GB334581A - Improvements in or relating to the manufacture of articles of rubber and similar substances from aqueous dispersions containing such substances - Google Patents
Improvements in or relating to the manufacture of articles of rubber and similar substances from aqueous dispersions containing such substancesInfo
- Publication number
- GB334581A GB334581A GB17342/29A GB1734229A GB334581A GB 334581 A GB334581 A GB 334581A GB 17342/29 A GB17342/29 A GB 17342/29A GB 1734229 A GB1734229 A GB 1734229A GB 334581 A GB334581 A GB 334581A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parts
- rubber
- addition
- per cent
- formaldehyde
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
- C09D5/4403—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications with rubbers
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
334,581. Dunlop Rubber Co., Ltd., James, R. G., and Twiss, D. F. June 6, 1929. Addition to 301,100. Emulsions, making.-In the electrophoretic de,- position of rubber or other organic material from a dispersion the particles of which normally carry a negative charge, the hydrogen ion concentration is increased in the presence of formaldehyde to such a degree that the charge on the particles is reversed without coagulation occurring; deposition is then effected on the cathode or a porous or semi-permeable mould surrounding it. When depositing from natural or dialyzed ammoniated latex the addition of protective colloids is not necessary, but when treating latices which have been deprived of their natural protective colloids, e.g. by centrifuging, a small addition of a protective colloid such as blood albumen is desirable. In an example 100 parts of preserved natural latex containing 35 parts of rubber and 0.6 parts of ammonia are treated with 38 per cent formaldehyde until the pH value falls to 6. 50 parts of distilled water are then added. 100 parts of 40 per cent acetic acid are then added, whereupon reversal of charge takes place. In another example 100 parts of concentrated latex containing 60 parts of rubber and 0.5 parts of ammonia are treated with sufficient 38 per cent formaldehyde to produce a pH value, measured 10 to 15 minutes after the addition, of 7.5. 100 parts of a neutral aqueous solution containing 0.7 parts of casein previously dissolved in the minimum quantity of dilute ammonia is then added, and finally 100 parts of 60 per cent acetic acid rapidly poured into the well-stirred mixture. It is possible to reduce the pH value by addition of formaldehyde to 4.5 without coagulation, the particules retaining their negative charge. The dispersions treated may be of rubber, guttapercha, balata, or other vegetable resins analogous thereto, unvulcanized or vulcanized and may contain vulcanizing or compounding ingredients and mav be natural or artificial; they may also be of rubber reclaim or synthetic rubber. The dispersions may contain addition agents adapted to prevent formation of gas at the cathode. Specification 331,563 is referred to.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR657948D FR657948A (en) | 1927-07-25 | 1928-07-21 | Process for producing coherent deposits, starting from aqueous dispersions of rubber or substances of the nature of rubber, by means of electric current |
GB17342/29A GB334581A (en) | 1927-07-25 | 1929-06-06 | Improvements in or relating to the manufacture of articles of rubber and similar substances from aqueous dispersions containing such substances |
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1910579X | 1927-07-25 | ||
GB19643/27A GB301100A (en) | 1927-07-25 | 1927-07-25 | Improvements in or relating to the manufacture of articles of rubber and similar substances from aqueous dispersions containing such substances |
GB657948X | 1927-07-25 | ||
GB549219X | 1927-07-25 | ||
GB4095/29A GB331563A (en) | 1927-07-25 | 1929-02-07 | Improvements in or relating to the manufacture of articles of rubber and similar substances from aqueous dispersions containing such substances |
GB567033X | 1929-02-07 | ||
GB17342/29A GB334581A (en) | 1927-07-25 | 1929-06-06 | Improvements in or relating to the manufacture of articles of rubber and similar substances from aqueous dispersions containing such substances |
Publications (1)
Publication Number | Publication Date |
---|---|
GB334581A true GB334581A (en) | 1930-09-08 |
Family
ID=32398440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17342/29A Expired GB334581A (en) | 1927-07-25 | 1929-06-06 | Improvements in or relating to the manufacture of articles of rubber and similar substances from aqueous dispersions containing such substances |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR657948A (en) |
GB (1) | GB334581A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114085395A (en) * | 2021-12-30 | 2022-02-25 | 江苏沃荷乳胶科技股份有限公司 | Natural latex product vulcanization process without formaldehyde residue |
-
1928
- 1928-07-21 FR FR657948D patent/FR657948A/en not_active Expired
-
1929
- 1929-06-06 GB GB17342/29A patent/GB334581A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114085395A (en) * | 2021-12-30 | 2022-02-25 | 江苏沃荷乳胶科技股份有限公司 | Natural latex product vulcanization process without formaldehyde residue |
Also Published As
Publication number | Publication date |
---|---|
FR657948A (en) | 1929-05-29 |
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