US4301212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scratch-resistant and weather-resistant laminates based on polycarbonate
Assignee: Bayer AG
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Filing: 1978-06-02
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Granted: 1981-11-17
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Expires: 1998-06-02
Abstract
Abstract The present invention relates to a clear and transparent, scratch-resistant and weather-resistant laminate of high impact strength, consisting of a polycarbonate layer which, on at least one of its surfaces, carries a polyacrylate coating which, on its outer surface, is coated with a scratch-resistant and weather-resistant covering of a hydroxylated fluoropolymer which is cross-linked with methylmelamine and/or polysilicic acid. The present invention also relates to a process for the production of said scratch-resistant laminate.
Inventors
- 👤 Wolfgang Cohnen
- 👤 Frank Kleiner
- 👤 Gerhard Kranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:44
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/043; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/308; B32B27/36; B32B27/365; C08J7/042; C08J7/046; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/558; B32B2307/584; B32B2307/70; B32B2307/712; C08J2369/00; C08J2427/00; C08J2427/02; C08J2427/12; C08J2433/00; C08J2433/04; C08J2433/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/3154
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
37 words
A laminate comprising a polycarbonate layer which carries, on at least one of its surfaces, an uncrosslinked polyacrylate layer having a coating of a hydroxylated fluoropolymer crosslinked with methylmelamine, polysilicic acid or both on its outer surface.
Claim 2
Dependent Claim
37 words
A laminate comprising a polycarbonate layer which carries, on at least one of its surfaces, an uncrosslinked polyacrylate layer having a coating of a hydroxylated fluoropolymer crosslinked with methylmelamine, polysilicic acid or both on its outer surface.
Claim 3
Dependent Claim
16 words
The laminate according to claim 1, wherein the fluoropolymer is a hydroxylated fluoropolymer crosslinked with methylmelamine.
Claim 4
Dependent Claim
128 words
The laminate according to claim 2, wherein the hydroxylated fluoropolymer, crosslinked with methylmelamine, is comprised of fluorine-containing polymer chains crosslinked by oxygen-methylmelamine bonds whereby (i) the oxygen is bonded to a carbon atom in the skeleton of the polymer chains or to a side chain, (ii) said carbon atom carries at least one hydrogen atom, (iii) at least about 20% by weight of fluorine is present in the skeleton of the polymer chain, (iv) each polymer chain has a unit weight of not more than about 700 per oxygen atom in the crosslinked oxygen-methylmelamine bond, and (v) the methylmelamine of the oxygen-methylmelamine bond had the following formula ##STR2## wherein at least two of the CH 2 groups are bonded to the oxygen atom in the crosslinked oxygen-methylmelamine bond.
Claim 5
Dependent Claim
36 words
The laminate according to claim 3, wherein the fluorine containing polymer chains are comprised of fluorine-containing monomer units and optionally co-polymerized fluorine-free, ethylenically unsaturated monomer units, characterized in that the units contain oxygen bonded to methylmelamine.
Claim 6
Dependent Claim
19 words
The laminate according to claim 4, wherein the ethylenically unsaturated monomer units are derived from a hydroxyalkyl vinyl ether.
Claim 7
Dependent Claim
17 words
The laminate according to claim 1, wherein the fluoropolymer is a hydroxylated fluoropolymer crosslinked with polysilicic acid.
Claim 8
Dependent Claim
19 words
The laminate according to claim 1, wherein the fluoropolymer is a hydroxylated fluoropolymer crosslinked with methylmelamine and polysilicic acid.
Claim 9
Dependent Claim
34 words
The laminate according to either claim 6 or 7, wherein the fluoropolymer has a SiO 2 content of up to about 60% by weight, relative to the total weight of fluoropolymer and crosslinking agent.
Claim 10
Dependent Claim
14 words
The laminate according to claim 1, wherein the polyacrylate layer consists of polymethyl methacrylate.
Claim 11
Dependent Claim
15 words
The laminate according to claim 1, wherein the polycarbonate layer is coated on both sides.
Claim 12
Dependent Claim
21 words
The laminate according to claim 1, wherein the polyacrylate layer has a thickness of from about 0.010 to about 1.25 mm.
Claim 13
Dependent Claim
23 words
The laminate according to claim 1, wherein the coating of crosslinked fluoropolymer has a thickness of from about 0.005 to about 0.05 mm.
Claim 14
Dependent Claim
22 words
The laminate according to claim 1, wherein the polycarbonate has a mean weight-average molecular weight Mw between about 10,000 and about 100,000.
Claim 15
Dependent Claim
38 words
A process for the production of a laminate comprising applying an uncrosslinked polyacrylate coating to a polycarbonate substrate and covering the polyacrylate layer with a hydroxylated fluoropolymer coating which is then crosslinked with methylmelamine, polysilicic acid or both.
Claim 16
Dependent Claim
38 words
A process for the production of a laminate comprising applying an uncrosslinked polyacrylate coating to a polycarbonate substrate and covering the polyacrylate layer with a hydroxylated fluoropolymer coating which is then crosslinked with methylmelamine, polysilicic acid or both.
Claim 17
Dependent Claim
41 words
A process for the production of a laminate comprising applying an uncrosslinked polyacrylate film to a polycarbonate substrate and covering the polyacrylate film with a hydroxylated fluoropolymer coating which is then crosslinked with at least one of methylmelamine and polysilicic acid.
Claim 18
Dependent Claim
41 words
A process for the production of a laminate comprising applying an uncrosslinked polyacrylate film to a polycarbonate substrate and covering the polyacrylate film with a hydroxylated fluoropolymer coating which is then crosslinked with at least one of methylmelamine and polysilicic acid.
Claim 19
Dependent Claim
20 words
The process of either claim 14 or 15, wherein the polyacrylate is applied to both sides of the polycarbonate substrate.
Claim 20
Dependent Claim
38 words
A process for the production of a laminate comprising applying an uncrosslinked polyacrylate film, coated with a hydroxylated fluoropolymer crosslinked with methylmelamine, to a polycarbonate substrate, so that the fluoropolymer coating forms the outer surface of the laminate.
Claim 21
Dependent Claim
38 words
A process for the production of a laminate comprising applying an uncrosslinked polyacrylate film, coated with a hydroxylated fluoropolymer crosslinked with methylmelamine, to a polycarbonate substrate, so that the fluoropolymer coating forms the outer surface of the laminate.
Claim 22
Dependent Claim
38 words
The process of either claim 15 or 17, wherein the polyacrylate film is applied to the polycarbonate substrate at a temperature of at least about 160° C. and a pressure of at least about 1.4 kg/cm 2 .
Claim 23
Dependent Claim
13 words
A laminate prepared by the process of either claims 14, 15, or 17.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |