JP5749757B2 - Polychloroprene latex composition and adhesive - Google Patents

Description

The present invention relates to a polychloroprene latex composition and an adhesive using the same.

As a method for improving the light discoloration resistance of the polychloroprene latex composition, means described in Patent Documents 1 and 2 are known.
As a method for improving the heat discoloration resistance and light discoloration resistance of the polychloroprene latex composition, the means described in Patent Document 3 is known.

JP 2000-86821 A JP-A-11-209523 JP-A-9-157334

The present invention provides a polychloroprene latex composition excellent in light discoloration resistance and heat discoloration resistance and an adhesive using the same.

The present invention includes a polychloroprene latex in terms of solid content 100 parts by mass, 2,2'-methylenebis (6-nonyl -p- cresol) der Ru bisphenol compound (hereinafter, referred to as Compound A) 0.1 to 20 parts by weight It is a polychloroprene latex composition to be contained.

“100 parts by mass in terms of solid content of polychloroprene latex” refers to the mass of solid content contained in the polychloroprene latex. That is, the amount obtained by multiplying the mass of the polychloroprene latex by the solid content concentration is 100 (parts by mass).

Compound A is 2,2′-methylenebis (6-nonyl-p-cresol) .
The polychloroprene latex composition may contain 0.25 to 7.5 parts by mass of a phenolic antioxidant excluding Compound A and 0.15 to 3.0 parts by mass of a benzotriazole-based ultraviolet absorber. preferable.
The polychloroprene latex composition can be used as an adhesive as it is. Moreover, it is good also as an adhesive agent which contained 10-100 mass parts of tackifying resin per 100 mass parts of polychloroprene latex compositions.

According to the present invention, a polychloroprene latex composition excellent in light discoloration resistance and heat discoloration resistance and an adhesive using the same can be obtained.

The polychloroprene latex composition of the present invention contains (1) polychloroprene latex and (2) compound A.

(1) Polychloroprene Latex Polychloroprene latex is a copolymer of latex or chloroprene having a homopolymer of 2-chloro-1,3-butadiene (hereinafter referred to as chloroprene) as a main component and a monomer copolymerizable therewith. A latex mainly composed of a polymer.
Monomers copolymerizable with chloroprene include 2,3-dichloro-1,3-butadiene, 1-chloro-1,3-butadiene, butadiene, isoprene, styrene, acrylonitrile, carboxyl group-containing vinyl monomers and There are esters. Two or more of these monomers can be used. Among these monomers, it is preferable to use a carboxyl group-containing vinyl monomer because the polymerization reaction can be easily controlled.

Examples of the carboxyl group-containing vinyl monomer include methacrylic acid, acrylic acid, crotonic acid, fumaric acid, maleic acid, and citraconic acid. Two or more kinds of these carboxyl group-containing vinyl monomers can be used. Among these monomers, use of methacrylic acid (also referred to as 2-methylpropenoic acid or α-methylacrylic acid) is preferable because it is easy to control the emulsion copolymerization. By copolymerizing these monomers, a polychloroprene latex having a carboxyl group introduced into the polymer chain of polychloroprene can be obtained. When the obtained polychloroprene latex is used as an adhesive, normal adhesive strength, water-resistant adhesive strength, and heat-resistant adhesive strength can be improved by combination with various crosslinking agents.

When a carboxyl group-containing vinyl monomer is used as a monomer copolymerizable with chloroprene, the charged amount during the polymerization is 0% of the carboxyl group-containing vinyl monomer out of 100 parts by mass of all monomers to be polymerized. It is preferable to adjust so that it may become 0.01-10 mass parts. When the carboxyl group-containing vinyl monomer is less than 0.01 parts by mass, crosslinking reactivity with various crosslinking agents is difficult to expect, and when the carboxyl group-containing vinyl monomer exceeds 10 parts by mass, a crosslinking agent is added. The pot life may be shortened.

In order to obtain polychloroprene latex, these monomers are subjected to emulsion polymerization in the presence of water and an emulsifier, a polymerization catalyst, a chain transfer agent and other additives generally used in the polymerization of chloroprene, and then the polymerization is stopped. What is necessary is just to stop superposition | polymerization by adding an agent and to remove an unreacted monomer.

The polymerization conditions of the monomers are not particularly limited, and by appropriately selecting and controlling the polymerization temperature, polymerization catalyst, chain transfer agent, polymerization terminator, final polymerization rate, demonomer and concentration conditions, It is possible to adjust the solid content concentration, the molecular weight of the toluene soluble part, the toluene insoluble content (gel content), and the like.

The polychloroprene latex can be adjusted by concentration under reduced pressure or by adding water and diluting to adjust the solid content concentration.
The solid content concentration of the polychloroprene latex is not particularly limited, but is preferably adjusted to a range of 40 to 65% by mass in consideration of the drying rate and storage stability of the adhesive.

The polychloroprene latex can improve the balance between the initial adhesive force and the normal adhesive force of an adhesive using the same by adjusting the toluene insoluble content (gel content) to 5 to 70% by mass. When the toluene insoluble content is lower than 5% by mass, the normal adhesive strength of the obtained adhesive is insufficient, whereas when it exceeds 70% by mass, the initial adhesive strength may be insufficient.

(2) Compound A
Compound A is added in order to improve the light discoloration resistance and heat discoloration resistance of the resulting polychloroprene latex composition. Compound A is 2,2′-methylenebis (6-nonyl-p-cresol) .

Examples of the alkylidene bisphenol compounds include 4,4′-butylidenebis (2-t-butyl-5-methylphenol), 4,4′-butylidenebis (2-t-butyl-5-ethylphenol), 4,4′- There are butylidenebis (2-t-butyl-5-propylphenol) and 4,4′-propylidenebis (2-t-butyl-5-methylphenol).

Examples of the alkylene biscresol compound include 2,2′-methylenebis (6-nonyl-p-cresol), 2,2′-methylenebis (6-hexyl-p-cresol), 2,2′-ethylenebis (6- Hexyl-p-cresol), 2,2'-ethylenebis (6-nonyl-p-cresol).

Examples of the thiobisphenol compound include 4,4'-thiobis- (3-methyl-6-t-butylphenol) and 4,4'-thiobis- (3-ethyl-6-t-butylphenol).

Examples of the alkylene bisphenol compounds include 2,2′-methylene bis (4-ethyl-6-tert-butylphenol), 2,2′-ethylene bis (4-propyl-6-tert-butylphenol), and 2,2′-propylene. There is bis (4-propyl-6-tert-butylphenol).
Two or more kinds of these bisphenol compounds can be used.

Among these compounds, when 2,2′-methylenebis (6-nonyl-p-cresol), which is an alkylene biscresol compound, is used, the effect of improving the light discoloration resistance and heat discoloration resistance of the resulting polychloroprene latex is large. Therefore, it is preferable.

The addition amount of the compound A is 0.1-20 mass parts in 100 mass parts conversion of polychloroprene latex solid content. When the amount of compound A added is less than 0.1 parts by mass, the light discoloration resistance and heat discoloration resistance of the resulting polychloroprene latex composition cannot be improved. When the addition amount of compound A exceeds 20 mass parts, the adhesive strength of the obtained polychloroprene latex composition and an adhesive agent falls.

The method for adding compound A to the polychloroprene latex is not particularly limited. When compound A is solid, compound A may be added after being pulverized into fine particles, or compound A may be added after forming an aqueous emulsion. Among these methods, it is preferable to use the method of adding after forming an aqueous emulsion because of the effect of improving the storage stability of the resulting polychloroprene latex composition.
In order to add the compound A to the polychloroprene latex after making it into an aqueous emulsion, the following procedure may be used. Compound A is dissolved in an organic solvent such as toluene, and an emulsifier and water are further added to obtain an aqueous emulsion of Compound A. The obtained aqueous emulsion of Compound A is added to the polychloroprene latex and then heated under reduced pressure to remove the organic solvent.

The polychloroprene latex can be further improved in light discoloration resistance and heat discoloration resistance by adding (3) a phenolic antioxidant excluding Compound A and (4) a benzotriazole ultraviolet absorber.

(3) Phenolic antioxidants excluding compound A As phenolic antioxidants excluding compound A, alkylphenol compounds, benzylphenol compounds, alkylphenyl acrylate compounds, alkylpropionates compounds, alkylhydroxyphosphonate diesters Compounds and alkylhydroquinone compounds.

Examples of the alkylphenol compounds include 2,6-di-t-butyl-4-methylphenol and 2,6-di-t-butyl-4-ethylphenol.

Benzylphenol compounds include mono (or di or tri) (α-methyl-benzyl) phenol.

Benzylphenyl acrylate compounds include 2-t-butyl-6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2- [1- (2-hydroxy-3 , 5-di-t-pentylphenyl) ethyl] -4,6-di-t-pentylphenyl acrylate.

Alkylpropionate compounds include n-octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, tetrakis [methylene-3- (3,5-di-t-butyl- 4-hydroxyphenyl) propionate] methane, n-octadecyl-3- (4-hydroxy-3,5-di-t-butylpheni) propionate.

Examples of alkylhydroxyphosphonate diester compounds include 3,5-di-t-butyl-4-hydroxy-benzylphosphonate-diethyl ester, isooctyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate There is.

Examples of the alkyl hydroquinone compounds include 2,5-di-t-butyl hydroquinone and 2,5-di-t-amyl hydroquinone.
Two or more phenolic antioxidants excluding these compounds A can be used.

The addition amount of the phenolic antioxidant excluding the compound A is preferably 0.25 to 7.5 parts by mass, more preferably 1.0 to 6.5 parts by mass based on 100 parts by mass in terms of polychloroprene latex solid content. . By adjusting to this range, the effect of improving light discoloration resistance and heat discoloration resistance is great.

(4) Benzotriazole ultraviolet absorbers Examples of benzotriazole ultraviolet absorbers include alkylhydroxyphenylbenzotriazole compounds, alkylchlorobenzotriazole compounds, alkylhydroxychlorobenzotriazole compounds, and diamylbenzotriazole compounds.

Examples of the alkylhydroxyphenylbenzotriazole compounds include 2- (5-methyl-2-hydroxyphenylbenzotriazole, 2- [2-hydroxy-3,5-bis (α, αdimethylbenzyl) phenyl] -2H-benzotriazole. 2- (3,5-di-t-butyl-2-hydroxyphenyl) benzotriazole.

Examples of the alkyl chlorobenzotriazole compounds include 2 (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole.

Examples of the alkylhydroxychlorobenzotriazole compounds include 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-t-butyl-2- Hydroxyphenyl) -5-chlorobenzotriazole.

Examples of diamylbenzotriazole compounds include 2- (3,5-di-t-amyl-2-hydroxyphenyl) benzotriazole.
Two or more kinds of these benzotriazole-based ultraviolet absorbers may be used in combination.

The amount of the benzotriazole-based ultraviolet absorber added is preferably 0.15 to 3.0 parts by mass, more preferably 0.2 to 2.0 parts by mass, based on 100 parts by mass in terms of solid content of polychloroprene latex. By adjusting to this range, the effect of improving light discoloration resistance and heat discoloration resistance is great.

The addition method to the polychloroprene latex of the phenolic antioxidant and the benzotriazole ultraviolet absorber except for the compound A is not particularly limited. When these compounds are solid, as in the case of Compound A, these compounds may be added after being pulverized into fine particles, or these compounds may be added after forming an aqueous emulsion. Among these methods, it is preferable to use the method of adding after forming an aqueous emulsion because of the effect of improving the storage stability of the resulting polychloroprene latex composition. In order to make these compounds into aqueous emulsions, the same method as that in which compound A is made into an aqueous emulsion may be used.

The polychloroprene latex composition has a thickener, a filler, a film-forming aid, an ultraviolet absorber, an antioxidant, a plasticizer, a vulcanizing agent, a vulcanization accelerator, Foaming agents, antibacterial agents, antifungal agents, acid acceptors and the like can be added.

The adhesive of the present invention contains the above-described polychloroprene latex composition. The polychloroprene latex composition can be used as an adhesive as it is. Moreover, it is good also as an adhesive agent by adding tackifying resin to a polychloroprene latex composition.

When the tackifying resin is added to the polychloroprene latex composition to form an adhesive, the addition amount of the tackifying resin is preferably 10 to 100 parts by mass in 100 parts by mass in terms of polychloroprene latex solid content. By adjusting to this range, a sufficient normal adhesive force can be maintained. The tackifier resin referred to herein, rosin resin, polymerized rosin resin, alpha-pinene resins, beta-pinene resins, terpene phenol resins, C ₅ fraction petroleum resin, C ₉ fraction petroleum resin, C 5 _/ C _{There are nine} fraction petroleum resins, DCPD petroleum resins, alkylphenol resins, xylene resins, coumarone resins, coumarone indene resins and the like.

When adding a tackifying resin to the polychloroprene latex composition, there are a method of adding the tackifying resin by simply pulverizing it into fine particles and a method of adding the tackifying resin after making it into an aqueous emulsion. In order to uniformly disperse the tackifying resin in the adhesive, it is preferable to add it as an aqueous emulsion. In order to make the tackifier resin into an aqueous emulsion, the same method as that in which the compound A is made into an aqueous emulsion may be used.

Adhesives are thickeners, fillers, vulcanization accelerators, crosslinking agents, film-forming aids, UV absorbers, antioxidants, plasticizers, antifoaming agents, antibacterial agents, as long as the effects of the present invention are not impaired. Agents, fungicides, etc. can be added.

The thickener is added to adjust the viscosity of the resulting adhesive. Thickeners include sodium polyacrylate, water-soluble polyurethane, associative polyurethane emulsion, alkali swelling acrylic emulsion, carboxymethylcellulose (CMC), methylcellulose (MC), hydroxyethylcellulose (HEC), hydroxypropylcellulose (HPC) ) And synthetic smectite.

The filler is added to reduce the product cost of the resulting adhesive. Examples of the filler include calcium carbonate, aluminum hydroxide, titanium oxide, barium sulfate, and synthetic silica. As a film-forming auxiliary, propylene glycol, n-butyl ether, dipropylene glycol, tripropylene glycol, 2,2,4-trimethyl-1,3-pentadiol monoisobutyrate, 2,2,4-trimethyl-1 , 3-pentadiol diisobutyrate.

The vulcanization accelerator is added to improve the normal adhesive strength of the obtained adhesive. Examples of the vulcanization accelerator include dithiocarbamate, xanthogen, thiuram, aldehyde ammonia, thiourea, thiazole, sulfenamide, and guanidine.

Examples of dithiocarbamate salts include pentamethylenedithiocarbamate piperidine salt, pipecolyldithiocarbamate pipecoline salt, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, zinc dibutyldithiocarbamate, zinc N-ethyl-N-phenyldithiocarbamate, There are zinc N-pentamethylenedithiocarbamate, zinc dibenzyldithiocarbamate, sodium diethyldithiocarbamate, sodium dibutyldithiocarbamate, copper dimethyldithiocarbamate, ferric dimethyldithiocarbamate, and tellurium diethyldithiocarbamate.

Examples of xanthates include zinc butylxanthate and zinc isopropylxanthate.

Examples of the thiuram type include tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, tetrakis (2-ethylhexyl) thiuram disulfide, tetramethylthiuram monosulfide, and dipentamethylenethiuram tetrasulfide.

As the aldehyde ammonia type, there is hexamethylenetetramine.
Examples of the thiourea series include N, N′-diphenylthiourea, trimethylthiourea, and N, N′-diethylthiourea.

Examples of thiazole compounds include 2-mercaptobenzothiazole, dibenzothiazyl sulfide, 2-mercaptobenzothiazole zinc salt, cyclohexylamine salt of 2-mercaptobenzothiazole, and 2- (N, N-diethylthiocarbamoylthio) benzothiazole. 2- (4′-morpholinodithio) benzothiazole.

