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US4548972A
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Flame retardant polyamide compositions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1984-02-29
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Granted: 1985-10-22
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Expires: 2004-02-29
Abstract
Abstract A reinforced, fire retardant, polyamide composition containing (a) at least 35% by weight of a fibre-forming polyamide, (b) 15 to 30%, by weight of glass fibres or particulate fillers, (c) 15 to 30%, by weight of melamine demi-sulphate, (d) at least 2.5%, by weight of a halogenated compound selected from the condensation product of 2 moles chlorocylopentadiene and 1 mole of 1,5-cyclooctadiene, brominated polystyrene, brominated polyphenylene oxide or a brominated epoxy resin, and (e) a synergist selected from at least one of zinc borate, zinc oxide and mixtures of antimony oxide and zinc borate, wherein the concentration of oxide present is between 0 and 5%, the concentration of zinc borate is between 0 and 25%, preferably between 2 and 15% by weight and the total weight of synergist is at least 1% by weight and wherein the weight percentages of the constituents total 100%.
Inventors
- 👤 Ian G. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:34
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3477; C08K5/3492; C08K5/34928; C08K13/00; C08K13/02; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
A reinforced, fire retardant, polyamide composition characterised in that it contains: (a) at least 35% by weight of a fibre-forming polyamide, (b) 15 to 30%, by weight of glass fibres or particulate fillers, (c) 15 to 30%, by weight of melamine demi-sulphate, (d) at least 2.5% but no more than 10%, by weight of a halogenated compound selected from the condensation product of 2 moles chlorocyclopentadiene and 1 mole of 1,5-cylooctadiene, brominated polystyrene, brominated polyphenylene oxide or a brominated epoxy resin, and (e) a synergist selected from at least one of zinc borate, zinc oxide and mixtures of antimony oxide and zinc borate, wherein the concentration of oxide present is between 0 and 5%, the concentration of zinc borate is between 0 and 25%, and the total weight of synergist is at least 1by weight and wherein the weight percentages of the constitutents (a), (b), (c), (d) and (e) total 100%.
Claim 2
Dependent Claim
151 words
A reinforced, fire retardant, polyamide composition characterised in that it contains: (a) at least 35% by weight of a fibre-forming polyamide, (b) 15 to 30%, by weight of glass fibres or particulate fillers, (c) 15 to 30%, by weight of melamine demi-sulphate, (d) at least 2.5% but no more than 10%, by weight of a halogenated compound selected from the condensation product of 2 moles chlorocyclopentadiene and 1 mole of 1,5-cylooctadiene, brominated polystyrene, brominated polyphenylene oxide or a brominated epoxy resin, and (e) a synergist selected from at least one of zinc borate, zinc oxide and mixtures of antimony oxide and zinc borate, wherein the concentration of oxide present is between 0 and 5%, the concentration of zinc borate is between 0 and 25%, and the total weight of synergist is at least 1by weight and wherein the weight percentages of the constitutents (a), (b), (c), (d) and (e) total 100%.
Claim 3
Dependent Claim
23 words
A reinforced fire retardant polyamide composition according to claim 1 wherein the concentration of melamine demi-sulphate is between 16 and 27.5% by weight.
Claim 4
Dependent Claim
30 words
A reinforced, fire retardant polyamide composition according to either of claim 1 or claim 2 in which the concentration of condensation product (d) is between 3 and 10% by weight.
Claim 5
Dependent Claim
28 words
A reinforced, fire retardant polyamide composition according to claim 3 wherein the concentration of condensation product (d) is not greater than 5% by weight of the total composition.
Claim 6
Dependent Claim
36 words
A reinforced, fire retardant polyamide composition according to any one of claims 1 to 4 in which the concentration zinc borate, when present as synergist, is between 2 and 15% by weight of the total composition.
Claim 7
Dependent Claim
36 words
A reinforced, fire retardant polyamide composition according to any one of claims 1 to 4 in which the concentration of oxide, when present as synergist, is between 0.05 and 5% by weight of the total composition.
References Cited (Backward Citations)
GB1572497A
Cited
EP0001322A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |