Multiple layer polymer interlayers having an embossed surface

Details Multiple layer polymer interlayers having an embossed surface Multiple layer polymer interlayers having an embossed surface

B - Operations, Transporting

32

B

B32B 17/10 (2006.01) B29C 59/02 (2006.01) C03C 27/12 (2006.01)

Patent

CA 2682529

The present invention provides multiple layer interlayers having a relatively soft inner layer and relatively stiff outer layers that can be laminated without unacceptable optical distortion and used in various multiple layer glass panel type applications. Multiple layer interlayers of the present invention have surface topography that is formed by embossing the exposed surface of the interlayer, or individual layers of the multiple layer interlayer, after formation of the interlayer or layers. The embossing process is carried out under temperature conditions that prevent the transfer of the embossing to inner layers of the interlayer. By precisely controlling the embossing of the interlayer, lamination of the interlayer with a rigid substrate does not lead to unacceptable optical distortion caused by the transfer of the surface topography through outer, stiffer layers into softer, internal layers of the interlayer.

L'invention concerne des couches intermédiaires multicouches comprenant une couche interne relativement souple et des couches externes relativement rigides pouvant être stratifiées sans distorsion optique inacceptable et utilisées dans diverses applications de type panneau de verre multicouche. Les couches intermédiaires selon l'invention présentent une topographie de surface formée par gaufrage de la surface exposée de la couche intermédiaire ou de couches individuelles de la couche intermédiaire multicouche, après formation de la couche intermédiaire ou des couches individuelles. Le processus de gaufrage est réalisé dans des conditions de température qui empêchent le transfert du gaufrage aux couches internes de la couche intermédiaire. Grâce à la régulation précise du gaufrage de la couche intermédiaire, la stratification de la couche intermédiaire avec un substrat rigide n'entraîne pas de distorsion optique inacceptable causée par le transfert de la topographie de surface à travers les couches externes plus rigides aux couches internes plus souples de la couche intermédiaire.

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