Patent US4626557A successfully refreshed from Google Patents.
US4626557A
Expired / Lapsed
US
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Plastic ovenware containing talc
Assignee: Syensqo Specialty Polymers USA LLC
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Filing: 1985-04-24
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Granted: 1986-12-02
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Expires: 2005-04-24
Abstract
Abstract Permanent ovenware capable of repeated use in both conventional thermal and microwave ovens fabricated from wholly aromatic polyester compositions and, more particularly, from oxybenzoyl polyester compositions containing up to about 60% of talc having present a minimum content of material decomposable at elevated temperatures.
Inventors
- 👤 Joseph J. Duska
- 👤 Arnold B. Finestone
- 👤 John B. Maher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:53
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
96 words
A molded article of permanent ovenware, comprising at least about 35% by weight of a wholly aromatic polyester and about 1 to 60% by weight of a talc containing a minimum amount of materials decomposable at elevated temperatures characterized by a weight loss on ignition of not more than about 6% by weight at 950° C. and 2% by weight at 800° C. and having an iron content of not more than about 1.0% by weight analyzed as iron oxide, such that the ovenware is not blistered or bubbled or cracked during molding or oven use.
Claim 2
Dependent Claim
96 words
A molded article of permanent ovenware, comprising at least about 35% by weight of a wholly aromatic polyester and about 1 to 60% by weight of a talc containing a minimum amount of materials decomposable at elevated temperatures characterized by a weight loss on ignition of not more than about 6% by weight at 950° C. and 2% by weight at 800° C. and having an iron content of not more than about 1.0% by weight analyzed as iron oxide, such that the ovenware is not blistered or bubbled or cracked during molding or oven use.
Claim 3
Dependent Claim
26 words
The article of claim 1 wherein the talc is selected from the group consisting of high purity talc, highly refined talc, calcined talc and acid-treated talc.
Claim 4
Dependent Claim
15 words
The article of claim 1 comprising about 35 to 55% by weight of said talc.
Claim 5
Dependent Claim
27 words
The article of claim 1 wherein said talc comprises a particle size distribution in which at least about 95% of the particles are less than about 40μ.
Claim 6
Dependent Claim
15 words
The article of claim 1 comprising about 2 to 20% by weight of titanium dioxide.
Claim 7
Dependent Claim
15 words
The article of claim 5 comprising about 5 to 15% by weight of titanium dioxide.
Claim 8
Dependent Claim
13 words
The article of claim 1 wherein the aromatic polyester is an oxybenzoyl polyester.
Claim 9
Dependent Claim
41 words
The article of claim 7 wherein the oxybenzoyl polyester comprises recurrent moieties selected from the following formulas: ##STR5## where X is O, S, CO, NH, or SO 2 ; n is zero or one; and p+q+r+s+t+u is about 3 to 800.
Claim 10
Dependent Claim
26 words
The article of claim 8 wherein each of the ratios q:r, q:u, t:r, t:u, (q+t):(r+u), and t:(r+u) of the moieties present is about 10:10 to 11:10.
Claim 11
Dependent Claim
13 words
The article of claim 9 wherein each of said ratios is about 10:10.
Claim 12
Dependent Claim
9 words
The article of claim 8 wherein n is zero.
Claim 13
Dependent Claim
104 words
The article of claim 7 wherein the oxybenzoyl polyester comprises recurrent moieties selected from the following formulas: ##STR6## where X is O or SO 2 ; m is zero or one; n is zero or one; q:r is about 10:15 to 15:10; p:q is about 1:100 to 100:1; p+q+r is about 3 to 600; the carbonyl groups of the moiety of formula VII or VIII are linked to the oxy groups of the moiety 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 14
Dependent Claim
17 words
The article of claim 7 wherein the oxybenzoyl polyester comprises recurrent units of the following formula: ##STR7##
Claim 15
Dependent Claim
96 words
A molding composition for permanent ovenware, comprising at least about 35% by weight of a wholly aromatic polyester and about 1 to 60% by weight of a talc containing a minimum amount of materials decomposable at elevated temperatures characterized by a weight loss on ignition of not more than about 6% by weight at 950° C. and 2% by weight at 800° C. and having an iron content of not more than about 1.0% by weight analyzed as iron oxide, such that during molding at elevated temperatures said composition is not blistered or bubbled or cracked.
Claim 16
Dependent Claim
96 words
A molding composition for permanent ovenware, comprising at least about 35% by weight of a wholly aromatic polyester and about 1 to 60% by weight of a talc containing a minimum amount of materials decomposable at elevated temperatures characterized by a weight loss on ignition of not more than about 6% by weight at 950° C. and 2% by weight at 800° C. and having an iron content of not more than about 1.0% by weight analyzed as iron oxide, such that during molding at elevated temperatures said composition is not blistered or bubbled or cracked.
