Impact resistant transparent polyamide alloys

• US 20020128377A1
• Filed: 02/04/2002
• Published: 09/12/2002
• Est. Priority Date: 06/17/1997
• Status: Active Grant

• Current Assignee: EMS-Patent AG (Emesta Holding AG)
• Original Assignee: Uhde Inventa-Fischer AG (Thyssenkrupp AG)
• Inventors: Hewel, Manfred, Torre, Hans Dalla
• Granted Patent: US 6,831,137 B2
• Time in Patent Office: Days
• US Class Current: 524/600
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 77/06 Polyamides derived from polyamines and polycarboxylic acids C08L77/10 takes precedence

Abstract

The invention concerns a transparent polyamide alloy, produced by compounding it from 30-98% by weight of a transparent, amorphous, rigid and brittle polyamide A with at least 35 mole % cyclo-aliphatic diamine and a glass transition point of at least 150° C., and 2-70% by weight of a transparent, impact resistant polyamide B with at least 40-80 mole % of at least one long-chain polyamide-forming monomer, with more than 10 carbon atoms and at least 10 mole % terephthalic acid and a glass transition point of under 70° C.

Claims

1. A transparent polyamide alloy, with a TG of >

120°

C., produced by compounding from 70-98% by weight of a transparent, amorphous, rigid and/or brittle polyamide A with a glass transition point of at least 180°

C. containing not more than 25 mol % of a lactam or a ω

-aminocarbonic acid with a carbon number of 6-12, at least 35 mol % of a cycloaliphatic diamine, and dicarbonic acids except terephthalic acid and 2-30% by weight of a transparent, amorphous, impact resistant polyamide B with a glass transition point below 90°

C., containing 50-80 mol % of at least one long-chain lactam or ω

-aminocarbonic acid or diamine/dicarbonic acid pair with more than 10 carbon atoms, and a diamine of C₆ carbon atoms and at least 10 mole % terephthalic acid.

2. A polyamide alloy according to claim 1, characterized in that the cycloaliphatic diamine of the polyamide A is one selected from the group consisting of 3,3′

-dimethyl-4,4′

-diamino-dicyclohexylmethane, 4,4′

-diamino-dicyclo-hexyl-2,2-propane, 4,4′

-diamino-dicyclohexylmethane, 5-amino-1,3,3-trimethyl-cyclo-hexanemethaneamine, bis (aminomethyl)-cyclohexane, bis-(aminomethylnorbornane), 3(4),8(9)bis-aminomethyl-tricyclo 5,2,1,0,^2.6-decane or its mixtures.

3. Polyamide alloy according to claim 1, characterized in that in the polyamide B, besides the terephthalic acid, contain further dicarbonic acids selected from the group consisting of isophthalic acid, 2,6-naphthaline dicarbonic acid, tributylisophthalic acid, azeleinic acid, sabacinic acid, dodecanedioic acid or a C₃₆-dicarbonic acid or their mixtures.

4. Polyamide alloy according to claim 1, characterized in that the long-chain monomers in the polyamide B is one selected from the group consisting of Lactam 12 or ω

-aminolaurinic acid, a dodecandioic acid/dodecandiamine pair or their mixtures.

5. Polyamide alloy according to claim 1, characterized in that the polyamide B contains 4,4′

diaminedicyclohexylmethanes, 4,4′

diamino-dicyclohexyl-2,2′

-propanes or their mixtures.