Patent EP0110672A2 successfully refreshed from Google Patents.
EP0110672A2
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Adherable reinforced poly(ethylene terephthalate) composite sheet and process
Assignee: EIDP Inc
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Filing: 1983-11-23
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Granted: —
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Expires: 2003-11-23
Abstract
Abstract Fiber-reinforced poly(ethylene terephthalate) sheet is laminated to a sheet of amorphous, adhesive copolyester at a temperature at which poly(ethylene terephthalate) is in a molten state. The resulting composite sheet is useful in making thermoformed articles in which one member is bonded to another member, for example, a face member and a backing member. The different members are arranged so that their copolyester layers face each other. Hollowthermoformed articles bonded with amorphous copolyester adhesive exhibit very good bond strength and minimum distortion.
Inventors
- 👤 Edward Hatchadoorian
- 👤 George Joseph Ostapchenko
- 👤 Harlan Stuart Young
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:47
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/36; B29; B29C; B29C51/00; B29C51/14; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/086; B32B27/06; B32B27/08; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B7/00; B32B7/04; B32B7/12; B29K; B29K2067/00; B29K2309/00; B29K2309/08; B32B2262/00; B32B2262/10; B32B2262/101; B32B2305/00; B32B2305/08; B32B2307/00; B32B2307/70; B32B2307/702; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/25; Y10T428/252; Y10T428/26; Y10T428/261; Y10T428/28; Y10T428/2852; Y10T442/00; Y10T442/60; Y10T442/697
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
60 words
A thermoformable composite sheet having a base layer of fiber-reinforced amorphous poly(ethylene terephthalate) in which the fiber distribution is balanced side to side and a layer of an amorphous thermoplastic, adhesive copolyester material firmly attached to one side of said base layer, the thickness of said adhesive layer being at most about 35% of the thickness of said composite sheet.
Claim 2
Dependent Claim
60 words
A thermoformable composite sheet having a base layer of fiber-reinforced amorphous poly(ethylene terephthalate) in which the fiber distribution is balanced side to side and a layer of an amorphous thermoplastic, adhesive copolyester material firmly attached to one side of said base layer, the thickness of said adhesive layer being at most about 35% of the thickness of said composite sheet.
Claim 3
Dependent Claim
14 words
A sheet of Claim 1 wherein the base layer is reinforced with glass fibers.
Claim 4
Dependent Claim
18 words
A sheet of Claim 1 or 2 wherein the average length-to-diameter ratio of the fibers is about 10-35.
Claim 5
Dependent Claim
17 words
any of to 3 4. A sheet of/Claims 1/wherein the average fiber diameter is about 3-30 m.
Claim 6
Dependent Claim
27 words
any preceding 5. A sheet of any precenting Claim wherein the weight of the fibers is about 5-50% of the weight of the fiber-reinforced poly(ethylene terephthalate) layer.
Claim 7
Dependent Claim
23 words
A sheet of Claim 5 wherein the weight of the fibers is about 10-35% of the weight of the fiber-reinforced poly(ethylene terephthalate) layer.
Claim 8
Dependent Claim
100 words
any preceding 7. A sheet of / Claim wherein the fiber-reinforced poly(ethylene terephthalate) layer also contains about 1-20% of the weight of the total composition of a dipolymer of ethylene with an ethylenically unsaturated carboxylic acid or a terpolymer of ethylene with an unsaturated carboxylic acid and with an ester of an ethylenically unsaturated carboxylic acid or with a vinyl ester; with the proviso that the proportion of the carboxylic acid in the dipolymer is about 2-20 weight percent, and the respective proportions of the carboxylic acid and of the ester in the terpolymer are about 1-30 weight percent each.
Claim 9
Dependent Claim
31 words
any preceding f 8. A sheet of/Claim wherein the thickness of the fiber-reinforced poly(ethylene terephthalate) layer is about 0.76-3.2 mm, and the thickness of the adhesive material is about 0.05-0.25 mm.
Claim 10
Dependent Claim
74 words
any preceding 9. A composite sheet of/Claim wherein the copolyester is a polymeric product of at least three monomers, at least one of which is terephthalic acid and at least one of which is ethylene glycol, while the remaining monomers are other dicarboxylic acids or other diols; said copolyester having a glass transition temperature below about 99°C and being able to withstand a short exposure to a temperature of about 260-270°C without significant degradation.
Claim 11
Dependent Claim
20 words
A composite sheet of any preceding Claim wherein the copolyester is a terpolymer of terephthalic acid, ethylene glycol, and 1,4-cyclohexanedimethanol.
Claim 12
Dependent Claim
49 words
A process for making a composite sheet any preceding of/Claim wherein a sheet of amorphous copolyester is contacted with a sheet of fiber-reinforced poly(ethylene terephthalate) at a temperature at which poly(ethylene terephthalate) is in a molten state, and the resulting laminate is quenched to prevent crystallization of poly(ethylene terephthlate)
Claim 13
Dependent Claim
28 words
The process of Claim 11, which is operated in a continuous manner using a three-roll finisher, the composite sheet passing through the gap between two of the rolls.
Claim 14
Dependent Claim
28 words
The process of Claim 12 wherein the fiber-reinforced poly(ethylene terephthalate) sheet is fed to the finisher directly from the die of an extruder in which it is formed.
Claim 15
Dependent Claim
17 words
The process of Claim 13 wherein the temperature of the sheet exiting the die is about 265°C.
Claim 16
Dependent Claim
63 words
In a process for thermoforming in a single mold a hollow article having a face member and a backing member bonded to the backside of the face member, the improvement of thermoforming each member from a composite sheet of any of Claims 1 to 10 the sheets being placed in the mold so that the adhesive layers on both sheets face each other.
Claim 17
Dependent Claim
21 words
The improvement of Claim 15 wherein the base layer of the composite sheets is reinforced with glass fibers. Claim 15 or
Claim 18
Dependent Claim
44 words
The improvement of Claim 15 or Claim 16 wherein the adhesive layer on the back of the sheet from which the face member is formed is thinner than the adhesive layer on the front of the sheet from which the backing member is made.
References Cited (Backward Citations)
No citation records indexed.
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