Classifications

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  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
  • C08L71/02—Polyalkylene oxides
• • 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
  • C09J183/00—Adhesives based on 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; Adhesives based on derivatives of such polymers
  • C09J183/04—Polysiloxanes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/0208—Tissues; Wipes; Patches
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/86—Polyethers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
  • A61K8/84—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
  • A61K8/89—Polysiloxanes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
  • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
  • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
  • A61L15/225—Mixtures of macromolecular compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L24/00—Surgical adhesives or cements; Adhesives for colostomy devices
  • A61L24/04—Surgical adhesives or cements; Adhesives for colostomy devices containing macromolecular materials
  • A61L24/046—Surgical adhesives or cements; Adhesives for colostomy devices containing macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
  • A61L31/04—Macromolecular materials
  • A61L31/06—Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q19/00—Preparations for care of the skin
• • 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
  • C08K5/0091—Complexes with metal-heteroatom-bonds
• • 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
  • C08K5/54—Silicon-containing compounds
  • C08K5/541—Silicon-containing compounds containing oxygen
  • C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
  • C08K5/5419—Silicon-containing compounds containing oxygen containing at least one Si—O bond containing at least one Si—C bond
• • 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
  • 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
  • C08L83/14—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 in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
• • 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
  • C09J183/00—Adhesives based on 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; Adhesives based on derivatives of such polymers
  • C09J183/14—Adhesives based on 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; Adhesives based on derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
• • 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
  • C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/10—General cosmetic use
• • 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
  • C08G77/48—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 in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
  • C08G77/50—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 in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms by carbon linkages
• • 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
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
  • C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
• • 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
  • C09J2471/00—Presence of polyether
• • 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
  • C09J2483/00—Presence of polysiloxane

Definitions

• This relates to silicone room temperature curable sealant/adhesive compositions, in particular such compositions which (upon several hours of contact with water) do not repel water, but rather retain and pick-up water and/or can be wetted by aqueous materials subsequent to exposure.
• cured silicone materials are substantially hydrophobic and have low surface energy surfaces. Some of their most important uses, e.g. as sealants and/or caulks utilise these physical properties as they e.g. require minimal if any water ingress.
• Silicone room temperature curable sealant/adhesive compositions may generate vapour permeable elastomeric materials which can be formulated to be both inert to the skin and provide adhesion to skin, e.g. in the form of pressure sensitive adhesives. Such materials have a wide range of applications including (without being restricted to) medical adhesives, wound care coatings/pads, skin care and ostomy care.
• EP0315333 describes mouldable elastomeric pressure sensitive adhesive compositions and their preparation, particularly solventless, mouldable compositions which can be moulded and cured at room temperature and which are useful for making medical adhesives.
• WO2015/082877 describes skin compatible curing adhesives for adhering devices or appliances to the mammalian body.
• sealant/adhesive compositions and resulting cured elastomers which do not repel water, but rather retain and pick-up water and/or can be wetted by aqueous materials subsequent to exposure.
• a silicone room temperature curable sealant/adhesive composition comprising,
• each R is free of aliphatic unsaturation and is selected from the group consisting of monovalent hydrocarbon, monovalent halohydrocarbon, and monovalent cyanoalkyl radicals of 1 to 18 inclusive carbon atoms
• each R" is a monovalent hydrocarbon group having 1 to 6 carbon atoms
• Z is a divalent hydrocarbon radical or combination of divalent hydrocarbon radicals and siloxane radicals
• a is 0 or 1
• x is of a value such that the polymer has a viscosity of from 0.5 to 3000 Pa.s at 25°C; ,
• each R is free of aliphatic unsaturation and is selected from the group consisting of monovalent hydrocarbon, monovalent halohydrocarbon, and monovalent cyanoalkyi radicals of 1 to 18 inclusive carbon atoms
• b is 0, 1 or 2
• y is of a value such that the polymer has a viscosity of from 0.5 to 3000
• cross-linker selected from a silane or siloxane cross linker containing at least 2 but typically 3 or more alkoxy or alkenyloxy groups, or silyl functional molecules having at least 2 silyl groups, each silyl group containing at least one alkoxy or alkenyloxy group.
• plasticisers plasticisers, adhesion promoters, compatibilizer', pigments, heat stabilizers, flame retardants, UV stabilizers, chain extenders, electrically and/or heat conductive fillers, and/or fungicides/biocides; wherein the total % weight of A + B + C + D + E is 100%.
• Component A) is 50-95% by weight of one or more organopolysiloxanes selected from A) i, A) ii or A) iii as described above.
• A) i is an organopolysiloxane of the structure:
• each R is free of aliphatic unsaturation and is selected from the group consisting of monovalent hydrocarbon, monovalent halohydrocarbon, and monovalent cyanoalkyi radicals of in each case 1 to 18 inclusive carbon atoms alternatively in each case 1 to 10 carbon atoms, further
• each R" is a monovalent hydrocarbon group having 1 to 6 carbon atoms alternatively is methyl, ethyl, propyl, or butyl
• Z is a divalent hydrocarbon radical, alternatively a divalent hydrocarbon radical having from 1 to 10 carbon atoms, or further alternatively 1 to 6 carbon atoms or a combination of said divalent hydrocarbon radicals and divalent siloxane radicals
• a is 0 or 1
• x is of a value such that the polymer has a viscosity of from 0.5 to 3000 Pa.s at 25°C; (Viscosity measurement were measured using a suitable Brookfield viscometer).
• A) ii is an alpha, omega-diorganopolysiloxane of the formula
• each R is free of aliphatic unsaturation and is selected from the group consisting of monovalent hydrocarbon, monovalent halohydrocarbon, and monovalent cyanoalkyl radicals of in each case 1 to 18 inclusive carbon atoms, alternatively in each case 1 to 10 carbon atoms, further alternatively in each case 1 to 6 carbon atoms such as methyl, ethyl, propyl, or butyl, b is 0, 1 or 2, and y is of a value such that the polymer has a viscosity of from 0.5 to 3000 Pa.s at 25°C and a number average molecular weight (M n ) of from 1000 to 1000000 ; or
• A) iii are mixtures of A) i and A)ii.
• the mixture may be in a ratio of A) i to A)ii of from 10:1 to 1 :10.
• Component B in the composition comprises from 5-35 % by weight of the composition of a hydrophilic material.
• the hydrophilic, material may be B) (i) which are hydrophilic and/or water soluble polyoxyalkylene resins and/or polymers.
• polyoxyalkylene compounds preferably comprise predominantly oxyalkylene polymer comprised of recurring oxyalkylene units, (-C n H 2 n-0-) illustrated by the average formula (- CnH 2 n-0-) y wherein n is an integer from 2 to 4 inclusive and y is an integer of at least four.
• the oxyalkylene units are not necessarily identical throughout the
• polyoxyalkylene monomer can differ from unit to unit.
• a polyoxyalkylene for example, can be comprised of oxyethylene units (-C2H4-O-), oxypropylene units (-C 3 H 6 -0-) or oxybutylene units (-C 4 H 8 -0-); or mixtures thereof.
• the number average molecular weight of each polyoxyalkylene polymer may range from about 300 to tens of millions.
• high number average molecular weight polymers/resins e.g. > 50 000, alternatively > 75 000, alternatively, 75 000 to 20 000 000, alternatively 75 000 to 10 000 000 may be used.
• the number average molecular weight is the total weight of the sample divided by the number of molecules in the sample and was determined by gel permeation chromatography (GPC) using a triple detection capability (Viscotek TDA305 unit) composed of a differential refractometer, an online differential pressure viscometer and low angle light scattering (LALS: 7° and 90° angles of detection).
• the hydrophilic material may be B) (ii) anionic surfactants such as
• alkyl groups generally have a total of from about 12 to 21 carbon atoms, may be unsaturated, and are preferably fatty alkyl groups.
• the sulphates may be sulphate ethers containing one to ten ethylene oxide or propylene oxide units per molecule.
• the sulphate ethers contain 2 to 3 ethylene oxide units.
• Typical anionic surfactants include, among others, sodium lauryl sulphate, sodium lauryl ether sulphate, ammonium lauryl sulphate, triethanolamine lauryl sulphate, sodium C14-16 olefin sulphonate, ammonium pareth-25 sulphate (ammonium salt of a sulphated polyethylene glycol ether of a mixture of synthetic C12-15 fatty alcohols), sodium myristyl ether sulphate, ammonium lauryl ether sulphate, disodium monooleamidosulphosuccinate, ammonium lauryl sulphosuccinate, sodium dodecylbenzene sulphonate, triethanolamine dodecylbenzene sulphonate and sodium N-lauroyl sarcosinate.
• the lauryl sulphates include monoethanolamine, triethanolamine, ammonium and sodium lauryl sulphates.
• anionic surfactants include alkali metal sulphoricinates, sulphonated glyceryl esters of fatty acids such as sulphonated monoglycerides of coconut oil acids, salts of sulphonated monovalent alcohol esters such as sodium oleylisethianate, amides of amino sulphonic acids such as the sodium salt of oleyl methyl tauride, sulphonated products of fatty acids nitriles such as palmitonitrile sulphonate, sulphonated aromatic hydrocarbons such as sodium alpha-naphthalene monosulphonate, condensation products of naphthalene sulphonic acids with formaldehyde, sodium octahydroanthracene sulphonate, alkylbenzenesulphonic acid alkali metal salts exemplified by hexylbenzenesulphonic acid sodium salt, octylbenzenesulphonic acid sodium salt, de
• the hydrophilic material may be B) (iii) which are polymers containing ionizable groups, e.g. pendent sulphonate groups, acetate groups, sulphate groups. Examples include but are not limited to homopolymers and copolymers comprising vinylsulphonic, styrenesulphonic, naphthalenesulphonic or acrylamidoalkylsulphonic units and their salts. Polyvinylsulphonic acid salts may include those having a molecular weight of
• Component B in the composition may also comprise any suitable mixture of B) (i) and/or B) (ii) and B) (iii) in any suitable amount.
• Component C is a suitable cross linker containing at least 2 but typically 3 or more alkoxy or alkenyloxy groups.
• Any suitable alkoxy type or alkenoxy type cross-linker may be used. These include one or more silanes or siloxanes which contain silicon bonded alkoxy groups such as methoxy, ethoxy or propoxy groups and silicon bonded alkenyloxy groups (for example isopropenyloxy and 1 -ethyl-2-methylvinyloxy).
• Another type of cross-linker that might be used are silyl functional molecules having at least 2 silyl groups, each silyl group containing at least one hydrolysable group.
• the molecular structure can be straight chained, branched, or cyclic.
• the crosslinkers (C) may have two but preferably has three or four silicon-bonded alkoxy and/or alkenyloxy groups per molecule which are reactive with the condensable groups in organopolysiloxane polymer (A).
• the fourth group is suitably a non-hydrolysable silicon-bonded organic group.
• These silicon-bonded organic groups are suitably hydrocarbyl groups which are optionally substituted by halogen such as fluorine and chlorine. Examples of such fourth groups include alkyl groups (for example methyl, ethyl, propyl, and butyl); cycloalkyl groups (for example cyclopentyl and
• the fourth silicon-bonded organic groups is methyl.
• Silanes which can be used as crosslinkers include alkyltrialkoxysilanes such as methyltrimethoxysilane (MTM) and methyltriethoxysilane, alkenyltrialkoxy silanes such as vinyltrimethoxysilane and vinyltriethoxysilane, isobutyltrimethoxysilane (iBTM).
• alkyltrialkoxysilanes such as methyltrimethoxysilane (MTM) and methyltriethoxysilane
• alkenyltrialkoxy silanes such as vinyltrimethoxysilane and vinyltriethoxysilane
• iBTM isobutyltrimethoxysilane
• Other suitable silanes include ethyltrimethoxysilane, vinyltriethoxysilane, phenyltrimethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, phenyl-tripropion
• methyltris(isopropenoxy)silane vinyltris(isopropenoxy)silane, ethylpolysilicate, n- propylorthosilicate, ethylorthosilicate, or any combination of two or more of the above.
• a typical silane may be described by R"4- r Si(OR 5 ) r wherein R 5 is an alkyl group having from 1 to 6 carbon atoms and r has a value of 2, 3 or 4.
• R" is an organic radical selected from linear and branched alkyls, allyls, phenyl and substituted phenyls.
• Typical silanes are those wherein R" represents methyl, ethyl or vinyl or isobutyl. In some instances, R 5 represents methyl or ethyl and r is 3.
• crosslinkers (ii) are molecules of the type Si(OR 5 )4 where R 5 is an alkyl group having from 1 to 6 carbon atoms, alternatively propyl, ethyl or methyl. Partials condensates of Si(OR 5 )4 may also be considered.
