US1947871A - Production of rubber articles - Google Patents

Production of rubber articles Download PDF

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Publication number
US1947871A
US1947871A US661086A US66108633A US1947871A US 1947871 A US1947871 A US 1947871A US 661086 A US661086 A US 661086A US 66108633 A US66108633 A US 66108633A US 1947871 A US1947871 A US 1947871A
Authority
US
United States
Prior art keywords
setting
thread
rubber
dehydrating
dispersions
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 - Lifetime
Application number
US661086A
Other languages
English (en)
Inventor
Murphy Edward Arthur
James Robert Gilbert
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.)
Dunlop Rubber Co Ltd
Original Assignee
Dunlop Rubber Co 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 Dunlop Rubber Co Ltd filed Critical Dunlop Rubber Co Ltd
Application granted granted Critical
Publication of US1947871A publication Critical patent/US1947871A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0078—Producing filamentary materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/02—Direct processing of dispersions, e.g. latex, to articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/731—Filamentary material, i.e. comprised of a single element, e.g. filaments, strands, threads, fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2321/00—Characterised by the use of unspecified rubbers

Definitions

  • This invention is concerned with improve-- ments in the production of articles of, or containing, rubber and is particularly concerned with a process for the production of threads,
  • Patent No. 1,887,190 a process is described and claimed for the manufacture of filaments, threads and tubes of rubber or the like material from aqueous dispersions of the kinds specified therein by causing the dispersions to flow through orifices or jets of any desired shape into contact with a liquid dehydrating and setting medium operating partly or entirely under continuous penetrative osmotic action.
  • the liquid dehydrating and setting medium is preferably a Warm concentrated solution of a saline or other very soluble substance of the type described in British Patent No. 303,544 as, for instance, the concentrated solutions of alkali metal and ammonium salts such as sodium chloride, ammonium chloride or ammonium acetate, or mixtures of such salts, and with or without an acid such as acetic acid or mixture. of acids.
  • the object of the present invention is to modify the process described and claimed in Patent No. 1,887,190 so as to accelerate the rate of formation of thread and so as to permit the process being run continuously for a long time without serious attention, 7
  • the process for the manufacture of threads, filaments and tubes of or containing rubber or the like materials from aqueous dispersions of the kinds hereinafter specified wherein the aqueous dispersions are caused to flow through orifices or jets of any desired shape into contact with a liquid dehydrating and setting medium operating partly or entirely under continuous penetrative osmotic action, comprises employing as the liquid dehydrating and setting medium a mixture comprising a concentrated solution of a largely'dissociated salt of a weak acid that is capable of being largely dissociated and hydrolyzed, and the weak acid itself, preferably added in such amount that the pH value of the medium is not lower than 5.0 and so conditioning the aqueous dispersions to be employed as to make them set readily when brought into contact with the
  • the liquid dehydrating and setting media used according to the present invention are buffer solutions.
  • the ammonium and 'ethanolamine soaps of the fatty acids and colophony are the ammonium and 'ethanolamine soaps of the fatty acids and colophony.
  • the substances which can be employed in this connection consist of a weak acid and a weak base and which are readily decomposed by even a weakly acid coagulant.
  • a coagulant is developed in situ in the dispersions by their interaction with the dehydrating and setting solution, thereby enhancing the rate of coagulation at the centre of the thread.
  • a further advantage obtained in the use of a coagulant of pH value greater than 5.0 is that the risk of porosity in the thread due to decomposition of substances decomposable by acids with evolution of gases, such as sulphides and carbonates, is greatly reduced.
  • the dispersions comprise those consisting of or containing rubber, gutta-percha, balata or similar vegetable resins occurring naturally, or artificially obtained.
