Highly transmissive ptfe dense film with tunable haze and color
AssigneeW. L. Gore & Associates, Inc.
InventorsMichael B. Minor, Michael E. Kennedy, Shaofeng Ran
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Abstract
Dense polytetrafluoroethylene films as well as methods for preparing the present materials are provided having superior optical properties (highly transmissive, low haze, low yellowness) in combination with desirable mechanical properties (such as flexibility, strength, and durability). The highly transmissive dense films are suitable for use in a variety of optical applications, such as a cover layer for a screen in a portable electronic device.
Claims23
An article comprising:
- a dense polytetrafluoroethylene (PTFE) film having:
- an average haze coefficient of less than about 6% from 360 nm to 780 nm;
- and
- a reduced scattering coefficient less than or equal to 2.9 mm−1 at 400 nm.
(canceled)
(canceled)
A process to form a dense polytetrafluoroethylene film comprising:
- stretching a dried PTFE preform tape comprising modified PTFE resin having a raw dispersion particle size of less than 240 nm, in at least one direction at a temperature at or above PTFE crystalline melting temperature to form a dense polytetrafluoroethylene (PTFE) film having
- (a) an average haze coefficient of less than about 6% from 380 nm to 780 nm;
- and
- (b) a reduced scattering coefficient less than or equal to 2.9 mm-1 at@400 nm.
-19. (canceled)
The process of claim 19, wherein the ethylenically unsaturated monomer is a perfluoroalkylethylene having a formula F(CF2)nCH═CH2 wherein n is 4, 5, 6, 7, 8, 9 or 10.
-22. (canceled)
Dependencies are inferred from the claim text.