Patent US5268414A successfully refreshed from Google Patents.
US5268414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-crystal polyester resin composition which exhibits excellent high temperature stability
Assignee: Polyplastics Co Ltd
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Filing: 1991-11-08
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Granted: 1993-12-07
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Expires: 2011-11-08
Abstract
Abstract A liquid-crystal polyester resin composition comprises a melt-processable polyester which can form an anisotropic molten phase by heating (liquid-crystal polyester) and a silicone rubber.
Inventors
- 👤 Mikio Nakai
- 👤 Takayuki Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:42
CPC Classifications
C; C08; C08L; C08L67/00; C08L77/00; C08L77/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A liquid-crystal polyester composition which exhibits excellent high temperature stability as evidenced by the ability to form molded articles which when heated at 270° C. for one hour possess no visible surface blistering comprising a melt-processable thermoplastic polyester which forms an anisotropic molten phase and exhibits an intrinsic viscosity of approximately 2.0 to 10 dl./g. when dissolved in a concentration of 0.1 percent by weight in pentafluorophenol at 60° C., 1.0 to 70 percent by weight of an inorganic filler based upon the weight of the composition, and 1 to 5 percent by weight of a crosslinked silicone rubber formed through an addition reaction well dispersed therein having a mean particle diameter of 1 to 20 μm. based upon the weight of the composition.
Claim 2
Dependent Claim
124 words
A liquid-crystal polyester composition which exhibits excellent high temperature stability as evidenced by the ability to form molded articles which when heated at 270° C. for one hour possess no visible surface blistering comprising a melt-processable thermoplastic polyester which forms an anisotropic molten phase and exhibits an intrinsic viscosity of approximately 2.0 to 10 dl./g. when dissolved in a concentration of 0.1 percent by weight in pentafluorophenol at 60° C., 1.0 to 70 percent by weight of an inorganic filler based upon the weight of the composition, and 1 to 5 percent by weight of a crosslinked silicone rubber formed through an addition reaction well dispersed therein having a mean particle diameter of 1 to 20 μm. based upon the weight of the composition.
Claim 3
Dependent Claim
34 words
A liquid-crystal polyester composition according to claim 1 wherein said melt-processable polyester which forms an anisotropic melt phase comprises 70 mole percent of recurring 4-oxybenzoyl units and 30 mole percent of recurring 6-oxy-2-naphthoyl units.
Claim 4
Dependent Claim
35 words
A liquid-crystal polyester composition according to claim 1 wherein said crosslinked silicone rubber formed through an addition reaction is provided in a concentration of 5 percent by weight based upon the weight of the composition.
Claim 5
Dependent Claim
37 words
A liquid-crystal polyester composition according to claim 1 wherein said crosslinked silicone rubber was formed through an addition reaction, with hydrosilylation of a ##STR7## group to an unsaturated group in the presence of a palladium compound catalyst.
Claim 6
Dependent Claim
46 words
A liquid-crystal polyester composition according to claim 1 wherein said crosslinked silicone rubber formed through an addition reaction was prepared by reacting a dimethylpolysiloxane having a vinyl group with a dimethylpolysiloxane having a ##STR8## group in the presence of a palladium compound catalyst with addition crosslinking.
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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) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |