Low molecular weight cellulose mixed esters and their use as low viscosity binders and modifiers in coating compositions
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08L-001/00
C08L-001/14
C08L-001/12
출원번호
UP-0796176
(2004-03-09)
등록번호
US-7585905
(2009-09-22)
발명자
/ 주소
Shelton, Michael Charles
Posey Dowty, Jessica Dee
Perdomo, Luis Guillermo Rios
Dixon, Jr., Daniel Wayne
Lucas, Paul Lee
Wilson, Alan Kent
Walker, Kenneth Raymond
Lawniczak, Jonathan Edward
Foulk, Roy Glenn
Phan, Hieu Duy
Freeman, Jr., Charlie Carroll
출원인 / 주소
Eastman Chemical Company
대리인 / 주소
Owen, Polly C.
인용정보
피인용 횟수 :
22인용 특허 :
138
초록▼
Cellulose mixed esters are disclosed having low molecular weights and low degrees of polymerization. These new cellulose mixed esters include cellulose acetate propionate and cellulose acetate butyrate. The esters exhibit solubility in a wide range of organic solvents with minimal viscosity increase
Cellulose mixed esters are disclosed having low molecular weights and low degrees of polymerization. These new cellulose mixed esters include cellulose acetate propionate and cellulose acetate butyrate. The esters exhibit solubility in a wide range of organic solvents with minimal viscosity increase, are compatible with a wide variety of resins, and are useful in coatings and inks compositions as binder resins and rheology modifiers.
대표청구항▼
We claim: 1. A cellulose mixed ester having the following properties: a total degree of substitution per anhydroglucose unit of from 3.08 to 3.50, having the following substitutions: a degree of substitution per anhydroglucose unit of hydroxyl of no more than about 0.70; a degree of substitution pe
We claim: 1. A cellulose mixed ester having the following properties: a total degree of substitution per anhydroglucose unit of from 3.08 to 3.50, having the following substitutions: a degree of substitution per anhydroglucose unit of hydroxyl of no more than about 0.70; a degree of substitution per anhydroglucose unit of C3-C4 esters from about 2.11 to about 2.91, and a degree of substitution per anhydroglucose unit of acetyl of from about 0.10 to about 0.50; an inherent viscosity of from 0.05 to 0.12 dL/g, as measured in a 60/40 (wt./wt.) solution of phenol/tetrachloroethane at 25° C.; a number average molecular weight (Mn) of from about 1,000 to about 5,600; a weight average molecular weight (Mw) of from about 1,500 to about 10,000; and a polydispersity of from about 1.2 to about 3.5. 2. The cellulose mixed ester according to claim 1, wherein the C3-C4 ester comprises butyryl, and wherein the cellulose mixed ester forms a clear solution as a 10 weight percent mixture in methanol. 3. The cellulose mixed ester according to claim 1, wherein the C3-C4 ester comprises butyryl, and wherein the cellulose mixed ester forms a clear solution as a 10 weight percent mixture in ethanol with 5% water, containing methanol, methyl isobutyl ketone, and ethyl acetate as denaturants. 4. The cellulose mixed ester according to claim 1, wherein the C3-C4 ester comprises butyryl, and wherein the cellulose mixed ester forms a clear solution as a 10 weight percent mixture in toluene. 5. The cellulose mixed ester according to claim 1, wherein the C3-C4 ester comprises butyryl, and wherein the cellulose mixed ester forms a clear solution as a 10 weight percent mixture in a 90/10 (by weight) isopropyl alcohol/water blend. 6. The cellulose mixed ester according to claim1, wherein the C3-C4 ester comprises propionyl. 7. The cellulose mixed ester according to claim 1, wherein the degree of substitution per anhydroglucose unit of hydroxyl is from about 0.05 to about 0.70. 8. The cellulose mixed ester according to claim 1, wherein the number average molecular weight (Mn) is from about 1,500 to about 5,000. 9. The cellulose mixed ester according to claim 1, wherein the polydispersity is from 1.2 to 2.5. 10. The cellulose mixed ester according to claim 1,wherein the inherent viscosity is from 0.07 to 0.11 dL/g. 11. The cellulose mixed ester according to claim 1, wherein the number average molecular weight (Mn) is from about 1,000 to about 4,000. 12. The cellulose mixed ester according to claim 1, wherein the C3-C4 ester comprises butyryl, and wherein the cellulose mixed ester exhibits a viscosity no greater than about 200 centipoise as a 50 wt. % solution in a 90/10 by weight mixture of n-butyl acetate/xylene. 13. A coating composition, comprising: a) the cellulose mixed ester according to claim 1; b) one or more coating resins; and c) one or more solvents. 14. The coating composition according to claim 13, wherein the one or more solvents includes water. 15. A coating composition comprising: a) about 0.1 to about 50 weight percent, based on the total weight of (a) and (b) in the coating composition, of the cellulose ester according to claim 1; b) about 50 to 99.9 weight percent, based on the total weight of (a) and (b) in the composition, of at least one resin selected from the group consisting of a polyester, a polyester-amide, a cellulose ester, an alkyd, a polyurethane, an epoxy resin, a polyamide, an acrylic, a vinyl polymer, a polyisocyanate, and a melamine; and c) at least one solvent; wherein the total weight of (a) and (b) is from about 5 to about 85 weight percent of the total weight of (a), (b), and (c). 16. The coating composition according to claim 15, further comprising about 0.1 to about 15 weight percent, based on the total weight of the composition, of one or more coatings additives selected from the group consisting of leveling, rheology, and flow control agents; flatting agents; pigment wetting and dispersing agents; surfactants; ultraviolet (UV) absorbers; UV light stabilizers; tinting pigments; defoaming and antifoaming agents; anti-settling, anti-sag and bodying agents; anti-skinning agents; anti-flooding and anti-floating agents; fungicides and mildewcides; corrosion inhibitors; thickening agents; or coalescing agents. 17. The coating composition of claim 16, further comprising one or more fillers and/or pigments. 18. The coating composition of claim 17, wherein the pigment is comprised of aluminum or mica. 19. A shaped or formed article coated with the composition of claim 15. 20. A metal coated with the composition according to claim 15. 21. The cellulose mixed ester according to claim 1 having an acid value no greater than 5.
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