A CONTAINER FOR, AND A PACKAGING INCLUDING, CYANOACRYLATE COMPOSITION(S).

Abstract

A container for a curable cyanoacrylate composition comprising: a reservoir for containing the curable cyanoacrylate composition, wherein the reservoir has an outlet through which the curable cyanoacrylate composition can be dispensed; the reservoir is defined by walls of plastic material, the plastic material being formed from a polymeric material that is transmissive to both visible and ultraviolet light; and a UV-blocking agent dispersed in the plastic material, wherein the UV-blocking agent comprises at least one benzotriazole; wherein the walls of the container are visible light-transmitting and non-ultraviolet light-transmitting. The curable cyanoacrylate compositions contained within said container are therefore stable under ambient storage conditions, and yet the curable cyanoacrylate compositions are visible through the walls of the container.A package comprising the container and a curable cyanoacrylate composition is also described.

Description

A CONTAINER FOR, AND A PACKAGING INCLUDING, CYANOACRYLATE COMPOSITION(S) Field of invention

[0001] The present invention relates to a container for curable cyanoacrylate compositions and to a container comprising (i) a container for curable cyanoacrylate compositions and (ii) a curable cyanoacrylate composition contained within the container. Background of the invention

[0002] Curable cyanoacrylate compositions tend to be unstable in storage when exposed to ambient light. For example, curable cyanoacrylate compositions will typically gel and solidify within several weeks when exposed to ambient light, such as sunlight filtered through a window (sunlight through a glass window of a building). As a result, curable cyanoacrylate compositions have been sold in packaging comprising (i) a container for curable cyanoacrylate compositions and (ii) a curable cyanoacrylate composition held within the container. For example, certain curable cyanoacrylate products are sold in packaging comprising plastic bottles. MA / Ί 1 I can be colored / opaque or sold in an opaque secondary package.

[0003] Some curable cyanoacrylate compositions are sold in packaging comprising transparent containers, but curable cyanoacrylate compositions tend to be unstable in storage when such containers are exposed to ambient light. Consequently, any such packaging is often labeled with the requirement that it be stored away from light sources; for example, the packaging may be labeled with the requirement that it be stored in a refrigerator. If such requirements are not followed, the curable cyanoacrylate composition will cure prematurely within its container.

[0004] Another problem that arises is that curable cyanoacrylate compositions tend to be quite sensitive, relative to other curable compositions, as curing initiation can occur easily. It is often said that materials that cause premature curing of curable cyanoacrylate compositions are incompatible with curable cyanoacrylate compositions. Consequently, materials that are compatible (do not cause premature curing) with other curable compositions are incompatible (do cause premature curing) with curable cyanoacrylate compositions. Therefore, materials that are compatible with curable cyanoacrylate compositions are the exception, not the rule. Due to this compatibility issue, the materials used for containers for curable cyanoacrylate compositions tend to be much more limited than for other curable compositions.The expert in the field knows that the more reactive / less inert a material is, the more likely it is to be incompatible with curable cyanoacrylate compositions. Brief description of the invention

[0005] The present invention provides a plastic container for holding curable cyanoacrylate compositions that (i) is transmissible to visible light; (ii) is not transmissible to ultraviolet light; and (iii) is compatible with curable cyanoacrylate compositions. The curable cyanoacrylate compositions contained within said container are therefore stable under ambient storage conditions, and yet the curable cyanoacrylate compositions are visible through the container walls.

[0006] Therefore, the present invention provides a transparent plastic container that (i) is transmissible to visible light; (ii) is not transmissible to ultraviolet light; and (iii) is compatible with curable cyanoacrylate compositions.

[0007] In fact, the container of the invention is comparable in performance to a completely opaque plastic container.

[0008] The container of the invention may have any volume suitable to accommodate a desired quantity of curable cyanoacrylate composition, for example, 5 g; 20 g; 50 g; 100 g; 500 g; 1 kg; and 2 kg

[0009] The present invention provides a container for a curable cyanoacrylate composition comprising: a reservoir for containing the curable cyanoacrylate composition, the reservoir having an outlet through which the curable cyanoacrylate composition can be dispensed; The tank is defined by walls of plastic material, the plastic material being formed from a polymeric material that is transmissive to both visible and ultraviolet light; and a UV blocking agent dispersed in the plastic material, the UV blocking agent comprising at least one benzotriazole; where the walls of the container are transmitters of visible light and not transmitters of ultraviolet light.

[0010] The at least one benzotriazole (used as a UV blocking agent) may comprise one or more benzotriazoles MA / Ί 1 t selected from compounds of formula I: Formula I where: Ri is selected from H, an alkyl group having 5 from 1 to 20 carbon atoms, for example having 20 carbon atoms, or an alkylaryl group having 7 to 39 carbon atoms; R2, which may be the same as or different from Ri; is selected from H, an alkyl group having from 1 to 20 carbon atoms, or an alkyl-aryl group having from 7 to 39 carbon atoms; R3 is H, C1 or Br.

[0011] In compounds of formula I, an alkyl group of Ri and / or R2 can have from 1 to 8 carbon atoms, such as 15 from 1 to 5 carbon atoms, desirably from 1 to 4 carbon atoms.

[0012] In compounds of Formula I, an alkylaryl group of Ri and / or R2 can have from 7 to 20 carbon atoms, properly from 7 to 9 carbon atoms.

[0018] The at least one benzotriazole may comprise (CAS 25973-55-1) 2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol,

[0019] The at least one benzotriazole may comprise (CAS 3147-75-9) 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol,

[0020] The at least one benzotriazole may comprise (CAS 73936-91-1) 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol,

[0021] Desirably, in a container of the invention, the polymeric material is a polyolefin material.

[0022] In a suitable form, the polymeric material is polyethylene, for example, HDPE (high-density polyethylene).

[0023] Suitably, the polymeric material is PP (polypropylene).

[0024] In a container of the invention, the UV blocking agent can be dispersed in the plastic material in an amount of approximately 0.05% to approximately 0.3% by weight.

[0025] Ideally, an antioxidant is dispersed in the plastic material. The antioxidant can prevent discoloration otherwise imparted by the material's processing. For example, thermal stress on the component materials during manufacturing and processing can impart yellowing to the plastic material, and the antioxidant prevents this yellowing from occurring.

[0026] The antioxidant agent can be dispersed in the plastic material in an amount of approximately 0.05% to approximately 0.3% by weight.

[0027] In a container of the invention, the container walls are desirably not transmissible to ultraviolet light up to 360 nm, such as up to 370 nm, for example up to 380 nm, suitably up to 390 nm, for example up 395 nm.

[0028] The present invention also provides a container comprising: a container of the invention; and a curable cyanoacrylate composition held within the reservoir of the container.

[0029] The present invention thus provides a container for the storage of curable cyanoacrylate compositions.

[0030] The container of the present invention is compatible with a wide range of curable cyanoacrylate compositions including methyl, ethyl, allyl, beta-methoxyethyl, butyl, and octyl curable cyanoacrylate compositions.

[0031] Cyanoacrylate adhesive compositions are well known and widely used as fast-setting instant adhesives with a wide variety of applications. See H. V. Coover, D. W. Dreifus, and J. T. O'Connor, "Cyanoacrylate Adhesives" in Handbook of Adhesives, 27, 463-77, I. Skeist, ed., Van Nostrand Reinhold, New York, 3rd ed. (1990). See also G. H. Millet, "Cyanoacrylate Adhesives" in Structural Adhesives: Chemistry and Technology, S. R. Hartshorn, ed., Plenum Press, New York, pp. 249-307 (1986).

[0032] The cyanoacrylate component includes at least one cyanoacrylate monomer that can be selected with a number of substituents, such as those represented by H2C=C (CN)COOR, wherein R is selected from C1-15 alkyl, C2-15 alkoxyalkyl, C3-15 cycloalkyl groups, C2-15 alkenyl, Cg-is aralkyl, C5-15 aryl, C2-15 allyl, and haloalkyl. Ideally, the cyanoacrylate monomer is selected from at least one of methyl cyanoacrylate, ethyl 2-cyanoacrylate, propyl cyanoacrylates, butyl cyanoacrylates (such as n-butyl-2-cyanoacrylate), octyl cyanoacrylates, allyl cyanoacrylate, β-methoxyethyl cyanoacrylate, and combinations thereof. A particularly desirable cyanoacrylate monomer includes ethyl 2-cyanoacrylate.

