Patent US4456723A successfully refreshed from Google Patents.
US4456723A
Expired / Lapsed
US
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Thermoplastic moulding composition and the use thereof
Assignee: DuPont de Nemours Deutschland GmbH
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Filing: 1982-10-21
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Granted: 1984-06-26
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Expires: 2002-10-21
Abstract
Abstract Moulding compositions based on thermoplastic polymers, which compositions optionally contain fillers, reinforcing fillers and/or fire-retarding agents, have improved tracking resistance, and, in the case where a noninflammable finish has been imparted, they reduce both the corrosiveness on contact metals and the dripping tendency.
Inventors
- 👤 Franz Breitenfellner
- 👤 Thomas Kainmuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:11
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; C; C08; C08K; C08K3/00; C08K3/32; C08K5/00; C08K5/16; C08K5/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
38 words
A moulding composition for casting, moulding or injection moulding, having improved tracking resistance which comprises (a) 99.7 to 60% by weight of a thermoplastic polyester, and (b) 0.3 to 40% by weight of a substantially water-free calcium phosphate.
Claim 2
Dependent Claim
38 words
A moulding composition for casting, moulding or injection moulding, having improved tracking resistance which comprises (a) 99.7 to 60% by weight of a thermoplastic polyester, and (b) 0.3 to 40% by weight of a substantially water-free calcium phosphate.
Claim 3
Dependent Claim
14 words
A moulding composition according to claim 1, wherein the polyester is a straight-chain polyester.
Claim 4
Dependent Claim
28 words
A moulding composition according to claim 2, wherein the polyester is a polyethylene terephthalate or a poly-1,4-butylene terephthalate, or a copolyester based on polyethylene terephthalate or poly-1,4-butylene terephthalate.
Claim 5
Dependent Claim
14 words
A moulding composition according to claim 2 wherein the polyester is a polyalkylene terephthalate.
Claim 6
Dependent Claim
23 words
A moulding composition according to claim 1, which additionally contains 3 to 30% by weight, relative to the polymer, of a fire-retarding additive.
Claim 7
Dependent Claim
51 words
A moulding composition according to claim 1, which contains, besides a fire-retarding additive, 5 to 55% by weight, relative to the polymer, of a filler or reinforcing filler or mixture thereof, the total amount of calcium phosphate and fillers being not more than 60% by weight, relative to the total mixture.
Claim 8
Dependent Claim
28 words
A moulding composition according to claim 1, wherein the calcium phosphate is a hydrogen phosphate, phosphate, hydroxide apatite or halide apatite, a metaphosphate, a polyphosphate or an ultraphosphate.
Claim 9
Dependent Claim
37 words
A moulding composition according to claim 7, wherein the calcium phosphate is CaHPO 4 , Ca 3 (PO 4 ) 2 , Ca 5 (PO 4 ) 3 (OH) or Ca 5 (PO 4 ) 3 (F,Cl).
Claim 10
Dependent Claim
41 words
A process for improving the tracking resistance of thermoplastic polyesters, and for reducing the corrosiveness of thermoplastic polyesters which have been rendered noninflammable, which process comprises incorporating into the polyester 0.3 to 40% by weight of a substantially water-free calcium phosphate.
Claim 11
Dependent Claim
41 words
A process for improving the tracking resistance of thermoplastic polyesters, and for reducing the corrosiveness of thermoplastic polyesters which have been rendered noninflammable, which process comprises incorporating into the polyester 0.3 to 40% by weight of a substantially water-free calcium phosphate.
References Cited (Backward Citations)
GB1179155A
Cited
US3980611A
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US4000109A
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US4052356A
Cited
US4043971A
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US4212793A
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GB2057454A
Cited
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US4366279A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |