CN112390989A - Natural rubber glove preparation - Google Patents
Natural rubber glove preparation Download PDFInfo
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- CN112390989A CN112390989A CN202010797856.1A CN202010797856A CN112390989A CN 112390989 A CN112390989 A CN 112390989A CN 202010797856 A CN202010797856 A CN 202010797856A CN 112390989 A CN112390989 A CN 112390989A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
- C08L7/02—Latex
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D19/00—Gloves
- A41D19/0055—Plastic or rubber gloves
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
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Abstract
A natural rubber glove formulation comprising a mixture of the following (a) - (i): (a) a base polymer, (b) a pH adjuster, (c) a vulcanization accelerator, (d) a vulcanization activator, (e) an antioxidant, (f) a crosslinking agent, (g) a defoaming agent, (h) a filler dispersion, and (i) an adhesion-promoting agent (optional). Filler dispersions reduce extractable protein content to at most 10 mug/dm2And simulating the acid withTo less than 10mg/dm2. The addition of an adhesion aid to the latex formulation further reduces the extractable protein content in NR gloves. The filler dispersion in the latex formulation is a kaolin filler dispersion. The kaolin filler dispersion comprises: (a) kaolin powder, (b) a pH regulator, (c) a surfactant, (d) a suspending agent, and (e) deionized water. NR gloves produced using latex formulations having a maximum of 10. mu.g/dm2And an extractable protein content of less than 10mg/dm2Resistance to acid mimics.
Description
Technical Field
The invention relates to a latex preparation for glove production and a production method thereof. The main object of the present invention is to produce Natural Rubber (NR) gloves with reduced extractable protein content and increased resistance to acid mimics.
Background
Natural rubber products have gained global preference because natural rubber elastomers have very good elasticity, particularly for natural rubber latex dipped articles such as gloves and condoms. These latex dipped articles are known for their excellent ability to barrier various contaminants. However, the widespread use of latex in turn leads to a dramatic increase in the incidence of allergy to latex proteins.
The natural form of the rubber latex consists of polymerized long chain molecules of isoprene repeating units. When harvested from the rubber tree Hevea brasiliensis (Hevea brasiliensis), the latex is in liquid form and shows a sticky mass. It contains low molecular weight soluble proteins such as chitinase (heavamine) and hevein (heein). Although the basic isoprene unit is non-antigenic, the protein component appears to be responsible for lgE mediated allergic reactions. The allergic reaction is caused by the latex allergen coming into direct contact with the skin of the user or being inhaled into the air. Latex protein allergic reactions caused by latex products include skin irritation and immediate hypersensitivity reactions (type I hypersensitivity reactions).
Although responsible for the allergic reactions, Natural Rubber (NR) latex is the material of choice because it has good barrier properties when used in gloves, particularly medical examination gloves, and is much less expensive than other synthetic alternatives with similar properties to NR latex, such as Polyisoprene (PI) latex and polychloroprene (CR) latex. Therefore, there are many studies on a method for reducing or modifying latex proteins.
EP 2238183B 1 discloses a method of treating natural rubber latex comprising: contacting an unvulcanized natural rubber latex with aluminum hydroxide and a surfactant; and removing at least a portion of the aluminum hydroxide and any antigenic proteins associated with and/or bound to the aluminum hydroxide from the natural latex composition to produce a latex composition having reduced allergenicity.
US 5569740a discloses a process for producing deproteinized NR latex comprising purifying a latex solution produced by the following steps by using a rotating plate membrane separation device: (i) adding water and/or a surfactant to the NR latex and then subjecting the resulting latex solution to a proteolytic treatment, or (ii) subjecting the NR latex to a proteolytic treatment and then adding water and/or a surfactant to the treated NR latex. The deproteinized NR latex is excellent in film forming property and provides a raw rubber film having excellent raw rubber strength.
US 6380283B 1 discloses a method for producing a stable, enzyme-treated and non-deproteinized NR latex. The method comprises the following steps: the enzyme-treated and non-deproteinized NR latex is treated with at least two stabilizers including an alkylbenzene sulfonate derivative stabilizer, a sulfated fatty acid stabilizer, and a low viscosity chemically modified cellulose derivative stabilizer.
Generally, the existing methods have their own disadvantages/drawbacks. Most methods of reducing or modifying latex proteins include: (i) post-production processes, such as chlorination and leaching, and (ii) the addition of modified starch to the compounded latex, can negatively impact the mechanical properties of the latex product. At the same time, the enzymatic treatment methods proposed for modifying latex proteins are expensive and also do not significantly eliminate the allergenicity caused by NR latex. In addition, NR gloves may not be suitable for applications where contact with acidic foods having a pH of less than 4.5 (such as kimchi) is made. This is primarily due to the addition of calcium carbonate filler to the latex formulation. The reaction between the calcium carbonate filler and the acid will produce soluble salts that cause the calcium carbonate filler to leach out of the glove and degrade the glove film. Therefore, gloves generally do not comply with the European Union (EU)10/2011 food handling regulations. Currently, there is no NR latex formulation available to reduce the extractable protein content in NR gloves and increase resistance to acid mimics.
From the foregoing, it is apparent that the prior art methods have their own drawbacks.
Therefore, it is necessary to determine:
(1) suitable formulations and/or compositions to produce NR gloves with reduced extractable protein content and increased resistance to acid mimics suitable for food processing; and
(2) a time and cost saving method to control quality and produce NR gloves with reduced extractable protein content and increased resistance to acid mimics.
Disclosure of Invention
A latex formulation for the production of NR gloves comprising a mixture of: (a) a base polymer, (b) a pH adjuster, (c) a vulcanization accelerator, (d) a vulcanization activator, (e) an antioxidant, (f) a crosslinking agent, (g) a defoaming agent, (h) a filler dispersion, and (i) an adhesion-promoting agent (optional). The filler dispersion reduces extractable protein content to at most 10 [ mu ] g/dm2And increasing the resistance to acid mimics to less than 10mg/dm2. The addition of an adhesion aid to the latex formulation further reduces the extractable protein content in NR gloves. The filler dispersion added to the latex formulation is a kaolin filler dispersion. The kaolin filler dispersion comprises: (a) kaolin powder, (b) a pH regulator, (c) a surfactant, (d) a suspending agent, and (e) deionized water. NR gloves produced using latex formulations having a maximum of 10. mu.g/dm2And an extractable protein content of less than 10mg/dm2Resistance to acid mimics. The NR gloves of the invention have reduced extractable protein content and increased resistance to acid mimics, which are suitable for food processing.
Drawings
The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings, which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
fig. 1 is a graph showing a Transmission Electron Microscope (TEM) image of an NR film with 22phr kaolin filler dispersion without co-extrusion.
Fig. 2 is a graph showing TEM images of NR films with 22phr kaolin filler dispersion with co-sticking.
Detailed Description
Detailed descriptions of preferred embodiments of the invention are disclosed herein. However, it is to be understood that the embodiments are merely examples of the present invention, which can be embodied in various forms. Therefore, the details disclosed herein are not to be interpreted as limiting, but merely as the basis for the claims and as a representative basis for teaching one skilled in the art to which this invention pertains. The numerical data or ranges used in the specification should not be construed as limiting. The following detailed description of the preferred embodiments will now be described, either individually or in combination, with reference to the accompanying drawings.
The invention relates to a latex preparation for glove production and a production method thereof. The main object of the present invention is to produce a catalyst having a maximum of 10. mu.g/dm2And an extractable protein content of less than 10mg/dm2NR glove for tolerance to acid mimics. This is an initiative to reduce the extractable protein content of NR latex and to produce NR gloves suitable for food processing.
According to a preferred embodiment of the invention, the latex formulation comprises a base polymer as the main component.
The latex formulation comprises: (a) a base polymer, (b) a pH adjuster, (c) a vulcanization accelerator, (d) a vulcanization activator, (e) an antioxidant, (f) a crosslinking agent, (g) a defoaming agent, (h) a filler dispersion, and (i) an adhesion-promoting agent (optional). All components were used in parts per hundred rubber (phr) to produce latex formulations.
The base polymer is a pure NR latex. The base polymer was added in the latex formulation in an amount of 100 phr.
The pH adjuster is any one selected from the group consisting of sodium hydroxide, magnesium hydroxide, ammonium hydroxide, and potassium hydroxide, and preferably potassium hydroxide. The amount of pH regulator added to the latex formulation is in the range of 0.03phr to 0.08phr, preferably 0.05 phr.
The vulcanization accelerator is any one selected from the group consisting of a mixture of Zinc Diethyldithiocarbamate (ZDEC) and Zinc Dibutyldithiocarbamate (ZDBC), a mixture of zinc dibenzyldithiocarbamate (ZBEC) and Zinc Diisononyldithiocarbamate (ZDNC), and preferably a mixture of ZDEC and ZDBC. The vulcanization accelerator is added to the latex formulation in an amount in the range of 0.20phr to 1.30phr, preferably 1.10 phr.
The vulcanization activator is any one selected from the group consisting of zinc oxide, magnesium oxide, copper oxide, and aluminum oxide, and is preferably zinc oxide. The vulcanization activator is added in the latex formulation in an amount ranging from 0.3phr to 1.80phr, preferably 1.50 phr.
The antioxidant is any one selected from the group consisting of poly (dicyclopentadiene-co-p-cresol) or alkylated diphenylamine, preferably poly (dicyclopentadiene-co-p-cresol). The antioxidant is added in the latex formulation in an amount ranging from 0.05phr to 1.50phr, preferably 0.10 phr.
The crosslinking agent is sulfur. The amount of the crosslinking agent added to the latex formulation is in the range of 0.01phr to 5.00phr, preferably 1.20 phr.
The antifoaming agent is any one selected from the group consisting of polydimethylsiloxane, emulsion of modified silicone, and mixture of polypropylene-based polyether dispersion, and is preferably polydimethylsiloxane. The amount of the defoamer added to the latex formulation is in the range of 0.01phr to 0.20phr, preferably 0.04 phr.
The filler dispersion is a kaolin filler dispersion. The filler dispersion is added to the latex formulation in an amount ranging from 1phr to 46phr, preferably 22 phr.
The adhesion-promoting agent is any one selected from the group consisting of epoxy resin, amino group, melamine and polyamide, preferably epoxy resin. The adhesion-promoting extrusion is added in the latex formulation in an amount ranging from 0phr to 10phr, preferably 3 phr.
Table 1: a summary of the chemical components (listed above) used in the production of the latex formulations (parts per hundred rubber, phr)
For the purposes of the present invention, the phrase "total dry weight of the base polymer" denotes the total number calculated from the sum of the dry weights of the latex formulations.
The main object of the present invention is to produce latex formulations having a maximum of 10 μ g/dm by using a latex formulation comprising a filler dispersion, in particular a kaolin filler dispersion2And an extractable protein content of less than 10mg/dm2NR glove for tolerance to acid mimics.
The compositions and methods of producing kaolin filler dispersions are described in detail below. The particle size of the kaolin filler dispersion is in the range of 4 μm to 8 μm, preferably 5 μm. The kaolin filler dispersion has a Total Solids Content (TSC) in the range of 40.00 wt% to 53.00 wt%, preferably 50.00 wt%. The pH of the kaolin filler dispersion is adjusted to a range of 9 to 11, preferably 10.
The kaolin filler dispersion formulation comprises: (a) kaolin powder, (b) a pH regulator, (c) a surfactant, (d) a suspending agent, and (e) deionized water. All components (in weight percent,%) were used to produce the kaolin filler dispersion formulation.
The kaolin powder is added to the kaolin filler dispersion formulation in an amount ranging from 40.00% to 53.00% by weight, preferably 50.00% by weight.
The pH adjuster is any one selected from the group consisting of sodium hydroxide, magnesium hydroxide, ammonium hydroxide, and potassium hydroxide, and preferably ammonium hydroxide. The pH modifier is added to the kaolin filler dispersion formulation in an amount ranging from 0.01% to 5.00% by weight, preferably 0.50% by weight.
The surfactant is any one selected from the group consisting of a sodium salt of polyacrylic acid, a maleic acid-acrylic acid copolymer or a salt derived therefrom, a sodium salt of naphthalenesulfonic acid, a sodium salt of sulfosuccinic acid salt, an isomeric tridecanol ethoxylate, or a combination thereof, and is preferably a mixture of a sodium salt of polyacrylic acid and a sodium salt of sulfosuccinic acid salt. The surfactant is added to the kaolin filler dispersion formulation in an amount ranging from 0.01% to 10.00% by weight, preferably 2.00% by weight.
The suspending agent is any one selected from the group consisting of an acrylic copolymer, a polysaccharide, and a cellulose-based material or a combination thereof, and is preferably a mixture of an acrylic copolymer and cellulose. The suspending agent 0 is added in the kaolin filler dispersion formulation in an amount ranging from 0.01% to 5.00% by weight, preferably 1.00% by weight.
The amount of deionized water added to the kaolin filler dispersion formulation is in the range of 45.00% to 60.00% by weight, preferably 46.50% by weight.
TABLE 2. summary of the chemical components used in the production of the Kaolin filler dispersion formulations (as listed above) (%, by weight)
The kaolin filler dispersion formulation is produced using a process comprising the steps of:
i. mixing 40.00% to 53.00% kaolin clay powder, based on the total dry weight of the filler dispersion, with (i) 0.01% to 5.00% pH adjusting agent, based on the total dry weight of the filler dispersion, (ii) 0.01% to 10.00% surfactant, based on the total dry weight of the filler dispersion, (iii) 0.01% to 5.00% suspending agent, based on the total dry weight of the filler dispersion, and (iv) 45.00% to 60.00% deionized water, based on the total dry weight of the filler dispersion, for a time period of 0.5 hours to 2 hours, preferably 1 hour, to produce a mixture; grinding the mixture obtained in step (i) to obtain a kaolin filler dispersion having a 50% particle size in the range of 4 μm to 8 μm, preferably 5 μm.
The following examples are constructed to illustrate the invention in a non-limiting sense.
Composite latex formulations were produced as shown in table 1. Complex latex formulations for the production of a product having a maximum of 10 mug/dm2And an extractable protein content of less than 10mg/dm2NR glove for tolerance to acid mimics. The glove has a reduced extractable protein content and increased resistance to acid mimics. Gloves are produced on a production line according to a conventional leaching process.
After 5 to 7 days of the production date, the gloves were tested for extractable protein content and acid mimic tolerance. The results are summarized in tables 3 and 4 below:
TABLE 3 extractable protein content of chlorinated NR gloves
Table 3 shows the results of extractable protein content of NR gloves obtained with different latex formulations. Suit a gloves containing calcium carbonate filler dispersion (no kaolin filler dispersion added and adhesion and squeeze aids in the latex formulation) had the highest extractable protein content compared to the other suits. Kit C gloves containing kaolin filler dispersant and co-adhesive extrusion had the lowest extractable protein content compared to the other kits. In general, the results show that the addition of a kaolin filler dispersion to a latex formulation can reduce the extractable protein content to less than 10 μ g/dm2. Addition of an adhesion promoter to the formulation (reference set C) further reduced the extractable protein content to less than 0.001. mu.g/dm2。
Referring to the drawings, FIG. 1 is a graph showing a TEM image of an NR film consisting of 22phr of a kaolin filler dispersion without an adhesion promoter. TEM images show the presence of agglomerates of filler, indicating a high extractable protein content. Meanwhile, fig. 2 shows a TEM image of an NR film consisting of 22phr of a kaolin filler dispersion with adhesion promoter. TEM images show agglomerates without fillers, which results in a reduced extractable protein content. Generally, the addition of a co-extrusion aids in the exfoliation of kaolin. Once the kaolin is exfoliated, more amino groups in the protein will hydrogen bond to the kaolin surface and may help reduce the extractable protein content.
TABLE 4 tolerance of acid mimics of chlorinated NR gloves
Table 4 shows the results of the tolerance of acid mimics of gloves obtained from different latex formulations. Suit a gloves containing calcium carbonate filler dispersion (no kaolin filler dispersion and adhesion promoter added to the latex formulation) showed the lowest resistance to 3% acetic acid compared to the other suits. Glove kit B, which contained 22phr of kaolin filler dispersion, exhibited the highest resistance to 3% acetic acid compared to the other gloves. Generally, the results show that the addition of a kaolin filler dispersion to the latex formulation can increase the resistance of the glove to 3% acetic acid.
Based on tables 3 and 4, it is notable that the gloves produced by the present invention have reduced extractable protein content and improved resistance to acid mimics as compared to conventional gloves. Furthermore, the results clearly show that the gloves produced with the latex formulation of the invention are able to meet the food processing regulations required by EU 10/2011. Furthermore, the addition of the kaolin filler dispersion to the latex formulation did not affect the mechanical properties of the glove, wherein the mechanical properties of the glove were similar to the control glove.
The addition of kaolin filler dispersions to latex formulations is beneficial, whereby the use of the latex formulations of the present invention can reduce extractable protein content and increase resistance to acid mimics without negatively impacting the mechanical properties of the glove. Furthermore, according to the present invention, no additional steps are required in the glove production process. Thus, the use of the latex formulation of the present invention appears to be cost and time efficient in controlling quality and producing gloves with reduced extractable protein content and increased resistance to acid mimics.
NR gloves illustrate the work of the present invention; however, the teachings of the present invention can be applied to any other NR latex dipped article with similar properties, such as products like dams, finger cots, condoms, sport belts, etc.
In general, the use of the latex formulations of the present invention allows to overcome the conventional drawbacks, since
1) Latex formulations capable of reducing extractable protein content and increasing the resistance to acid mimics of NR gloves, which are suitable for food processing; and is
2) The method enables quality control and production of NR gloves with reduced extractable protein content and increased resistance to acid mimics in a cost and time efficient manner.
The terminology used herein is for the purpose of describing particular illustrative examples only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having," are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Unless specifically identified as an order of execution, the method steps, processes, and operations described herein are not to be construed as necessarily requiring their execution in the particular order discussed or illustrated. It should also be understood that additional or alternative steps may be employed. The use of the expression "at least" or "at least one" implies the use of one or more elements, as such use may be made in one of the embodiments to achieve one or more desired purposes or results.
Claims (28)
1. A latex formulation comprising a mixture of the following (a) - (g): (a) a base polymer, (b) a pH adjusting agent, (c) a vulcanization accelerator, (d) vulcanizationAn activator, (e) an antioxidant, (f) a cross-linking agent, and (g) a defoamer, characterized in that the latex formulation further comprises (h) a filler dispersion, wherein the filler dispersion reduces the extractable protein content to at most 10 μ g/dm2And increasing the resistance to acid mimics to less than 10mg/dm2。
2. The latex formulation of claim 1, further comprising an adhesion promoter.
3. The latex formulation according to claim 1, wherein the base polymer is pure natural rubber latex in an amount of 100 phr.
4. The latex formulation according to claim 1, wherein the pH adjustor is any one selected from the group consisting of sodium hydroxide, magnesium hydroxide, ammonium hydroxide and potassium hydroxide.
5. The latex formulation of claim 1, wherein the pH adjusting agent is in a range of 0.03phr to 0.08 phr.
6. The latex formulation according to claim 1, wherein the vulcanization accelerator is any one selected from the group consisting of a mixture of Zinc Diethyldithiocarbamate (ZDEC) and Zinc Dibutyldithiocarbamate (ZDBC), and a mixture of zinc dibenzyldithiocarbamate (ZBEC) and Zinc Diisononyldithiocarbamate (ZDNC).
7. The latex formulation of claim 1, wherein the vulcanization accelerator is in a range of 0.20phr to 1.30 phr.
8. The latex formulation according to claim 1, wherein the vulcanization activator is any one selected from the group consisting of zinc oxide, magnesium oxide, copper oxide, and aluminum oxide.
9. The latex formulation of claim 1, wherein the vulcanization activator is in a range of 0.30phr to 1.80 phr.
10. The latex formulation as claimed in claim 1, wherein the antioxidant is any one selected from the group consisting of poly (dicyclopentadiene-co-p-cresol) or alkylated diphenylamine.
11. The latex formulation of claim 1, wherein the antioxidant is in a range of 0.05phr to 1.50 phr.
12. The latex formulation of claim 1, wherein the crosslinking agent is in a range of 0.01phr to 5.00 phr.
13. The latex formulation according to claim 1, wherein the antifoaming agent is any one selected from the group consisting of polydimethylsiloxane, an emulsion of modified silicone, a mixture of polypropylene-based polyether dispersions.
14. The latex formulation of claim 1, wherein the defoamer is in a range of 0.01phr to 0.20 phr.
15. The latex formulation of claim 1, wherein the filler dispersion is a kaolin filler dispersion.
16. The latex formulation according to claim 15, wherein the kaolin filler dispersion comprises: (a) kaolin powder, (b) a pH regulator, (c) a surfactant, (d) a suspending agent, and (e) deionized water.
17. The latex formulation as claimed in claim 16 wherein the kaolin powder is in the range 40.00% to 53.00% by weight.
18. The latex formulation according to claim 16, wherein the pH adjuster is any one selected from the group consisting of sodium hydroxide, magnesium hydroxide, ammonium hydroxide and potassium hydroxide.
19. The latex formulation of claim 16, wherein the pH adjuster is in a range of 0.01 wt.% to 5.00 wt.%.
20. The latex formulation according to claim 16, wherein said surfactant is any one selected from the group consisting of sodium salts of polyacrylic acids, maleic-acrylic acid copolymers or their derived salts, sodium salts of naphthalene sulfonic acid type, sodium salts of sulfosuccinic acid salts, isomeric tridecanol ethoxylates or combinations thereof.
21. The latex formulation of claim 16, wherein the surfactant is in a range of 0.01 wt.% to 10.00 wt.%.
22. The latex formulation according to claim 16, wherein the suspending agent is any one selected from the group consisting of acrylic copolymers, polysaccharides, and cellulose-based materials, or combinations thereof.
23. The latex formulation of claim 16, wherein the suspending agent is in a range from 0.01% to 5.00% by weight.
24. The latex formulation of claim 16, wherein the deionized water is in a range of 45.00 wt.% to 60.00 wt.%.
25. The latex formulation of claim 15, wherein the kaolin filler dispersion is in a range of 1phr to 46 phr.
26. The latex formulation according to claim 2, wherein the adhesion promoter is any one selected from the group consisting of epoxy, amino, melamine, and polyamide.
27. The latex formulation as claimed in claim 2, wherein the adhesion promoter is in the range of 0phr to 10 phr.
28. A natural rubber glove having the latex formulation of any of claims 1 to 27.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MYPI2019004707A MY195840A (en) | 2019-08-16 | 2019-08-16 | Natural Rubber Glove Formulation |
| MYPI2019004707 | 2019-08-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112390989A true CN112390989A (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010797856.1A Withdrawn CN112390989A (en) | 2019-08-16 | 2020-08-10 | Natural rubber glove preparation |
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| Country | Link |
|---|---|
| CN (1) | CN112390989A (en) |
| MY (1) | MY195840A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110289655A1 (en) * | 2010-05-26 | 2011-12-01 | Semperit Aktiengesellschaft Holding | Glove |
| US20140148553A1 (en) * | 2010-11-19 | 2014-05-29 | Imerys Filtration Minerals, Inc. | Reduced allergenicity of natural latex product |
| CN108431117A (en) * | 2015-12-30 | 2018-08-21 | 顶级手套(国际)有限公司 | Hydrogenate nitrile chloride rubber product |
-
2019
- 2019-08-16 MY MYPI2019004707A patent/MY195840A/en unknown
-
2020
- 2020-08-10 CN CN202010797856.1A patent/CN112390989A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110289655A1 (en) * | 2010-05-26 | 2011-12-01 | Semperit Aktiengesellschaft Holding | Glove |
| US20140148553A1 (en) * | 2010-11-19 | 2014-05-29 | Imerys Filtration Minerals, Inc. | Reduced allergenicity of natural latex product |
| CN108431117A (en) * | 2015-12-30 | 2018-08-21 | 顶级手套(国际)有限公司 | Hydrogenate nitrile chloride rubber product |
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| Publication number | Publication date |
|---|---|
| MY195840A (en) | 2023-02-23 |
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Application publication date: 20210223 |