[0032] The cyanoacrylate component shall be included in the compositions in an amount within the range of about 50% to about 99.98% by weight, the range of about 70% to about 95% by weight of the total composition being desirable.

[0033] Accelerators may be included in the cyanoacrylate compositions of the invention, such as any or more selected from calixarenes and oxacalixarenes, silacorones, crown ethers, cyclodextrins, poly(ethylene glycol) di(meth)acrylates, ethoxylated hydride compounds and combinations thereof.

[0035] Many of the calixarenes and oxacalixarenes are known and described in the patent literature. See, for example, U.S. Patents Nos. 4,556,700, 4,622,414, 4,636,539, 4,695,615, 4,718,966, and 4,855,461, the descriptions of each of which are expressly incorporated herein by reference.

[0036] Many silacorones are known and described in the literature. For example, a typical silacorone can be represented within the following structure: R' R---yes------c------I---(cch2cZO where R3 and R4 are organic groups that do not by themselves cause polymerization of the cyanoacrylate monomer, R5 is H or CH3 and n is an integer between 1 and 4. Examples of suitable R3 and R4 groups are R groups, alkoxy groups such as methoxy and aryloxy groups such as phenoxy. The R3 and R4 groups may contain halogen or other substituents, an example being trifluoropropyl. However, unsuitable groups such as R4 and R5 are basic groups such as amino, substituted amino, and alkylamino.

[0037] A large number of crown ethers are known. For example, examples that may be used in this document individually or in combination, or in combination with another accelerator primer, include 15-crown-5, 18-crown-6, dibenzo 18-crown-6, benzo-15-crown-5-dibenzo-24-crown-8, dibenzo30-crown-l0, tribenzo-18-crown-6, asym-dibenzo-22-crown6, dibenzo-14-crown-4, dicyclohexyl-18-crown-6, dicyclohexyl-24-crown-8, cyclohexyl-12-crown-4, 1,2decalyl-15-crown-5, 1,2-naphtho-15-crown-5, 3,4,5-naphthyl-16crown-5, 1,2-methyl-benzo-18-crown-6, 1,2-methylbenzo-5,6methylbenzo-18-crown-6, 1,2-t-butyl-18-crown-6, 1,2-vinylbenzo-15-crown-5, 1,2-vinylbenzo-18-crown-6, 1,2-t-butyl-cyclohexyl-18-crown-6, asym-dibenzo-22-crown-6 and 1,2-benzo-1,4-benzo-5-oxygen-20-crown-7. See U.S. Patent No. 4,837,260 (Sato), the contents of which are expressly incorporated herein by reference.

[0038] Many cyclodextrins may be used in connection with the present invention. For example, those described and claimed in U.S. Patent No. 5,312,864 (Wenz), the description of which is expressly incorporated herein by reference, such as derivatives of the hydroxyl group of an α, β, or γ-cyclodextrin that is at least partially soluble in cyanoacrylate, would be suitable choices.

[0039] A stabilizing pack is also commonly found in cyanoacrylate compositions. The stabilizing pack may include one or more free radical stabilizers and anionic stabilizers, the identity and quantity of which are well known to those skilled in the art. See, for example, U.S. Patents 5,530,037 and 6,607,632, the contents of each of which are incorporated herein by reference.

[0040] Commonly used free radical stabilizers may include hydroquinone, methylhydroquinone, butylated hydroxyanisole, butylated hydroxytoluene, and 4-methoxyphenol, while commonly used anionic stabilizers include boron trifluoride, boron trifluoride etherate, sulfur trioxide (and hydrolysis products thereof), sulfur dioxide, and methanesulfonic acid.

[0041] Other additives may be included to confer additional physical properties, such as improved shock resistance (e.g., citric acid), thickness (e.g., polymethyl methacrylate), thixotropy (e.g., fumed silica), color, hardening agents, moisture additives, e.g., italic anhydride, and heat-resistant additives such as pentafluorobenzonitrile and 3,4,5,6-tetrahydrophthalic anhydride. Detailed description of the invention

[0042] An initial study was conducted to compare the performance of a 20 g opaque Black UV bottle (A) and a 20 g clear Sigma bottle (B) with that of two new containers (C and D) formed from the same HDPE base resin as the 20 g clear Sigma bottle but with the addition of two different mastermixes containing different ultraviolet (UV) blocking agents. A and B are containers for commercially available curable cyanoacrylate compositions. A is a container co-extruded in two layers, with an opaque outer layer to provide protection for UV-sensitive materials, while B is a clear container that transmits UV light. The term 20 g refers to 20 g of curable cyanoacrylate composition within the container.

[0043] For C, a master blend consisting of 2-hydroxy-4-(octyloxy)benzophenone in a polyethylene carrier was added at a reduction rate (LDR) of 2%. 2-hydroxy-4-(octyloxy)benzophenone is a broad-spectrum UV blocking agent.

[0044] For D, a master batch consisting of 2-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol in a polyethylene carrier at a reduction ratio (LDR) of 1.5% was added. 2-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol is a broad-spectrum, red-shifted UV-blocking agent.

[0045] The UV transmission of containers A to D was evaluated by UV-Vis spectroscopy and the results are summarized in Table 1 below. MA / Ί 1 I

[0046] Table 1 Description UV blocking agent contained in the Transmission UV Master Mix A Opaque UV Bottle 20 g Black None added (bottle is opaque). None B Clear Sigma Bottle 20 g None added (bottle is transmissive to visible and ultraviolet light) 235 nm C Clear Sigma Bottle 20 g with added UV blocking agent CAS 1843-05-6 2-Hydroxy-4-octyloxybenzophenone 369 nm D Clear Sigma Bottle 20 g with added UV blocking agent CAS 3896-11-5 2-tert-Butyl-6-(5-chloro-2H-benzotazol-2-yl)-4-methylphenol 395 nm

[0047] Ultraviolet light consists of radiation below 400 nm, with shorter wavelength radiation having higher energy.

[0048] Container A is opaque and therefore no UV light is transmitted through the container.

[0049] Container B, which is the current clear container used for Loctite® cyanoacrylate products, transmits UV light from 235 to 400 nm. Therefore, harmful, high-energy, short-wavelength ultraviolet light can reach the curable cyanoacrylate product inside.

[0050] Container C blocks most of this harmful ultraviolet light, however, it transmits ultraviolet light from 369 nm upwards.

[0051] Container D is more effective at blocking ultraviolet light, transmitting only ultraviolet light from 395 nm upwards.

[0052] Tests were carried out with each container using Loctite® 401. Loctite® 401 is an ethyl cyanoacrylate-based adhesive. It is a one-component, fast-curing, low-viscosity liquid ethyl cyanoacrylate adhesive that is suitable for bonding porous materials and has a clear, colorless to straw-colored appearance.

[0053] Two key properties for this formulation were investigated in each type of container: (i) stability when exposed to sunlight filtered through a window and (ii) thermal stability after aging at 82 °C.

[0054] (i) Stability when exposed to sunlight filtered through the window

[0055] Table 2 summarizes the stability test results when exposed to sunlight filtered through a window (through a glass window of a building) by placing the container on a sill inside the window. After 4 weeks under these conditions, the viscosity of Loctite® 401 in container A has not changed. In contrast, the viscosities in containers B and C have increased, with viscosity ratios of 1.54 and 1.48, respectively. There is a slight increase in viscosity in container D, however, this is minimal to a viscosity ratio of 1.09 after 4 weeks.

