Invention Grant
- Patent Title: Transparent polyamides with good weathering resistance
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Application No.: US17863240Application Date: 2022-07-12
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Publication No.: US12104055B2Publication Date: 2024-10-01
- Inventor: Etienne Aepli
- Applicant: EMS-CHEMIE AG
- Applicant Address: CH Domat/Ems
- Assignee: EMS-CHEMIE AG
- Current Assignee: EMS-CHEMIE AG
- Current Assignee Address: CH Domat/Ems
- Agency: Dennemeyer & Associates LLC
- Main IPC: C08L77/06
- IPC: C08L77/06 ; B29C39/00 ; B29K77/00 ; B29K507/04

Abstract:
The invention relates to a polyamide molding composition with good weathering resistance containing or preferably consisting of the following components:
85 to 99.85% by weight of a component A, where component A consists of polyamide A1 or of a mixture of the polyamides A1 and A2, where A1 is at least one amorphous or microcrystalline polyamide having more than 60 mol % of monomers having exclusively aliphatic structural units, based on the total amount of monomers, and A2 is at least one acyclic aliphatic polyamide, and where the sum of components A1 and A2 gives 100% by weight of component A;
0.05 to 2.0% by weight of at least one colorant B;
0.10 to 3.0% by weight of at least one stabilizer C;
0 to 10% by weight of additives D, other than A, B and C;
the proportions by weight of components A to D summing to 100% by weight, wherein
the polyamide molding composition comprises neither carbon black nor nigrosine, the color lightness L*, determined according to DIN EN ISO 11664-4:2020 in the CIELAB color space on a plate of the dimension 60×60×2 mm, being at most 32, and the polyamides A1 having a transparency of at least 88% and a haze of at most 5%, in each case determined according to ASTM-D1003-21 on a plate of the dimension 60×60×2 mm.
85 to 99.85% by weight of a component A, where component A consists of polyamide A1 or of a mixture of the polyamides A1 and A2, where A1 is at least one amorphous or microcrystalline polyamide having more than 60 mol % of monomers having exclusively aliphatic structural units, based on the total amount of monomers, and A2 is at least one acyclic aliphatic polyamide, and where the sum of components A1 and A2 gives 100% by weight of component A;
0.05 to 2.0% by weight of at least one colorant B;
0.10 to 3.0% by weight of at least one stabilizer C;
0 to 10% by weight of additives D, other than A, B and C;
the proportions by weight of components A to D summing to 100% by weight, wherein
the polyamide molding composition comprises neither carbon black nor nigrosine, the color lightness L*, determined according to DIN EN ISO 11664-4:2020 in the CIELAB color space on a plate of the dimension 60×60×2 mm, being at most 32, and the polyamides A1 having a transparency of at least 88% and a haze of at most 5%, in each case determined according to ASTM-D1003-21 on a plate of the dimension 60×60×2 mm.
Public/Granted literature
- US20230033437A1 TRANSPARENT POLYAMIDES WITH GOOD WEATHERING RESISTANCE Public/Granted day:2023-02-02
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