WO2005090412A1 - タンパク質を除去した天然ゴムラテックス、その製造方法及びその用途 - Google Patents
タンパク質を除去した天然ゴムラテックス、その製造方法及びその用途 Download PDFInfo
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- WO2005090412A1 WO2005090412A1 PCT/JP2005/005657 JP2005005657W WO2005090412A1 WO 2005090412 A1 WO2005090412 A1 WO 2005090412A1 JP 2005005657 W JP2005005657 W JP 2005005657W WO 2005090412 A1 WO2005090412 A1 WO 2005090412A1
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- WIPO (PCT)
- Prior art keywords
- natural rubber
- rubber latex
- latex
- protein
- sds
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C1/00—Treatment of rubber latex
- C08C1/02—Chemical or physical treatment of rubber latex before or during concentration
- C08C1/04—Purifying; Deproteinising
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F6/00—Contraceptive devices; Pessaries; Applicators therefor
- A61F6/02—Contraceptive devices; Pessaries; Applicators therefor for use by males
- A61F6/04—Condoms, sheaths or the like, e.g. combined with devices protecting against contagion
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
- A61L29/04—Macromolecular materials
- A61L29/041—Macromolecular materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
- A61L29/042—Rubbers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
- A61L31/04—Macromolecular materials
- A61L31/048—Macromolecular materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
- A61L31/049—Rubbers
Definitions
- the present invention relates to a natural rubber latex from which proteins have been removed, a method for producing the same, and uses thereof. More specifically, the present invention relates to a natural rubber latex substantially free of a specific molecular weight protein specific to natural rubber latex, a method for producing the same, and a use thereof. Background art
- natural rubber has been widely used in industrial products such as automobile tires, aircraft tires, and belts.
- Such natural rubber is collected as latex containing water, proteins, inorganic salts, etc. in addition to the rubber component, and the latex is coagulated to obtain raw rubber (crepe rubber or smoked rubber).
- raw rubber crepe rubber or smoked rubber
- the desired rubber product is manufactured through mastication, compounding of compounding agents, molding, and vulcanization.
- Many industrial products are also produced from natural rubber latex itself. For example, it is used in the manufacture of balloons for toys, medical supplies such as rubber gloves, catheters and condoms, foams (foam rubber), rubber threads, rubber tubes, adhesives, and coating agents for paper processing.
- Fresh latex of natural rubber contains non-rubber components such as proteins, lipids, carbohydrates and minerals in addition to a rubber content of about 28 to 30% (weight Zvolum).
- Solid natural rubber (raw rubber) obtained by coagulating this fresh latex with formic acid contains about 6% by weight of non-rubber components. It is known that these non-rubber components are important for natural rubber to exhibit unique physical properties.
- non-rubber components are important for natural rubber to exhibit unique physical properties.
- the present inventor has conducted a detailed study on proteins in natural rubber latex.
- the proteins in natural rubber are present on the latex award solution (serum) and on the surface of the rubber particles. And that it was difficult to remove all of the protein with normal proteinase.
- the protein in the serum can be removed, but the protein on the surface of the rubber particles cannot be removed.
- the protein on the surface of the rubber particles can be degraded to some extent by the proteolytic enzyme. could not be completely removed from the latex, possibly leaving some potential allergen proteins.
- proteins on the surface of the rubber particles can be decomposed, but during the treatment, the rubber particles coagulate, making it difficult to carry out these reactions in a latex state stably. It was.
- an object of the present invention is to investigate a causative substance in which type I allergy develops, and to provide a natural rubber latex from which the causative substance has been removed based on the fact of the investigation.
- Another object of the present invention is to provide an industrially advantageous method for producing the natural rubber latex of the present invention.
- Still another object of the present invention is to provide products such as catheters, rubber gloves, condoms, foams, etc., made of the above natural rubber of the present invention.
- the above-mentioned object and advantages of the present invention are, firstly, characterized in that it is substantially free of proteins identified by the respective bands of 14, 31 and 45 kDa by SDS-PAGE.
- natural rubber latex is: secondly, the natural rubber latex of the present invention, which is characterized in that natural rubber latex is saponified with an alkali hydroxide in the presence of a surfactant. This is achieved by a method for producing rubber latex.
- FIG. 1 shows the results of SDS-PAGE measurement of the saponified natural rubber latex of Example 1.
- Figure 2 shows the results of SDS-PAGE measurement of fresh natural rubber latex.
- Figure 3 shows the results of SDS-PAGE measurement of the cream phase of natural rubber latex deproteinized with proteolytic enzymes.
- FIG. 4 shows the results of SSD-PAGE measurement of the cream phase of the saponified natural rubber latex obtained in Examples 2 to 4.
- Figure 5 shows part of a glove made from genated natural rubber latex (1 in Figure 5) and part of a glove made from deproteinized natural rubber latex (2 in Figure 5).
- the collected fresh natural rubber latex has a concentration of about 30% DRC (dryer content).
- a surfactant is added to this latex, and the protein is hydrolyzed by reacting with alkali hydroxide under certain conditions, and then concentrated to about 60% DRC by centrifugation (this process is referred to as concentration and washing).
- the method of producing a low-nitrogen-containing natural rubber latex by a protease that has already been proposed by one of the present inventors requires that the reaction between the latex and the protease be performed with latex having a concentration of about 10% DRC.
- This method is significantly different from the present invention, and is superior in terms of the manufacturing process. Furthermore, the degree of deproteinization of specific molecular weights is much better with this method.
- the method for producing a natural rubber latex of the present invention comprises a cationic surfactant, an anion interface
- a natural rubber latex was saponified with alkaline hydroxide in the presence of at least one surfactant selected from the group consisting of a surfactant and a nonionic surfactant, and was then desorbed by saponification, for example. This is performed by removing and washing the protein by centrifugation.
- the coagulation of the latex can be prevented by using a cation surfactant, an anion surfactant or a nonionic surfactant as described above.
- a cation surfactant an anion surfactant or a nonionic surfactant as described above.
- nonionic surfactant to be used examples include polyoxyalkylene ether-based, polyoxyalkylene ester-based, polyhydric alcohol fatty acid ester-based, sugar fatty acid ester-based, and alkyl polyglycoside-based. More specifically, examples of the polyoxyalkylene ether-based nonionic surfactant include a polyoxyalkylene alkyl ether, a polyoxyalkylene alkyl phenyl ether, a polyoxyalkylene polyol alkylene ether, and a polyoxyalkylene styrenated phenol. And polyoxyalkylene distyrenated phenol ethers, and the like.
- polyoxyalkylene polyol of the polyoxyalkylene polyol alkylene ether examples include polyhydric alcohols having 2 to 12 carbon atoms. Examples include propylene glycol, glycerin, sorbitol, sucrose, pendus erythritol, sorbitan, and the like.
- polyoxyalkylene ester-based nonionic surfactant examples include a polyoxyalkylene fatty acid ester.
- polyhydric alcohol fatty acid ester nonionic surfactant examples include a fatty acid ester of a polyhydric alcohol having 2 to 12 carbon atoms and a fatty acid ester of a polyoxyalkylene polyhydric alcohol. More specifically, for example, sorbitol fatty acid ester, sorbitan fatty acid ester, fatty acid monoglyceride, fatty acid diglyceride, polyglycerin fatty acid ester and the like can be mentioned. Also this These polyalkylene oxide adducts, for example, polyoxyalkylene sorbin fatty acid esters, polyoxyalkylene glycerin fatty acid esters, and the like can also be used.
- sugar fatty acid ester-based nonionic surfactant examples include sucrose, glucose, mantose, fructose, fatty acid esters of polysaccharides, and the like, and polyalkylene oxide adducts thereof can also be used.
- alkylpolydaricoside nonionic surfactant examples include alkyldarcoside, alkylpolydarcoside, polyoxyalkylenealkyldarcoside, and polyoxyalkylenealkylpolydarcoside. These polyalkylene oxide adducts can also be used.
- the fatty acid of the polyhydric alcohol fatty acid ester-based and sugar fatty acid ester-based surfactants preferably includes, for example, a linear or branched saturated or unsaturated fatty acid having 4 to 30 carbon atoms.