Claim 17
Dependent Claim
26 words
The composition of claim 14 wherein the talc is selected from the group consisting of high purity talc, highly refined talc, calcined talc and acid-treated talc.
Claim 18
Dependent Claim
15 words
The composition of claim 14 comprising about 35 to 55% by weight of said talc.
Claim 19
Dependent Claim
27 words
The article of claim 14 wherein said talc comprises a particle size distribution in which at least about 95% of the particles are less than about 40μ.
Claim 20
Dependent Claim
15 words
The composition of claim 14 comprising about 2 to 20% by weight of titanium dioxide.
Claim 21
Dependent Claim
15 words
The composition of claim 18 comprising about 5 to 15% by weight of titanium dioxide.
Claim 22
Dependent Claim
13 words
The composition of claim 14 wherein the aromatic polyester is an oxybenzoyl polyester.
Claim 23
Dependent Claim
41 words
The composition of claim 20 wherein the oxybenzoyl polyester comprises recurrent moieties selected from the following formulas: ##STR8## where X is O, S, CO, NH, or SO 2 ; n is zero or one; and p+q+r+s+t+u is about 3 to 800.
Claim 24
Dependent Claim
26 words
The composition of claim 21 wherein each of the ratios q:r, q:u, t:r, t:u, (q+t):(r+u), and t:(r+u) of the moieties present is about 10:10 to 11:10.
Claim 25
Dependent Claim
13 words
The composition of claim 22 wherein each of said ratios is about 10:10.
Claim 26
Dependent Claim
9 words
The composition of claim 21 wherein n is zero.
Claim 27
Dependent Claim
105 words
The composition of claim 20 wherein the oxybenzoyl polyester comprises recurrent moieties selected from the following formulas: ##STR9## where X is O or SO 2 ; m is zero or one; n is zero or one; q:r is about 10:15 to 15:10; p:q is about 1:100 to 100:1; p+q+r is about 3 to 600; 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 28
Dependent Claim
17 words
The composition of claim 20 wherein the oxybenzoyl polyester comprises recurrent units of the following formula: ##STR10##
Claim 29
Dependent Claim
106 words
A molded article of nonblistering permanent ovenware comprising: at least about 35% by weight of an oxybenzoyl polyester; about 35 to 55% by weight of a talc, having a minimum content of materials decomposable at elevated temperatures characterized as a weight loss on ignition of not more than about 6% by weight of 950° C. and 2% by weight at 800° C., an iron content of not more than about 1% by weight analyzed as iron oxide, and a particle size distribution in which at least about 95% of the particles are less than about 40μ; and about 2 to 20% by weight of titanium dioxide.
Claim 30
Dependent Claim
106 words
A molded article of nonblistering permanent ovenware comprising: at least about 35% by weight of an oxybenzoyl polyester; about 35 to 55% by weight of a talc, having a minimum content of materials decomposable at elevated temperatures characterized as a weight loss on ignition of not more than about 6% by weight of 950° C. and 2% by weight at 800° C., an iron content of not more than about 1% by weight analyzed as iron oxide, and a particle size distribution in which at least about 95% of the particles are less than about 40μ; and about 2 to 20% by weight of titanium dioxide.
Claim 31
Dependent Claim
92 words
A molding composition for permanent ovenware, comprising at least about 35% to 85% by weight of a wholly aromatic polyester and about 35 to 55% by weight of a talc containing a minimum amount of materials decomposable at elevated temperatures characterized by a weight loss on ignition of not more than about 6% by weight at 950° C. and 2% by weight at 800° C., and having an iron content of not more than about 0.6% by weight analyzed as iron oxide, and about 2 to 20% by weight of titanium dioxide.
Claim 32
Dependent Claim
92 words
A molding composition for permanent ovenware, comprising at least about 35% to 85% by weight of a wholly aromatic polyester and about 35 to 55% by weight of a talc containing a minimum amount of materials decomposable at elevated temperatures characterized by a weight loss on ignition of not more than about 6% by weight at 950° C. and 2% by weight at 800° C., and having an iron content of not more than about 0.6% by weight analyzed as iron oxide, and about 2 to 20% by weight of titanium dioxide.
References Cited (Backward Citations)
GB1592204A
Cited
US4244859A
Cited
GB2011439A
Cited
US4219629A
Cited
WO1980002430A1
Cited
GB2058102A
Cited
EP0044175A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |