Patent US4521560A successfully refreshed from Google Patents.
US4521560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic polyester moulding composition containing flame retardant and magnesium sulfate
Assignee: DuPont de Nemours Deutschland GmbH
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Filing: 1983-06-30
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Granted: 1985-06-04
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Expires: 2003-06-30
Abstract
Abstract The invention relates to moulding compositions based on thermoplastic polyesters and containing finely particulate calcined magnesium sulfate. The moulded articles obtained with these compositions have increased stiffness and tracking resistance, this latter also in the presence of flame retardants and/or a reinforcing filler.
Inventors
- 👤 Franz Breitenfellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:48
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/422; C; C08; C08K; C08K3/00; C08K3/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
A thermoplastic polyester moulding composition which comprises, based on the total composition, (a) 40 to 95% by weight of a thermoplastic polyester, (b) 5 to 60% by weight of finely particulate calcined magnesium sulfate, and (c) 3 to 25% by weight, based on the polyester, of a flame-proofing additive, which is a mixture of decabromodiphenyl oxide and antimony trioxide.
Claim 2
Dependent Claim
59 words
A thermoplastic polyester moulding composition which comprises, based on the total composition, (a) 40 to 95% by weight of a thermoplastic polyester, (b) 5 to 60% by weight of finely particulate calcined magnesium sulfate, and (c) 3 to 25% by weight, based on the polyester, of a flame-proofing additive, which is a mixture of decabromodiphenyl oxide and antimony trioxide.
Claim 3
Dependent Claim
14 words
A moulding composition according to claim 1, wherein the polyester is a polyalkylene terephthalate.
Claim 4
Dependent Claim
27 words
A moulding composition according to claim 2, wherein the polyester is a polyethylene terephthalate or poly-1,4-butylene terephthalate or a copolyester based on polyethylene terephthalate or poly-1,4-butylene terephthalate.
Claim 5
Dependent Claim
18 words
A moulding composition according to claim 1, which contains 5 to 40% by weight of calcined magnesium sulfate.
Claim 6
Dependent Claim
97 words
A thermoplastic polyester moulding composition which comprises, based on the total composition. (a) 40 to 95% by weight of a thermoplastic polyester, (b) 5 to 60% by weight of finely particulate calcined magnesium sulfate, and (c) a reinforcing filler which is selected from the group consisting of glass fibers and kaolin, such that the amount of filler and calcined magnesium sulfate is at most 60% by weight, based on the total composition, and (d) 3 to 25% by weight, based on the polyester, of a flame-proofing additive, which is a mixture of decabromodiphenyl oxide and antimony trioxide.
Claim 7
Dependent Claim
97 words
A thermoplastic polyester moulding composition which comprises, based on the total composition. (a) 40 to 95% by weight of a thermoplastic polyester, (b) 5 to 60% by weight of finely particulate calcined magnesium sulfate, and (c) a reinforcing filler which is selected from the group consisting of glass fibers and kaolin, such that the amount of filler and calcined magnesium sulfate is at most 60% by weight, based on the total composition, and (d) 3 to 25% by weight, based on the polyester, of a flame-proofing additive, which is a mixture of decabromodiphenyl oxide and antimony trioxide.
Claim 8
Dependent Claim
14 words
A moulding composition according to claim 5, wherein the polyester is a polyalkylene terephthalate.
Claim 9
Dependent Claim
27 words
A moulding composition according to claim 6, wherein the polyester is a polyethylene terephthalate or poly-1,4-butylene terephthalate or a copolyester based on polyethylene terephthalate or poly-1,4-butylene terephthalate.
Claim 10
Dependent Claim
15 words
A moulding composition according to claim 5, wherein the reinforcing filler consists of glass fibers.
Claim 11
Dependent Claim
18 words
A moulding composition according to claim 5, which contains 5 to 40% by weight of calcined magnesium sulfate.
Claim 12
Dependent Claim
27 words
A moulding composition according to claim 5, which contains 5 to 40% by weight of calcined magnesium sulfate and 5 to 55% by weight of glass fibers.
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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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |