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US 2014/0150691 A1Published application
Sulfite softwood based cellulose triacetate for lcd films
AssigneeEastman Chemical Company
InventorsDarryl Aubrey Godfrey, Laurel Leigh Reitfort
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Abstract
The invention provides a way of using cellulose triacetate (CTA) made from softwood pulp to make films suitable for use in liquid crystal displays (LCDs). It has been surprisingly found that a combination of certain additives in the film casting dope and of metal and sulfur content of the CTA allow a softwood CTA to exhibit peeling characteristics from the casting substrate that are similar to those of lint-based CTA of similar sulfur content. The additives include a combination of acid scavengers and chelating agents.
Claims26
A dope for making a solvent-cast film comprising:
- (a) cellulose triacetate made from sulfite-process softwood pulp and having less than 35 ppm of sulfur and less than 2 weight percent of xylose, both based on the weight of the cellulose triacetate, and a molar ratio of metals to sulfate of at least 3:1;
- (b) an acid scavenger;
- (c) a chelating agent;
- and
- (d) a solvent.
2 more elements
A film comprising:
- (a) cellulose triacetate made from sulfite-process softwood pulp and having less than 35 ppm of sulfur and less than 2 weight percent of xylose, both based on the weight of the cellulose triacetate, and a molar ratio of metals to sulfate of at least 3:1;
- (b) an acid scavenger;
- and
- (c) a chelating agent.
1 more element
Dependencies are inferred from the claim text.