[0056] Table 2 Initial 2 weeks of exposure to sunlight filtered through the Window 4 weeks of exposure to sunlight filtered through the Window Container Viscosity at 25 °C (mPa.s) Viscosity at 25 °C (mPa.s) Viscosity ratio Viscosity at 25 °C (mPa.s) Viscosity ratio A 87.2 83.5 0.96 82.7 0.95 B 105.3 1.21 134 1.54 C 98.8 1.13 129 1.48 D 87.8 1.01 95.7 1.09 B with front and back label 95.2 1.09 106 1.22 C with front and back label 91.5 1.05 106 1.22 D with front and back label 89.9 1.03 89 1.02

[0057] Containers B, C, and D were also tested with a label covering 12.4 cm² on both the front and back of the container to provide a more realistic representation of Loctite® cyanoacrylate products on the market. Container A was not tested with labels as it is completely opaque.

[0058] Containers B and C show an increase in viscosity, with a ratio of 1.22 after 4 weeks. Viscosity was measured using a cone and plate rheometer at a shear rate of 3000 s-1 at 25 °C.

[0059] The viscosity ratio is the ratio between aged viscosity and initial viscosity (initial viscosity = viscosity before exposure).

[0060] There is no change in viscosity for container D after 4 weeks in this condition.

[0061] No changes in product performance properties (setting time, tensile shear strength) were observed after 4 weeks of exposure to window-filtered sunlight in each package (Table 3). Setting time (in seconds s) in overlapping shear specimens was defined as the time to develop a shear strength of 0.1 N / mm² and was measured at 22 °C and 50% relative humidity. Tensile shear strength (in N / mm²) was measured according to ISO 4587:2003.

[0062] Used overlapping shears: MS = mild steel Al = aluminum PC = polycarbonate PVC = polyvinyl chloride GBMS = shot-peened mild steel.

[0063] Table 3 Setting time (s) Overlap shear strength (N / mm2) Heat aging (N / mm2) MS Al PC PVC GBMS 24hRTC PC 24hRTC GBMS 1000 ha 120°CA < 10 < 10 10- 20 < 10 18.2 ±2.1 6.3 ±0.6 8.0 ±2.3 B < 10 < 10 < 10 < 10 16.7 ±1.0 4.4 ±0.3 4.2 ±3.3 C < 10 < 10 < 10 < 10 16.9 ±0.7 5.1 ±0.6 6.6 ±3.9 D < 10 < 10 < 10 < 10 16.4 ±0.4 4.7 ±0.7 7.5 ±4.4 B with front and back label < 10 < 10 < 10 < 10 16.2 ±2.0 6.7 ±0.4 6.3 ±3.6 C with < 10 < 10 < 10 < 10 16.5 ±0.9 6.2 ±1.0 8.7 ±3.2 front and back label D with front and back label < 10 < 10 < 10 < 10 18.1 ±0.3 5.9 ±0.4 10.8 ±0.4 MA / Ί 1 I

[0064] In the data presented here, h = hours; RTC = ambient temperature conditions, e.g., 24hRTC = 24 hours at ambient temperature conditions.

[0065] (ii) Thermal stability after aging at 82 °C

[0066] The compatibility of each container type with Loctite® 401 was also investigated by thermal aging at 82 °C (see Table 4). After 3 days at 82 °C, the containers A, B, and D all showed good compatibility with the formulation, with viscosity indices all below 3. However, a viscosity index of 3.9 was determined for the formulation in container C. After another 3 days at 82 °C, the formulation in container C had gelled solid.

[0067] Table 4 3 days at 82 °C 6 days at 82 °C Appearance Viscosity at 25 °C (mPa.s) Viscosity ratio Appearance Viscosity at 25 °C (mPa.s) Viscosity ratio A Colorless 186 2.1 Colorless 380 4.4 B Colorless 177 2 Colorless 353 4 C Colorless 344 3.9 Colorless Gelled solid Gelled solid D Colorless 181 2.1 Colorless 388 4.4

[0068] These results demonstrate that it is possible to incorporate UV-blocking agents into the resin used for the clear cyanoacrylate container. These UV-blocking agents block the transmission of high-energy, short-wavelength UV radiation, as expected.

[0069] However, only the benzotriazole-type UV blocking agent is effective in protecting Loctite® 401 inside the container, preventing an increase in viscosity when exposed to sunlight filtered through the window.

[0070] Only the benzotriazole-type UV blocking agent is compatible with the cyanoacrylate formulation. This is surprising. Given the generally reactive nature of benzotriazoles, it is surprising that they do not produce premature curing of the curable cyanoacrylate compositions.

[0071] Compared to the opaque black UV bottle, the D container is just as effective at protecting cyanoacrylates from UV light and is transparent.

[0072] An additional study was carried out with Loctite® 401 in container B, the 20 g sigma clear bottle, and container E, wherein the master mixture consisting of 2tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol in a polyethylene vehicle was added at a reducing ratio (LDR) of 1.0% to the base HDPE resin (see the Table 5 below). MA / Ί 1 t

[0073] Table 5 Packaging Description UV Blocking Agent UV Transmission from B Clear Sigma Bottle 20 g None 235 nm E Clear Sigma bottle of 20 g with UV blocking agent and antioxidant CAS 3896-11-5 2-ε-Butyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol 395 nm

[0074] The samples were exposed to continuous light in the Q-SUN Xe-1 Xenon Are test chamber for a defined period of time. The Q-SUN Xe-1 provides an excellent simulation of direct and indirect sunlight in accordance with ASTM G-155. The light spectrum emitted by the Q-SUN Xe-1 is approximately equivalent to midday sunlight in midsummer in the Northern Hemisphere. When the The Q-Sun Xe-1 is equipped with a Window-Q filter; the light emitted in the test chamber is approximately equivalent to direct sunlight entering through a single-pane, single-resistor glass panel. Table 6 below describes the exposure conditions in the Q-SUN Xe-1 used for this study.

[0075] Table 6 Standard exposure conditions for Q-SUN: Window-Q filter (UV cutoff 310 nm), Irradiation 10 W / m² / nm, Irradiation control point 420 nm, Black panel temperature 22 °C

[0076] The appearance of Loctite® 401 in containers B and E was monitored after exposure to the Q-SUN for defined time periods. After each time point, the appearance was recorded, and the results are summarized in Table 7 below. Loctite® 401 in container B was found to be a solid gel after 18 hours of exposure to the Q-SUN. In contrast, Loctite® 401 in container E was a clear, colorless liquid even after 65 hours of exposure to the Q-SUN. ML / Ί 1 I

[0077] Table 7 Loctite® 401 in container B Loctite® 401 in container E 0 hours exposure Clear, colorless liquid Clear, colorless liquid 12 hours exposure Clear, colorless liquid Clear, colorless liquid 15 hours exposure Clear, colorless liquid Clear, colorless liquid 18 hours exposure Gelled solid Clear, colorless liquid 20 hours exposure Clear, colorless liquid 30 hours exposure - Clear, colorless liquid 40 hours exposure Clear, colorless liquid 50 hours of exposure: Clear, colorless liquid. 60 hours of exposure: Clear, colorless liquid. 65 hours of exposure: Clear, colorless liquid.

[0078] The viscosity, set time, and shear strength of the lap joint of this Loctite® 401 were tested after 65 hours of exposure to Q-SUN in container E. The results are summarized in Table 8 below. The viscosity had not increased significantly, and the set time and shear strength of the tensile lap joint met all required product specifications.

[0079] Table 8 Loctite® 401 Packaging Type E Exposure Time Q-SUN 65 hours Appearance Transparent and colorless Viscosity at 25 °C (mPa.s) 99.4 Viscosity Ratio 1.02 Fixation on MS (s) < 10 Fixation on PC (s) < 10 Overlap Shear Strength 17.22 ±0.59 GBMS 24hRTC (N / mm2) Overlap shear force PC 24hRTC (N / mm2) 7.96 ±0.71

[0080] After demonstrating the UV protection properties of container E compared to container B, a compatibility study was carried out with a range of commercially available Loctite® products to confirm the suitability of container E as a commercial container for these products.

[0081] Loctite® 403 is a grade of beta-methoxy ethyl cyanoacrylate-based adhesive. It is a one-component, medium-viscosity, fast-curing, low-odor / low-gloss liquid beta-methoxy ethyl cyanoacrylate adhesive with a clear, colorless to pale yellow appearance.

[0082] Loctite® 406 is a grade of ethyl cyanoacrylate-based adhesive. It is a one-part, low-viscosity, moisture-absorbing, fast-curing liquid ethyl cyanoacrylate adhesive with a clear, colorless to straw-colored appearance.

[0083] Loctite® 424 is a grade of ethyl cyanoacrylate-based adhesive. It is a low-viscosity, general-purpose, fast-curing, one-component liquid ethyl cyanoacrylate adhesive with a clear, colorless to straw-colored appearance.

[0084] Loctite® 435 is a grade of adhesive based on rubber-cure ethyl cyanoacrylate. It is a one-component, low-viscosity, fast-curing, liquid ethyl cyanoacrylate adhesive with a colorless to straw-colored, slightly cloudy appearance.

[0085] Loctite® 460 is a grade of beta-methoxy ethyl cyanoacrylate-based adhesive. It is a one-component, low-viscosity, fast-curing, low-odor / low-gloss liquid beta-methoxy ethyl cyanoacrylate adhesive with a clear, colorless to straw-colored appearance.

[0086] Loctite® 480 is a grade of adhesive based on rubber-cure ethyl cyanoacrylate. It is a one-component, low-viscosity, fast-curing, liquid ethyl cyanoacrylate adhesive with a black appearance.

[0087] Loctite® 495 is a grade of ethyl cyanoacrylate-based adhesive. It is a low-viscosity, general-purpose, fast-curing, one-component liquid ethyl cyanoacrylate adhesive with a clear, colorless to straw-colored appearance.

[0088] Loctite® 4850 is a grade of adhesive based on ethyl butyl cyanoacrylate. It is a one-component, medium-viscosity, fast-curing liquid adhesive with a clear, colorless to straw-colored appearance.

[0089] Loctite® 4062 is a grade of ethyl cyanoacrylate-based adhesive. It is a one-component, very low-viscosity, fast-curing liquid ethyl cyanoacrylate adhesive with a clear, colorless to straw-colored appearance.

[0090] Thermal aging studies were conducted with these Loctite® products in containers B and E at 82 °C, and the results are summarized in Table 9 below. The stability of the Loctite® product grades tested in container E was found to be comparable to the stability in container B after 3 days at 82 °C. IVIA / I Ί /

[0091] Table 9 Initial 3 days at 82 °C Product Viscosity @25 °C (mPa.s) Container Viscosity @25 °C (mPa.s) Viscosity Ratio Loctite® 403 1040 B 1170 1.13 E 1180 1.13 Loctite® 406 18.2 B 26.4 1.45 E 28.8 1.58 Loctite® 424 91 B 109 1.20 E 114 1.25 Loctite® 435 128 B 162 1.27 E 171 1.34 Loctite® 460 30.8 B 38.3 1.24 E 39.2 1.27 Loctite® 480 133 B 164 1.23 E 168 1.26 Loctite® 495 34.8 B 45.9 1.32 E 49.4 1.42 Loctite® 4062 1.22 B 1.33 1.09 E 1.42 1.16 Loctite® 4850 327 B 354 1.08 E 412 1.26

[0092] The words comprise / comprising and the words having / includes when used herein with reference to the present invention are used to specify the presence of established features, whole numbers, steps or components, but do not exclude the presence or addition of one or more features, whole numbers, steps, components or groups thereof.

[0093] It is appreciated that certain features of the invention, which, for clarity, are described in the context of separate embodiments, can also be provided in combination in a single embodiment. Conversely, various features of the invention, which, for reasons of brevity, are described in the context of a single embodiment, can also be provided separately or in any suitable subcombination.

Claims

CLAIMS 1. A container for a curable cyanoacrylate composition comprising: a reservoir for containing the curable cyanoacrylate composition, wherein the reservoir has an outlet through which the curable cyanoacrylate composition can be dispensed; the reservoir is defined by walls of plastic material, the plastic material being formed from a polymeric material that is transmissive to both visible and ultraviolet light; and a UV blocking agent dispersed in the plastic material, wherein the UV blocking agent comprises at least one benzotriazole; wherein the walls of the container are visible light transmitting and non-ultraviolet light transmitting.

