Composite interlayer for laminated glass
AssigneeSolutia Inc.
InventorsJames R. Moran, Francis G. Gerberich
Life of this patent
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Abstract
A composite interlayer suitable for using laminated glass includes a layer of plasticized polyvinyl butyral sandwiched between second and third polymeric layers. In a preferred embodiment, at least one and preferably both of the second and third layers are less than 5 mils thick and formed of polyurethane.
Claims19
A multilayer composite comprising:
- a first layer comprising a plasticized polyvinyl butyral and having a top surface and a bottom surface;
- a second layer adjacent said top surface of said first layer;
- and
- a third layer adjacent said bottom surface of said first layer;
- wherein at least one of said second and third layers comprises plasticized polyurethane having a thickness of less than 5 mils.
A multilayer composite comprising:
- a first layer formed from a plasticized polyvinyl butyral;
- and
- a second layer adjacent to said first layer comprising a plasticized polyurethane wherein plasticizer is added to the polyurethane prior to forming the composite.
A multilayer composite comprising:
- a first layer comprising polyvinyl butyral;
- and
- a second layer, having a thickness less than 5 mils, of a plasticized polyurethane, said second layer being attached to a first side of the first layer.
A process for forming a multilayer composite, said process comprising:
- forming a first layer comprising a plasticized polyvinyl butyral and a second layer adjacent to said first layer comprising a plasticized polyurethane;
- and
- transferring plasticizer between layers during or after the forming step.
A process for forming a multilayer composite suitable for use in glass laminates, said process comprising:
- coextruding a first layer comprising a plasticized polyvinyl butyral and a second layer adjacent to said first layer comprising polyurethane under conditions wherein plasticizer can migrate from said polyvinyl butyral to said polyurethane.
A process for forming a multilayer composite, said process comprising:
- forming a first layer comprising a plasticized polyvinyl butyral and a second layer adjacent to said first layer comprising a plasticized polyurethane having a thickness less than 5 mils.
Dependencies are inferred from the claim text.