EP1337589A2 - Elastomeres de silicone moulables presentant une adhesivite selective sans primaire - Google Patents

Elastomeres de silicone moulables presentant une adhesivite selective sans primaire

Info

Publication number
EP1337589A2
EP1337589A2 EP01989788A EP01989788A EP1337589A2 EP 1337589 A2 EP1337589 A2 EP 1337589A2 EP 01989788 A EP01989788 A EP 01989788A EP 01989788 A EP01989788 A EP 01989788A EP 1337589 A2 EP1337589 A2 EP 1337589A2
Authority
EP
European Patent Office
Prior art keywords
composition
parts
weight
centipoises
organopolysiloxane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01989788A
Other languages
German (de)
English (en)
Inventor
Rick A. Ziebell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bryant Rubber Corp
Original Assignee
Bryant Rubber Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/715,963 external-priority patent/US6663967B1/en
Application filed by Bryant Rubber Corp filed Critical Bryant Rubber Corp
Publication of EP1337589A2 publication Critical patent/EP1337589A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C08G77/16—Polysiloxanes containing silicon bound to oxygen-containing groups to hydroxyl groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C08G77/18—Polysiloxanes containing silicon bound to oxygen-containing groups to alkoxy or aryloxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/70—Siloxanes defined by use of the MDTQ nomenclature

Definitions

  • the present invention relates both to a method for improving the primerless adhesion of cured silicone elastomers and to curable (and cured) high strength, organopolysiloxane molding compositions useful to produce cured silicone rubber articles that exhibit excellent adhesion to thermoplastic resins such as, but not limited to, PBT and PPA, while not significantly adhering to metal substrates.
  • Moldable primerless organopolysiloxane compositions are known and used.
  • One problem with all such compositions is that due to the adhesion additives in the compositions they also adhere to metal surfaces.
  • the typical mold is metal. It is difficult to selectively adhere to thermoplastic substrates without deleterious effects.
  • the kinetics and thermochemistry of the molding process and the compositions used in such processes are such that only small lightweight composite plastic and silicone elastomer articles of manufacture can be made by molding techniques because of the difficulty of removing the article from the metal mold.
  • Organopolysiloxane compositions useful for molding typically contain alkenyl polymers, fillers, and other additives.
  • the compositions contain a platinum catalyst, a hydride crosslinker and cure inhibitors. These can be one or two component systems that are mixed prior to the molding process. These heat cured (i.e. high consistency or millable rubber) or liquid injection molded silicone rubbers are commonly available without additives that improve adhesion.
  • Typical molding compositions generally include the following ingredients:
  • organohydrogenpolysiloxane crosslinker containing at least two silicon-bonded hydrogens per molecule and having a viscosity ranging from 80 to 1 ,000 centipoises at 25°C;
  • Additional components may include extending fillers, coloring agents, and additives to impart increased performance with respect to certain physical properties such as oil resistance, heat aging, abrasion resistance and the like.
  • the functional properties of the resulting rubber elastomer depend not only on the levels of components but also on the properties of the filler, additives, and type of curing catalyst. Consequently, the elastomer property profile is highly dependent on the chemical nature of the various constituent components as well as the relative proportions of those components. For example, a heat additive increases the temperature range of the resulting rubber. Such improvements however, do not necessarily increase the adhesion stability and some times fail to adhere after heat soak. ln seeking to increase the selective adhesion of silicone compositions to thermoplastic and thermoset substrates, it is frequently desirable to increase the ability of the silicone to be released from a mating part or surface for which the molded composite may come in contact.
  • a typical method of improving the lubricity of a silicone composition is simply to add a liquid component to the formulation that has limited solubility in the elastomer and thus the compound bleeds out over time.
  • a liquid component such as copolymers of polydimethylsiloxanes, diphenylsiloxane or methylphenylsiloxane, and fluorosiloxanes such as silicones containing trifluoropropyl substituted siloxanes.
  • a diorganopolysiloxane composition of soluble polydiorganosiloxanes, polycycloorganosiloxanes (linear and cyclic) and/or hydroxy end blocked hydrocarbons (glycols) of a specific molecular distribution preferably having a viscosity of 10 to 1 ,000 centipoises at 25°C; and an epoxy functional compound, thus giving release characteristics to metal substrates while maintaining adhesion to the thermoplastic substrate.
  • the preferred embodiment of the present invention provides for a curable silicone elastomer composition
  • a curable silicone elastomer composition comprising:
  • glycols examples include polyethylene glycol (e.g., PEG 400) and 1 ,3 butylene glycol PEG 400 is preferred.
  • the foregoing composition may also include a silicone soluble in the curable elastomer composition.
  • the silicone is less soluble in the curable elastomer composition when the curable composition has been cured. As a result, the silicone bleeds out of cured composition to improve lubricity.
  • the present invention provides a composition that selectively adheres to a substrate that may be a thermoset or a thermoplastic, but not to a metal such as aluminum or steel.
  • a substrate may be a thermoset or a thermoplastic, but not to a metal such as aluminum or steel.
  • the thermoset or thermoplastic substrates may be filled polymers with glass or clays.
  • the silicone compositions of the present invention release readily from metal substrates after they have been overmolded, transfer molded or injection molded.
  • the present invention further provides for the incorporation of an adhesion promoter and a self-bleed additive that allows lubrication of the surfaces of the cured silicone simultaneously with adhesion to the overmolded, transfer molded or injection molded substrate.
  • the formulations of the present invention demonstrate that compositions containing both an adhesion promoter and a self-bleed additive for lubricity can simultaneously achieve the contradictory goals of adhesion to a substrate used in overmolding, transfer or injection molding and release from a second substrate where the silicone was not bonded to the substrate by the action of the adhesion promoter and the co-molding process of overmolding, transfer molding or injection molding.
  • This invention utilizes the release characteristics of soluble polydiorganosiloxanes, polycycloorganosiloxanes (linear and cyclic), and/or hydroxy end blocked hydrocarbons (glycols) of specific molecular distribution preferably having viscosity of 10 to 1 ,000 centipoises at 25°C.
  • the two (2) additives that provide the selective adhesion properties are:
  • polybutylene glycols provide better release to metals during molding than poly-dimethyl siloxanes alone.
  • a silicone soluble in the curable elastomer composition can be added.
  • the silicone is selected such that it is less soluble in the curable elastomer composition when the curable composition has been cured. As a result, the silicone bleeds out of the cured composition.
  • one preferred embodiment of the present invention comprises a curable organopolysiloxane composition having selective adhesion to a metal substrate.
  • the composition should preferably include the following components:
  • (C) a catalytically effective amount of a platinum group metal catalyst; (D) from 0.01 to 3 parts by weight of a cure inhibitor, preferably of the type 4 or 5, ethyl cyclohexan-1 -ol;
  • G up to about 1 0 parts by weight based upon the total composition of soluble polydiorganosiloxanes, polycycloorganosiloxanes (linear and cyclic) and/or hydroxy end blocked hydrocarbons (glycols) of a specific molecular distribution having a viscosity of 50 to 1 ,000 centipoises at 25°C.
  • the organopolysiloxane polymer contains at least two silicon-bonded lower alkenyl groups in each molecule and is a straight chain organopolysiloxane having a viscosity of about 100,000 to about 10,000,000 centipoises at 25°C, or mixtures of such organopolysiloxanes, and the lower alkenyl groups are vinyl.
  • organopolysiloxanes include Dow Corning Q42901 and Q42903 gums, with an average pendant vinyl content ranging from .01 to .20 mole percent with .80 to .20 mole percent being preferable.
  • the organohydrogenpolysiloxane crosslinker has organic substituents bonded to silicon atoms, which are methyl, and the concentration of organohydrogenpolysiloxane provides about 0.2 to about 0.02 silicon-bonded hydrogen atoms for each silicon-bonded alkenyl radical in the organopolysiloxane polymer, and wherein the crosslinker has the formula:
  • each R is independently chosen from a hydrogen or monovalent hydrocarbon radical free of aliphatic unsaturation containing 1 to about 8 carbon atoms, and x varies so that the crosslinker has a viscosity ranging from about 80 to 1 ,000 centipoises at 25°C.
  • each R is independently chosen from as a methyl, ethyl, vinyl, hydroxy, propyl, and 3,3,3-trifluoropropyl, and/or a branch chain of polydiorganosiloxane group and is itself a straight chain where x is given to create a viscosity of 10,000 to 10,000,000 centipoises at 25° C.
  • cross linkers include Dow Corning 1 107 and 63570 cross- linkers with Dow Corning silbond 7608 being preferable.
  • the platinum group metal catalyst is selected from the group consisting of platinum metal, platinum compounds, platinum complexes and mixtures thereof.
  • the platinum group metal catalyst is chloroplatinic acid complexed with a liquid olefin or an organosiloxane containing ethylenically unsaturated hydrocarbon radicals bonded to silicon. More preferably, the platinum group metal catalyst is a neutralized complex of chloroplatinic acid or platinum dichloride with divinyltetramethyldisiloxane.
  • the platinum group metal catalyst provides about 0.1 to about 500 parts by weight platinum group metal per million parts of the combined weights of organopolysiloxane and organohydrogenpolysiloxane.
  • the platinum group metal catalyst provides about 1 to about 50 parts by weight platinum group metal per million parts of the combined weights of organopolysiloxane and organohydrogenpolysiloxane.
  • the cure inhibitor compound is an acetylene alcohol derivative such as ethenylcyclohexanol or pyradien alcohol having the following general formula:
  • R' is an alkyne unsaturated hydrocarbon chain, branched or unbranched, and R is a saturated hydrocarbon linear or cyclic with hydroxy groups pendant or end blocked with hydroxy saturation indicated by x, which is 1 to complete hydroxy saturation of the R group.
  • adhesion promoter is a hydroxinated silicone compound is of the formula:
  • R is any hydrocarbon alkyl or alkenyl radical linear or branched comprising not more than 1 0 carbon atoms
  • R' is any mixture of any alkyl, alkenyl, aliphatic, or aromatic radical, linear or branched, up to 1 2 carbon atoms
  • z is of sufficient number to create a viscosity of about 50 to about 1 0,000 centipoises at 25°C.
  • parts per weight are used. Examples include 1 -hydroxy 2,3 methyl end blocked vinylmethylsiloxane (DP 10 to 1 2 with 2 to 4 pendant vinyl groups) .
  • the epoxy-functional compound is of the formula:
  • RO refers to a saturated linear alkoxy group and R' is an alkane, substituted or unsubstituted
  • R" is an oxirynic derivative containing 6-1 5 carbon atoms.
  • this compound is glycidoxypropyltrimethoxysilane.
  • Others include methacrylvinylpolysilane, chlorotrimethoxysilane, vinyltrimethoxysilane, and divinyldimethoxysilane. In generally from .01 to 30, preferably from .05 to 1 .0 and more preferably from .10 to .60, parts by weight are used.
  • the polydiorganosiloxanes include Dow Corning 200 fluid.
  • Viscosity grades 50 to 200 are preferable and grades 50 to 10,000 in general.
  • An example of polycycloorganosiloxanes includes Dow Corning 244 fluid and other cyclic siloxanes from D4 to D10 (DP units), preferably D 4 and D5.
  • the molecular distribution should be such as to produce a viscosity at 25°C of 50 to 1 ,000, preferably 50 to 500 centipoises, and more preferably 50 to 200 centipoises.
  • the epoxy- functional compound is glycidoxypropyltrimethoxysilane.
  • the epoxy-functional compound comprises about 0.01 to 10 parts by weight per 100 weight parts of organopolysiloxane polymer.
  • composition according to the present invention can include a filler selected from the group consisting of fumed silica, treated fumed silica, precipitated silica, treated precipitated silica, fused silica, and finely divided quartz and mixtures thereof.
  • a composite is formed having bonded thereto a cured organopolysiloxane composition.
  • the composition preferably contains the following components:
  • G up to about 10 parts by weight based of a soluble polydiorganosiloxanes, polycycloorganosiloxanes (linear and cyclic) and/or hydroxy end blocked hydrocarbons (glycols); of a specific molecular distribution having a viscosity of 50 to 1 ,000 centipoises at 25°C.
  • a composite containing an epoxy-coated substrate having bonded thereto a cured organopolysiloxane composition is formed.
  • the composition preferably comprises:
  • G up to about 10 parts by weight based of a soluble polydiorganosiloxanes and polycycloorganosiloxanes (linear and cyclic) and/or hydroxy end blocked hydrocarbons (glycols) of specific molecular distribution having a viscosity of 50 to 1 ,000 centipoises at 25°C.
  • the substrate is metal.
  • the epoxy coating comprises chemistries used in cast, form in place, or vacuum bag cures. Moldable epoxy composites are preferable.
  • a silicone soluble in the curable elastomer composition is added.
  • the silicone is less soluble in the curable elastomer composition when the curable composition has been cured. In such case, the silicone bleeds out of the cured composition.
  • the silicone is selected from the following or mixtures thereof:
  • phenyl containing siloxanes such as copolymers of diphenylsiloxane with diorganosiloxanes and copolymers of methylphenylsiloxane with diorganosiloxanes, polydimethylsiloxanes, having a viscosity ranging between about 10 to about 10,000 centipoises at 25°C, preferably ranging from about 100 to about 1000 centipoises at 25°C; and
  • fluorosiloxanes such as silicones containing trifluoropropyl substituted siloxanes, having a viscosity ranging between 100 to about 10,000 centipoises at 25°C, preferably ranging from about 100 to about 1000 centipoises at 25°C.
  • Examples of the foregoing include phenyl siloxanes commonly sold as Dow Corning 550 Fluid or GE SF-1 1 54 and those for fluorosiloxanes FS-149, FS1 50-10M FS1 57 all of various viscosities and purity grades. These components lubricate without adversely affecting the adhesion of the composition to a substrate.
  • the resins to which the cured inventive composition can be bonded include Nylon, polyphenylene, polyphthalamide, polyphenylene ether, polyamide and polyimid thermoplastic resins that may or may not be glass filled, mineral filled, or carbon filled.
  • thermoset resins such as epoxy, silicone or others that are manufactured by coating a substrate or by direct casting can be bonded to the cured organopolysiloxane composition in of the present invention.
  • the resin is PBA or PBT.
  • Additional components may include extending fillers, coloring agents, and additives to impart increased performance with respect to certain physical properties such as oil resistance, heat aging, abrasion resistance and the like.
  • compositions have selective adhesion to polymer substrates and do not have significant adhesion to metal surfaces.
  • the significance of selective adhesion preferably is such that the adhesion to metal in general is such that the composition sticks to a resin or epoxy coated substrate, but not to metal.
  • the adhesion to metal is less than half the adhesion to the target polymer substrate and more preferably has no cohesion failure to the metal as determined by lap shear testing.
  • Curable silicone rubber compositions were prepared from a high consistency silicone rubber base. Adhesion components E through G were added in amounts shown in Table 1 . Samples of these materials were made by curing the composition at 1 50° C for 3 minutes. These samples were tested per ASTM D81 6. The results are listed in Table 1 . Table 1
  • Adhesion Components % cohesion failure to listed substrate
  • Component E - adhesion promoter Glycidoxypropyltrimethoxysilane
  • Component F - epoxy functional compound Hydroxyl End Blocked, specifically Polydimethylvinylsiloxane
  • Component G - Polydioganosiloxane Polydimethylsiloxane 100CS
  • Example Runs 1 -8 show additions of adhesion promoting compounds.
  • Example Run 9 shows that addition of polymethylphenylsiloxane as a lubricant does not deleteriously affect adhesion.
  • Table 2 demonstrates that, as in High Consistency Rubber (“HCR”) HCR, Liquid Silicone Rubber (“LSR”) has improved adhesion by addition of components E and F.
  • HCR High Consistency Rubber
  • LSR Liquid Silicone Rubber
  • addition of component G and H in combination with component E and F maintains adhesion to plastic but does not adhere significantly to steel.
  • the composition is said to be a selective adhesion promoting material with good adhesion to thermoplastics and thermosets yet not to metal surfaces and can be self lubricating.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne des compositions d'organopolysiloxane qui durcissent sous l'effet de la réaction d'addition de radicaux d'alcényle inférieur à liaison silicium avec des atomes d'hydrogène à liaison silicium et qui présentent une adhésivité sélective sur différents substrats. Ces compositions contiennent un mélange stimulant l'adhésion constitué d'un composé à fonction époxy, de polydiorganosiloxanes solubles, de polycycloorganosiloxanes (linéaires et cycliques) et d'hydrocarbures à extrémité bloc hydroxy (glycols), conférant ainsi des caractéristiques de libération à des substrats métalliques tout en conservant les caractéristiques d'adhésion à un substrat thermoplastique. Un additif peut en outre être utilisé afin de conférer à ces compositions un pouvoir lubrifiant de surface après le durcissement.
EP01989788A 2000-11-17 2001-11-19 Elastomeres de silicone moulables presentant une adhesivite selective sans primaire Withdrawn EP1337589A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US09/715,963 US6663967B1 (en) 2000-11-17 2000-11-17 Moldable silicone elastomers having selective primerless adhesion
US715963 2000-11-17
PCT/US2001/044668 WO2002040592A2 (fr) 2000-11-17 2001-11-19 Elastomeres de silicone moulables presentant une adhesivite selective sans primaire
US09/997,473 US6783858B2 (en) 2000-11-17 2001-11-19 Moldable silicone elastomers having selective primerless adhesion
US997473 2001-11-19

