Cellulose ester and polymeric aliphatic polyester compositions and articles
AssigneeEastman Chemical Company
InventorsHaining An, Wenlai Feng, Michael Eugene Donelson, Thomas Joseph Pecorini
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Abstract
A cellulose ester composition is provided comprising at least one cellulose ester, at least one polymeric aliphatic polyester, at least one impact modifier, and at least one monomeric plasticizer. Processes for producing the cellulose ester compositions as well as articles made using these compositions, such as eyeglass or sunglass frames and/or lenses, are also provided.
Claims20
A cellulose ester composition comprising at least one cellulose ester, at least one polymeric aliphatic polyester (PAP), at least one impact modifier and at least one monomeric plasticizer, wherein said at least one cellulose ester is chosen from cellulose propionate (CP), cellulose butyrate (CB), cellulose acetate propionate (CAP), cellulose acetate butyrate (CAB), cellulose propionate butyrate (CPB), cellulose tripropionate (CTP), or cellulose tributyrate (CTB);
- wherein the PAP is a polymeric aliphatic polyester that comprises either residues of a C2 to C4 alkane diol and residues of C4 to C8 alkyl dicarboxylic acid, or residues of a ring-opened lactone;
- wherein the monomeric plasticizer is present in an amount from 1 to 5 wt %, based on the total weight of the cellulose ester composition;
- wherein said cellulose ester composition has a Tg of at least 110° C. and a notched Izod impact strength of at least 80 J/m, measured according to ASTM Method D256 at 23° C. using a 3.2 mm bar, after conditioning the bar at 23° C. and 50% RH for 48 hours.
Dependencies are inferred from the claim text.