US4900784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PBT-PC-rubber-brominated FR high tracking resistance+VO
Assignee: SABIC Global Technologies BV
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Filing: 1988-11-10
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Granted: 1990-02-13
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Expires: 2008-11-10
Abstract
Abstract The invention relates to polymer mixtures having a comparative tracking index of more than 400 volts (KC) and a VO-value according to UL-94. The polymer mixtures according to the invention comprise a polybutylene teraphthalate, an aromatic polycarbonate, a brominated polystyrene, and an agent to improve the impact strength.
Inventors
- 👤 Farshid M. H. Tabankia
- 👤 Jan De Boer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:23
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
45 words
A polymer mixture which consists of the following constituents: a. a polybutylene terephthalate; b. a brominated polystyrene as a flame retardant, characterized in that the polymer mixture moreover consists of the following constituents; c. an aromatic polycarbonate; and d. agent to improve the impact strength.
Claim 2
Dependent Claim
45 words
A polymer mixture which consists of the following constituents: a. a polybutylene terephthalate; b. a brominated polystyrene as a flame retardant, characterized in that the polymer mixture moreover consists of the following constituents; c. an aromatic polycarbonate; and d. agent to improve the impact strength.
Claim 3
Dependent Claim
66 words
A polymer mixture as claimed in claim 1, wherein the polymer mixture consisting of a. 60-85% by weight of polybutylene terephthalate, b. 5-20% by weight of brominated polystyrene, c. 5-25% by weight of aromatic polycarbonate, and d. 5-15% by weight of the agent to improve the impact strength, the weight percentages being calculated with respect to the sum of the constituents a, b, c, and d.
Claim 4
Dependent Claim
35 words
A polymer mixture as claimed in claim 1, wherein constituent a. is a polymer or a copolymer which is built up for more than 70 mol % from units derived from terephthalic acid and butane-1,4-diol.
Claim 5
Dependent Claim
24 words
A polymer mixture as claimed in claim 1, wherein the polymer mixture consists of a metal compound which cooperates synergistically with the brominated polystyrene.
Claim 6
Dependent Claim
35 words
A polymer mixture as claimed in claim 1, wherein agent c. is a core-shell copolymer prepared in various stages and built up from a rubber-like core on which one or more shells have been grafted.
Claim 7
Dependent Claim
46 words
A polymer mixture as claimed in claim 1, wherein, in addition to the constituents mentioned hereinbefore sub a, b, c, and d, the polymer mixture consists of 1-100 parts by weight of additives per 100 parts by weight of a. plus b. plus c. plus d.
Claim 8
Dependent Claim
11 words
Articles formed from the polymer mixture as claimed in claim 1.
References Cited (Backward Citations)
US3169121A
Cited
US3864428A
Cited
US4001184A
Cited
GB1568625A
Cited
EP0020605A1
Cited
US4417018A
Cited
EP0079477A1
Cited
EP0107048A1
Cited
EP0110222A1
Cited
US4535124A
Cited
US4539370A
Cited
EP0158822A1
Cited
US4554315A
Cited
US4636544A
Cited
US4629760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |