GB481845A - Treatment of cellulose esters - Google Patents

Treatment of cellulose esters

Info

Publication number
GB481845A
GB481845A GB17109/37A GB1710937A GB481845A GB 481845 A GB481845 A GB 481845A GB 17109/37 A GB17109/37 A GB 17109/37A GB 1710937 A GB1710937 A GB 1710937A GB 481845 A GB481845 A GB 481845A
Authority
GB
United Kingdom
Prior art keywords
ester
until
dissolving
acetic acid
per cent
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
GB17109/37A
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 GB481845A publication Critical patent/GB481845A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/16—Regulation of the charging current or voltage by variation of field
    • H02J7/22—Regulation of the charging current or voltage by variation of field due to variation of make-to-break ratio of intermittently-operating contacts, e.g. using Tirrill regulator
    • H02J7/225—Regulation of the charging current or voltage by variation of field due to variation of make-to-break ratio of intermittently-operating contacts, e.g. using Tirrill regulator characterised by the mechanical construction
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B3/00—Preparation of cellulose esters of organic acids
    • C08B3/22—Post-esterification treatments, including purification

Landscapes

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

Abstract

Scrap cellulose organic ester material is rendered suitable for use in moulding compositions by dissolving the ester in glacial acetic acid, adding a small amount of sulphuric acid, heating to 90-150 DEG F. until the viscosity has fallen to a desired value, adding aqueous acetic acid, maintaining the heating until the precipitation value has fallen below 70 per cent, and precipitating with water. The precipitation value is determined by dissolving the ester in a specified amount of acetone and adding aqueous acetone until a mixture is obtained containing 40 per cent of water. The amount of dissolved ester in the clear supernatant liquid is determined and from this is calculated the precipitation value. Particulars are also given of methods for determining viscosity, and for heat, colour and haze tests. Specification 408,952 is referred to.
GB17109/37A 1936-07-03 1937-06-19 Treatment of cellulose esters Expired GB481845A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US481845XA 1915-07-26 1915-07-26

Publications (1)

Publication Number Publication Date
GB481845A true GB481845A (en) 1938-03-18

Family

ID=21953161

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17109/37A Expired GB481845A (en) 1936-07-03 1937-06-19 Treatment of cellulose esters

Country Status (2)

Country Link
FR (1) FR481845A (en)
GB (1) GB481845A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5214137A (en) * 1991-02-08 1993-05-25 Eastman Kodak Company Preparation of cellulose diacetate by recycling processed film

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5214137A (en) * 1991-02-08 1993-05-25 Eastman Kodak Company Preparation of cellulose diacetate by recycling processed film

Also Published As

Publication number Publication date
FR481845A (en) 1917-01-23

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