Composite card
First Claim
Patent Images
1. A multi layered card comprising:
- a layer of polyester terepthalate (PET) material having a first coefficient of expansion as a function of temperature;
a layer of polyvinyl chloride (PVC) material having a second coefficient of expansion as a function of temperature;
where said first and second coefficients of expansion have substantially different values; and
a buffer layer of plastic material attached on one surface to the PET layer and attached on its other surface to the PVC layer, said buffer layer having a coefficient of expansion as a function of temperature whose value is intermediate that of said first and second coefficients of expansion;
whereby the stress between the PET layer and the buffer layer and between the buffer layer and the PVC layer due to temperature are less than the stress that would exist if the PET and PVC layers were in direct contact with each other.
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Abstract
Multi-layered cards embodying the invention include a buffer layer between a PET layer and a PVC layer. The buffer layer is selected to have temperature and stress responsive properties intermediate to those of the PET and PVC layers. The buffer layer is formed of a material which has a low degree of moisture absorbance whereby the surface of the PVC layer is protected from moisture in the atmosphere. The buffer layer is also more elastic than the PVC layer.
79 Citations
17 Claims
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1. A multi layered card comprising:
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a layer of polyester terepthalate (PET) material having a first coefficient of expansion as a function of temperature;
a layer of polyvinyl chloride (PVC) material having a second coefficient of expansion as a function of temperature;
where said first and second coefficients of expansion have substantially different values; and
a buffer layer of plastic material attached on one surface to the PET layer and attached on its other surface to the PVC layer, said buffer layer having a coefficient of expansion as a function of temperature whose value is intermediate that of said first and second coefficients of expansion;
whereby the stress between the PET layer and the buffer layer and between the buffer layer and the PVC layer due to temperature are less than the stress that would exist if the PET and PVC layers were in direct contact with each other.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multi layered card comprising:
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a first core layer made of one of the following materials polyvinyl chloride (PVC), amorphous polyester terepthalate (APET), PETG, compounds of PVC, and polyvinyl chloride acetate (PVCA);
a first buffer layer attached to the top surface of the first core layer;
a second buffer layer attached to the bottom surface of the first core layer;
wherein the buffer layers are made of one of the following materials a copolymer of PVC and polyethelne (PE), a copolymer of PVC and polyvinyl acetate, polyolefins, ethylene, vinyl acetate, amorphous polyesters and acrylics; and
a first strengthening layer attached to the top surface of the first buffer layer and a second strengthening layer attached to the bottom surface of the second buffer layer;
wherein the strengthening layers are formed of one of oriented PET and polycarbonate.- View Dependent Claims (11, 12, 13, 14)
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15. A multi-layered card comprising:
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a first plurality of layers of plastic materials attached to each other to form a first stack which is bowed in one direction; and
at least one additional layer which when attached to said first plurality of layers by a process which includes the imparting of heat to the first plurality of layers and the additional layer causes the combination to be flat. - View Dependent Claims (16, 17)
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Specification