EP0177034A2
Expired / Lapsed
EP
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Plastic parts with surface-hardening coating containing ultraviolet absorber
Assignee: Nissan Motor Co Ltd
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Filing: 1985-10-02
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Granted: —
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Expires: 2005-10-02
Abstract
Abstract Disclosed is an improved surface-hardening coating on a plastic body such as a plastic lens. The surface-hardening coating consists of a hard-coat layer of a polymer base composition and an underlying primer layer, which contains an ultraviolet absorber low in the bleeding tendency amounting to 0.5-50 wt% of the plastic component of the primer. A triazole having a vapor pressure not higher than 1 x 10 5 KPa at 100°C is preferred as the ultraviolet absorber. The introduction of such an ultraviolet absorber into the primer layer has the effect of greatly enhancing the durability and weatherability of the coating without sacrificing the surface hardness.
Inventors
- 👤 Yasuo Tateoka
- 👤 Ryuzo Uemura
- 👤 Takatoshi Sagawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 13:47
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00865; F; F21; F21S; F21S41/00; F21S41/20; F21S41/28; F21S45/00; F21S45/10; F21V; F21V3/00; F21V3/04; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31855; Y10T428/31859; Y10T428/31862; Y10T428/31942
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
73 words
A plastic part comprising: a plastic body; and a surface-hardening coating film which is formed on a surface of said plastic body and comprises a plastic primer layer laid directly on said surface and a hard-coat layer of a polymer base composition laid on said primer layer, said primer layer containing an ultraviolet absorber which is low in the bleeding tendency and amounts to 0.5-50 wt% of the plastic component of the primer.
Claim 2
Dependent Claim
73 words
A plastic part comprising: a plastic body; and a surface-hardening coating film which is formed on a surface of said plastic body and comprises a plastic primer layer laid directly on said surface and a hard-coat layer of a polymer base composition laid on said primer layer, said primer layer containing an ultraviolet absorber which is low in the bleeding tendency and amounts to 0.5-50 wt% of the plastic component of the primer.
Claim 3
Dependent Claim
29 words
A plastic part according to Claim 1, wherein said ultraviolet absorber is an organic compound having a vapor pressure not higher than 1 x 10 -5 KPa at 100°C.
Claim 4
Dependent Claim
14 words
A plastic part according to Claim 2, wherein said organic compound is a triazole.
Claim 5
Dependent Claim
24 words
4 . A plastic part according to Claim 3, wherein said triazole is selected from the group consisting of 2-(2'-hydroxy-3'-t-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-t-amylphenyl)benzotriazole and 2-[2-hydroxy-3,5- bis(α,α-dimethylbenzyl)phenyl]benzotriazole.
Claim 6
Dependent Claim
16 words
5 . A plastic part according to Claim 2, wherein said organic compound is a thiazole.
Claim 7
Dependent Claim
12 words
A plastic part according to Claim 5, wherein said thiazole is 2-(2'-hydroxy-3',5'-di-t-butyl)benzothiazole.
Claim 8
Dependent Claim
18 words
A plastic part according to Claim 1. wherein said plastic component of the primer is an acrylic resin.
Claim 9
Dependent Claim
17 words
A plastic part according Claim 1, wherein said plastic component of the primer is a silicone resin.
Claim 10
Dependent Claim
18 words
A plastic part according to Claim 1. wherein said plastic component of the primer is a polyurethane resin.
Claim 11
Dependent Claim
18 words
A plastic part according to Claim 1, wherein said hard-coat layer is formed of a silicone base composition.
Claim 12
Dependent Claim
19 words
A plastic part according to Claim 1, wherein said hard-coat layer is formed of a melamine resin base composition.
Claim 13
Dependent Claim
19 words
A plastic part according to Claim 1, wherein said hard-coat layer is formed of an acrylic resin base composition.
Claim 14
Dependent Claim
15 words
A plastic part according to Claim 1. wherein said plastic body is a transparent body.
Claim 15
Dependent Claim
81 words
A plastic lens for an automobile headlamp unit, comprising: a transparent plastic lens body: and a surface-hardening coating film which is formed on an outer surface of said lens body and comprises a plastic primer layer laid directly on said surface and a hard-coat layer of a polymer base composition laid on said primer layer, said primer layer containing an ultraviolet absorber which is low in the bleeding tendency and amounts to 0.5-50 wt% of the plastic component of the primer.
Claim 16
Dependent Claim
81 words
A plastic lens for an automobile headlamp unit, comprising: a transparent plastic lens body: and a surface-hardening coating film which is formed on an outer surface of said lens body and comprises a plastic primer layer laid directly on said surface and a hard-coat layer of a polymer base composition laid on said primer layer, said primer layer containing an ultraviolet absorber which is low in the bleeding tendency and amounts to 0.5-50 wt% of the plastic component of the primer.
Claim 17
Dependent Claim
31 words
1 5. A plastic lens according to Claim 14, wherein said ultraviolet absorber is an organic compound having a vapor pressure not higher than 1 x 10 -5 KPa at 100°C.
Claim 18
Dependent Claim
16 words
1 6. A plastic lens according to Claim 15, wherein said organic compound is a triazole.
References Cited (Backward Citations)
No citation records indexed.
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