US4851467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding compositions comprising wholly aromatic polymers which contain carbon black
Assignee: BP Corp North America Inc
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Filing: 1988-04-08
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Granted: 1989-07-25
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Expires: 2008-04-08
Abstract
Abstract This invention relates to molding compositions comprising wholly aromatic polyesters which contain carbon black, wherein the molding compositions exhibit a uniform color and can be molded into strong thermally stable articles.
Inventors
- 👤 Paul D. Frayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:15
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A polyester molding composition comprising at least about 35%, by weight, of a wholly aromatic polyester and about 0.5% to 5%, by weight, of a carbon black having a particle size between about 25 and 75 microns in diameter and containing a minimal amount of inherent volatiles such that during molding at elevated temperatures, the composition does not foam or exhibit an undesirable reduction in melt viscosity, wherein the carbon black has a total surface area of between approximately 40 and 100 square meters per gram and contains inherent volatiles of less than 1.2%, by weight.
Claim 2
Dependent Claim
96 words
A polyester molding composition comprising at least about 35%, by weight, of a wholly aromatic polyester and about 0.5% to 5%, by weight, of a carbon black having a particle size between about 25 and 75 microns in diameter and containing a minimal amount of inherent volatiles such that during molding at elevated temperatures, the composition does not foam or exhibit an undesirable reduction in melt viscosity, wherein the carbon black has a total surface area of between approximately 40 and 100 square meters per gram and contains inherent volatiles of less than 1.2%, by weight.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein the carbon black contains inherent volatiles of between approximately 0% and 0.9%, by weight.
Claim 4
Dependent Claim
13 words
The composition of claim 1 wherein the aromatic polyester is an oxybenzoyl copolyester.
Claim 5
Dependent Claim
50 words
The composition of claim 3 wherein the wholly aromatic polyester comprises recurrent moieties selected from the following formulae: ##STR3## where X is --O--, --S--, --CO--, or --SO2; and m and n are independently zero or one, and the total of the integers p+q+r+s+t+u is from approximately 3 to about 800.
Claim 6
Dependent Claim
28 words
The composition of claim 4 wherein each of the ratios q:r, q:u, t:r, t:u, q+t:r, q+t:r+u, and t:r+u, of the moieties present, is about 10:11 to about 11:10.
Claim 7
Dependent Claim
13 words
The composition of claim 5 wherein each of the ratios is about 10:10.
Claim 8
Dependent Claim
9 words
The composition of claim 4 wherein n is zero.
Claim 9
Dependent Claim
82 words
The composition of claim 4 wherein the wholly aromatic polyester comprises recurrent moieties selected from the following formulae: ##STR4## wherein the total of the integers p+q+r is about 3 to 800, the carbonyl groups of the moiety of formula VII or VIII are linked to the oxy groups of the moiety of formula VII or IX; and the oxy groups of the moiety of formula VII or IX are linked to the carbonyl groups of the moiety of formula VII or VIII.
Claim 10
Dependent Claim
26 words
The composition of claim 8 wherein the wholly aromatic polyester comprises recurrent units of moieties VII, VIII and IX, wherein the molar ratios are 2:1:1 respectively.
Claim 11
Dependent Claim
95 words
A molded article comprising at least about 35%, by weight, of a wholly aromatic polyester and about 0.5% to 5%, by weight, of a carbon black having a particle size between about 25 and 75 microns in diameter and containing a minimal amount of inherent volatiles such that, during molding at elevated temperatures, the composition does not foam or exhibit an undesirable reduction in melt viscosity, wherein the carbon black has a total surface area of between approximately 40 and 100 square meters per gram and contains inherent volatiles of less than 1.2%, by weight.
Claim 12
Dependent Claim
95 words
A molded article comprising at least about 35%, by weight, of a wholly aromatic polyester and about 0.5% to 5%, by weight, of a carbon black having a particle size between about 25 and 75 microns in diameter and containing a minimal amount of inherent volatiles such that, during molding at elevated temperatures, the composition does not foam or exhibit an undesirable reduction in melt viscosity, wherein the carbon black has a total surface area of between approximately 40 and 100 square meters per gram and contains inherent volatiles of less than 1.2%, by weight.
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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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |