Composite glazing having films containing softening agents having low tendency to creep
AssigneeKuraray Europe GmbH
InventorsUwe Keller, Martin Steuer
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Abstract
Composite glass laminates having low tendency to creep contain a softening agent-containing polyvinyl acetal film wherein the polyvinyl acetal has a polyvinyl alcohol content of 12 to 16 weight percent, a molecular weight greater than 110,000 g/mol, and a solution viscosity of more than 80 mPas.
Claims11
A composite glass laminate comprising a layered assembly formed of at least two glass panes having at least one interposed film formed of polyvinyl acetal containing softening agent(s) between the panes, wherein the film contains polyvinyl acetal(s) having a polyvinyl alcohol fraction of 12 to 16% by weight and has a tendency to creep, determined on a laminate having a structure formed of 3 mm float glass/0.76 mm film/3 mm float glass, of less than 5 mm at a temperature of 100° C. after 7 days, the polyvinyl acetal having a weight average molecular weight Mw of more than 110,000 g/mol and a solution viscosity of more than 80 mPas.
Dependencies are inferred from the claim text.