TW200300155A - Polychloroprene latex composition, water-base primer and adhesive bonding process - Google Patents

Abstract

The invention provides a water-base primer or adhesive capable of giving a bond strength equivalent to that of organic solvent type primers or adhesives of the prior art; specifically, a polychloroprene latex composition which comprises as the essential components polychloroprene and sodium orthosilicate in a state dispersed or dissolved in water and further contains polyethyleneimine and a tackifier resin; adhesive bonding is conducted by using a water-base primer containing the latex composition.

Description

200300155 A7 B7 V. Description of the invention (彳) Technical scope (please read the precautions on the back before filling in this page) The present invention is a discovery of good adhesion strength for adherends such as rubber elastomers and synthetic resins. The main component of the water-based adhesive or water-based primer of these adherends is a useful polychloroprene-based latex composition. Technical background Conventionally, a method for adhering difficult-to-be-adhered adherends such as a rubber elastomer synthetic resin mainly uses a solvent-based primer or an adhesive. However, for a solvent-based method, a large amount of toluene and ethyl acetate are used , Methyl ethyl ketone, the safety and health aspects of the operator, the environment is not good. Therefore, the requirements for the hydration of the adhesive or the primer are increasing every year, for example, the formation of several proposals such as JP 2 0 1-6 4 6 1 6 or JP 2 0 1-2 6 7 5 6 and the like. However, for practical use, there is still a lack of adhesive strength. In view of the present situation, the present invention provides a suitable polychloroprene system for the main component of a water-based primer or a water-based adhesive in order to match the strength of a conventional solvent-based primer or a pressure-sensitive adhesive. The purpose of the latex composition is to print and invent the invention printed by the employee's consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. The inventor repeated the results of careful and comprehensive review in order to achieve the above-mentioned purpose. Polychloroprene and sodium orthosilicate are essential ingredients It can be seen that the polychloroprene-based latex composition dispersed or dissolved in water has excellent adhesion strength to adherends such as rubber elastomer synthetic resins, so that this paper scale applies Chinese national standards (CNS Γα4 specification (210X 297 mm) c. 200300155 A7 B7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (2) The invention was completed. That is, the invention has the following gist. (1 ) Polychloroprene-based latex composition with polychloroprene and sodium orthosilicate as essential components, each of which is characterized by being dissolved in water or being dissolved. (2) Polychloroprene-based latex composition The solid content concentration is 40 to 70% by weight, and is a polychloroprene-based latex composition described in (1) above. (3) The content of sodium orthosilicate is polychloroprene (solid content ) 100 parts by weight, containing 0.1 to 30 parts by weight of the polychloroprene-based latex composition described in (1) or (2) above. (4) Polyethyleneimine is polychloroprene ( The solid content) is in a range of 100 parts by weight, and contains from 0.1 to 5 parts by weight. The polychloroprene-based latex composition described in any one of (1) to (3) above. (5) Adhesive administration The resin is in the range of 100 parts by weight of polychloroprene (solid content). The resin contains 1 to 80 parts by weight of the polychloroprene-based latex composition described in any one of (1) to (4) above. (6) The thickener is in a range of 100 parts by weight of polychloroprene (solid content), and contains 0.01 to 10 parts by weight of the polychloroprene described in any one of (1) to (5) above. (7) The polychloroprene-based latex composition described in any one of (1) to (6) above. (8) The water-based primer described in (7) above will adhere to the body Sticking method In order to implement the best form of the invention (Please read the precautions on the back before filling out this page} · # Order

This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -6- 200300155 A7 B7 V. Description of the invention (3) The content of the present invention will be described in detail below. The polychloroprene used in the present invention System 2—Homopolymer of chloro-1,3 butadiene (hereinafter referred to as chloroprene) or monomer and copolymer that are possible by copolymerization of chloroprene and chloroprene. The copolymer shown here is a graft copolymer in which other monomers are subjected to graft polymerization in the presence of polychloroprene. For the chloroprene mentioned above and the ideal monomer for copolymerization, for example, 2,3 dichloro-1,3 butadiene, 1-chloro-1,3 butadiene, butadiene, isoprene Diene, styrene, acrylonitrile, acrylic acid or its esters, methacrylic acid or its esters are recommended, and two or more types should be used if necessary. The polymerization method for obtaining polychloroprene and chloroprene is not particularly limited, and it is general and simple according to the emulsion polymerization method. To make the polychloroprene latex suitable for use in the present invention, it is necessary to disperse the polychloroprene in water, and when the polychloroprene is obtained by emulsion polymerization, the obtained polychloroprene can be obtained. Use the latex as it is. The emulsifier and / or dispersant used in the emulsion polymerization method of polychloroprene-based latex is not particularly limited, and various anionic, non-ionic, and cationic types can be used in general chloroprene latex. of. Anionic emulsifiers are carboxylic acid type, sulfonic acid type, sulfuric acid ester type, and the like. For example, alkali metal salts of rose acid, alkyl sulfonates of 8 to 20 carbon acids, and alkyl aromatics can be recommended. Salts of sodium sulfide, sodium naphthalenesulfonate, formaldehyde and its condensates, and the like. Specific examples of non-ionic types include polyvinyl alcohol or its copolymers (such as acrylamide and its copolymers), polyvinyl ether or its copolymers. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm). (Please read the notes on the back before filling this page)

Printed by the Employees 'Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 200300155 A7 B7 Printed by the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Vinyl acetic acid and its copolymers) or these (co) polymers are chemically modified, or fiber derivatives (via ethyl cellulose), etc., for specific examples of cationic types, aliphatic amines can be recommended Salt, aliphatic grade 4 ammonium salt, etc. For example, octadecyltrimethylammonium chloride, lauryltrimethylammonium chloride, dilauryldimethylammonium chloride, and the like. The emulsifier and / or dispersant in the polychloroprene-based latex is a total of 1 when the emulsifier and / or dispersant and the initial monomers of the chloroprene are cut off during the polymerization of chloroprene. 〇 The mass part is preferably contained in an amount of 0.5 to 20 mass parts. If the content is less than 5 mass parts, the emulsification power is insufficient. If the mass part exceeds 20 mass parts, there is a shortcoming that the water resistance is reduced. The polymerization temperature when the polychloroprene-based latex is polymerized in the present invention is not particularly limited. It is desirable to set the polymerization temperature to 0 to 50 ° C in order to successfully perform the polymerization reaction. The polymerization initiator is a persulfate such as potassium persulfate. Organic peroxides, such as the 3rd-butyl hydroperoxide, etc. These can be used suitably, It is not limited. In the polymerization of chloroprene, a chain transfer agent may be used as necessary, and the type thereof is not particularly limited. Usually used in the emulsion polymerization of chloroprene, such as n-dodecanethiol, tetra-dodecanethiol and other long-chain alkyl mercaptans, diisobutylxanthine Known chain transfer agents such as dioxane xanthan disulfides such as sulfide and diethylxanthane disulfide, and iodoform can be used. The polymerization inhibitor (polymerization inhibitor) m P (melting point) of the polychloroprene is not particularly limited, and for example, 2,6-tert-butylmonocresol, phenothiazine, hydroxylamine, and the like can be used. (Please read the precautions on the back before filling out this page) ▼ clothing.

This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) -8- 200300155 A7 B7 V. Description of the invention (5) (Please read the precautions on the back before filling this page) The final polychloroprene The polymerization rate is not particularly limited and can be arbitrarily adjusted. Unreacted monomer is removed according to the operation of removing the monomer. The method is not particularly limited. The polychloroprene-based latex of the present invention is obtained by polymerization. By concentrating the polychloroprene-based latex or diluting it with the addition of water or the like, the concentration of the solid content can be controlled to a necessary concentration. The concentration method is not particularly limited as long as it is concentrated under reduced pressure. The properties of the polychloroprene-based latex of the present invention are not particularly limited, and the polymerization temperature, polymerization initiator, chain transfer agent, polymerization inhibitor, final polymerization rate, demonomerization, and concentration conditions are appropriately selected because To control, it is possible to adjust the solid content concentration, the molecular weight of the toluene-soluble portion, and the toluene-insoluble component (gel content). The Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs prints the gel content of chloroprene (co) polymer in polychloroprene-based latex from the balance between initial adhesion and normal adhesion. It is ideal to be 3 to 60% by weight, and the gel content is as required. A polychloroprene-based latex sample was freeze-dried, and A was prepared by a fine scale. Dissolve in toluene (prepared at 0.6%), use a telecentric separator to further separate the gel with a 200 mesh gold mesh, and blow dry the gel components in air at 100 ° C for 1 hour. After the fine scale is made into B, the above-mentioned A and B are calculated using the sequential formula to calculate the gel content. Gel content (%) = B / Ax100 sodium oxalate * The general formula is expressed as Na2O · nS i 02 · ιπΗ2〇, and the molar ratio of Na 2 0 to S 10 2 is also That is, according to the coefficient η, it can be divided into ortho-sodium silicate, meta-sodium silicate, sodium silicate No. 1, sodium silicate No. 2, and silicate. 297 mm) -9-200300155 A7 B7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (6) Sodium No. 3, Sodium Silicate No. 4, etc. In the present invention, in particular, ortho-sodium silicate, The use of ortho-sodium silicate, as indicated in the postscript examples, has an excellent effect on the point of adhesion compared to other sodium silicate. The content of ortho-sodium silicate in the polychloroprene-based latex of the present invention is not particularly specified, but from the point of adhesive strength, the range of 100 parts by weight (solid content) of polychloroprene, It is preferably 0.1 to 30 parts by weight, and more preferably 1 to 15 parts by weight. In the polychloroprene-based latex composition of the present invention, sufficient adhesion can be found in its original state. Since it contains polyethyleneimine, the effect can be further enhanced. The content of polyethyleneimine is polychloroprene The mass fraction of the latex 100 (solid content conversion) is preferably from 0.1 to 5 parts by weight (solid content conversion), and particularly preferably from 0.5 to 3 parts by weight. The polyethyleneimine used in the present invention is a polymer having the following general formula, and the synthesis method is not particularly limited. Generally, it can be synthesized by ring-opening polymerization of ethyleneimine. The general formula X, It is desirable that the average molecular weight of the y polymer is 1 000 or more, and it is particularly desirable to select a state in which the y polymer is 1 000 or more. H2N- (CH2-CH2-y) x- (CH2-CH2-AT) y. CH2-CH2-N < Also the polychloroprene-based latex composition of the present invention. The addition of the adhesion-imparting resin can balance the practical use due to characteristics such as initial adhesion, water-resistant adhesion, and adhesion holding time. The type of the adhesion-imparting resin compounded with the water-based adhesive is not particularly limited. In order to obtain a very good initial adhesion, the softening point temperature is 50. This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297). Second-(Please read the precautions on the back before filling this page) k · Order

200300155 A7 B7 V. Description of the invention (7) (Please read the precautions on the back before filling in this page) ~ 16 ° C resin is ideal, and specifically, rosin resin, polymerized rosin resin, α-pinene can be recommended. Resin, / 3-pinene resin, terpene phenol resin, carbon 5 fraction petroleum resin, carbon 9 fraction petroleum resin, carbon 5 / carbon 9 fraction petroleum resin, d CPD petroleum resin, alkylphenol resin, Toluene resin, coumarone resin, coumarone indene resin, and the like. Among them, rosin resin is also preferable.

