Patent EP0371470A2 successfully refreshed from Google Patents.
EP0371470A2
Expired / Lapsed
EP
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Method for recording and erasing a visible image on a card
Assignee: Mitsubishi Chemical Corp
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Filing: 1989-11-29
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Granted: —
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Expires: 2009-11-29
Abstract
Abstract A method for recording and erasing a visible image on a card having a recording area with a smooth surface of a synthetic resin, which comprises a step of subjecting the smooth surface in the recording area to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of the synthetic resin, to form a frosted surface having a strain, and a step of defrosting the frosted surface by heating it at a temperature higher than the temperature for the frosting treatment, to return it to a smooth surface, whereby a visible image is formed in the recording area by the contrast between the frosted surface and the smooth surface.
Inventors
- 👤 Masami Mitsubishi Plastics Ind. Ltd. Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:38
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/30; B42D25/351; B42D25/40; B42D25/405; B42D25/20; B42D25/26; B42D25/45; B42D2033/10; B42D2033/30; B42D2035/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A method for recording and erasing a visible image on a card having a recording area with a smooth surface of a synthetic resin, which comprises a step of subjecting the smooth surface in the recording area to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of said synthetic resin, to form a frosted surface having a strain, and a step of defrosting the frosted surface by heating it at a temperature higher than the temperature for the frosting treatment, to return it to a smooth surface, whereby a visible image is formed in the recording area by the contrast between the frosted surface and the smooth surface.
Claim 2
Independent Claim
118 words
A method for recording and erasing a visible image on a card having a recording area with a smooth surface of a synthetic resin, which comprises a step of subjecting the smooth surface in the recording area to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of said synthetic resin, to form a frosted surface having a strain, and a step of defrosting the frosted surface by heating it at a temperature higher than the temperature for the frosting treatment, to return it to a smooth surface, whereby a visible image is formed in the recording area by the contrast between the frosted surface and the smooth surface.
Claim 3
Independent Claim
90 words
A method for recording and erasing a visible image on a card having a recording area with a smooth surface of a synthetic resin, which comprises, for recording, subjecting the smooth surface partially to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of said synthetic resin, to form a frosted image in the recording area, and, for erasing, heating the frosted image at a temperature higher than the temperature for the frosting treatment to defrost and erase the frosted image.
Claim 4
Independent Claim
90 words
A method for recording and erasing a visible image on a card having a recording area with a smooth surface of a synthetic resin, which comprises, for recording, subjecting the smooth surface partially to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of said synthetic resin, to form a frosted image in the recording area, and, for erasing, heating the frosted image at a temperature higher than the temperature for the frosting treatment to defrost and erase the frosted image.
Claim 5
Dependent Claim
29 words
The method according to Claim 2, wherein a metallic specular layer is disposed beneath the synthetic resin to enhance the contrast between the smooth surface and the frosted image.
Claim 6
Dependent Claim
25 words
The method according to Claim 3, wherein the metallic specular layer has a 60° specular glossiness of at least 100% as stipulated by JIS Z-8741.
Claim 7
Independent Claim
130 words
A method for recording and erasing a visible image on a card having a recording area with a smooth surface of a synthetic resin, which comprises preliminarily subjecting the recording area to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of the synthetic resin to form a frosted surface having a strain over the entire recording area; for recording, heating the recording area partially at a temperature higher than the temperature for the frosting treatment to form a defrosted image of smooth surface; and, for erasing, subjecting the recording area to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of said synthetic resin to frost and erase the defrosted image.
Claim 8
Independent Claim
130 words
A method for recording and erasing a visible image on a card having a recording area with a smooth surface of a synthetic resin, which comprises preliminarily subjecting the recording area to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of the synthetic resin to form a frosted surface having a strain over the entire recording area; for recording, heating the recording area partially at a temperature higher than the temperature for the frosting treatment to form a defrosted image of smooth surface; and, for erasing, subjecting the recording area to frosting treatment at a temperature within a range of from the glass transition temperature to the melting point of said synthetic resin to frost and erase the defrosted image.
Claim 9
Dependent Claim
29 words
The method according to Claim 5, wherein a metallic specular layer is disposed beneath the synthetic resin to enhance the contrast between the defrosted image and the frosted surface.
Claim 10
Dependent Claim
25 words
The method according to Claim 6, wherein the metallic specular layer has a 60° specular glossiness of at least 100% as stipulated by JIS Z-8741.
References Cited (Backward Citations)
No citation records indexed.
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