Publications (1)

Publication Number Publication Date
EP1337589A2 true EP1337589A2 (fr) 2003-08-27

Family

ID=27109447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01989788A Withdrawn EP1337589A2 (fr) 2000-11-17 2001-11-19 Elastomeres de silicone moulables presentant une adhesivite selective sans primaire

Country Status (2)

Country Link
EP (1) EP1337589A2 (fr)
WO (1) WO2002040592A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4107227A4 (fr) 2020-02-17 2023-11-22 Dow Silicones Corporation Matériaux de silicone élastomère et leurs applications

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3011617B2 (ja) * 1994-08-11 2000-02-21 信越化学工業株式会社 シリコーン−エポキシ樹脂組成物
TW296401B (fr) * 1994-12-26 1997-01-21 Shinetsu Chem Ind Co
TW334469B (en) * 1995-08-04 1998-06-21 Doconitele Silicon Kk Curable organosiloxane compositions and semiconductor devices
JP3144290B2 (ja) * 1995-12-15 2001-03-12 三菱エンジニアリングプラスチックス株式会社 熱可塑性樹脂とオイルブリード性シリコーンゴムとの一体成形体
DE69725114D1 (de) * 1996-07-08 2003-10-30 Ge Toshiba Silicones Co Verfahren zur herstellung von gemusterten formmassen aus silikonkautschuk
JP3511127B2 (ja) * 1997-11-05 2004-03-29 信越化学工業株式会社 接着性シリコーン組成物

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0240592A3 *

Also Published As

Publication number Publication date
WO2002040592A3 (fr) 2002-10-03
WO2002040592A2 (fr) 2002-05-23
WO2002040592A8 (fr) 2002-11-21

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