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The compounding amount of the adhesion-imparting resin is preferably a polychloroprene-based latex 100 mass portion (solid content conversion) to 1 to 80 parts by weight (solid content conversion). Particularly preferred is a suitable 5 to 50 parts by weight. The method of blending the tack-imparting resin is not particularly limited. In order to disperse the resin uniformly in the latex, it is desirable to add an aqueous latex. The method for preparing an adhesive resin-provided water-based latex is to remove organic matter such as toluene, emulsify / disperse the dissolved substance with an emulsifier in water, and remove the organic solvent by heating while reducing the pressure of the organic solvent. Crushing, emulsifying / dispersing methods, etc., are ideal because the former can be made from fine particle emulsions. The solid content concentration of the polychloroprene-based latex composition of the present invention is not particularly limited, and it is preferably 70% by weight or less so as not to lose the stability of the emulsion system. Furthermore, the polychloroprene-based latex composition of the present invention is used. When each is used as an aqueous adhesive, it is preferably 40 to 70% by weight, and when used as an aqueous heuristic, it is ideal to be 10 to 40% by weight. It is more appropriate to adjust the solid content concentration . The adjustment of such a solid content can be carried out optionally by diluting it with pure water or concentrating it by removing water. The solid content concentration of the polychloroprene-based latex of the present invention can be obtained by the following operations. Only weigh aluminum dish to get A, put 2 ml of latex sample into lead dish and weigh -11-This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) 200300155 A7 B7 Employees ’Cooperative of Intellectual Property Bureau, Ministry of Economic Affairs 5. The description of the invention (8) B is printed. The latex sample is placed in a lead dish and dried under air at 110 ° C for 2 hours, and then measured to obtain C. The solid content concentration (% by weight) was calculated by the following formula. Solid content concentration (%) = [(CA) / (BA)] X 100. Regarding the polychloroprene-based latex composition of the present invention as well as the required performance in addition to the above, a tackifier, metal can be added arbitrarily. Oxides, fillers, film-forming aids, ultraviolet absorbers, oxidation inhibitors, plasticizers, vulcanizing agents, vulcanization accelerators, defoamers, etc. The polychloroprene-based latex composition of the present invention may be adjusted at an arbitrary viscosity by blending a thickener. Specific tackifiers can be mentioned as polyvinyl alcohol (PVA), sodium polyacrylate, water-soluble polyurethane, meeting polyurethane-based latex, alkali-swelling propylene-based latex carboxymethyl cellulose (CMC), methyl fiber (MC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), polyvinyl alcohol, synthetic montmorillonite, etc. The blending amount of the tackifier is polychloroprene-based latex 1 0 0 The mass portion (solid content conversion) is suitable for 0 · 1 to 10 mass portion (solid content conversion). Mixing within this range has no adverse effect on the physical properties of the adhesive. It is possible to adjust the viscosity of the polychloroprene-based latex composition. The rubber, elastomer, synthetic resin, etc. to which the polychloroprene-based latex composition of the present invention is applied are not particularly limited, and specifically, butadiene rubber (BR), chloroprene rubber (CR), Natural rubber (NR), isoprene rubber (IR), styrene-butadiene rubber (SBR), butyl rubber (IIR), raw spinene rubber (NOR), nitro rubber (NBR), hydrogenated nitrate Rubber (HNBR), bromobutyl (please read the precautions on the back before filling this page). Order

This paper size applies Chinese National Standard (CNS) A4 specification (210X 297 mm) -12- 200300155 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (9) Rubber (BIIR), chlorinated butyl Vulcanized rubber such as rubber (CIIR), acrylonitrile-isoprene rubber (NIR), ethylene propylene diene rubber (EPDM), styrene-butadiene-styrene • block copolymer (SBS), polyester, urine Ethane-based, olefin-based elastomers, chlorinated vinyl resin (PVC), ethyl-vinyl acetate copolymer (EVA), 1,2-polybutadiene (RB), polyolefin resin, styrene Shuyuezhi, acrylonitrile-butadiene-styrene copolymer (AB S), and the like are exemplified. In addition, the composition, cross-linking density, shape, and the like of these materials are not particularly limited, and even a foam may be applicable. Regarding the use, it is also used for sports products, such as clamps, boot soles, and building materials. It can be used in any range. EXAMPLES The effects of the present invention will be described in detail in the following examples and comparative examples. These examples are not limited to the present invention, and the following description does not have an interruption limit. Parts and% are expressed on a weight basis. [Synthesis Example 1] Using a 3 liter reactor, 100 small portions were added under nitrogen flow, 5 pieces of heterogeneous rose block acid, 0.6 portions of sodium hydroxide, and 0.7 portions of potassium hydroxide were formed. 0.3 parts of the sodium salt of the acid condensate, 0.3 parts of sodium bisulfite, and 100 parts of chloroprene monomer and n-dodecanethiol 0.1 part after being dissolved, while stirring. . Use potassium persulfate as a starter. Polymerize at 10 ° C under nitrogen, and add phenothiazine when the polymerization rate reaches 90% (please read the precautions on the back before filling this page) ▼

