Lid for a Container and a Process for Making the Same
First Claim
1. A lid for a container, the lid comprising a first plastic layer and a second plastic layer disposed on top of the first layer, the first layer including at least one portion comprising at least one coloured pigment, the second layer including at least one portion comprising at least one thermochromic substance which is capable of becoming substantially translucent upon reaching a predetermined temperature in response to heat transfer from or to contents of the container so as to reveal at least one of the portions comprising the coloured pigment of the first layer.
1 Assignment
0 Petitions
Accused Products
Abstract
A lid (2) for a container (67), the lid (2) comprising a first plastic layer (15) including a portion having at least one colored pigment and a second plastic layer (14) including at least one thermochromic substance capable of becoming translucent upon reaching a predetermined temperature in response to heat transfer from or to contents of the container so as to reveal the colored pigment of the first layer. Alternatively, there is described a lid comprising a layer with a portion (62,63) that becomes either observable or non-observable at the predetermined temperature.
115 Citations
28 Claims
- 1. A lid for a container, the lid comprising a first plastic layer and a second plastic layer disposed on top of the first layer, the first layer including at least one portion comprising at least one coloured pigment, the second layer including at least one portion comprising at least one thermochromic substance which is capable of becoming substantially translucent upon reaching a predetermined temperature in response to heat transfer from or to contents of the container so as to reveal at least one of the portions comprising the coloured pigment of the first layer.
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2. A lid for a container, the lid comprising a first HIPS layer and a second HIPS layer disposed on top of the first layer, the first layer comprising at least one portion having at least one coloured pigment, the second layer including at least one portion having at least one thermochromic substance in an amount up to 12 wt % of the layer and having a reduced particle size, which thermochromic substance is capable of becoming substantially translucent upon reaching a predetermined temperature in response to heat transfer from or to contents of the container so as to reveal at least one of the portions comprising the coloured pigment of the first layer, the second layer having a thickness substantially less than the thickness of the first layer.
- 23. A lid for a container, the lid comprising a layer comprising at least one portion having at least one thermochromic substance which is adapted to change colour and/or become substantially translucent upon reaching a predetermined temperature(s) in response to heat transfer from or to contents of the container, the layer being provided in at least one portion with at least one coloured pigment, which portion is observable at said predetermined temperature(s) and non-observable at a temperature other than the predetermined temperature(s), the colour of said pigment being the same or substantially the same colour as that of said thermochromic substance at a temperature other than the predetermined temperature(s) or which portion becomes non-observable at said predetermined temperature(s) and observable at a temperature other than the predetermined temperature(s), the colour of said pigment being the same or substantially the same colour as that of said thermochromic substance at the predetermined temperature(s).
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25. (canceled)
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26. A process for preparing a lid for a container comprising:
co-extruding a first plastic layer and a second plastic layer, and optionally one or more additional plastic layers, the first layer comprising in at least one portion at least one coloured pigment, the second layer comprising at least one portion comprising at least one thermochromic substance which is adapted to become substantially translucent upon reaching a predetermined temperature in response to heat transfer from or to contents of the container to reveal at least one of the portions having the coloured pigment of the first layer.
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28. A lid for a container, the lid comprising a first plastic layer and a second plastic layer disposed on top of the first layer and optionally one or more additional plastic layers, the first layer including at least one portion comprising at least one coloured pigment, the second layer including at least one portion comprising at least one thermochromic substance which is capable of becoming substantially translucent upon reaching a predetermined temperature in response to heat transfer from or to contents of the container so as to reveal at least one of the portions comprising the coloured pigment of the first layer, wherein one or more of the layers of the lid include regrind.
Specification