2. The container according to claim 1, wherein the at least one benzotriazole comprises one or more benzotriazoles selected from compounds of formula I: Formula I wherein: Ri is selected from H, an alkyl group having 1 to 20 carbon atoms or an alkylaryl group having 7 to 39 carbon atoms; R2, which may be the same as or different from Ri, is selected from H, an alkyl group having 1 to 20 carbon atoms, or an alkylaryl group having 7 to 39 carbon atoms; R3 is H, C1 or Br.

3. The container according to claim 2, wherein in the compounds of Formula I, the alkyl group of Ri and / or R2 has from 1 to 8 carbon atoms, such as from 1 to 5 carbon atoms, desirably from 1 to 4 carbon atoms.

4. The container according to claim 2 or claim 3, wherein in the compounds of Formula I, the alkylaryl group of Ri and / or R2 has from 7 to 20 carbon atoms, appropriately from 7 to 9 carbon atoms.

5. The container according to any one of claims 2 to 4, wherein in the compounds of formula I, Ri or R2 can be independently selected from: -H; -CH3; -C(CH3)3; -C(CH3)2C2H5; -C(CH3)2CH2C(CH3)3; and -C(CH3)2C6H5 6. The container according to any one of claims 2 to 4, wherein in the compounds of Formula I, at least one of Ri and R2 is tere-butyl.

7. The container according to any of the preceding claims, wherein the at least one benzotriazole comprises CAS 3896-11-5 2-tert-butyl-6-(5-chloro2H-benzotriazol-2-yl)-4-methylphenol, 8. The container according to any of the preceding claims, wherein the at least one benzotriazole comprises CAS 3864-99-1 2,4-di-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)phenol MA / Ί 1 I 9. The container according to any of the preceding claims, wherein the at least one benzotriazole comprises CAS 25973-55-1 2-(2H-benzotriazol-2yl)-4,6-di-tert-pentylphenol 5 10. The container according to any of the preceding claims, wherein the at least one benzotriazole comprises CAS 3147-75-9 2-(2H-benzotriazol-2yl)-4-(1,1,3,3-tetramethylbutyl)phenol 11. The container according to any of the 10 preceding claims, wherein the at least one benzotriazole comprises CAS 73936-91-1 2-(2H-benzotriazol-2yl)-6-(1-methyl-l-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol 12. The container conforming to any of the preceding claims, wherein the polymeric material is a polyolefinic material.

13. The container conforming to any of the preceding claims, wherein the polymeric material is polyethylene.

14. The container according to claim 13, wherein the polymeric material is HDPE (high-density polyethylene).

15. The container conforming to any of claims 1 to 12, wherein the polymeric material is PP (polypropylene).

16. The container according to any of the preceding claims, wherein the UV blocking agent is dispersed in the plastic material in an amount of approximately 0.05% to approximately 0.3% by weight.

17. The container conforming to any of the preceding claims, further comprising an antioxidant dispersed in the plastic material.

18. The container according to claim 17, wherein the antioxidant is dispersed in the plastic material in an amount of approximately 0.05% to approximately 0.3% by weight.

19. The container conforming to any of the preceding claims, wherein the walls of the container do not transmit ultraviolet light up to 360 nm.

20. The container conforming to any of the preceding claims, wherein the walls of the container do not transmit ultraviolet light up to 370 nm.

21. The container conforming to any of the preceding claims, wherein the walls of the container do not transmit ultraviolet light up to 380 nm.

22. The container conforming to any of the preceding claims, wherein the walls of the container do not transmit ultraviolet light up to 390 nm.

23. The container conforming to any of the preceding claims, wherein the walls of the container do not transmit ultraviolet light up to 395 nm.

24. A container comprising: (i) the receptacle according to any of the preceding claims; and (ii) a curable cyanoacrylate composition held within the reservoir of the receptacle.