0.
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26. The polyamide molding compound according to claim 1, wherein the flat glass fibers have a diameter of the main cross-sectional axis of 6 to 40 μ
- m and have a diameter of the secondary cross-sectional axis of 3 to 20 μ
m, whereby the ratio of the cross-sectional axes perpendicular to each other is in the range of 3.5 and 5.0.
- m and have a diameter of the secondary cross-sectional axis of 3 to 20 μ
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27. The polyamide molding compound according to claim 1, wherein the flat glass fibers are selected from the group consisting of E-glass fibers, A-glass fibers, C-glass fibers, D-glass fibers, M-glass fibers, S-glass fibers or R-glass fibers or mixtures thereof, only E- and S-glass fibers, and whereby the fibers are provided with an amino or epoxysilane coating.
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28. The polyamide molding compound according to claim 1, wherein the one or more polyamides has a solution viscosity, measured in m-cresol (0.5 wt %, 20°
- C.), of η
rel less than 1.8.
- C.), of η
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29. The polyamide molding compound according to claim 1, wherein the one or more polyamides is selected from the group consisting of:
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polyamide 6T/6I, which contains 62 to 73 mol % hexamethyleneterephthalamide units and 25 to 38 mol % hexamethyleneisophthalamide units; polyamide 6T/66 which contains 52 to 62 mol % hexamethyleneterephthalamide units and 38 mol % to 48 mol % hexamethyleneadipamide (66) units; and mixtures, blends or alloys thereof.
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Specification