Examples of sulfenamide-based compounds include N-cyclohexyl-2-benzothiazolylsulfenamide, Nt-butyl-2-benzothiazolylsulfenamide, N-oxydiethylene-2-benzothiazolylsulfenamide N, N-dicyclohexyl-2-benzothiazolylsulfenamide.

Examples of guanidine-based compounds include 1,3-diphenylguanidine, di-o-tolylguanidine, 1-o-tolylbiguanide, dicatechol borate di-o-tolylguanidine.

A crosslinking agent is added in order to improve the normal adhesive strength of the adhesive agent obtained. As a crosslinking agent, a compound having a methylol group such as a melamine resin, a compound having an epoxy group such as an epoxy resin, a compound having an isocyanate group such as a blocked isocyanate compound or a water-dispersed isocyanate compound (isocyanate compound), or an oxazoline group There are compounds, compounds such as phenol resins and glycols, compounds having two or more hydroxyl groups in the molecule, and compounds having an imino group (imine compounds).

Among these compounds, isocyanate compounds not only bind to the chloroprene polymer and emulsifier hydroxyl groups and carboxyl groups in polychloroprene latex, but also react with water to produce isocyanate derivatives. And heat resistant adhesive strength can be greatly improved. The water-dispersed isocyanate compound is obtained by introducing a hydrophilic group into a polyisocyanate polymer having a structure such as burette, isocyanurate, urethane, uretdione, or allophanate obtained from an aliphatic isocyanate or alicyclic isocyanate. . That is, it is a self-emulsifying isocyanate compound that can be dispersed as fine particles in water when added and stirred in water.

Examples of the aliphatic isocyanate and alicyclic isocyanate include tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate, lysine diisocyanate (LDI), isophorone diisocyanate (IPDI), hydrogenated xylylene diisocyanate (water). XDI), tolylene diisocyanate (TDI), 4,4'-diphenylmethane diisocyanate (MDI), polymerized MDI, xylylene diisocyanate (XDI), naphthylene diisocyanate (NDI), paraphenylene diisocyanate (PPDI), tetramethylxylylene diene Isocyanate (TMXDI), dicyclohexylmethane diisocyanate (HMDI), isopropylidenebi (4-cyclohexyl isocyanate) (IPC), cyclohexyl diisocyanate (CHPI), tolidine diisocyanate (TODI). Among these compounds, HDI, MDI, IPDI, and hydrogenated XDI are preferable because they are easily available industrially. The effect of the isocyanate compound as a crosslinking agent depends on the isocyanate group content calculated by the method defined in JIS K-7301 rather than the raw material compound. In order to obtain good adhesive strength, the isocyanate group content of the water-dispersed isocyanate compound used is preferably 17 to 25% by mass.

The conditions for using the adhesive are not particularly limited. Substrates include wood, concrete, ceramics, fabrics (knitted and non-woven fabrics such as nylon, polyester, and cotton), natural leather (cowhide, kangaroo leather, etc.), artificial leather (polyurethane, polyvinyl chloride resin, etc.), It can be used for the same or different adhesion of vulcanized rubber (SBR, BR, CR) and resin (non-foamed material or foamed material such as polyurethane and EVA).

The method and apparatus specifications for applying the adhesive are not particularly limited. Specifically, there are a curtain flow coater method, a bar coater method, and a roll coater method, and the roll coater method includes a gravure roll coater method and a reverse gravure roll coater method.

<Manufacture of polychloroprene latex>
In a reactor having an internal volume of 10 liters, in a nitrogen atmosphere, 100 parts by mass of water, 4 parts by mass of sodium salt of rosin acid, 0.8 part by mass of potassium hydroxide, sodium salt of formaldehyde naphthalenesulfonic acid condensate 0.3 First, 100 parts by mass of chloroprene monomer and 0.14 parts by mass of n-dodecyl mercaptan were added while stirring, after charging parts by mass and 0.3 part by mass of sodium sulfite. Using 0.1 parts by mass of potassium persulfate as a polymerization initiator, polymerization was performed at 10 ° C. in a nitrogen atmosphere. When the final polymerization rate reached 87%, an emulsion of phenothiazine was added to terminate the polymerization. After removing the unreacted monomer under reduced pressure, it was concentrated by heating under reduced pressure to obtain a polychloroprene latex having a solid concentration of 55% by mass and a gel content of 29% by mass. The solid content concentration and gel content of the polychloroprene latex were measured by the following methods.

