US4020126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene terephthalate/terpolymer blends; films, sheets, and articles made using such blends; and method of making trays using such sheets
Assignee: EIDP Inc
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Filing: 1975-06-27
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Granted: 1977-04-26
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Expires: 1995-06-27
Abstract
Abstract Blends are provided including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with (a) at least 5% by weight of a vinyl ester of a lower (1-6 carbon) saturated monobasic aliphatic carboxylic acid and (b) 0.5 to 10% by weight of an acid of the group consisting of acrylic and methacrylic acids, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, said ester and said acid. Articles, such as cooking containers or trays, are provided made using such polyethylene terephthalate/terpolymer blends or made using sheets made from such blends. Such trays may be used for cooking food at temperatures up to about 400° F. Methods are provided of making such trays including thermoforming such sheets made from such blends.
Inventors
- 👤 Frederick W. Gander
- 👤 Erhard F. Hoegger
- 👤 William P. Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:33
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/24; C08K3/26; C08K3/34; C08L23/00; C08L23/02; C08L23/04; C08L23/08
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
85 words
A thermoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with (a) at least 5% by weight of a vinyl ester of a lower (1-6 carbon) saturated monobasic aliphatic carboxylic acid and (b) 0.5 to 10% by weight of an acid of the group consisting of acrylic and methacrylic acids, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, said ester and said acid.
Claim 2
Dependent Claim
85 words
A thermoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with (a) at least 5% by weight of a vinyl ester of a lower (1-6 carbon) saturated monobasic aliphatic carboxylic acid and (b) 0.5 to 10% by weight of an acid of the group consisting of acrylic and methacrylic acids, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, said ester and said acid.
Claim 3
Dependent Claim
83 words
A thermoformable sheet made from a blend including: 99 to 95% polyethylene terephtalate and 1 to 5% of a terpolymer of at least 65% ethylene with (a) 20 to 30% by weight of a vinylester of a 1-4 carbon saturated monobasic aliphatic carboxylic acid and (b) 0.5 to 10% by weight of an acid of the group consisting of acrylic and methacrylic acids, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, said ester and said acid.
Claim 4
Dependent Claim
83 words
A thermoformable sheet made from a blend including: 99 to 95% polyethylene terephtalate and 1 to 5% of a terpolymer of at least 65% ethylene with (a) 20 to 30% by weight of a vinylester of a 1-4 carbon saturated monobasic aliphatic carboxylic acid and (b) 0.5 to 10% by weight of an acid of the group consisting of acrylic and methacrylic acids, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, said ester and said acid.
Claim 5
Dependent Claim
83 words
A thermoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with (a) at least 12% by weight of a vinylester of a 1-4 carbon saturated monobasic aliphatic carboxylic acid and (b) 0.5 to 3% by weight of an acid of the group consisting of acrylic and methacrylic acids, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, said ester and said acid.
Claim 6
Dependent Claim
83 words
A thermoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with (a) at least 12% by weight of a vinylester of a 1-4 carbon saturated monobasic aliphatic carboxylic acid and (b) 0.5 to 3% by weight of an acid of the group consisting of acrylic and methacrylic acids, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, said ester and said acid.
Claim 7
Dependent Claim
84 words
a thermoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with (a) at least 12% by weight of a vinyl ester of a 1-4 carbon saturated monobasic aliphatic carboxylic acid and (b) 0.5 to 7% by weight of an acid of the group consisting of acrylic and methacrylic acids, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, said ester and said acid.
Claim 8
Dependent Claim
84 words
a thermoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with (a) at least 12% by weight of a vinyl ester of a 1-4 carbon saturated monobasic aliphatic carboxylic acid and (b) 0.5 to 7% by weight of an acid of the group consisting of acrylic and methacrylic acids, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, said ester and said acid.
Claim 9
Dependent Claim
61 words
A thermoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with 20 to 30% by weight vinyl acetate and 0.1 to 7% by weight methacrylic acid, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, vinyl acetate and methacrylic acid.
Claim 10
Dependent Claim
61 words
A thermoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with 20 to 30% by weight vinyl acetate and 0.1 to 7% by weight methacrylic acid, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, vinyl acetate and methacrylic acid.
Claim 11
Dependent Claim
61 words
A theremoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with 20 to 30% by weight vinyl acetate and 0.1 to 7% by weight acrylic acid, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, vinyl acetate and acrylic acid.
Claim 12
Dependent Claim
61 words
A theremoformable sheet made from a blend including: 99 to 95% polyethylene terephthalate and 1 to 5% of a terpolymer of at least 65% ethylene with 20 to 30% by weight vinyl acetate and 0.1 to 7% by weight acrylic acid, said terpolymer having been made by a free-radical initiated polymerization of a mixture of ethylene, vinyl acetate and acrylic acid.
Claim 13
Dependent Claim
12 words
A sheet according to claim 1 wherein the ester is vinyl acetate.
Claim 14
Dependent Claim
18 words
A sheet according to claim 1 wherein the ester is vinyl acetate and the acid is methacrylic acid.
Claim 15
Dependent Claim
18 words
A sheet according to claim 1 wherein the ester is vinyl acetate and the acid is acrylic acid.
Claim 16
Dependent Claim
19 words
A sheet of claim 1 wherein such terpolymer consists of 72% ethylene, 27% vinyl acetate, and 1% methacrylic acid.
Claim 17
Dependent Claim
24 words
The sheet of claim 1 wherein the polyethylene terephthalate contains from 0.1 to 1.5% by weight of a finely divided inert mineral solid substance.
Claim 18
Dependent Claim
14 words
The sheet of claim 1 wherein the polyethylene terephthalate contains talc and titanium dioxide.
Claim 19
Dependent Claim
13 words
The sheet of claim 1 wherein the polyethylene terephthalate contains a nucleating agent.
Claim 20
Dependent Claim
22 words
The sheet of claim 13 wherein the nucleating agent is selected from the group consisting of calcium carbonate, aluminum silicates, and talc.
Claim 21
Dependent Claim
16 words
The sheet of claim 1 wherein the polyethylene terephthalate contains a nucleating agent and opacifying agent.
Claim 22
Dependent Claim
12 words
The sheet of claim 15 wherein the opacifying agent is titanium dioxide.
Claim 23
Dependent Claim
16 words
The sheet of claim 15 wherein the polyethylene terephthalate contains 1% talc and 1.5% titanium dioxide.
Claim 24
Dependent Claim
16 words
The sheet of claim 1 wherein the terpolymer constitutes about 3% by weight of the blend.
Claim 25
Dependent Claim
17 words
The sheet of claim 1 wherein the inherent viscosity of the blend is from 0.70 to 0.95.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |