# US 8,772,397 B2 · Heat stabilized moulding composition

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- Number: US 8,772,397 B2
- Document ID: US8772397B2
- Status: Granted
- Kind: B2
- Application number: 11/794,334
- Filed: 2006-01-09
- Published: 2008-06-19
- Granted: 2014-07-08
- Earliest claimed: 2005-01-12
- Assignees: Dsm IP Assets B.V.
- Applicants: Pieter Gijsman; Wilhelmus J. M. Sour; Rudy Rulkens; Robert H. C. Janssen
- Inventors: Pieter Gijsman; Wilhelmus J. M. Sour; Rudy Rulkens; Robert H. C. Janssen
- Web page: https://patentgrep.com/patent/US8772397B2

## CPC

- C08K 3/08: Metals
- B29C 45/0001: {characterised by the choice of material}
- 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
- C08L 77/02: Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence)
- C08K 2003/0856: {Iron}
- C08L 2201/08: Stabilised against heat, light or radiation or oxydation
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Non-fibrous-reinforced thermoplastic moulding compositions comprising a metal powder as a heat stabilizer are provided. The metal powder has a weight average particle size (dm) of at most 1 mm and the metal in the metal powder is selected from the group consisting of elementary metals from Group VB, VIB, VIIB and VIIIB of the Periodic Table, and mixtures thereof. A thermoplastic polyamide is also provided with an Mw of at most 50,000 g/mol, or a blend of at least two thermoplastic polymers with Tmelt or Tg differing by at least 20° C., or a second thermostabilizer. The invention also relates to the use of these compositions in high temperature applications.

## Claims

### Claim 1

A thermoplastic moulding composition comprising:
a) a polymer composition comprising at least one thermoplastic polyamide selected from the group consisting of polyamide-6, polyamide-6,6 and mixtures thereof having a weight average molecular mass Mw of at most 50,000 g/mol;
b) 0.20 to 5 parts by weight (pbw) relative to 100 pbw of the polymer composition in the moulding composition of a first thermo-stabilizing system consisting of finely dispersed elementary iron powder having a weight average particle size (dm) of at most 100 μm; and
c) 0.001-2 pbw relative to 100 pbw of the polymer composition in the moulding composition of a second thermo-stabilizing system consisting of a copper salt, wherein
the moulding composition exhibits reduced deterioration when exposed to an elevated temperature of 215° C. for a prolonged time period of 500 hours as compared to an identical moulding composition including a CuI/KI stabilization system but not including the elementary iron powder.

### Claim 2 (depends on 1)

The moulding composition as in claim 1, wherein the copper salt is a copper halogenide/alkalihalogenide combination.

### Claim 3 (depends on 2)

The moulding composition as in claim 2, wherein the copper salt is CuI/KI.

### Claim 4 (depends on 1, 2, 3)

A moulded part which comprises the moulding composition according to any one of claims 1-3.