GB338201A - Improvements in or relating to the manufacture of cellulose esters - Google Patents

Improvements in or relating to the manufacture of cellulose esters

Info

Publication number
GB338201A
GB338201A GB25054/29A GB2505429A GB338201A GB 338201 A GB338201 A GB 338201A GB 25054/29 A GB25054/29 A GB 25054/29A GB 2505429 A GB2505429 A GB 2505429A GB 338201 A GB338201 A GB 338201A
Authority
GB
United Kingdom
Prior art keywords
acid
cellulose
per cent
cellulose acetate
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB25054/29A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kodak Ltd
Original Assignee
Kodak Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kodak Ltd filed Critical Kodak Ltd
Publication of GB338201A publication Critical patent/GB338201A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08BPOLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B3/00Preparation of cellulose esters of organic acids
    • C08B3/16Preparation of mixed organic cellulose esters, e.g. cellulose aceto-formate or cellulose aceto-propionate

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

338,201. Kodak, Ltd., (Assignees of Staud, C. J. and Webber, C. S.). Feb. 18, 1928, [Convention date]. Cellulose carboxylates.-Mixed cellulose esters, other than cellulose lacto-formate, are prepared by digesting an acyl ester of cellulose, such as cellulose acetate, with an aliphatic or aromaticaliphatic mono- or di-basic carboxylic acid containing a hydroxyl group in the alpha position. Suitable hydroxy acids mentioned are lactic, tartaric, racemic, glycollic, glyceric, mandelic, and malic acids. The reaction is preferably carried out by digesting a solution of the acyl ester of cellulose in the desired hydroxy acid in a flask fitted with a reflux condenser, at a temperature of about 100‹ C. and at atmospheric pressure. The use of higher pressures is referred to. It is essential that the acyl cellulose ester be soluble in the acid employed, and for this purpose it may be necessary to add a small quantity of water; thus for example, cellulose acetate is soluble in a 75-85 per cent aqueous solution of lactic acid, and in a 77 per cent aqueous solution of tartaric acid. The composition of the mixed ester obtained depends on the extent of the digestion and the amount of water present, the longer the digestion the more does the solubility of the product pass over from solubility in acetone, to solubility in alcohol-water mixtures and finally to solubility in water. The initial acyl ester may or may not be partially hydrolyzed to the acetone soluble stage. In examples, (1) cellulose acetate, hydrolyzed or not, is dissolved in 75-85 per cent lactic acid and heated at 100‹ C. The product is precipitated with acetone, and is soluble in water. (2) Cellulose acetate containing 33 per cent acetyl is dissolved in glycollic acid and heated to 100‹ C. )3) Cellulose acetate containing 33 per cent acetvl is dissolved in tartaric acid containing water and is heated to 100‹ C. (4) Cellulose acetate containing 34.1 per cent acetyl is mixed with glyceric acid and heated to 100‹ C. (5) Cellulose acetate containing 34.1 per cent acetyl is digested with mandelic acid at 120-130‹ C. The product is soluble in an ethylene chloride, methanol mixture. (6) Partially hydrolyzed cellulose acetate is dissolved in a mixture of racemic acid and water, and heated by steam. (7) Cellulose acetomalate is prepared by dissolving cellulose acetate in a saturated aqueous solution of d-l malic acid, or in pure l-malic acid, and heating to 100‹ C. A progressive change is observed from solubility in acetone, in 75 per cent aqueous ethanol, in 50 per cent aqueous ethanol, and finally to solubility in water. Specification 8313/11 is referred to.
GB25054/29A 1929-02-18 1929-08-16 Improvements in or relating to the manufacture of cellulose esters Expired GB338201A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US338201XA 1929-02-18 1929-02-18

Publications (1)

Publication Number Publication Date
GB338201A true GB338201A (en) 1930-11-17

Family

ID=21872632

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25054/29A Expired GB338201A (en) 1929-02-18 1929-08-16 Improvements in or relating to the manufacture of cellulose esters

Country Status (1)

Country Link
GB (1) GB338201A (en)

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