Process and apparatus for forming plastic sheet
AssigneeRohm and Haas Company
InventorsSteven David Fields, Garo Khanarian, Jeffrey Lawrence Daecher, Alan Daniel Stein
Life of this patent
Estimating the term…
Abstract
Disclosed is an apparatus for formation of high quality plastic sheet in a continuous fashion. Also disclosed are a variety of optical and electronic display applications for high quality plastic sheet produced in a continuous fashion.
Claims13
A 3-dimensional optical storage medium comprising a high quality plastic sheet having dispersed thereon one or more pigments, dyes or mixtures thereof, wherein the pigments, dyes or mixtures thereof undergo a change in optical properties locally upon exposure to light;
- wherein the optical storage medium is produced by the steps of:
- a) providing molten plastic resin;
- b) directing the molten plastic resin to an overflow die having an inlet and an outlet;
- c) shaping the molten plastic resin into a molten web using said overflow die;
- d) combining the pigment, dye or mixture thereof with the molten plastic resin prior to shaping the molten resin into a web using said overflow die;
- e) guiding said molten web away from said overflow die;
- and
- f) cooling said molten web to form a solid;
- wherein the high quality plastic sheet has a birefringence of less than or equal to 0.0002.
A 3-dimensional optical storage medium comprising a high quality plastic sheet having dispersed thereon one or more pigments, dyes or mixtures thereof, wherein the pigments, dyes or mixtures thereof undergo a change in optical properties locally upon exposure to light;
- wherein the optical storage medium is produced by the steps of:
- a) providing molten plastic resin;
- b) directing the molten plastic resin to an overflow die having an inlet and an outlet;
- c) shaping the molten plastic resin into a molten web using said overflow die;
- d) combining the pigment, dye or mixture thereof with the molten plastic resin prior to shaping the molten resin into a web using said overflow die;
- e) guiding said molten web away from said overflow die;
- and
- f) cooling said molten web to form a solid;
- wherein the high quality plastic sheet has a shrinkage of less than or equal to 0.10%.
A 3-dimensional optical storage medium comprising a high quality plastic sheet having dispersed thereon one or more pigments, dyes or mixtures thereof, wherein the pigments, dyes or mixtures thereof undergo a change in optical properties locally upon exposure to light;
- wherein the optical storage medium is produced by the steps of:
- a) providing molten plastic resin;
- b) directing the molten plastic resin to an overflow die having an inlet and an outlet;
- c) shaping the molten plastic resin into a molten web using said overflow die;
- d) combining the pigment, dye or mixture thereof with the molten plastic resin prior to shaping the molten resin into a web using said overflow die;
- e) guiding said molten web away from said overflow die;
- and
- f) cooling said molten web to form a solid;
- wherein the high quality plastic sheet has a thickness variation of 10% or less over a sample length of 400 mm.
Dependencies are inferred from the claim text.