Substituted cellulose acetates and uses thereof
a technology of cellulose acetate and substituted cellulose, which is applied in the direction of cellulose adhesives, capsule delivery, antimycotics, etc., can solve the problem that the properties of certain cellulose acetate derivatives have not been exhaustively studied
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example 1
[0115]Some adhesive compositions comprising substituted cellulose acetate of the present invention were tested for their adhesive properties on various substrates including wood and cardboard using a lap shear test. These results were compared with commercially available glue (e.g., ELMER'S GLUE ALL®). A summary of the results is shown below in Tables 1A and 1B.
TABLE 1ALap Shear Test ResultsAdhesiveSolventSolidsFormulationBreakDescriptionSystemDrying(wt %)Used (g)(KGF)Polyemulsionambient 540.050358.94(vinyl acetate)- 1 hrbased adhesive(ELMER'S GLUEALL ®)Cellulose Acetateaqueousambient 100.051243.86Adhesive 1 1 hrCellulose Acetateaqueousambient200.0515>107Adhesive 22.25 hrCellulose Acetateaqueousambient150.0506>107Adhesive 32.25 hrCellulose Acetatemixedambient100.0506>107Adhesive 4organic / 2.5 hraqueousCellulose Acetateaqueousambient150.0498>107Adhesive 2 2.5 hrPolyambient270.05 >107(vinyl acetate)-overnightbased adhesive(ELMER'S SCHOOL GLUE)CelluloseAcetateaqueous1 hr oven100.0505...
example 2
[0118]This Example describes the synthesis of a sulfate substituted cellulose acetate of the present invention. In the first step, cellulose was acetylated in the presence of acetic anhydride and sulfuric acid. The preparation of cellulose, acetic acid, acetic anhydride and sulfuric acid is similar to the preparation involved in a standard secondary cellulose acetate diacetate production. Next, the reagents were combined to initiate the acetylation reaction. This reaction was allowed to reach completion and then reacted with any excess anhydride by the addition of water. The reaction rate and temperature may be closely monitored and varied to control certain polymer properties.
[0119]Next, the acetylated cellulose (i.e., cellulose acetate) was hydrolyzed in the presence of acetic acid without precipitation and subsequent redissolving steps. This reduced the cellulose acetate to the target acetate DS levels by carefully controlling the reaction temperature and time. Water was added as...
example 3
[0121]In this Example, a water-swellable cellulose acetate (low sulfur content) and substituted cellulose acetate (high sulfur content) were tested for their ability to absorb water using a thermogravimetric analysis (TGA). Each sample was placed in a TGA system and subjected to the following temperatures. The samples were ramped to 110° C. at 20° C. / min. The temperature was held at 110° C. for 30 minutes. The temperature was then ramped to 650° C. at 20° C. / min. The sample gas was then switched to air and the temperature was held at 650° C. for 30 minutes. In each test run, the cellulose acetate samples were limited to less than 100 mg.
[0122]FIGS. 2-5 show the various TGA analysis runs measuring the water absorbency of high sulfate substituted cellulose acetate and low sulfate substituted cellulose acetate.
[0123]FIG. 2 shows a TGA analysis of water-saturated, water-swellable cellulose acetate (WSCA) 1036 RT-16 dry sample. WSCA 1036 RT-16 is a high sulfate substituted cellulose acet...
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