US20080314519A1 - Toughened Cyanoacrylate Compositions - Google Patents

Toughened Cyanoacrylate Compositions Download PDF

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US20080314519A1
US20080314519A1 US11/995,043 US99504306A US2008314519A1 US 20080314519 A1 US20080314519 A1 US 20080314519A1 US 99504306 A US99504306 A US 99504306A US 2008314519 A1 US2008314519 A1 US 2008314519A1
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cyanoacrylate
composition according
combinations
vamac
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Shabbir Attarwala
Rosa M. Davila
Benjamin Surowiecki
Stan Wojciak
Ling Li
Roger Grismala
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Henkel IP and Holding GmbH
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Henkel Corp
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
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    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
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    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C09J123/08—Copolymers of ethene
    • C09J123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C09J123/0869—Acids or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
    • C08F222/30—Nitriles
    • C08F222/32—Alpha-cyano-acrylic acid; Esters thereof
    • C08F222/322—Alpha-cyano-acrylic acid ethyl ester, e.g. ethyl-2-cyanoacrylate
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C08K5/092—Polycarboxylic acids
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/15—Heterocyclic compounds having oxygen in the ring
    • C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
    • C08K5/1535—Five-membered rings
    • C08K5/1539—Cyclic anhydrides
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/15—Heterocyclic compounds having oxygen in the ring
    • C08K5/159—Heterocyclic compounds having oxygen in the ring having more than two oxygen atoms in the ring
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
    • C08K5/3415—Five-membered rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer

Definitions

  • This invention relates to cyanoacrylate compositions that include, in addition to the cyanoacrylate component, a rubber toughening component, which is substantially clear and colorless and which is substantially free of release agents and anti-oxidants known to impair the fixture speeds and shelf life stability of cyanoacrylate compositions to which they are added.
  • a rubber toughening component which is substantially clear and colorless and which is substantially free of release agents and anti-oxidants known to impair the fixture speeds and shelf life stability of cyanoacrylate compositions to which they are added.
  • the inventive rubber toughened cyanoacrylate compositions demonstrate improved properties, such as fixture speed, strength and shelf life under accelerated aging conditions.
  • Cyanoacrylate adhesive compositions are well known, and widely used as quick setting, instant adhesives with a wide variety of uses. 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, p. 249-307 (1986).
  • U.S. Pat. No. 4,440,910 (O'Connor) pioneered rubber-toughened cyanoacrylate compositions through the use of certain organic polymers as toughening additives that are elastomeric, i.e., rubbery, in nature.
  • the '910 patent is thus directed to and claims a curable adhesive comprising a substantially solvent-free mixture of: (a) a cyanoacrylate ester, and (b) about 0.5% to about 20% by weight of an elastomeric polymer.
  • the elastomeric polymer is selected from elastomeric copolymers of a lower alkene monomer and (i) acrylic acid esters, (ii) methacrylic acid esters or (iii) vinyl acetate.
  • the '910 patent notes that as toughening additives for cyanoacrylates, acrylic rubbers; polyester urethanes; ethylene-vinyl acetates; fluorinated rubbers; isoprene-acrylonitrile polymers; chlorosulfinated polyethylenes; and homopolymers of polyvinyl acetate were found to be particularly useful.
  • the elastomeric polymers are described in the '910 patent as either homopolymers of alkyl esters of acrylic acid; copolymers of another polymerizable monomer, such as lower alkenes, with an alkyl or alkoxy ester of acrylic acid; and copolymers of alkyl or alkoxy esters of acrylic acid.
  • Other unsaturated monomers which may be copolymerized with the alkyl and alkoxy esters of acrylic include dienes, reactive halogen-containing unsaturated compounds and other acrylic monomers such as acrylamides.
  • VAMAC N123 and VAMAC B-124 are reported by DuPont to be a master batch of ethylene/acrylic elastomer.
  • Henkel Corporation (as the successor to Loctite Corporation) has sold for a number of years since the filing of the '910 patent rubber toughened cyanoacrylate adhesive products under the tradename BLACK MAX, which employ as the rubber toughening component the DuPont materials called VAMAC B-124 and N123.
  • Henkel has sold in the past clear and substantially colorless rubber toughened cyanoacrylate adhesive products, namely, LOCTITE 4203, 4204 and 4205, which employ as the rubber toughening component the DuPont material, VAMAC G. While VAMAC G contains no fillers to provide color or stabilizers, it does contain processing aids.
  • processing aids or release systems—are reported to be ARMEEN 18D and stearic acid in combination with GAFAC RL-210 (or with VANFRE UN, ZELEC UN or SERVOXYL VPAZ-100).
  • polyethylene glycol ether wax is also used as a processing aid. Waxes such as this interfere with the physical properties of cyanoacrylate compositions.
  • VAMAC VCS rubber appears to be the base rubber, from which the remaining members of the VAMAC product line are compounded
  • VAMAC VCS is a reaction product, of the combination of ethylene, methyl acrylate and monomers having carboxylic acid cure sites, which once formed is then substantially free of processing aids such as the release agents octadecyl amine, complex organic phosphate esters and/or stearic acid, and anti-oxidants, such as substituted diphenyl amine.
  • VAMAC VMX 1012 and VCD 6200 are rubbers made from ethylene and methyl acrylate. It is believed that the VAMAC VMX 1012 rubber possesses little to no carboxylic acid in the polymer backbone. Like the VAMAC VCS rubber, the VAMAC VMX 1012 and VCD 6200 rubbers are substantially free of processing aids such as the release agents octadecyl amine, complex organic-phosphate esters and/or stearic acid, and anti-oxidants, such as substituted diphenyl amine, noted above.
  • processing aids such as the release agents octadecyl amine, complex organic-phosphate esters and/or stearic acid, and anti-oxidants, such as substituted diphenyl amine, noted above.
  • the present invention is thus directed to a rubber toughened cyanoacrylate adhesive composition, which includes beyond the cyanoacrylate component, a rubber toughening component having (a) reaction products of the combination of ethylene, methyl acrylate and monomers having carboxylic acid cure sites, (b) dipolymers of ethylene and methyl acrylate, and combinations of (a) and (b), which once the reaction products and/or dipolymers are formed are then substantially free of processing aids, such as the release agents octadecyl amine (reported by DuPont to be available commercially from Akzo Nobel under the tradename ARMEEN 18D), complex organic phosphate esters (reported by DuPont to be available commercially from R.T.
  • a rubber toughening component having (a) reaction products of the combination of ethylene, methyl acrylate and monomers having carboxylic acid cure sites, (b) dipolymers of ethylene and methyl acrylate, and combinations of (a) and (b), which once the reaction products
  • Vanderbilt Co., Inc. under the tradename VANFRE VAM stearic acid and/or polyethylene glycol ether wax, and anti-oxidants, such as substituted diphenyl amine (reported by DuPont to be available commercially from Uniroyal Chemical under the tradename NAUGARD 445).
  • VAMAC acrylic rubbers available from DuPont, such as VAMAC G or VAMAC B-124.
  • VAMAC G or VAMAC B-124 VAMAC acrylic rubber products when used together with cyanoacrylates have a tendency to destabilize the cyanoacrylate on the one hand (thus resulting in a shorter shelf life as the cyanoacrylate becomes more reactive) and to retard fixture speed on the other hand, Neither of these affects are particularly desirable.
  • LOCTITE 4203, 4204 and 4205 are each substantially clear and colorless rubber toughened cyanoacrylate adhesive products made with VAMAC G, the presence of the release agents and anti-oxidants in the VAMAC product, sometimes leads to the adverse affects noted in the preceding paragraph.
  • the inclusion of the rubber toughening agent noted above that is not compounded with such release agents and anti-oxidants into a cyanoacrylate composition provides for demonstrated improved properties, such as fixture speeds, shear strengths, fracture toughness and shelf life, when compared to the BLACK MAX products or LOCTITE 4203, 4204 and 4205, and at least comparable fixture speeds and shelf life when compared to non-rubber toughened, thickened cyanoacrylate adhesive products, such as LOCTITE PRISM 401.
  • a radiation-curable composition which includes a cyanoacrylate component or a cyanoacrylate-containing formulation, a metallocene component, a photoinitiator, and a rubber toughening component comprising (a) reaction products of the combination of ethylene, methyl acrylate and monomers having carboxylic acid cure sites, (b) dipolymers of ethylene and methyl acrylate, and combinations of (a) and (b), which once the reaction products and/or dipolymers are formed are then substantially free of processing aids, such as the release agents octadecyl amine, complex organic phosphate esters, stearic acid and/or polyethylene glycol ether wax, and anti-oxidants, such as substituted diphenyl amine.
  • processing aids such as the release agents octadecyl amine, complex organic phosphate esters, stearic acid and/or polyethylene glycol ether wax, and anti-oxidants, such as substituted diphenyl amine.
  • This invention is also directed to a method of bonding together two substrates, which method includes applying to at least one of the substrates a composition as described above, and thereafter mating together the substrates.
  • the method when using the radiation-curable composition as so defined, may be used where at least one of the substrates is substantially transmissive to the radiation used to cure the composition.
  • the present invention is directed to reaction products of the inventive compositions.
  • the invention is directed to a method of preparing the inventive compositions.
  • the invention is directed to a method of conferring one or more of the following properties to rubber toughened cyanoacrylate compositions improved shelf life, fixture speed, improved shear strength development over time, and improved side impact strength and fracture toughness, which method includes the steps of providing a cyanoacrylate composition, providing a rubber toughening agent of (a) reaction products of the combination of ethylene, methyl acrylate and monomers having carboxylic acid cure sites or (b) dipolymers of ethylene and methyl acrylate (or combinations thereof), and being substantially free of processing acids and/or anti-oxidants, and mixing together the cyanoacrylate compositions and rubber toughening agents.
  • FIG. 1 depicts a plot of the development of lap shear strength overtime for an invention composition compared with two control products on aluminum substrates.
  • FIG. 2 depicts a plot of the development of lap shear-strength overtime for an invention composition compared with two control products on steel substrates.
  • FIG. 3 depicts a plot of the development of lap shear-strength overtime for an invention composition compared with two control products on polyvinyl chloride substrates.
  • this invention is directed to a rubber toughened cyanoacrylate adhesive composition, which includes beyond the cyanoacrylate component, a rubber toughening component having (a) reaction products of the combination of ethylene, methyl acrylate and monomers having carboxylic acid cure sites, (b) dipolymers of ethylene and methyl acrylate, and combinations of (a) and (b), which once the reaction products and/or dipolymers are formed are then substantially free of processing aids, such as octadecyl amine (reported by DuPont to be available commercially from Akzo Nobel under the tradename, ARMEEN 18D), complex organic phosphate esters (reported by DuPont to be available commercially from R.T.
  • processing aids such as octadecyl amine (reported by DuPont to be available commercially from Akzo Nobel under the tradename, ARMEEN 18D), complex organic phosphate esters (reported by DuPont to be available commercially from R.T.
  • VANFRE VAM stearic acid
  • polyethylene glycol ether wax and anti-oxidants such as substituted diphenyl amine (reported by DuPont to be available commercially from Uniroyal Chemical under the tradename NAUGARD 445).
  • the cyanoacrylate component includes cyanoacrylate monomers which may be chosen with a raft of substituents, such as those represented by H 2 C ⁇ C(CN)—COOR, where R is selected from C 1-15 alkyl, alkoxyalkyl, cycloalkyl, alkenyl, aralkyl, aryl, allyl and haloalkyl groups.
  • the cyanoacrylate monomer is selected from methyl cyanoacrylate, ethyl-2-cyanoacrylate, propyl cyanoacrylates, butyl cyanoacrylates (such as n-butyl-2-cyanoacrylate), octyl cyanoacrylates, allyl cyanoacrylate, ⁇ -methoxyethyl cyanoacrylate and combinations thereof.
  • a particularly desirable one is ethyl-2-cyanoacrylate.
  • the cyanoacrylate component should be included in the compositions in an amount within the range of from about 50% to about 98% by weight, with the range of about 75% to about 95% by weight being desirable, and about 85 to about 90% by weight of the total composition being particularly desirable.
  • the rubber toughening component is a reaction product of the combination of ethylene, methyl acrylate and monomers having carboxylic acid cure sites, which once formed is then substantially free of processing aids and anti-oxidants.
  • the processing aids are release agents such as octadecyl amine (reported by DuPont to be available commercially from Akzo Nobel under the tradename ARMEEN 18D), complex organic phosphate esters (reported by DuPont to be available commercially from R.T. Vanderbilt Co., Inc. under the tradename VANFRE VAM), stearic acid and/or polyethylene glycol ether wax.
  • the anti-oxidant is a substituted diphenyl amine (reported by DuPont to be available commercially from Uniroyal Chemical under the tradename NAUGARD 445).
  • the rubber toughening component is a dipolymer of ethylene and methyl acrylate, which once formed is then substantially free of processing aids and anti-oxidants.
  • the rubber toughening component may be a combination of the reaction product of the preceding paragraph and the dipolymer of this paragraph.
  • the rubber toughening component should be present in a concentration of about 1.5% to about 20% by weight, such as about 5% to about 15% by weight, with about 8% to about 10% being particularly desirable.
  • organometallic materials are also suitable for use herein. Those materials of particular interest herein may be represented by metallocenes within structure I:
  • R 1 and R 2 may be the same or different and may occur at least once and up to as many four times on each ring in the event of a five-membered ring and up to as many as five times on each ring in the event of a six-membered ring;
  • R 1 and R 2 may be selected from H; any straight- or branched-chain alkyl constituent having from 1 to about 8 carbon atoms, such as CH 3 , CH 2 CH 3 , CH 2 CH 2 CH 3 , CH(CH 3 ) 2 , C(CH 3 ) 3 or the like; acetyl; vinyl; allyl; hydroxyl; carboxyl; —(CH 2 ) n —OH, where n may be an integer in the range of 1 to about 8; —(CH 2 ) n —COOR 3 , where n may be an integer in the range of 1 to about 8 and R 3 may be any straight- or branched-chain alkyl constituent having from 1 to about 8 carbon atoms; H; Li; Ma; or —(CH 2 ) n′ , where n′ may be an integer in the range of 2 to about 8; —(CH 2 ) n —OR 4 , wherein n may be an integer in the range of 1 to about 8 and R 4
  • Y 1 and Y 2 may not be present at all, but when at least one is present they may be the same or different and may be selected from H, Cl ⁇ , Br ⁇ , I ⁇ , cyano, methoxy, acetyl, hydroxy, nitro, trialkylamines, triarylamines, trialkylphospines, triphenylamine, tosyl and the like;
  • a and A′ may be the same or different and may be C or N;
  • n and m′ may be the same or different and may be 1 or 2;
  • M e is Fe, Ti, Ru, Co, Ni, Cr, Cu, Mn, Pd, Ag, Rh, Pt, Zr, Hf, Nb, V, Mo and the like.
  • the element represented by M e may have additional ligands—Y 1 and Y 2 —associated therewith beyond the carbocyclic ligands depicted above (such as where M e is Ti and Y 1 and Y 2 are Cl ⁇ ).
  • metallocene structure I may be modified to include materials such as:
  • R 1 , R 2 , Y 1 , Y 2 , A, A′, m, m′ and M e are as defined above.
  • a particularly desirable example of such a material is where R 1 and R 2 are each H; Y 1 and Y 2 are each Cl; A and A′ are each N; m and m′ are each 2 and M e is Ru.
  • metallocene structure II well-suited metallocene materials may be chosen from within metallocene structure II:
  • R 1 , R 2 and M e are as defined above.
  • Particularly well-suited metallocene materials from within structure I may be chosen where R 1 , R 2 , Y 1 , Y 2 , m and m′ are as defined above, and M e is chosen from Ti, Cr, Cu, Mn, Ag, Zr, Hf, Nb, V and Mo.
  • the metallocene is selected from ferrocenes (i.e., where M e is Fe), such as ferrocene, vinyl ferrocenes, ferrocene derivatives, such as butyl ferrocenes or diarylphosphino metal-complexed ferrocenes [e.g., 1,1-bis(diphenylphosphino)ferrocene-palladium dichloride], titanocenes (i.e., where M e is Ti), such as bis( ⁇ 5 -2,4-cyclopentadien-1-yl)-bis-[2,6-difluoro-3-(1H-pyrrol-1-yl)phenyl]titanium which is available commercially from Ciba Specialty Chemicals, Tarrytown, N.Y. under the tradename “IRGACURE” 784DC, and derivatives and combinations thereof.
  • M e ferrocenes
  • M e is Fe
  • ferrocene
  • bis-alkylmetallocenes for instance, bis-alkylferrocenes (such as diferrocenyl ethane, propanes, butanes and the like) are also desirable for use herein, particularly since about half of the equivalent weight of the material (as compared to a non-bis-metallocene) may be employed to obtain the sought-after results, all else being unchanged.
  • bis-alkylferrocenes such as diferrocenyl ethane, propanes, butanes and the like
  • propanes propanes, butanes and the like
  • M e [CW 3 —CO—CH ⁇ C(O ⁇ )—CW′ 3 ] 2 where M e is as defined above, and W and W may be the same or different and may be selected from H, and halogens, such as F and Cl.
  • W and W may be the same or different and may be selected from H, and halogens, such as F and Cl.
  • halogens such as F and Cl.
  • examples of such materials include platinum (II) acetyl acetonate (“PtACAC”), cobalt (II) acetyl acetonate (“CoACAC”), nickel (II) acetyl acetonate (“NiACAC”) and copper (II) acetyl acetonate (“CuACAC”). Combinations of those materials may also be employed.
  • Photoinitiators enhance the rapidity of the curing process when the photocurable compositions as a whole are exposed to electromagnetic radiation.
  • Certain metallocenes such as “IRGACURE” 784DC, may serve a dual purpose as both metallocene and photoinitiator.
  • photoinitiators for use herein include, but are not limited to, photoinitiators available commercially from Ciba Specialty Chemicals, Tarrytown, N.Y. under the “IRGACURE” and “DAROCUR” tradenames, specifically “IRGACURE” 184 (1-hydroxycyclohexyl phenyl ketone), 907 (2-methyl-1-[4-(methylthio)phenyl]-2-morpholino propan-1-one), 369 (2-benzyl-2-N,N-dimethylamino-1-(4-morpholinophenyl)-1-butanone), 500 (the combination of 1-hydroxy cyclohexyl phenyl ketone and benzophenone), 651 (2,2-dimethoxy-2-phenyl acetophenone), 1700 (the combination of bis(2,6-dimethoxybenzoyl-2,4-,4-trimethyl pentyl)phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-prop
  • photoinitiators useful herein include alkyl pyruvates, such as methyl, ethyl, propyl, and butyl pyruvates, and aryl pyruvates, such as phenyl, benzyl, and appropriately substituted derivatives thereof.
  • Photoinitiators particularly well-suited for use herein include ultraviolet photoinitiators, such as 2,2-dimethoxy-2-phenyl acetophenone (e.g., “IRGACURE” 651), and 2-hydroxy-2-methyl-1-phenyl-1-propane (e.g., “DAROCUR” 1173), bis(2,4,6-trimethyl benzoyl)phenyl phosphine oxide (e.g., “IRGACURE” 819), and the ultraviolet/visible photoinitiator combination of bis(2,6-dimethoxybenzoyl-2,4,4-trimethylpentyl)phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propan-1-one (e.g., “IRGACURE” 1700), as well as the visible photoinitiator bis( ⁇ 5 -2,4-cyclopentadien-1-yl)-bis[2,6-difluoro-3-(1H-pyrrol-1-yl)phenyl]t
  • Accelerators may also be included in the inventive rubber toughened cyanoacrylate compositions, such as any one or more selected from calixarenes and oxacalixarenes, silacrowns, crown ethers, cyclodextrins, poly(ethyleneglycol) di(meth)acrylates, ethoxylated hydric compounds and combinations thereof.
  • calixarenes those within the following structure are useful herein:
  • R 1 is alkyl, alkoxy, substituted alkyl or substituted alkoxy
  • R 2 is H or alkyl
  • n is 4, 6 or 8.
  • calixarene is tetrabutyl tetra[2-ethoxy-2-oxoethoxy]calix-4-arene.
  • crown ethers are known.
  • examples which may be used herein either individually or in combination, or in combination with other first accelerator are known.
  • silacrowns again many are known, and are reported in the literature.
  • a typical silacrown may be represented within the following structure:
  • R 3 and R 4 are organo groups which do not themselves cause polymerization of the cyanoacrylate monomer
  • R 5 is H or CH 3 and n is an integer of between 1 and 4.
  • suitable R 3 and R 4 groups are R groups, alkoxy groups, such as methoxy, and aryloxy groups, such as phenoxy.
  • the R 3 and R 4 groups may contain halogen or other substituents, an example being trifluoropropyl.
  • groups not suitable as R 4 and R 5 groups are basic groups, such as amino, substituted amino and alkylamino.
  • cyclodextrins may be used in connection with the present invention.
  • those described and claimed in U.S. Pat. No. 5,312,864 (Wenz), the disclosure of which is hereby expressly incorporated herein by reference, as hydroxyl group derivatives of an ⁇ , ⁇ or ⁇ -cyclodextrin which is at least partly soluble in the cyanoacrylate would be appropriate choices for use herein as the first accelerator component.
  • poly(ethylene glycol) di(meth)acrylates suitable for use herein include those within the following structure:
  • n is greater than 3, such as within the range of 3 to 12, with n being 9 as particularly desirable. More specific examples include PEG 200 DMA, (where n is about 4) PEG 400 DMA (where n is about 9), PEG 600 DMA (where n is about 14), and PEG 800 DMA (where n is about 19), where the number (e.g., 400) represents the average molecular weight of the glycol portion of the molecule, excluding the two methacrylate groups, expressed as grams/mole (i.e., 400 g/mol).
  • a particularly desirable PEG DMA is PEG 400 DMA.
  • ethoxylated hydric compounds or ethoxylated fatty alcohols that may be employed
  • appropriate ones may be chosen from those within the following structure:
  • C m can be a linear or branched alkyl or alkenyl chain
  • m is an integer between 1 to 30, such as from 5 to 20
  • n is an integer between 2 to 30, such as from 5 to 15, and R may be H or alkyl, such as C 1-6 alkyl.
  • DEHYDOL 100 Commercially available examples of materials within the above structure include those offered under the DEHYDOL tradename from Henkel KGaA, Dusseldorf, Germany, such as DEHYDOL 100.
  • the accelerator embraced by the above structures should be included in the compositions in an amount within the range of from about 0.01% to about 10% by weight, with the range of about 0.1 to about 0.5% by weight being desirable, and about 0.4% by weight of the total composition being particularly desirable.
  • a stabilizer package is also ordinarily found in cyanoacrylate compositions.
  • the stabilizer package may include one or more free radical stabilizers and anionic stabilizers, each of the identity and amount of which are well known to those of ordinary skill in the art. See e.g. U.S. Pat. Nos. 5,530,037 and 6,607,632, the disclosures of each of which are hereby incorporated herein by reference.
  • additives may be included in the inventive rubber toughened cyanoacrylate compositions to confer additional physical properties, such as improved shock resistance, thickness (for instance, polymethyl methacrylate), thixotropy (for instance fumed silica), color, and enhanced resistance to thermal degradation
  • maleimide compounds such as N,N′-meta-phenylene bismaleimide (see U.S. Pat. No. 3,988,299 (Malofsky)
  • certain mono, poly or hetero aromatic compounds characterized by at least three substitutions on an aromatic ring thereof, two or more of which being electron withdrawing groups U.S. Pat. No. 5,288,794 (Attarwala)
  • certain quinoid compounds U.S. Pat. No.
  • alkylating agents such as polyvinyl benzyl chloride, 4-nitrobenzyl chloride, and combinations thereof, silylating agents, and combinations thereof (U.S. Pat. No. 6,093,780 (Attarwala)), the disclosures of each of which are hereby incorporated herein by reference].
  • Such additives therefore may be selected from certain acidic materials (like citric acid), thixotropy or gelling agents, thickeners, dyes, thermal degradation resistance enhancers, and combinations thereof. See e.g. U.S. patent application Ser. No. 11/119,703 and U.S. Pat. Nos. 5,306,752, 5,424,344 and 6,835,789, the disclosures of each of which are hereby incorporated herein by reference.
  • additives may be used in the inventive compositions individually in an amount from about 0.05% to about 20%, such as about 1% to 15%, desirably 5% to 10% by weight, depending of course on the identity of the additive.
  • citric acid may be used in the inventive compositions in an amount of 5 to 500 ppm, desirably 10 to 100 ppm.
  • a particularly desirable additive package for use in the invention toughened cyanoacrylate compositions includes the combination of two or more of citric acid, phthalic anhydride and crown ether, desirably all three. See below Example 6, Tables 12 and 13.
  • the rubber toughening component should be used in amount within the range of about 3% to about 20% by weight of the composition, with about 5% to about 15% by weight of the total composition being desirable.
  • the balance of the composition is composed predominantly of a cyanoacrylate component, such as ethyl-2-cyanoacrylate. Of course, the amount of all the components together in the composition totals 100%.
  • a method of bonding together two substrates which method includes applying to at least, one of the substrates a composition as described above, and thereafter mating together the substrates for a time sufficient to permit the adhesive to fixture.
  • the substrate should become fixed by the inventive compositions in less than about 150 seconds, and depending on the substrate as little as about 30 seconds.
  • the inventive composition should develop shear strength on the substrates between which they have been applied, as well as side impact strength and fracture toughness.
  • a source of radiation emitting electromagnetic waves is used to effect, cure and may be selected from ultraviolet light, visible light, electron beam, x-rays, infrared radiation and combinations thereof.
  • ultraviolet light is the radiation of choice, with appropriate sources including “H”, “D”, “V”, “X”, “M” and “A” lamps, mercury arc lamps, and xenon arc lamps (such as those commercially available from Henkel Corporation, Rocky Hill, Conn., Fusion UV Curing Systems, Buffalo Grove, Ill. or Spectroline, Westbury, N.Y.); microwave-generated ultraviolet radiation; solar power and fluorescent light sources.
  • any of these electromagnetic radiation sources may use in conjunction therewith reflectors and/or filters, so as to focus the emitted radiation onto a specific portion of a substrate onto which has been dispensed a photocurable composition and/or within a particular region of the electromagnetic spectrum.
