Low birefringence film
First Claim
Patent Images
1. A coextruded film comprising a transparent polymeric inner core layer of thickness less than 250 μ
- m and two peelable outer polymeric layers wherein the inner layer constitutes a low enough proportion, less than 40%, of the total film thickness and exhibits a low enough melt flow index value to achieve a birefringence of not more than 1×
10−
4 nm/nm.
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Abstract
Disclosed is a coextruded film comprising a transparent polymeric inner core layer of thickness less than 250 μm and two peelable outer polymeric layers wherein the inner layer constitutes a low enough proportion, less than 40%, of the total film thickness and exhibits a low enough melt flow index value to achieve a birefringence of not more than 1×10−4 nm/nm.
9 Citations
36 Claims
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1. A coextruded film comprising a transparent polymeric inner core layer of thickness less than 250 μ
- m and two peelable outer polymeric layers wherein the inner layer constitutes a low enough proportion, less than 40%, of the total film thickness and exhibits a low enough melt flow index value to achieve a birefringence of not more than 1×
10−
4 nm/nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
- m and two peelable outer polymeric layers wherein the inner layer constitutes a low enough proportion, less than 40%, of the total film thickness and exhibits a low enough melt flow index value to achieve a birefringence of not more than 1×
-
25. A process for forming a low birefringence layer comprising coextruding film comprising a transparent polymeric inner layer of thickness less than 250 μ
- m and two peelable outer polymeric layers wherein the inner layer constitutes a low enough % of the total film thickness, less than 40%, and exhibits a low enough melt flow index value to achieve a birefringence of not more than 1×
104 nm/nm. - View Dependent Claims (26, 27, 28, 29, 32, 33, 34, 35, 36)
- m and two peelable outer polymeric layers wherein the inner layer constitutes a low enough % of the total film thickness, less than 40%, and exhibits a low enough melt flow index value to achieve a birefringence of not more than 1×
-
30. A coextruded film comprising a transparent polymeric layer of thickness less than 250 μ
- m and one peelable outer polymeric layer wherein the transparent layer constitutes a low enough proportion, less than 60%, of the total film thickness and exhibits a low enough melt flow index value to achieve a birefringence of not more than 1×
10−
4 nm/nm. - View Dependent Claims (31)
- m and one peelable outer polymeric layer wherein the transparent layer constitutes a low enough proportion, less than 60%, of the total film thickness and exhibits a low enough melt flow index value to achieve a birefringence of not more than 1×
Specification