  • Such artificial aqueous dispersions may include those of coagulated rubber, vulcanized rubber,
  • any of the aforementioned dispersions may be used alone or in admixture with one another.
  • any of the aforesaid dispersions may contain the usual known compounding ingredients and/ or may be in concentrated form.
  • Example 1 For the production of thread having a diameter .i the order of l/3Gth of an inch, a mixing containing 61% or total solids and of the following composition Parts by weight Rubber 92.5 Sulphur 2.5 Zinc oxide 2.5 Antioxidant 1.0 Accelerator 0.5 Ammonium oleate 1.0
  • the thread so formed will be sufiiciently set to withstand subsequent handling after 30 seconds contact with the setting solution.
  • Example 2 For the production of thread having a diameter of the order or" 1/20th of an inch, a mixing of similar composition to the above is adjusted to an alkalinity equivalent to 0.15 gms. NHs per 100 gm. and to a viscosity which allows 50 cos. to flow from the above mentioned apparatus in 45 seconds. The same procedure is then adopted as in Example 1, but the temperature of the dehydrating and setting solution is braised to 45 C. when the thread will set after 30 second immersion.
  • a process for the manufacture of threads, filaments and tubes of rubber materials from aqueous dispersions thereof which comprises causing the aqueous dispersions to flow in a shaped jet into contact with a liquid dehydrating and setting medium having a continuous penetrative osmotic action, and comprising a concentrated solution of a largely dissociated hydrolyzable salt of a weak acid and free weak acid itself in such amount that the pH value of the medium is not lower than 5.0, and adding to the aqueous dispersions before contact substances substantially inactive to the dispersions aforesaid and capable of being decomposed when brought into contact with the aforesaid weakly acidic medium into substances inducing coagulation within the aqueous dispersions aforesaid.
  • a process of forming continuous articles of rubber material from aqueous dispersions thereof which comprises passing said dispersion admixed with a substance substantially inactive thereto and capable of being decomposed by contact with a weakly acidic medium into coagulation inducing substances in a shaped jet into contact with a liquid dehydrating and setting medium having a continuous penetrative osmotic action and comprising a concentrated solution of a largely dissociated salt of a weak acid and free weak acid itself and of a pH value not lower than 5.0.
  • a process of forming articles of rubber ma-V terial from aqueous dispersions thereof which comprises contacting the surface of a shaped mass of said aqueous dispersion admixed with a substance substantially inactive to said dispersion but decomposable by the action of weakly acidic materials into a coagulating material with a liquid dehydrating and setting medium capable of penetrating said aqueous dispersion and containing a concentrated solution of a largely dissociated salt of a free weak acid and the free weak acid itself and of a pH value not lower than 5.0.
  • a method of setting an aqueous dispersion of rubber-like material containing a substance substantially inactive to the dispersion and decomposable by Weakly acidic media into coagulation inducing substances which comprise penetrating said dispersion from the surface thereof with a liquid dehydrating and setting medium comprising a concentrated solution of a largely dissociated salt of a weak acid and the free weak acid itself and of a pH value not lower than 5.0.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
US661086A 1932-04-19 1933-03-16 Production of rubber articles Expired - Lifetime US1947871A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11162/32A GB393057A (en) 1932-04-19 1932-04-19 Improvements in or relating to the production of articles of or containing rubber

Publications (1)

Publication Number Publication Date
US1947871A true US1947871A (en) 1934-02-20

Family

ID=9981155

Family Applications (1)

Application Number Title Priority Date Filing Date
US661086A Expired - Lifetime US1947871A (en) 1932-04-19 1933-03-16 Production of rubber articles

Country Status (4)

Country Link
US (1) US1947871A (xx)
DE (1) DE585447C (xx)
FR (1) FR754030A (xx)
GB (1) GB393057A (xx)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1274995B (de) * 1965-03-26 1968-08-08 Jiyuichi Nara Trockner fuer in Kluempchen anfallende feinteilige Feststoffe

Also Published As

Publication number Publication date
FR754030A (xx) 1933-10-27
GB393057A (en) 1933-06-01
DE585447C (de) 1933-10-04

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