# US 8,785,534 B2 · Use of polyamides that are resistant to corrosion and stress cracking

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- Number: US 8,785,534 B2
- Document ID: US8785534B2
- Status: Granted
- Kind: B2
- Application number: 13/637,894
- Filed: 2011-03-29
- Published: 2013-01-24
- Granted: 2014-07-22
- Earliest claimed: 2010-03-30
- Assignees: BASF SE
- Applicants: Martin Klatt; Manoranjan Prusty; Axel Wilms; Anka Bernnat; Martin Baumert; Raquel Fernandez Rodiles; Philippe Desbois; Jochen Engelmann; Byung Seok Kim
- Inventors: Martin Klatt; Manoranjan Prusty; Axel Wilms; Anka Bernnat; Martin Baumert; Raquel Fernandez Rodiles; Philippe Desbois; Jochen Engelmann; Byung Seok Kim
- Web page: https://patentgrep.com/patent/US8785534B2

## CPC

- C08L 77/02: Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence)
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- C08K 5/0016: {Plasticisers}
- C08K 5/005: {Stabilisers against oxidation, heat, light, ozone}
- C08K 5/18: with aromatically bound amino groups
- C08K 7/14: Glass
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/03: containing three or more polymers in a blend
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The use of thermoplastic molding materials comprising A) 10 to 98.8% by weight of a mixture formed from a1) 40 to 70% by weight of nylon-6,6 or nylon-4,6 or nylon-6 or mixtures thereof, a2) 30 to 60% by weight of a polyamide having a ratio of methylene to amide groups of 7 to 12, B) 1 to 50% by weight of a fibrous or particulate filler, C) 0.1 to 3% by weight of a lubricant, D) 0.05 to 3% by weight of a heat stabilizer, E) 0 to 40% by weight of further additives, where the sum of the percentages by weight A) to E) and a1) and a2) adds to 100%, for production of stress cracking- and corrosion-resistant moldings.

## Claims

### Claim 1

A method comprising producing a thermoplastic molding material comprising
A) 10 to 98.8% by weight of a mixture formed from
a1) 40 to 70% by weight of nylon-6,6 or nylon-4,6 or nylon-6 or mixtures thereof,
a2) 30 to 60% by weight of a polyamide having a ratio of methylene to amide groups of 7 to 12,
B) 1 to 50% by weight of a fibrous or particulate filler,
C) 0.05 to 3% by weight of an ion-free lubricant,
D) 0.05 to 3% by weight of a heat stabilizer,
E) 0 to 40% by weight of further additives,
where the sum of the percentages by weight A) to E) and a1) and a2) adds to 100% by mixing components A) through E) to form a mixture, and then extruding the mixture, and producing a stress cracking- and corrosion-resistant molding comprising the mixture.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the thermoplastic molding material is used to produce moldings which are resistant to CaCl2 and/or zinc chloride or aqueous solutions thereof.

### Claim 3 (depends on 1)

The method according to claim 1, wherein component
a1) is present in amounts of 60 to 50% by weight and
a2) is present in amounts of 40 to 50% by weight
in the molding materials, based on 100% of A).

### Claim 4 (depends on 1)

The method according to claim 1, wherein component C) is an oxidized polyolefin wax or a higher fatty acid having 10 to 44 carbon atoms.

### Claim 5 (depends on 1)

The method according to claim 1, wherein component D) comprises Cu(I) halide in a mixture with KI in a molar ratio of 1:4.

### Claim 6 (depends on 1)

The method according to claim 1, wherein component D) is formed from an aromatic secondary amine.

### Claim 7 (depends on 1)

A molding, fiber or film obtained from the usable molding materials according to claim 1.

### Claim 8 (depends on 7)

The molding according to claim 7, which is used as a domestic item, electronic component, medical appliance, motor vehicle component, housing of an electrical appliance, housing of an electronic component in a motor vehicle, wheel surround, door panel, tail gate, spoiler, intake manifold, water tank, other tank, fan impeller or casing, hose, pump component, oil sump, engine mount, housing of a power tool, housing of electronic components (in general), insert molding of electronic components (e.g. coils, circuit boards, sensors).