US4540623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coextruded multi-layered articles
Assignee: 3M Innovative Properties Co
•
Filing: 1985-01-29
•
Granted: 1985-09-10
•
Expires: 2005-01-29
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
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:43
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
137 words
An impact resistant laminated article in the form of an extruded sheet having a thickness of greater than 10 mils and having a multi-layered structure comprising, on the average, alternating layers of coextruded polymeric, thermoplastic materials wherein the number of layers is greater than or equal to about 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 about 35 to about 90 percent by volume of said layers containing carbonate polymer.
Claim 2
Dependent Claim
137 words
An impact resistant laminated article in the form of an extruded sheet having a thickness of greater than 10 mils and having a multi-layered structure comprising, on the average, alternating layers of coextruded polymeric, thermoplastic materials wherein the number of layers is greater than or equal to about 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 about 35 to about 90 percent by volume of said layers containing carbonate polymer.
Claim 3
Dependent Claim
22 words
A laminated article of claim 1 wherein the thickness of said sheet is from greater than 0.25 mm to about 2.5 cm.
Claim 4
Dependent Claim
20 words
A laminated article of claim 1 wherein the number of said alternating layers ranges from about 40 to about 1500.
Claim 5
Dependent Claim
11 words
A laminated article of claim 1 wherein said article is transparent.
Claim 6
Dependent Claim
21 words
A laminated article of claim 1 wherein the thickness of said sheet is from about 0.76 mm to about 1.3 cm.
Claim 7
Dependent Claim
20 words
A laminated article of claim 1 wherein said article has applied to the major surfaces thereof, a polyolefinic sacrificial skin.
Claim 8
Dependent Claim
18 words
A laminated article of claim 1 wherein the outermost layers of said multi-layered structure comprise a carbonate polymer.
Claim 9
Dependent Claim
15 words
A laminated article of claim 1 wherein said carbonate polymer is a homopolymer of bisphenol-A.
Claim 10
Dependent Claim
32 words
A 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 of another thermoplastic material.
Claim 11
Dependent Claim
34 words
A laminate article of claim 1 where additives selected from the group consisting of stabilizers, lubricants, plasticizers, anti-oxidants, fire retardants, fillers, reinforcing fibers and pigments are incorporated into said article through said thermoplastic materials.
Claim 12
Dependent Claim
18 words
A laminated article of claim 1 wherein said layers containing a carbonate polymer consist essentially of carbonate polymer.
Claim 13
Dependent Claim
26 words
A laminated article of claim 1 wherein said article is comprised of from about 40 to about 80 percent by volume of layers containing carbonate polymer.
Claim 14
Dependent Claim
24 words
A laminated article of claim 1 having a thickness of greater than 10 mils and having a suitable thickness for application in glazing applications.
Claim 15
Dependent Claim
32 words
A laminated article of claim 1 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 16
Dependent Claim
17 words
A laminated article of claim 14 wherein one of said polymeric, thermoplastic materials is a styrene/acrylonitrile copolymer.
Claim 17
Dependent Claim
18 words
A laminated article of claim 14 wherein one of said polymeric, thermoplastic materials is a styrene/acrylic acid copolymer.
Claim 18
Dependent Claim
15 words
A laminated article of claim 14 wherein one of said polymeric, thermoplastic materials is polymethylmethacrylate.
Claim 19
Dependent Claim
18 words
A laminated article of claim 14 wherein one of said polymeric, thermoplastic materials is a rubber-modified styrene/acrylonitrile copolymer.
Claim 20
Dependent Claim
21 words
A laminated article of claim 1 wherein said article has applied therein and to the major surfaces thereof, an integral skin.
Claim 21
Dependent Claim
16 words
A laminated article of claim 19 wherein an ultra-violet stabilizer is incorporated into said integral skin.
Claim 22
Dependent Claim
32 words
A 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 23
Dependent Claim
19 words
A laminated article of claim 21 wherein said other thermoplastic material is a copolymer of styrene/acrylonitrile or styrene/acrylic acid.
Claim 24
Dependent Claim
24 words
A laminated article of claim 21 wherein the refractive indices of said polymeric, thermoplastic materials are essentially equal to that of said carbonate polymer.
Claim 25
Dependent Claim
11 words
A laminated article of claim 21 wherein said article is transparent.
References Cited (Backward Citations)
US3557265A
Cited
US3565985A
Cited
US3576707A
Cited
US3759647A
Cited
US3647612A
Cited
US3801429A
Cited
US3773882A
Cited
US3884606A
Cited
US4261473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |