| 主权项 |
1. A polymer interlayer, comprising:
a first polymer sheet comprising poly(vinyl butyral) and a plasticizer; and a second polymer sheet adjacent to said first polymer sheet, wherein said second polymer sheet comprises poly(vinyl butyral) and a plasticizer; wherein at least one of said first polymer sheet and said second polymer sheet is an embossed polymer sheet comprising a first embossed surface having an Rz value of at least 20 micrometers, a waviness index of less than 20,000 square micrometers, and a permanence of less than 85 percent wherein said embossed polymer sheet comprising said first embossed surface is prepared by a method comprising the steps of: forming a polymer layer comprising poly(vinyl butyral) and a plasticizer; wherein said polymer layer has a first surface and a second surface, wherein said first surface has a waviness index of less than 20,000 square micrometers and an Rz value of less than 20 micrometers, and embossing said polymer layer on said first surface with a roughness pattern to produce said embossed surface, wherein said embossed surface has a waviness index of less than 20,000 square micrometers, an Rz value of at least 20 micrometers, and a permanence of less than 85 percent. |