• Crosslinkers (C) may comprise the here before described silyl functional molecules having at least 2 silyl groups, each silyl group containing at least one hydrolysable group.
• silyl functional molecule is a silyl functional molecule containing two or more silyl groups, each silyl group containing at least one hydrolysable group.
• a disilyl functional molecule comprises two silicon atoms each having at least one hydrolysable group, where the silicon atoms are separated by an organic or siloxane spacer.
• the silyl groups on the disilyl functional molecule may be terminal groups.
• the spacer may be a polymeric chain.
• the crosslinker C) may be a disilyl functional polymer, that is, a polymer containing two silyl groups, each containing at least one hydrolysable group such as described by R" 3 y Si(OR 5 ) y -Rv - Si(OR 5 ) z RVz where R" and R 5 are as described above, y and z are independently an integer of 1 , 2 or 3, alternatively 2 or 3.
• Rv is a divalent hydrocarbon radical, alternatively a divalent hydrocarbon radical having from 1 to 10 carbon atoms, or further alternatively 1 to 6 carbon atoms or a combination of said divalent hydrocarbon radicals and divalent siloxane radicals.
• the silyl (e.g. disilyl) functional crosslinker may have a siloxane or organic polymeric backbone.
• siloxane or organic based cross-linkers the molecular structure can be straight chained, branched, cyclic or macromolecular.
• the viscosity of the cross-linker will be within the range of from 0.5 mPa.s to 80,000 mPa.s at 25°C.
• Examples of disilyl polymeric crosslinkers (ii) with a silicone or organic polymer chain bearing alkoxy functional end groups include polydimethylsiloxanes having at least one trialkoxy terminal where the alkoxy group may be a methoxy or ethoxy group.
• Examples might include or 1 ,6-bis(trimethoxy silyl)hexane hexamethoxydisiloxane, hexaethoxydisiloxane, hexa-n-propoxydisiloxane, hexa-n-butoxydisiloxane,
• the composition herein additionally includes component D 0.5-5% by weight of a titanate or zirconate catalyst.
• Titanate and/or zirconate based catalysts may comprise a compound according to the general formula Ti[OR 22 ]4 where each R 22 may be the same or different and represents a monovalent, primary, secondary or tertiary aliphatic hydrocarbon group which may be linear or branched containing from 1 to 10 carbon atoms.
• the titanate may contain partially unsaturated groups.
• R 22 examples include but are not restricted to methyl, ethyl, propyl, isopropyl, butyl, tertiary butyl and a branched secondary alkyl group such as 2,4-dimethyl-3-pentyl.
• R 22 is an isopropyl, branched secondary alkyl group or a tertiary alkyl group, in particular, tertiary butyl.
• the titanate may be chelated.
• the chelation may be with any suitable chelating agent such as an alkyl acetylacetonate such as methyl or ethylacetylacetonate.
• compositions as described above may contain, as optional ingredients E), which are conventional to the formulation of silicone rubber sealants and the like.
• the compositions may contain one or more finely divided, reinforcing fillers such as high surface area fumed and precipitated silicas including rice hull ash, commercial examples include for the sake of example AEROSIL® R 974 and AEROSIL® R 812. from Evonik, and to a degree calcium carbonate , or additional non-reinforcing fillers such as crushed quartz, diatomaceous earths, barium sulphate, iron oxide, zeolites e.g. Zeolite 4A, titanium dioxide and carbon black, talc, wollastonite.
• fillers which might be used alone or in addition to the above include aluminite, calcium sulphate (anhydrite), gypsum, calcium sulphate, magnesium carbonate, clays such as kaolin, aluminium trihydroxide, magnesium hydroxide (brucite), graphite, copper carbonate, e.g. malachite, nickel carbonate, e.g. zarachite, barium carbonate, e.g. witherite and/or strontium carbonate e.g. strontianite
• Aluminium oxide silicates from the group consisting of olivine group; garnet group; aluminosilicates; ring silicates; chain silicates; and sheet silicates.
• the olivine group comprises silicate minerals, such as but not limited to, forsterite and Mg 2 Si04.
• the garnet group comprises ground silicate minerals, such as but not limited to, pyrope; Mg 3 Al2Si30i 2 ; grossular; and Ca 2 AI 2 Si30i 2 .
• Aluninosilicates comprise ground silicate minerals, such as but not limited to, sillimanite; AI 2 Si0 5 ; mullite; 3AI 2 0 3 .2Si0 2 ; kyanite; and AI 2 Si0 5
• the ring silicates group comprises silicate minerals, such as but not limited to, cordierite and AI 3 (Mg,Fe) 2 [Si4AIOi 8 ].
• the chain silicates group comprises ground silicate minerals, such as but not limited to, wollastonite and Ca[Si0 3 ].
• the sheet silicates group comprises silicate minerals, such as but not limited to, mica; K 2 Ali4[Si 6 AI 2 0 2 o](OH) 4 ; pyrophyllite; AI 4 [Si 8 0 2 o](OH)4; talc; Mg 6 [Si 8 0 2 o](OH)4;
• serpentine for example, asbestos; Kaolinite; AI 4 [Si40io](OH) 8 ; and vermiculite.
• the fillers may be surface treated for example with a fatty acid or a fatty acid ester such as a stearate, or with organosilanes, organosiloxanes, or organosilazanes hexaalkyl disilazane or short chain siloxane diols to render the filler(s) hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other sealant components
• a fatty acid or a fatty acid ester such as a stearate
• organosilanes, organosiloxanes, or organosilazanes hexaalkyl disilazane or short chain siloxane diols to render the filler(s) hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other sealant components
• the surface treatment of the fillers makes the ground silicate minerals easily wetted by the silicone polymer. These surface modified fillers do not clump, and can be homogeneously
• compositions include but are not restricted to co-catalysts for accelerating the cure of the composition such as metal salts of carboxylic acids and amines; rheological modifiers; plasticisers, adhesion promoters, pigments, Heat stabilizers, Flame retardants, UV stabilizers, Chain extenders, electrically and/or heat conductive fillers, Fungicides and/or biocides and the like (which may suitably by present in an amount of from 0 to 0.3% by weight), water scavengers, (typically the same compounds as those used as cross-linkers or silazanes). It will be appreciated that some of the additives are included in more than one list of additives. Such additives would then have the ability to function in all the different ways referred to.
• plasticisers are organopolysiloxanes which are unreactive with the siloxane polymer of the composition, such as polydimethylsiloxane having terminal triorganosiloxy groups wherein the organic substituents are, for example, methyl, vinyl or phenyl or combinations of these groups.
• polydimethylsiloxanes normally have a viscosity of from about 5 to about 100,000 mPa.s at 25°C.
• siloxanes such as (CH 3 )3Si-0-(Si(R) 2 -0) y - Si(CH 3 )3 (commercially available from Dow Corning as Dow Corning ® 200 fluid) with viscosity from 100 to 100000 mPa.s at 25°C.
• the rheological modifiers include silicone organic co-polymers such as those described in EP 0802233 based on polyols of polyethers or polyesters; non-ionic surfactants selected from the group consisting of polyethylene glycol, polypropylene glycol, ethoxylated castor oil, oleic acid ethoxylate, alkylphenol ethoxylates, copolymers or ethylene oxide (EO) and propylene oxide (PO), and silicone polyether copolymers; as well as silicone glycols.
• non-ionic surfactants selected from the group consisting of polyethylene glycol, polypropylene glycol, ethoxylated castor oil, oleic acid ethoxylate, alkylphenol ethoxylates, copolymers or ethylene oxide (EO) and propylene oxide (PO), and silicone polyether copolymers; as well as silicone glycols.
• adhesion promoter(s) may be incorporated in a sealant composition in accordance with the present invention.
• these may include for example alkoxy silanes such as aminoalkylalkoxy silanes, epoxyalkylalkoxy silanes, for example,
• Isocyanurates containing silicon groups such as 1 ,3,5-tris(trialkoxysilylalkyl) isocyanurates may additionally be used.
• adhesion promoters are reaction products of epoxyalkylalkoxy silanes such as 3-glycidoxypropyltrimethoxysilane with amino-substituted alkoxysilanes such as 3-aminopropyltrimethoxysilane and optionally alkylalkoxy silanes such as methyl-trimethoxysilane.
• Compatibilizers are typically small molecules and or oligomers with preferentially amphiphilic character which can be used to improve the incorporation of the water pick-up component (B) into the silicone polymer (A).
• These could be nonionic emulsifiers of general structure CxEy, where Cx stands for a saturated, linear or branched, aliphatic chain of x carbon atoms and Ey stands for an oligomeric block of Y oxyalkylene units illustrated by the average formula (-C n H 2n -0-)Y wherein n is an integer from 2 to 4 inclusive and Y is an integer between 4 and 30.
• X is between 8 and 30.
• Alternative compatibilizers include silicone polyethers. Both poly(ethylene oxide) and mixed poly(ethylene oxide)/poly(propylene oxide) polar blocks may be grafted to the silicone backbone. Both linear block (A-B (AB)n and, A-B-A type) and comb structures are available. Typically A is polyoxyalkylene of Z oxyalkylene units illustrated by the average formula (-C n H 2n -0-)z wherein n is an integer from 2 to 4 inclusive and Y is an integer between 4 and 50.
• a polyoxyalkylene for example, can be comprised of oxyethylene units (-C2H4-O-), oxypropylene units (-C 3 H 6 -0-) or oxybutylene units (-C 4 H 8 -0-); or mixtures thereof.
• the average molecular weight of each A-fragment may range from about 1000 to 30000.
• Typical Fragment B is (Si(R) 2 -0) x in which each R is free of aliphatic unsaturation and is selected from the group consisting of monovalent hydrocarbon, monovalent halohydrocarbon, and monovalent cyanoalkyl radicals of in each case 1 to 18 inclusive carbon atoms alternatively in each case 1 to 10 carbon atoms, further alternatively in each case 1 to 6 carbon atoms such as methyl, ethyl, propyl, or butyl.
• Heat stabilizers may include Iron oxides and carbon blacks, Iron carboxylate salts, cerium hydrate, titania, barium zirconate, cerium and zirconium octoates, and porphyrins.
• Flame retardants may include for example, carbon black, hydrated aluminium hydroxide, and silicates such as wollastonite, platinum and platinum compounds.
• Chain extenders may include difunctional silanes which extend the length of the polysiloxane polymer chains before crosslinking occurs and, thereby, reduce the modulus of elongation of the cured elastomer. Chain extenders and crosslinkers compete in their reactions with the functional polymer ends; in order to achieve noticeable chain extension, the difunctional silane must have substantially higher reactivity than the typical trifunctional cross-linker.
• Suitable chain extenders for condensation cure systems are, for example, Diacetamideosilanes such as dialkyldiacetamidosilanes or alkenylalkyldiacetamidosilanes, particularly methylvinyldi-di(N-methylacetamido)silane diacetoxysilanes, such as dialkyldiacetoxysilanes and alkylalkenyldiacetoxysilanes diaminosilanes, such as dialkyldiaminosilanes or alkylalkenyldiaminosilanes particularly those where each amino group has one Si-N bond and two N-C bonds; dialkoxysilanes such as dialkoxysiloxanes (having from 2 to 25 Si-0 linkages), diamidosilanes such as dialkyldiamidosilanes or alkylalkenyldiamidosilanes hexaorganodisilazanes (wherein the organo groups are each
• alkylalkenyldiketoximinosilanes a-aminoalkyldialkoxyalkylsilanes wherein the alkyl and alkoxy groups contain from 1 to 5 carbon atoms, such as
• a-aminomethyldialkoxymethylsilanes particularly preferred are those where the
• aminomethyl group is an ⁇ , ⁇ -dialkylaminomethyl group.
• Electrically conductive fillers may include carbon black, metal particles such as silver particles any suitable, electrically conductive metal oxide fillers such as titanium oxide powder whose surface has been treated with tin and/or antimony, potassium titanate powder whose surface has been treated with tin and/or antimony, tin oxide whose surface has been treated with antimony, and zinc oxide whose surface has been treated with aluminium.
• Thermally conductive fillers may include metal particles such as powders, flakes and colloidal silver, copper, nickel, platinum, gold aluminium and titanium, metal oxides, particularly aluminium oxide (Al 2 0 3 ) and beryllium oxide (BeO);magnesium oxide, zinc oxide, zirconium oxide; Ceramic fillers such as tungsten monocarbide, silicon carbide and aluminium nitride, boron nitride and diamond.
• metal particles such as powders, flakes and colloidal silver, copper, nickel, platinum, gold aluminium and titanium, metal oxides, particularly aluminium oxide (Al 2 0 3 ) and beryllium oxide (BeO);magnesium oxide, zinc oxide, zirconium oxide; Ceramic fillers such as tungsten monocarbide, silicon carbide and aluminium nitride, boron nitride and diamond.