- alkyl group in the surfactant examples include an alkyl group having 4 to 30 carbon atoms.
- polyoxyalkylene group examples include those having an alkylene group having 2 to 4 carbon atoms, for example, those having an addition mole number of ethylene oxide of about 1 to 50 mol.
- anionic surfactant examples include carboxylic acid-based, sulfonic acid-based, sulfated-ester-based, and phosphate-based surfactants.
- carboxylic acid-based surfactant examples include fatty acid salts having 6 to 30 carbon atoms, polyvalent ribonates, rosinates, and tall oil fatty acid salts, and preferably 10 to 20 carbon atoms. Is a carboxylate. When the number of carbon atoms is less than 6, dispersion and emulsification of proteins and impurities are insufficient, and when the number of carbon atoms exceeds 30, it is difficult to disperse in water.
- sulfonic acid-based surfactant examples include an alkyl benzene sulfonate, an alkyl sulfonate, an alkyl naphthalene sulfonate, a naphthalene sulfonate, and a diphenyl ether sulfonate.
- sulfate-based surfactant examples include an alkyl sulfate, a polyoxyalkylene alkyl sulfate, and a polyoxyalkylene alkylphenate. And the like. Sulfuric acid sulfate, tristyrenated phenol sulfate, polyoxyalkylenedistyrene phenol sulfate, and the like.
- salts of these compounds include metal salts such as Na, K :, Ca, Mg, and Zn salts, ammonia salts, and amine salts such as triethanolamine salts.
- phosphate-based surfactant examples include an alkyl phosphate ester salt and a polyoxyalkylene phosphate ester salt.
- the salts of these compounds include metal salts such as Na, K, Ca, Mg, and Zn salts, ammonia salts, and amine salts such as triethanolamine salts.
- the amount of the surfactant as described above is preferably 0.01 to 5.0% (w / v) based on the rubber latex, and more preferably 0.03 to 5.0% (w / v).
- a necessary amount of surfactant can be added in order to enhance the stability of the natural rubber latex during storage.
- alkali hydroxide for example, sodium hydroxide and potassium hydroxide are preferably used.
- the amount of alkali used is 0.
- An amount of 1 to 10% (w / v) is preferred. If it is less than 0.1%, the reaction takes too much time, and if it exceeds 10%, the coagulation reaction tends to occur easily. A more preferred amount is from 0.3 to 8%.
- the natural rubber latex treated with alcohol hydroxide and a surfactant can be either fresh natural rubber latex or high ammonia latex.
- the reaction time is not particularly limited, but the reaction is preferably performed for several minutes to about one day.
- the latex may be stirred or may be allowed to stand, but stirring is preferred from the viewpoint of accelerating the reaction.
- the temperature may be adjusted as required, and the preferred temperature is 5 ° C to 90 ° C, more preferably 20 ° C to 70 ° C.
- the deproteinized natural rubber latex is concentrated to about 50 to 70%. By this process, the hydrolyzed protein is soluble in water, and the higher the concentration, the more the protein migrates into the serum and is removed from the latex. Special enrichment means However, any method such as heat concentration, centrifugation, dialysis, or ultrafiltration is used.
- the concentrated natural rubber latex can be diluted once again to about 10% or more and further concentrated to sufficiently remove the remaining protein degradation products to obtain a purified natural rubber latex.
- the remaining hydrolyzed protein usually does not require any special treatment for commercialization.
- the stability of the natural rubber latex must be sufficiently maintained, and in that sense, the type and amount of the surfactant used are important factors.
- MST value Mechanism Stability Time-ASTM D 1076_97
- the natural rubber latex produced by degrading the protein produced by the method of the present invention described above was analyzed by SDS-PAGE (SDS-Polyaryl amid Gel Electrophoresis method) to show 14, 31, and 45 kD. This is characteristic in that the protein specified by each band of a is substantially not contained, and is different from the conventionally known natural rubber latex having a reduced nitrogen content in this point.
- the fact that the specific protein is not contained in the natural rubber latex means the following. That is, this natural rubber latex was extracted with an aqueous solution of SDS (Sodi urn dode cy lsu 1 fate), and the extract was dialyzed with a membrane with a cutoff molecular weight of 3.5 kDa. The precipitate was collected by centrifugation, washed with acetone, dissolved in an aqueous urine solution, and subjected to SDS-PAGE (Po 1 yacry 1 amidge) as an extract equivalent to a 6-fold concentration. No protein is detected, as measured using the Electrophoresis method.
- SDS Sodi urn dode cy lsu 1 fate
- natural rubber latex with a reduced nitrogen content produced by the conventional method of treatment with a surfactant and proteolytic enzyme contains SDS-PAGE. Analysis of the method revealed that these bands appeared even when the nitrogen content was less than 0.02%, and that certain evening proteins were not completely removed. Specifically, when compared at the same level of nitrogen content, the natural rubber latex of the present invention showed that each of the bands of 14, 31, and 45 kDa was substantially all analyzed by SDS-PAGE. Or completely disappeared, but it was found that the above-mentioned band was present, albeit very slightly, in the natural rubber latex obtained by the above-mentioned conventional method.
- the natural rubber latex of the present invention which is different from the conventional natural rubber latex as described above is provided in a natural rubber latex in which deproteinization is achieved by a protease, in which a partial bond between rubber and protein is formed by a protease. Whereas the nitrogen content is reduced by the selective cleavage, the deproteinization by saponification using the hydroxylase of the present invention provides a non-selective and stoichiometric bond between rubber and protein. At the same time as the protein was cleaved, the protein itself was hydrolyzed to lower molecular weight.
- the natural rubber latex of the present invention is not limited to its residual nitrogen content, and is characterized by 14, 31 and 45 kDa when analyzed by the SDS-PAGE method specific to natural rubber latex. This is characteristic in that it does not substantially contain the protein of each band.
- Fresh latex adjusted to 30% DRC (Dry Rubber Content) (abbreviated as FL latex) 1.
- 10 OmL of an aqueous solution containing 30 g of sodium hydroxide in 9 L, and a nonionic surfactant, Emu1 4 g of gen-70 (polyoxyetheylene nonylphenyl ether) was added, and the saponification reaction was performed at 70 ° C for 3 hours.
- the latex solution was centrifuged at 13,000 rpm for 8 minutes to separate the cream phase, and then the cream phase was adjusted to 60% DRC by adding water. Then, 0.5 g of ammonium laurate was added.
- the proteins present in the cream phase and serum phase of the saponified natural rubber latex thus prepared were measured by SDS-PAGE.
- the protein contained in the cream phase was measured as follows.
- lane 1 shows the measurement results.
- lane 1 shows the standard molecular weight marker 1
- lane 2 shows the cream phase
- lane 3 shows the serum phase. It is a measurement result.
- SDS-PAGE measurement of the cream phase and serum phase obtained by centrifuging fresh natural rubber latex under the same conditions are shown in FIG.
- fresh natural rubber latex adjusted to 10% DRC, proteinase A 1 ca 1ase 2.0T (NOVO Nordisk Bioindustry Co.) and 1.0% SDS were added, and the mixture was added at room temperature. After reacting for 24 hours, the mixture was centrifuged at 15,000 rpm, and concentrated to 60% DRC and washed twice.
- the cream phase was separated from the deproteinized natural rubber latex and subjected to SDS-PAGE measurement. The result is shown in FIG.
- Lane 2 (cream phase) in Figure 1 shows no protein-specific band in natural rubber latex (see lane 3 in Figure 2), and the cream phase of this saponified natural rubber latex was determined by SDS-PAGE. It was revealed that the 14, 31 and 45 kDa bands did not contain the proteins shown.
- lane 3 (serum phase) in Fig. 1 a band appears in the low molecular weight region. This is because the protein in the natural rubber latex is hydrolyzed by sodium hydroxide by the saponification reaction. This is considered to mean that it is decomposed into low molecular weight proteins and eluted in water.
- Table 1 shows the saponification conditions. The experiment was performed under the same conditions as in Example 1 except for the saponification conditions. The cream phase of these genated natural rubber latexes did not show any of the 14, 31, and 45 kDa bands as a result of SDS-PAGE measurement.
- table 1 In the table, saponification conditions indicate the NaOH concentration (wZv%), reaction temperature, and reaction time.
- Lane 1 shows the standard molecular weight.
- Lanes 2, 3, and 4 are SDS-PAGE measurement diagrams of the cream phase of the natural rubber latex saponified in Examples 2, 3, and 4, respectively. Examples 5 to 6
- Example 2 The operation was performed in the same manner as in Example 1. However, the compounds in Table 2 were used as surfactants instead of Emu 1 gen-70. As a result, it was found that the latex of each Example did not contain proteins of each band of 14, 31 and 45 kDa by SDS-PAGE measurement. Table 2
- Example 7 An allergy test was performed on genated deproteinized natural rubber latex (SAP-NR). It was determined whether it contained an immediate type I allergy antigen.
- Hev bl MW 14.6 kDa
- Hev b3 MW 22.3 kDa
- Hev b5 MW 17.5kDa
- Hev b6.02 MW 4.7 kDa for Rubber elongation factor, Small rubber Particle protein, Acidic latex protein, and Protein called Mature Hevein.
- Rubber elongation factor Rubber elongation factor
- Small rubber Particle protein Small rubber Particle protein
- Acidic latex protein Acidic latex protein
- Protein called Mature Hevein Protein
- Natural rubber latex is marketed as latex, and the storage stability of latex is an important indicator. 4 shows the results of the stability measurement of the latex of the present invention. An experiment was performed using a surfactant of Ema 1 E 70 C and Emu 1 g en -70 during the saponification of natural rubber latex.
- Fresh latex adjusted to 30% DRC (abbreviated as FL latex) 1.
- 9 10 OmL of an aqueous solution containing 30 g of sodium hydroxide and 4 g of the above surfactant were added, and a saponification reaction was carried out at 70 ° C for 3 hours.
- This latex was centrifuged at 13, OOO rpm for 8 minutes to separate the cream phase, and water was added to the cream phase to adjust to 60% DRC.
- the Zeta potentia 1 (mV) of this latex was -44 mV for Ema1E70C and -44 mV for Emu1gen-70.
- the value of Zetapotentia 1 for natural rubber latex was 46 mV, confirming that the colloidal properties of the natural rubber latex were not different from those of natural rubber latex.
- MST Mechanism Stability Test—ASTM D 1076—97
- Example 4 shows properties of a vulcanized rubber film obtained from a genated natural rubber latex.
- the properties of the film (F-1) made from the genated natural rubber latex and the film (F-2) made from the compound saponified natural rubber latex having the composition shown in Table 4 were examined.
- the saponified natural rubber latex was produced in the same manner as in Example 1.
- a film was prepared by casting a natural rubber latex on a glass substrate.
- the compound latex formulated according to the formulation shown in Table 4 was pre-vulcanized at room temperature for 2 days. This compound latex was cast on a glass substrate and stored for 2 days to produce a thin film. The dried film was cured by heating at 120 ° C. for 15 minutes.
- Anti-aging agent W ings st a y L Table 5
- Rubber gloves were prepared using saponified natural rubber latex.
- the preparation method was as follows: pre-vulcanization of the compounded latex (F-2) of Example 9 for 2 days, immersion in a water solution of coagulant (calcium nitrate) for 20 seconds, and drying at 100 ° C. They were immersed in the latex for 25 seconds, removed, and heat-treated (post-cured) at 120 ° C for 30 minutes. Rinse for 30 to 60 seconds and remove from mold.
- a photograph of the obtained rubber glove is shown in Figure 5-1. Decomposed with proteolytic enzyme as raw material for comparison Fig. 5-2 shows rubber gloves prepared by the same method using proteinized natural rubber latex. Tiger stripes are clearly visible on this glove.
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JP2006511339A JP5140272B2 (ja) | 2004-03-24 | 2005-03-22 | タンパク質を除去した天然ゴムラテックス、その製造法及びその用途 |
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US5910567A (en) * | 1995-03-14 | 1999-06-08 | Fuji Latex Co., Ltd. | Process for preparing deproteinized natural rubber latex molding and deproteinizing agent for natural rubber latex |
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AU781386B2 (en) * | 2000-11-08 | 2005-05-19 | Kao Corporation | Method of preparing low allergic natural rubber latex and deproteinized natural rubber latex, and low allergic natural rubber and deproteinized natural rubber |
JP2004197052A (ja) * | 2002-12-20 | 2004-07-15 | Sumitomo Rubber Ind Ltd | 脱蛋白天然ゴムラテックスの製造方法 |
CN1832967B (zh) * | 2003-08-04 | 2010-04-21 | 住友橡胶工业株式会社 | 除去了蛋白质的天然橡胶、其组合物及用途 |
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2005
- 2005-03-22 WO PCT/JP2005/005657 patent/WO2005090412A1/ja active Application Filing
- 2005-03-22 CN CNB2005800132847A patent/CN100487001C/zh not_active Expired - Fee Related
- 2005-03-22 JP JP2006511339A patent/JP5140272B2/ja not_active Expired - Fee Related
- 2005-03-23 MY MYPI20051248 patent/MY149882A/en unknown
Patent Citations (1)
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JP2003020301A (ja) * | 2001-07-06 | 2003-01-24 | Sumitomo Rubber Ind Ltd | 低アレルギー性天然ゴムラテックスの製造方法 |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2377892A4 (en) * | 2008-12-15 | 2012-05-23 | Sumitomo Rubber Ind | NATURAL RUBBER AND MANUFACTURING METHOD THEREOF, RUBBER COMPOSITION AND TIRE USING THE SAME, MODIFIED NATURAL RUBBER AND METHOD FOR MANUFACTURING SAME, AND RUBBER COMPOSITE FOR COVERING CARCASS WIRES OR CABLES AND TIRE USING THE SAME |
JP2011012159A (ja) * | 2009-07-01 | 2011-01-20 | Sumitomo Rubber Ind Ltd | パンクシーリング剤 |
WO2011027739A1 (ja) * | 2009-09-01 | 2011-03-10 | 国立大学法人長岡技術科学大学 | 蛋白質フリー天然ゴム及びそのラテックスとそれらの製造方法 |
US8476348B2 (en) | 2009-09-01 | 2013-07-02 | National University Corporation Nagaoka University Of Technology | Protein-free natural rubber, latex thereof, and method for manufacturing said rubber and latex |
JP2011153293A (ja) * | 2010-01-04 | 2011-08-11 | Sumitomo Rubber Ind Ltd | タイヤ用ゴム組成物及びスタッドレスタイヤ |
CN101890779A (zh) * | 2010-07-27 | 2010-11-24 | 郑林 | 一种可溶性蛋白质含量低的手套及其制造方法 |
CN101934587A (zh) * | 2010-07-27 | 2011-01-05 | 郑林 | 一种无硫无亚硝胺的乳胶手套及其制造方法 |
JP2016214234A (ja) * | 2015-05-21 | 2016-12-22 | 株式会社トクヤマ | 家畜用乳頭パック材料及び乳用家畜の乳房炎予防方法 |
WO2017207912A1 (fr) | 2016-05-31 | 2017-12-07 | Compagnie Generale Des Etablissements Michelin | Procede de sechage d'un caoutchouc naturel |
JP7011354B1 (ja) | 2021-03-22 | 2022-01-26 | 雪ヶ谷化学工業株式会社 | 変色防止された天然ゴムラテックススポンジ及びその製造方法 |
JP2022146578A (ja) * | 2021-03-22 | 2022-10-05 | 雪ヶ谷化学工業株式会社 | 変色防止された天然ゴムラテックススポンジ及びその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
MY149882A (en) | 2013-10-31 |
JPWO2005090412A1 (ja) | 2008-01-31 |
CN100487001C (zh) | 2009-05-13 |
CN1946744A (zh) | 2007-04-11 |
JP5140272B2 (ja) | 2013-02-06 |
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