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This paper size applies Chinese National Standard (CNS) A4 specification (21〇 × 29 * 7mm) -13- 200300155 A7 B7 V. Description of the invention (10) Emulsion and stop polymerization, remove unreacted monomer under reduced pressure And polychloroprene latex was obtained. The water was evaporated and concentrated under reduced pressure, and the solid content was adjusted to 50% by mass. [Example 1] A terpene phenol resin latex using a polychloroprene latex and a polychloroprene latex obtained in Synthesis Example 1 having a solid content concentration of 53% by resin was added to 100 parts of the polychloroprene latex. E-100 (made by Arakawa Chemical Industry Co., Ltd.) 50 parts, 3 parts of sodium orthosilicate solution (manufactured by Asahi Denka Kogyo Co., Ltd.) with a solid content of 30% are added, and pure water is further added to adjust the complex composition. Solid content to 20% as a water-based primer. In addition, a terpene phenol resin latex pallet E-100 (made by Arakawa Chemical Industry Co., Ltd.) with a solid content concentration of 53% of 100 parts of the polychloroprene latex obtained in Synthesis Example 1 for adhesion to the resin (50) Part, sodium polyacrylate aqueous solution thickener (Yaron A-2 0 L / manufactured by Toa Kosei Co., Ltd.) 2. Part 0, hydration powder for powder (Akiro η-4 2 M / Showa Denko Corporation) (Production) 10 parts, 2 parts of a lead oxide dispersion with a solid content concentration of 50% as an oxidant, 2 parts of a water-dispersible isocyanate compound (iron grid WD-7 3 0 / manufactured by Mitsui Takeda Chemical Co., Ltd.) as a hardener After mixing, it acts as a water-based adhesive. After the adhesive surface is polished (surface honing), it is washed with acetone to remove the sediment, and the surface is made of vulcanized styrene butadiene rubber (vulcanized SBR, the size of the paste part is 20mm wide and 70mm long). The water-based primer obtained in Example 1 was gently wiped with gauze. The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page) Order ^ % · Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economy -14-200300155 Α7 Β7 V. Description of the invention (u) Dry at 60 ° C for 10 minutes with water-based adhesive 2 0 g (wet) / M 2 was applied with a brush and dried under air at 60 ° C. for 6 minutes, followed by lamination with a manual roller, and the following evaluation was performed on the test piece obtained by this method. [Initial adhesion evaluation test] T-peel strength was measured from a tensile tester at a tensile speed of 2000 m m / m i η after 10 minutes of pressing. [Normal Adhesion Evaluation Test] One day after the pressing, a tensile tester was used to measure the peeling strength at a tensile speed of 20 (3 mm / min, T type.) [Example 2] Example 1 Prior to the addition of pure water, the prepared primer was added with 3.3 parts of polyethyleneimine (epoxy P-1000 (30% solids) / Made by Usmoto Catalysts Co., Ltd.), followed by pure Except for water-adjusted solid content of $ 20%, the same test as in Example 1 was performed as Example 2 ° [Comparative Example 1] The same test as in Example 1 was performed as Comparative Example 1 except that no water-based primer was used. 〔Comparative Example 2〕 (Please read the precautions on the back before filling in this page)-, _ Ding

Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, the paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) -15- ---- ^ 200300155 A7 B7 V. Description of the invention (12) Do not use orthosilicic acid Except for sodium, the same test as in Example 1 was performed as Comparative Example 2. (Please read the precautions on the back before filling in this page) [Comparative Examples 3 to 5] Use other types of sodium silicate instead of sodium orthosilicate 'to perform the same test as in Example 1 as Comparative Examples 3 to 5. [Comparative Example 6] The same test as in Example 1 was performed as a comparative example 6 except that the solvent-based primer was used instead of the water-based primer. The solvent-based primer here is the same as before. In a 3 liter reactor, add 120 parts of water under nitrogen flow, 4 parts of heterogeneous rose acid, 0. 8 parts of sodium hydroxide, 0-5 parts of sodium salt of formaldehyde naphthalenesulfonic acid condensate, sulfurous acid 0,3 parts of sodium hydrogen hydride, while stirring, add 100 parts of chloroprene monomer and n-dodecanethiol, Ministry of Economic Affairs, Intellectual Property Bureau, Employee Consumption Cooperative, and print 0.5 parts. Potassium persulfate was used as the starting agent, under 10 under nitrogen. (: Polymerization. When the polymerization rate reaches 70%, an emulsion of phenothiazine is added and the polymerization is stopped. After removing unreacted monomers under reduced pressure, polychloroprene is obtained by a conventional freeze-drying method. Take 100 g of the obtained polychloroprene wafer, put it into a 1-liter reactor, add 600 g of toluene and dissolve while stirring. Add 50 g of methacrylate after dissolving, Phenylhydrazine peroxide was used as the initiator. Graft polymerization was carried out at 85 ° C for 5 hours. The polymerization reaction was stopped when a toluene solution of 2,6-di-t-butyl-4-cresol was added. Further, toluene was used. Dilution meets the solid content concentration of 5% to make the dissolved paper. The size of the paper is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 200300155 A7 B7 V. Description of the invention (13 Dosage Primer Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs (Please read the notes on the back before filling out this page)

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Claims (1)

200300155 Printed by A8, B8, C8, D8, Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 6. Application for patent scope 1 1. A polychloroprene latex composition 'characterized by using polychloroprene and sodium orthosilicate as Essential ingredients, they can be dispersed or dissolved in water. 2. The polychloroprene-based latex composition according to item 1 of the scope of the patent application, wherein the solid content concentration in the polychloroprene-based latex is 40 to 70% by weight. 3. The polychloroprene-based latex composition as described in item 1 or 2 of the scope of patent application, wherein the content of sodium orthosilicate is 0.1 to 100 parts by weight of polychloroprene (solid content). ~ 30 parts by weight. 4. The polychloroprene-based latex composition according to any one of items 1 to 3 in the scope of the patent application, in which 100 parts by weight of polyethyleneimine to polychloroprene (solid content) contains 0.1 to 1 5 parts by weight. 5. The polychloroprene-based latex composition according to any one of claims 1 to 4 in the scope of the patent application, wherein the adhesion-imparting resin contains polychloroprene (solid content) in an amount of 100 parts by weight. 1 to 80 parts by weight. 6. The polychloroprene-based latex composition according to any one of items 1 to 5 in the scope of the patent application, wherein the tackifier contains 0.01 to 10 parts by weight of 100 parts by weight of the polychloroprene (solid content). Parts by weight. 7 · A water-based primer characterized by using a polychloroprene-based latex composition as described in any one of claims 1 to 6 in the application scope as a main component. 0 ·· An adhesion method characterized by The water-based primer described in item 7 of the scope of patent application is adhered to the adhered layer. ^^ Equipment-(Please read the precautions on the back before filling this page), 11 This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -19 _ 200300155 Lu, (10) The designated representative figure in this case is: None (two), the component representative symbol of this representative figure is simply explained: None 2. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: None