• compositions as hereinbefore described have a reasonably quick room temperature cure time (Skin over time SOT) of between 10-70 minutes, alternatively about 20-30min. They cure upon exposure to (atmospheric) moisture.
• compositions may be designed to contain only ingredients with no or acceptably low toxicity, i.e. containing no ingredients causing known adverse effects such as skin irritation and/or sensitization or the like.
• cured elastomers made from the compositions hereinbefore described are able to up water when in contact with water, aqueous solutions or aqueous dispersions.
• Equally elastomers made from the compositions herein may be formulated to provide for desired strength / hardness and elongation and/or other physical properties and the compositions are storage stable in that they can be stored for a prolonged period of time, without losing more that 50% of their mechanical strength upon cure.
• compositions described herein uptake water in an amount of at least 0.01 gram of water per gram of cured sealant, when the cured sealant is immersed in water or phosphate buffer saline for 24h.
• Such compositions may therefore be useful as paintable sealants, (expandable) joint fillers and water adsorption sealants. These might find use in the applications where joint expansion is desired; for controlling and/or restraining the aqueous leaks which are not under pressure, as for example in rims of wound care and cosmetic patches, medical devices, diapers, etc.
• cured silicones made from the compositions as hereinbefore described are vapour permeable and inert to the skin and can be formulated to provide adhesion to skin, thus making them candidates as adhesives for cosmetic patches, drug- release patches (for both humans and animals) , wound dressings (for both humans and animals) and so on. It might be desirable that these compositions absorb the sweat or other body fluids.
• SOT Skin Over Time
• RH relative humidity
• Cure in Depth The CID test consists of making a 1 cm thick specimen in a cup, allowing the moisture to penetrate only from the air/sealant interface. Samples are allowed to cure for predefined periods of time e.g. 1 , 3 and/or 7 days, subsequent to which the thickness of the resulting cured layer is measured.
• Master batch type 1 was been prepared using 1 .75 parts of 1 ,6-bis(trimethoxy
• Masterbatch type 3 was prepared using 8 parts of cross-linker and 87 parts of the same trimethoxy silyl terminated siloxane polymer.
• the composition is deemed to be a suitable one-component sealant (1 K).
• the skin removed from the container is stored for another 24h to 48h on a lab bench to allow for complete cure (the side originally facing the bulk was exposed to the atmosphere).
• cured specimens were then used for evaluation of the water pick up ability of the formulations.
• the initial weight of each sample tested was between 2 and 6 grams, depending on the thickness.
• the following comparative example is a standard formulation comprising
• Example 1 a Composition
• Example component B in the formulation was of the type B) (i) a Hydrophilic and/or water soluble resin based on polyethylene oxide and/or polypropylene oxide.
• the resin used was a Polyox ® resin type WSR 205 which is commercially available from The Dow Chemical Company. Table 1 shows the composition of the sealants together with the type of cure and SOT.
• the material was immediately packed in standard sealant cartridges (ca. 330g per cartridge). 24h after the packaging some of the cartridges were stored in an oven at 40 C, the rest were kept in room temperature (22-23°C). 24h after packaging the sealant was successfully extruded using a manual cartridge gun. After one week of storage in an oven at 40°C the sealant was successfully extruded using a manual cartridge gun and no difference in appearance and extrudability was observed in comparison with the fresh sealant.
• Example 2 Compositions using component B (ii) anionic surfactants
• Bioterge ® AS90 (commercial material from Stepan) sodium alpha-olefine sulphonate Hostapur ® SAS 93G (commercial material from Clariant) Secondary alkane sulphonate, sodium salt.
• Nacconol ® 90G (commercial material from Stepan) Sodium (C10-16)
• Dispolil ® SLS 128 (commercial materials from Cognis) Sodium lauryl sulphates (C12-C18)
• Table 4 shows the formulation, the type of cure and SOT.
• Table 5 shows the water pick up of selected formulations; stability data is shown in Table 6.
• Example 3 Composition containing component B (iii) a commercial polymer with pendant sulphonic groups and PVA
• Material used was Polyvinyl Alcohol (commercial name Mowiol ® 5-88) commercially available form KURARAY.
• Table 7 show the composition of the sealants made with PVA. Table 7a
• Table 7b water pick up material was sodium polystyrene sulphonate with MW of 75000 D, commercially available form Alfa Aesar

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