EP0678113A1 - Formzusammensetzungen enthaltend nylon - Google Patents
Formzusammensetzungen enthaltend nylonInfo
- Publication number
- EP0678113A1 EP0678113A1 EP94900968A EP94900968A EP0678113A1 EP 0678113 A1 EP0678113 A1 EP 0678113A1 EP 94900968 A EP94900968 A EP 94900968A EP 94900968 A EP94900968 A EP 94900968A EP 0678113 A1 EP0678113 A1 EP 0678113A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- moulding
- nylon
- composition
- magnesium hydroxide
- caprolactam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3432—Six-membered rings
Definitions
- This invention is concerned with moulding compositions which contain nylon, e.g. nylon 6 or nylon 66, and is especially concerned with such compositions which contain magnesium hydroxide as a flame retardant.
- Nylon is widely used for moulding components.
- Nylon 6 is produced from caprolactam with the polymerised product containing about 90% of nylon and about 10% of low molecular weight material such as the monomer. Before such a polymerised product is used for moulding, it is washed to remove the monomer. The unwashed product is known as "unwashed nylon” or as "high monomer nylon”. In some moulding applications, it is desirable that the moulded component exhibits flame retardant characteristics. Such applications include electrical lamp-holders, and switch housings.
- Magnesium hydroxide is a flame retardant which has been suggested for use with nylon. This material, when subjected to a flame, decomposes endothermically with the liberation of water. Nylon containing magnesium hydroxide has been found to be difficult to mould because of its high melt viscosity and, furthermore, it is found that the mouldings have obvious surface defects which render them unacceptable commercially. Such surface defects manifest themselves by the appearance of white patches on the surface of the moulding. Various attempts have been made to overcome this problem but without achieving complete success. The most successful previous attempt known to the applicants involves the addition of organic sulphonamide (see GB 2,237,573A) but even this has not achieved total success.
- the invention provides a moulding composition containing nylon and magnesium hydroxide as a flame- retardant, characterised in that the composition also contains sufficient caprolacta to reduce the formation of surface defects in the moulding.
- Mouldings made from a composition according to the invention are found to be substantially free of surface defects. Furthermore, such compositions are also found to be much easier to mould.
- the caprolactam can be provided by the use of unwashed nylon in the composition, possibly with the addition of further caprolactam. Alternatively, if the nylon has been washed, the caprolactam is added.
- the caprolactam may be present in up to 10% by weight e.g. between 1% and 5%.
- a composition according to the invention may contain up to 60% by weight of magnesium hydroxide e.g. between 45% and 65%. Alternatively, if a lower flame retardant standard is acceptable, the composition may contain 20-45% by weight of magnesium hydroxide.
- the composition may also contain reinforcing fibres, e.g. glass fibres, which may be present in up to 35% by weight depending on the amount of magnesium hydroxide which is present.
- the first illustrative composition contained 37.01% by weight of unwashed nylon which contained about 10% of caprolactam and about 2.5% of water.
- the composition also contained 0.30% by weight of calcium stearate (as a mould lubricate), 9.82% of glass fibre as a reinforcement, and 52.87% of magnesium hydroxide as a flame retardant.
- the constituents were mixed together in a blender and fed into a compounder through the main hopper.
- the compounder was a Baker Perkins 2030 twin screw extruder operating with a barrel temperature of 260°C (feed region at 180°C) , a feed rate of 9 to 12 kg/hour, and a screw speed of 250 RPM. The material was found to be easy to extrude and the extruded strand did not break.
- Test rods were injection moulded from the first illustrative moulding composition using a Battenfeld BA 750 CD Plus injection moulding machine.
- the barrel temperature was 280°C and the mould temperature 115°C.
- the test rods were easy to mould and were found to have a very good surface finish with hardly any defects.
- the second illustrative composition contained 34.98% by weight of the same unwashed nylon as the first illustrative composition. It also contained 0.30% of calcium stearate, 14.75% of glass fibres, and 49.97% of magnesium hydroxide. It was mixed, compounded and injection moulded into test rods in the same way as the first illustrative composition. The mouldability and surface finish were substantially the same as for the first illustrative composition.
- the second illustrative composition was moulded into lamp-holders and the surface finish was found to be excellent. These lamp-holders also passed the Underwriters Laboratory Inc. flammability test (UL 94 test) with a rating of Vo at 1.5mm and had good impact strength.
- UL 94 test Underwriters Laboratory Inc. flammability test
- a moulding composition falling outside the invention was mixed, compounded and injection moulded into test rods under the same conditions as the first and the second illustrative compositions.
- This composition contained 35.88% by weight of washed nylon 6, 0.35% calcium stearate, 10% glass fibre and 53.82% magnesium hydroxide. The material was difficult to extrude as strand breakage occurred, and was difficult to injection mould taking 10% longer.
- the test bar surfaces were covered in white marks.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9300308 | 1993-01-08 | ||
GB9300308A GB2274109B (en) | 1993-01-08 | 1993-01-08 | Moulding compositions containing nylon |
PCT/GB1993/002485 WO1994016015A1 (en) | 1993-01-08 | 1993-12-02 | Moulding compositions containing nylon |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0678113A1 true EP0678113A1 (de) | 1995-10-25 |
Family
ID=10728464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94900968A Withdrawn EP0678113A1 (de) | 1993-01-08 | 1993-12-02 | Formzusammensetzungen enthaltend nylon |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0678113A1 (de) |
GB (1) | GB2274109B (de) |
WO (1) | WO1994016015A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997010303A1 (en) * | 1995-09-13 | 1997-03-20 | Du Pont | Thermoplastic resin composition |
US7790789B2 (en) * | 2003-11-18 | 2010-09-07 | Honeywell International, Inc. | Pre-fiber gel materials and compositions, methods of manufacture and uses thereof |
US7258920B2 (en) * | 2003-11-18 | 2007-08-21 | Honeywell International Inc. | Multiphase fiber materials and compositions, methods of manufacture and uses thereof |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE622933A (de) * | 1961-09-27 | 1900-01-01 | ||
DE4221925A1 (de) * | 1992-07-03 | 1994-01-05 | Bayer Ag | Schwerentflammbare Polyamidformmassen |
-
1993
- 1993-01-08 GB GB9300308A patent/GB2274109B/en not_active Expired - Fee Related
- 1993-12-02 WO PCT/GB1993/002485 patent/WO1994016015A1/en not_active Application Discontinuation
- 1993-12-02 EP EP94900968A patent/EP0678113A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9416015A1 * |
Also Published As
Publication number | Publication date |
---|---|
GB9300308D0 (en) | 1993-03-03 |
WO1994016015A1 (en) | 1994-07-21 |
GB2274109B (en) | 1996-07-03 |
GB2274109A (en) | 1994-07-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19950627 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19970306 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19971230 |