  • the electromagnetic radiation may be generated directly in a steady fashion or in an intermittent fashion so as to minimize the degree of heat build-up.
  • the electromagnetic radiation employed to cure the photocurable compositions into desired reaction products is often referred to herein as being in the ultraviolet region, that is not to say that other radiation within the electromagnetic spectrum may not also be suitable.
  • radiation in the visible region of the electromagnetic spectrum may also be advantageously-employed, whether alone or in combination with, for instance, radiation in the ultraviolet region.
  • microwave and infrared radiation may also be advantageously employed under appropriate conditions.
  • the chosen lamp should have a power rating of at least about 100 watts per inch (about 40 watts per cm), with a power rating of at least about 300-watts per inch (about 120 watts per cm) being particularly desirable.
  • a photoinitiator in the composition may shift the wavelength within the electromagnetic radiation spectrum at which cure occurs, it may be desirable to use a source of electromagnetic radiation whose variables (e.g., wavelength, distance, and the like) are readily adjustable.
  • the inventive composition may be exposed to a source of electromagnetic radiation that emits an amount of energy, measured in KJ/m 2 , determined by parameters including: the size, type and geometry of the source; the duration of the exposure to electromagnetic radiation; the intensity of the radiation (and that portion of radiation emitted within the region appropriate to effect curing); the absorbency of electromagnetic radiation by any intervening materials, such as substrates; and the distance the composition lies from the source of radiation.
  • a source of electromagnetic radiation that emits an amount of energy, measured in KJ/m 2 , determined by parameters including: the size, type and geometry of the source; the duration of the exposure to electromagnetic radiation; the intensity of the radiation (and that portion of radiation emitted within the region appropriate to effect curing); the absorbency of electromagnetic radiation by any intervening materials, such as substrates; and the distance the composition lies from the source of radiation.
  • UV curing systems such as the “ZETA” 7200 or 7400 ultraviolet curing chamber (Henkel Corporation, Rocky Hill, Conn.), Fusion UV Curing Systems F-300 B (Fusion UV Curing Systems, Buffalo Grove, Ill.), Hanovia UV Curing System (Hanovia Corp., Newark, N.J.), BlackLight Model B-100 (Spectroline, Westbury, N.Y.) and RC500 A Pulsed UV Curing System (Xenon Corp., Woburn, Mass.), are well-suited for the purposes described herein. Also, a Sunlighter UV chamber fitted with low intensity mercury vapor lamps and a turntable may be employed herein.
  • reaction products of the so-described compositions there is provided reaction products of the so-described compositions.
  • a method of preparing the so-described compositions includes providing a cyanoacrylate component, and combining therewith mixing a rubber toughening agent.
  • a method of conferring one or more of the following properties to rubber toughened cyanoacrylate compositions improved fixture speed, improved shear strength development over time, and improved fracture toughness which method includes the steps of providing a cyanoacrylate composition, providing a rubber toughening agent of (a) reaction products of the combination of ethylene, methyl acrylate and monomers having carboxylic acid cure sites, (b) dipolymers of ethylene and methyl acrylate, and combinations thereof, and being substantially free of processing acids and/or anti-oxidants, and mixing together the cyanoacrylate compositions and rubber toughening agents.
  • Sample A-E A number of samples were evaluated for their fixture speeds on a variety of substrates and shelf lives under accelerated aging conditions.
  • Sample Nos. 1-9 were prepared by mixing together the noted constituents for a sufficient period of time to ensure substantial homogeneity of the constituents. Ordinarily, about 30 minutes should suffice, depending of course on the quantity of the constituents used.
  • the constituents and amounts of LOCTITE BLACK MAX 380 (Sample A), LOCTITE 4203 (Sample B), LOCTITE 4204 (Sample C), LOCTITE 4205 (Sample D), LOCTITE BLACK MAX 480 (Sample E), and Sample Nos. 1, 2 and 3 are given in Tables 1a and 1b; Sample Nos. 4-6 are given in Table 1c; and Sample Nos. 7-9 are given in Table Id.
  • Samples B-D also contain phthalic anhydride, ethylene sulfite and bismaleimide (at a level of 1-5 weight percent). Samples A and E also contain phthalic anhydride,
  • the fixture speed is the time from joining the two substrates (each of which being about 1 inch wide and being aligned with about a 0.5 inch overlap) sufficient to hold a 3 kg weight.
  • the lap shear strength was measured using 1′′ ⁇ 4′′ ⁇ 1 ⁇ 8′′ metal or plastic substrates, with a 0.5 square inch overlap of the substrates, and the cyanoacrylate sample between the substrate overlap.
  • the cyanoacrylate sample was allowed to cure at room temperature for the time interval as noted in Tables 2b-2d.
  • the resulting bond strength was measured using an Instron instrument.
  • the side impact strength was measured using 1′′ ⁇ 4′′ ⁇ 1 ⁇ 8′′ metal substrates, with a 1 square inch overlap of the substrates, and the cyanoacrylate sample between the substrate overlap.
  • the cyanoacrylate sample was allowed to cure at room temperature for the time interval as noted in Tables 2b-2d.
  • the assembly was then tested using a pendulum impact test fixture to destructively determine the side impact strength.
  • the fracture toughness was measured according to ASTM 799 by using tapered double cantilever beams (“DCBs”) constructed from, metallic materials. Cyanoacrylate samples were applied between DCBs with a 0 or 5 mil gap, and cured at room temperature for 8 days. Fracture toughness was measured after that time.
  • DCBs tapered double cantilever beams
  • FIGS. 1-3 for a graphic representation of the lap shear strength on aluminum ( FIG. 1 ) and on steel ( FIG. 2 ), and block shear strength on PVC ( FIG. 3 ).
  • VAMAC-brand rubbers VMX 1012, VCS 5500 and VCS 5520
  • VMX 1012 VMX 1012
  • VCS 5520 ethyl cyanoacrylate monomer
  • VAMAC G and VAMAC B-124 commercially available ones
  • Table 3 VMX 1012 and VCS 5520 are substantially free of processing aids such as the release agents octadecyl amine, complex organic phosphate esters and/or stearic acid, and anti-oxidants, such as substituted diphenyl amine.
  • VMX 1012 is free of acid cure sites, and VCS 5520 is believed to contain about half the amount of total acid cure sites found in VAMAC G and B-124.
  • VAMAC-brand rubbers identified in Table 3 were each mixed with ethyl cyanoacrylate monomer in the presence of BF 3 as the stabilizer, as shown in Table 4 to form Sample Nos. 10-11.
  • VAMAC-brand rubbers VMX 1012 and VCS 5520
  • VMX 1012 and VCS 5520 were dissolved in ethyl cyanoacrylate monomer to formulate cyanoacrylate compositions for a comparison to LOCTITE PRISM 480 (Sample E) as a control.
  • Table 6 shows the formulation constituents of each sample.
  • VAMAC-brand rubbers VAMAC VMX 1012 and VCS 5520, were dissolved in ethyl cyanoacrylate monomer to formulate cyanoacrylate compositions for a comparison to LOCTITE PRISM 480 and LOCTITE FLASHCURE 4305, as controls.
  • Table 8 below shows the formulation constituents of each sample.
  • Photoinitiators IRGACURE 819 and DAROCUR 1173 from Ciba Specialty Chemicals, as well as LUCIRIN TPO-L from BASF—and a metallalocene component—ferrocene (at a level of 100 ppm)—were used in the compositions in this example, and BF 3 was used as a stabilizer.
  • the VAMAC rubbers along with other ingredients (see below Table 8) were mixed with ethyl cyanoacrylate for about 30 minutes to form a substantial homogeneous composition.
  • fracture toughness was evaluated for a radiation curable cyanoacrylate composition toughened in accordance with the present invention.
  • Sample No. 20 An evaluation of Sample No. 20 was performed in accordance with ASTM D5045 (the substance of which is hereby incorporated herein by reference) using three-point bend specimen geometry.
  • the mold used to prepare the sample for evaluation is constructed from, glass, with a Teflon film placed therewithin.
  • the glass mold is transmissive to UV radiation to permit curing of the sample by exposure to such radiation.
  • the Teflon permits the film formed after exposure to be removed in a self supporting manner.
  • the mold with the sample within was exposed to UV radiation at an intensity of 30 mW/cm 2 at 365 nm for about 1-2 minutes for each side.
  • Table 11 below presents the G q (critical strain energy release rate) and K q (plane-strain fracture toughness) values obtained from that evaluation.
  • Sample Nos. 21-27 were prepared with VAMAC VCS 5500 as the rubber toughening component, together with various additives, as shown below in Table 12.
  • Table 13 below shows the results of certain evaluations made on Sample Nos. 21-27. For instance, side impact and lap shear data are recorded in the table.
  • the lap shear data for Sample No. 27 was obtained from a sample with 2 ppm BF 3 , instead of 5 ppm as was used for the side impact data.

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HUE029799T2 (en) 2017-04-28
JP2009500517A (ja) 2009-01-08

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