Dimensional stabilizing process
First Claim
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1. A method of dimensionally stabilizing a transparent, shrinkable thermoplastic layer in a draw-formed laminate, said thermoplastic layer carrying one or more performance layers or coatings and being bonded in the laminate with layers of plasticized polyvinyl butyral, said process comprising heat setting the thermoplastic layer by heating the laminate while holding the laminate against the surface of a shaping mold.
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Abstract
A method of dimensionally stabilizing a transparent, shrinkable thermoplastic layer, such as polyethylene terephthalate, in a draw-formed laminate with plasticized polyvinyl butyral which comprises heat setting the thermoplastic layer.
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17 Claims
- 1. A method of dimensionally stabilizing a transparent, shrinkable thermoplastic layer in a draw-formed laminate, said thermoplastic layer carrying one or more performance layers or coatings and being bonded in the laminate with layers of plasticized polyvinyl butyral, said process comprising heat setting the thermoplastic layer by heating the laminate while holding the laminate against the surface of a shaping mold.
- 2. A method of dimensionally stabilizing a transparent, shrinkable layer of polyethylene terephthalate having one or more performance layers or coatings on its surface, said layer being bonded in a draw-formed laminate to at least one layer of plasticized polyvinyl butyral, said method comprising the step of subjecting the laminate to elevated temperature by holding the laminate against the surface of a shaping mold for the laminate for a sufficient time to heat set the polyethylene terephthalate layer.
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