EP0138194A2
Expired / Lapsed
EP
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Coextruded multi-layered articles
Assignee: 3M Co
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Filing: 1984-10-11
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Granted: —
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Expires: 2004-10-11
Abstract
Abstract Laminated articles in the form of an extruded sheet have a multi-layered structure and comprise, on the average, alternating layers of coextruded polymeric thermoplastic materials, wherein one of said materials comprises a carbonate polymer. The articles exhibit good impact resistance even when scratched or notched, hydrolytic stability and transparency.
Inventors
- 👤 Jang-Hi Im
- 👤 William E. Shrum
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/28; B32B27/06; B32B27/08; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B27/30; B32B27/32; B32B27/36; B32B27/365; B32B2250/00; B32B2250/42; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/584
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
134 words
A impact resistant laminated article in the form of an extruded sheet having a thickness of 0.25 mm or more and having a multilayered structure comprising, on the average, alternating layers of coextruded polymeric, thermoplastic materials wherein the number of layers is greater than or equal to 40, and wherein one of said materials forming said alternating layers contains a carbonate polymer; and the alternating layers containing carbonate polymer are bound in an essentially contiguous relationship to adjacent layers of the other polymeric materials comprising said article, wherein said alternating layers are in the form of thin films each having a relatively sharply defined interface and are generally parallel to the major surface of said article; said article being comprised of from 35 to 90 percent by volume of said layers containing carbonate polymer.
Claim 2
Dependent Claim
134 words
A impact resistant laminated article in the form of an extruded sheet having a thickness of 0.25 mm or more and having a multilayered structure comprising, on the average, alternating layers of coextruded polymeric, thermoplastic materials wherein the number of layers is greater than or equal to 40, and wherein one of said materials forming said alternating layers contains a carbonate polymer; and the alternating layers containing carbonate polymer are bound in an essentially contiguous relationship to adjacent layers of the other polymeric materials comprising said article, wherein said alternating layers are in the form of thin films each having a relatively sharply defined interface and are generally parallel to the major surface of said article; said article being comprised of from 35 to 90 percent by volume of said layers containing carbonate polymer.
Claim 3
Dependent Claim
18 words
The laminated article of Claim 1 wherein the number of said alternating layers ranges from 40 to 1500.
Claim 4
Dependent Claim
13 words
The laminated article of Claim 1 or 2 wherein said article is transparent.
Claim 5
Dependent Claim
22 words
The laminated article of Claim 1, 2 or 3, wherein the thickness of said sheet is from 0.25 mm to 2.5 cm.
Claim 6
Dependent Claim
36 words
The laminated article of any one of the preceeding Claims wherein the multi-layered structure comprises, on the average, alternating layers of two coextruded polymeric, thermoplastic materials wherein one of said polymeric materials is a carbonate polymer.
Claim 7
Dependent Claim
33 words
The laminated article of any one of the preceeding Claims wherein one of said polymeric, thermoplastic materials is selected from a styrene/acrylonitrile copolymer, a styrene/acrylic acid copolymer, polymethylemthacrylate or a rubber-modified styrene/acrylonitrile copolymer.
Claim 8
Dependent Claim
26 words
The-laminated article of any one of the preceeding Claims wherein said article has applied to at least one outer surface thereof, a polyolefinic sacrificial skin layer.
Claim 9
Dependent Claim
26 words
The laminated article of any one of Claims 1 to 6 wherein said article has applied therein and to the major surfaces thereof, an integral skin.
Claim 10
Dependent Claim
16 words
The laminated article of Claim 8, wherein an ultra-violet stabilizer is incorporated into said integral skin.
Claim 11
Dependent Claim
23 words
The laminated article of any one of Claims 1 to 6, wherein the outermost layers of said multi-layered structure comprise a carbonate polymer.
Claim 12
Dependent Claim
19 words
The laminated article of any one of the preceeding Claims wherein said carbonate polymer is a homopolymer of bisphenol-A.
Claim 13
Dependent Claim
37 words
The laminated article of any one of Claims 1 to 9 wherein said layers containing carbonate polymer comprise a major amount of a carbonate polymer and a minor amount of at least one of another thermoplastic material.
Claim 14
Dependent Claim
32 words
The laminated article of Claim 1 wherein said layers containing carbonate polymer comprise a major amount of a carbonate polymer and a minor amount of at least one other polymeric thermoplastic material.
Claim 15
Dependent Claim
19 words
The laminated article of Claim 13 wherein said other thermoplastic material is a copolymer of styrene/acrylonitrile or styrene/acrylic acid.
Claim 16
Dependent Claim
28 words
The laminated article of any one of the preceeding Claims wherein the refractive indices of said polymeric, thermoplastic materials are essentially equal to that of said carbonate polymer.
References Cited (Backward Citations)
No citation records indexed.
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