GB378052A - Improvement in process of removing solvents from plastic colloids - Google Patents

Improvement in process of removing solvents from plastic colloids

Info

Publication number
GB378052A
GB378052A GB6421/31A GB642131A GB378052A GB 378052 A GB378052 A GB 378052A GB 6421/31 A GB6421/31 A GB 6421/31A GB 642131 A GB642131 A GB 642131A GB 378052 A GB378052 A GB 378052A
Authority
GB
United Kingdom
Prior art keywords
tank
alcohol
series
celluloid
plastics
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
GB6421/31A
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.)
Meigs Bassett & Slaughter Inc
Original Assignee
Meigs Bassett & Slaughter Inc
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 Meigs Bassett & Slaughter Inc filed Critical Meigs Bassett & Slaughter Inc
Publication of GB378052A publication Critical patent/GB378052A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/32—Methods and apparatus specially adapted for working materials which can easily be split, e.g. mica, slate, schist
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/08—Cellulose derivatives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/08—Cellulose derivatives
    • C08L1/16—Esters of inorganic acids
    • C08L1/18—Cellulose nitrate, i.e. nitrocellulose

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

Abstract

Solvents are removed from cellulosic plastics by an osmotic process consisting in immersing the plastics in a non-solvent bath which has an osmotic pressure at least as great as that within the plastic, and gradually reducing the osmotic pressure. In an example the treating bath comprises an aqueous solution of alcohol containing approximately 20 per cent by volume of alcohol. Celluloid sheets cut from a block are immersed in the bath and the alcohol is gradually replaced with water. For carrying out the process on a large scale, a series of tanks in which the percentage of alcohol gradually decreases may be used, the celluloid being moved from tank to tank. In another arrangement the tanks are in cascade overflowing from one to the next, the first of the series being fed with water. Periodically the first tank of the series is recharged with celluloid and alcohol solution and water is fed into the next tank, the recharged tank becoming the last of the series. Instead of cutting sheets from a block, the cellulosic plastic may be extruded in sheet form directly into the treating bath. Other baths specified are aqueous solutions of common salt and of sugar. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the application of the osmotic process to other plastics such as vulcanized fibre. This subject-matter does not appear in the Specification as accepted.ALSO:Solvents are removed from cellulosic plastics by an osmotic process consisting in immersing the plastics in a non-solvent bath which has an osmotic pressure at least as great as that within the plastic, and gradually reducing the osmotic pressure. In an example the treating bath comprises an aqueous solution of alcohol containing approximately 20 per cent by volume of alcohol. Celluloid sheets cut from a block are immersed in the bath and the alcohol is gradually replaced with water. For carrying out the process on a large scale, a series of tanks in which the percentage of alcohol gradually decreases may be used, the celluloid being moved from tank to tank. In another arrangement the tanks are in cascade overflowing from one to the next, the first of the series being fed with water. Periodically the first tank of the series is recharged with celluloid and alcohol solution and water is fed into the next tank, the recharged tank becoming the last of the series. Instead of cutting sheets from a block, the cellulosic plastic may be extruded in sheet form directly into the treating bath. Other baths specified are aqueous solutions of common salt and of sugar. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the application of the osmotic process to other plastics such as vulcanized fibre. This subject-matter does not appear in the Specification as accepted.
GB6421/31A 1930-03-04 1931-03-02 Improvement in process of removing solvents from plastic colloids Expired GB378052A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US378052XA 1930-03-04 1930-03-04

Publications (1)

Publication Number Publication Date
GB378052A true GB378052A (en) 1932-08-02

Family

ID=21896439

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6421/31A Expired GB378052A (en) 1930-03-04 1931-03-02 Improvement in process of removing solvents from plastic colloids

Country Status (1)

Country Link
GB (1) GB378052A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015017940A1 (en) * 2013-08-09 2015-02-12 Gd-Ots Canada Valleyfield Inc. Continuous celluloid twin screw extrusion process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015017940A1 (en) * 2013-08-09 2015-02-12 Gd-Ots Canada Valleyfield Inc. Continuous celluloid twin screw extrusion process
US9539752B2 (en) 2013-08-09 2017-01-10 General Dynamics Ordnance and Tactical Systems—Canada Valleyfield, Inc. Continuous celluloid twin screw extrusion process

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