Plasticizers for improved elevated temperature properties in cellulose esters
AssigneeEastman Chemical Company
InventorDarryl Aubrey Godfrey
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Abstract
In one aspect, the invention relates to a composition comprising a cellulose ester and a high boiling plasticizer having a boiling point greater than 370° C., wherein the composition has a glass transition temperature (Tg) greater than a similar composition having triphenyl phosphate (TPP) plasticizer substituted for the high boiling plasticizer. The invention also related to articles and films made therefrom. This invention also relates to methods of making the compositions, articles and films.
Claims24
A composition comprising:
- a cellulose ester and
- 4 wt % to 13 wt % of a high boiling plasticizer having a boiling point greater than 370° C., wherein the composition has a Tg greater than an otherwise identical composition having only triphenyl phosphate as a plasticizer, and wherein the wt % of plasticizer is based on the total weight of the cellulose ester and the plasticizer.
A method of improving thermal properties of a film, the method comprising
- blending a cellulose ester with 4 to 13 wt % of a high boiling plasticizer having a boiling point greater than 370° C. to form a plasticized cellulose ester;
- and
- optionally blending a low boiling plasticizer with the plasticized cellulose ester, wherein the high boiling plasticizer is in an amount sufficient to raise the Tg of the plasticized cellulose ester by at least about 10° C. in comparison a similar composition having only triphenyl as a phosphate, and wherein the wt % of plasticizer is based on the total weight of the cellulose ester and the plasticizer.
A film comprising a composition comprising:
- a cellulose ester and 4 to 13 wt % of a high boiling plasticizer having a boiling point greater than 370° C., wherein the composition has a Tg greater than an otherwise identical composition having only triphenyl phosphate as a plasticizer, and wherein the wt % of plasticizer is based on the total weight of the cellulose ester and the plasticizer.
A method of making a film, the method comprising:
- blending 4 to 13 wt % of a high boiling plasticizer into a cellulose ester to form a blend composition;
- and
- solvent casting or melt extruding the blend composition to form a film,
- wherein the film has an increased Tg compared to an otherwise identical film wherein the composition has a Tg greater than an otherwise identical composition having only triphenyl phosphate as a plasticizer, and wherein the wt % of plasticizer is based on the total weight of the cellulose ester and the plasticizer.
A method of making a film, the method comprising:
- blending 4 to 13 wt % of a high boiling plasticizer into a cellulose ester to form a blend composition;
- and
- solvent casting or melt extruding the blend composition to form a film,
- wherein the film has an increased Tg and a compared to film wherein the composition has a Tg greater than an otherwise identical composition having only triphenyl phosphate as a plasticizer, and wherein the wt % of plasticizer is based on the total weight of the cellulose ester and the plasticizer.
Dependencies are inferred from the claim text.