Cellulose ester and impact modifier compositions and articles made using these compositions
AssigneeEastman Chemical Company
InventorsWenlai Feng, Thomas Joseph Pecorini, Michael Eugene Donelson, Haining An
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Abstract
A cellulose ester composition is provided comprising at least one cellulose ester and at least one impact modifier and optionally at least one plasticizer. Processes for producing the cellulose ester compositions as well as articles made using these compositions, such as eyeglass frames, automotive parts, and toys are also provided.
Claims20
A cellulose ester composition comprising 67 to 99 wt % of at least one cellulose ester, 1 to 30 wt % of at least one impact modifier, and 0 to 3 wt % of at least one plasticizer, based on the total weight of the composition, wherein said cellulose ester is chosen from one or more of 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 said impact modifier is an acrylic core-shell impact modifier;
- and wherein said composition has an HDT value greater than 95° C., and a notched Izod impact strength value greater than 80 J/m measured according to ASTM D256 on 3.2 mm thick bars at 23° C., after conditioning the bars at 230° C. and 50% RH for 48 hours.
A thermoplastic and melt processable cellulose ester composition comprising:
- 70-99 wt % of a cellulose ester comprising one or more of cellulose acetate propionate (CAP), and cellulose acetate butyrate (CAB);
- 0—less than 2 wt % of a plasticizer;
- and
- 1-15 wt % of an acrylic core-shell impact modifier;
- wherein said impact modifier has particle size of 0.01-2.0 um, and wherein said composition has an HDT value greater than 95° C., a notched Izod impact strength value greater than 80 J/m measured according to ASTM D256 on 3.2 mm thick bars at 23° C., and a viscosity of 10,000 P or below at 400 rad/s and 240° C.
Dependencies are inferred from the claim text.