Solid content concentration Solid content concentration (%) was determined by the following equation. In the formula, A is the weighed value of an empty aluminum dish, B is the weighed value when 2 ml of polychloroprene latex is placed in the aluminum dish, and C is the aluminum dish containing polychloroprene latex that is dried at 110 ° C. for 2 hours. It is a weighed value after being made.
Solid content concentration (%) = {(C−A) / (B−A)} × 100

Gel content Gel content (%) was calculated | required by the following formula | equation. In the formula, A is a weighed value of polychloroprene rubber obtained by freeze-drying 20 g of polychloroprene latex, and B is 20 hours at 23 ° C. using toluene so that the polychloroprene rubber has a concentration of 0.6 wt%. Dissolve the resulting polychloroprene rubber in toluene solution using a centrifuge to precipitate the gel content, then collect the gel content using a 200 mesh wire mesh and collect the recovered gel content for 2 hours. It is a weighed value of a gel content (component insoluble in toluene) after being dried naturally and further dried at 110 ° C. for 1 hour.
Gel content (%) = (B / A) × 100

Example 1
<Production of polychloroprene latex composition>
To 100 parts by mass of the polychloroprene latex obtained by the above-mentioned method, 2 parts by mass of 2,2′-methylenebis (6-nonyl-p-cresol) is added as compound A, and stirred at 600 rpm for 30 minutes with a three-one motor. Thus, a polychloroprene latex composition was obtained. 4,4′-Butylidenebis (2-t-butyl-5-methylphenol) was pulverized into fine particles using a ball mill (pulverizer) and mixed with an emulsifier and water to obtain a 50% by mass aqueous dispersion. A thing was used.

<Evaluation of polychloroprene latex composition>
The polychloroprene latex composition obtained by the above method was evaluated for (1) light discoloration resistance and (2) heat discoloration resistance by the following methods. The evaluation results are shown in Table 1.

(1) Light discoloration resistance The light discoloration resistance test was carried out by applying the obtained polychloroprene latex composition to blotting paper shim-1 (manufactured by KOKUYO Co., Ltd.) at 200 g / m ² using a brush at 3 ° C. After drying for a period of time, change in color when irradiated with xenon (wavelength: 340 nm) using a Q-SUN Xe-3 xenon arc tester (Q-Lab Corporation, Q-SUN XE-3-HS) Evaluated. The color change was evaluated by using a multi-light source spectrocolorimeter Multi Spectro Color Meter (manufactured by Suga Test Instruments Co., Ltd.) and using a white ceramic plate (L * = 92.62, a * = 0.14, b *). = 2.95) and the color difference (ΔE) was measured. The value after 8 hours was 30 or less and the value after 24 hours was 56 or less.
(2) Heat discoloration resistance The heat discoloration resistance test was conducted when the obtained polychloroprene latex composition was heat treated at 100 ° C. using a thermostatic gear oven with a rotating frame (GPHH-202, manufactured by ESPEC Corporation). The change in color was measured. The measurement was performed by the same method as the above-mentioned light discoloration resistance. The value after 6 days was 55 or less.

<Manufacture of adhesives>
100 parts by mass of polychloroprene latex obtained by the above-mentioned method, 50 parts by mass of Tamanol E-100 (registered trademark) manufactured by Arakawa Chemical Industries, Ltd. as a tackifier resin, and Osaki Kogyo Co., Ltd. as zinc oxide 1 part by mass of AZ-SW was added and stirred using a three-one motor. RM-8W manufactured by Rohm and Haas was added as a thickener so that the viscosity of this solution was 3000 to 4000 mPa · s at 25 ° C. × 30 rpm to obtain an adhesive.

<Preparation of adhesive evaluation sample>
The adhesive obtained by the above-described method was applied to two 25 × 150 mm canvases with a brush so as to be 300 g (solid content) / m ² . The canvas coated with the adhesive was dried at 80 ° C. for 9 minutes and further allowed to stand at room temperature for 1 minute, and the coated surfaces of the adhesive were bonded together and pressure-bonded with a hand roller to obtain an adhesive evaluation sample.

<Evaluation of adhesive>
About the evaluation sample of the adhesive agent obtained by the above-mentioned method, (3) initial stage peel strength and (4) normal state peel strength were evaluated by the method shown next. The evaluation results are shown in Table 1.

(3) Initial peel strength In the initial peel strength test, the obtained adhesive evaluation sample was allowed to stand at room temperature for 10 minutes, and then the 180 ° peel strength was measured at a pulling rate of 200 mm / min using a tensile tester. A value of 4.2 N / mm or more was accepted.
(4) Normal peel strength The normal peel strength test was conducted by leaving an evaluation sample of the obtained adhesive at room temperature for 7 days and then measuring 180 ° peel strength at a pulling rate of 200 mm / min using a tensile tester. . A value of 6.3 N / mm or more was accepted.

The polychloroprene latex compositions and adhesives in Examples 1 and 2, Reference Examples 1 to 20 and Comparative Examples 1 to 4 were modified by changing the conditions for producing the polychloroprene latex composition as shown below. 1 was produced and evaluated in the same manner as in Example 1.

( Reference Examples 2 and 3)
The polychloroprene latex compositions and adhesives of Reference Examples 2 and 3 were the compound A of Example 1.
The types and amounts added were changed as shown in Table 1.

(Example 2, Reference Examples 4, 5 )
The polychloroprene latex compositions and adhesives of Example 2 and Reference Examples 4 and 5 are obtained by changing the type and addition amount of Compound A of Example 1 as shown in Table 1.

( Reference Examples 6 to 9 )
The polychloroprene latex compositions and adhesives of Reference Examples 6 to 9 were compound A of Example 1.
As shown in Table 1, the type and amount added were changed, and the “phenolic antioxidant excluding Compound A” shown in Table 1 was added.

( Reference Example 1 0 to 15 )
Reference Example 1 0-1 5 polychloroprene latex composition and adhesive, the kind and addition amount of Compound A of Example 1 were changed as shown in Table 2, except for the "Compound A shown in Table 2 A phenolic antioxidant "is added.

(Reference Example 1 6 to 20)
Polychloroprene latex composition and adhesive of Reference Example 1 6 to 20, the kind and amount of Compound A of Example 1 were changed as shown in Table 2, phenol except "Compound A shown in Table 2 "System antioxidant" and "benzotriazole UV absorber".

(Comparative Example 1)
The polychloroprene latex composition and adhesive of Comparative Example 1 were those in which Compound A used in Example 1 was not added.

(Comparative Example 2)
The polychloroprene latex composition and adhesive of Comparative Example 2 are obtained by changing the type and addition amount of Compound A of Example 1 to the amounts shown in Table 3.

(Comparative Examples 3 and 4)
The polychloroprene latex compositions and adhesives of Comparative Examples 3 and 4 are obtained by changing Compound A of Example 1 to bisphenol compounds that are outside the scope of the present invention.

The polychloroprene latex compositions of Examples 1 and 2 using the compound A specified in the present invention were excellent in light discoloration resistance and heat discoloration resistance. Moreover, the adhesives using these polychloroprene latex compositions were also excellent in their adhesive properties.
On the other hand, in Reference Examples 1 to 20 and Comparative Examples 1 to 4 in which the amount and type of Compound A are outside the scope of the present invention, a polychloroprene latex composition excellent in light discoloration resistance and heat discoloration resistance cannot be obtained. The adhesive strength was inferior.

Claims (2)

And polychloroprene latex in terms of solid content 100 parts by mass, 2,2'-methylenebis (6-nonyl -p- cresol) der Ru bisphenol compound 0.1 to 20 parts by weight polychloroprene latex composition containing. An adhesive comprising 100 parts by mass of the polychloroprene latex composition according to claim 1 and 10 to 100 parts by mass of a tackifying resin.