Patent ID: 6177032
Filing Date: 2001-01-23
Classification: B29D

Abstract:
A method for producing a light polarizing sub-laminating comprising:(a) providing a sheet which comprises in order:(i) a light polarizing layer comprising a stretched polyvinyl alcohol film containing a polarizing dye,(ii) an isotropic support layer for the light polarizing layer, and(iii) a protective removable skin;(b) treating the light polarizing layer with a siloxane coupling agent;(c) laminating a polyurethane layer to the treated light polarizing layer;(d) forming at least one curved cavity in the sheet by supporting the sheet on a plate having at least one opening, heating the sheet, and applying a vacuum to the protective removable skin to pull a portion of the sheet into the at least one opening to form the at least one curved cavity; ande) removing the protective removable skin to form the light polarizing sub-laminate.