CA2234668C - One-component chemically curing hot applied insulating glass sealant - Google Patents
One-component chemically curing hot applied insulating glass sealant Download PDFInfo
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- CA2234668C CA2234668C CA002234668A CA2234668A CA2234668C CA 2234668 C CA2234668 C CA 2234668C CA 002234668 A CA002234668 A CA 002234668A CA 2234668 A CA2234668 A CA 2234668A CA 2234668 C CA2234668 C CA 2234668C
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Abstract
This invention relates generally to sealants for insulating glass units. More specifically this invention is a one-component, hot applied, chemically curing sealant for edge sealing insulating glass units.
The sealant contains a thermoplastic hot melt resin blended with an atmospheric curing resin. The hot melt resin functions as the meltable component during the initial application, and supplies strength immediately upon cooling. The polymer phase then begins to cure by reaction with atmospheric oxygen and/or moisture to form a cross-linked thermoset elastomer which is temperature resistant. At this point, the hot melt resin functions as an inert plasticizer within the cured polymer phase. The sealant of the present invention may additionally include plasticizers, fillers, pigments, catalysts and the like.
The sealant contains a thermoplastic hot melt resin blended with an atmospheric curing resin. The hot melt resin functions as the meltable component during the initial application, and supplies strength immediately upon cooling. The polymer phase then begins to cure by reaction with atmospheric oxygen and/or moisture to form a cross-linked thermoset elastomer which is temperature resistant. At this point, the hot melt resin functions as an inert plasticizer within the cured polymer phase. The sealant of the present invention may additionally include plasticizers, fillers, pigments, catalysts and the like.
Description
ONE-COMPONENT CHEMICALLY URING HOT APPLIED
INSULATING GLASS SEALANT
Background of the Invention Field of the Invention This invention relates generally to methods and compositions relating to the construction of insulating glass units and in particular, methods and compositions for making a sealant which is applied at the edges of insulating glass units for the purpose ofadhering the components ofthe unit together, and sealing the unit from subsequent moisture penetration. Most specifically, the present invention relates to a one-component edge sealant for insulating glass units which is applied as a liquid or paste at an elevated temperature, then reversibly and rapidly solidifies upon cooling, and thereafter irreversibly solidifies upon exposure to ambient atmospheric conditions.
Description of the Prior Art Insulating glass units generally comprise a pair of glass sheets maintained in a spaced apart relationship to each other by a spacing and sealing assembly which extends around the periphery of the inner, facing surfaces of the glass sheets, to define a sealed and insulating air space between the glass sheets. A spacer assembly generally comprises an inner spacer-dehydrator element which extends around the periphery of the inside facing surfaces of the glass sheets. The inner surfaces of the glass sheets are attached to the outer surface of the spacer assembly by means of a sealant or adhesive. Generally, the sealant or adhesive is also used to seal the edges of the glass unit so as to establish a barrier which prevents moisture from penetrating into the interior of the unit.
The two major types of sealants currently used in the insulating glass industry are the thermoplastic one-part hot melt butyl type, and the chemically curing, thermoset products generally from the generic families of polysulfide, polyurethane, and silicone. The former, or the hot melt butyl insulating glass sealants, have been used with moderate success for a number of years in the insulating glass industry. However, there are significant shortcomings with this technology that has limited the application of hot melt butyl insulating glass sealants. Primarily, the hot melt butyl is thermoplastic, and not thermoset.
That is, these sealants are subject to softening when exposed to heat. Therefore, the insulating glass units sold in the marketplace, when placed under load, will flow or deform to relieve the load. This characteristic is exaggerated at high temperatures, which can occur in insulating glass units, especially those utilizing solar control glass. As a result, insulating glass units made with hot melt butyl sealants have di$iculty passing the industry standard test due to stress and temperature, and can only be used successfully in relatively small, light units. Additionally, extreme care must be taken to support the insulating glass unit during handling, shipping and installation, resulting in additional costs.
Furthermore, the hot melt sealants previously employed must be applied to the units at temperatures exceeding 300°F. These high temperature requirements have resulted in worker injury, due to burns, as well as increased manufacturing costs due to higher energy consumption and the need for specialized, high-temperature equipment. Any attempts to utilize lower temperature hot melts have resulted in greater flow problems with the sealant, as has previously been discussed.
The thermoset products which are currently used are generally two-component sealants which are mixed at the point of application at room temperature. The sealants then cure slowly by reaction with the supplied catalyst or through reaction with moisture. This slow cure requires that the insulating glass units be held in inventory from several hours to days waiting for the sealant to harden. Additionally, these two-component systems are more difFlcult to employ and further increase manufacturing costs because of the additional steps involved in their use. s U.S. Patent No. 4,032,500 discloses a two-component, curable sealant composition, each component being individually storage-stable. Each component contains oil-extended low molecular weight uncured butyl rubber. The components are mixed together just prior to use in an approximately one to one volume ratio.
U.S. Patent No. 4,042, ;r36 discloses a single application sealant for use in insulating glass units comprising a partially cross-linked hot melt butyl rubber sealant.
The patent further discloses th=at complete cross-linking of the sealant will occur when the composition is. post heated from about 325°f to about 425°F.
Sufficient heat is applied to the exterior face of they Sealant composition to raise the temperature of the outerniost portion of the seala~ut composition to this temperature range, while the innermost portion of the sealant composition remains at a temperature substantially below this temperature range.
U.S. Patent No. 4,808,~r55 discloses an extrudable reactive hot melt urethane adhesive containing a urethane prepolymer, a tackifying resin and a thermoplastic resin. However, since the curing; the urethane liberates COZ gas, adhesives utilizing a urethane-curing chemistry are highly unsuitable for the insulating glass industry, as bubbles can get trapped at the interlace of the sealant and the glass.
US Patent No. 5,340,8'v 7 ( Vincent) discloses an adhesive composition comprising a thermoplastic hydrokyl-functional organopolysiloxane resin, a diorganopolysiloxane ~:~olymer having silicon-bonded hydroxyl terminal groups, a ketoximosilane and ;:gin optional catalyst.
US Patent No. 5,061,7-19 discloses a one-pack type heat pre-curable moisture-curing sealant composition comprising a urethane prepolymer containing a specific amount of an active free isocy~nate group and a vinyl polymer containing a hydrolysable siloa;y group. Tl~e siloxy group of the vinyl polymer is hydrolyzed with moisture in the air to produce ~i hydroxy group. The hydroxy group is then reacted with the active free isocyanotc group of the urethane prepalymer. The reaction is promoted by heating to a temperature of 40°C to 120°(' ( 129-273°F).
The present invention ;~ec;ks to overcome the problems of the prior art in that it provides an edge ;sealant for u:;e in insulating glass units by providing a silicon-functionalized, chemically curing thennoset product with inherently high strength and resistance to flow, while providing the convenience of a one-part sealant with hot melt-type application properties. Because the present sealant employs compatible compositions which solidify at different rates and through different mechanisms, the present invention can be applifd at a lower temperature than traditional hot melts, and also provides sufficient handling strength to the unit faster than traditional chemical-cure products, thereby combining the best praperties of bath the hot melt and chemically curing teclvlologie~~ into a successful sealant for the insulating glass industry. The sealant of the present invention is designed to be applied at elevated temperatures in the range of 1 ~'.5~-250°F, in the forrr~ of a liquid or paste which turns back to a solid im~:nediately upon cooling. 'hhe product then cures to a permanent solid elastomer by reaction with atmospheric oxygen and/or moisture. These and other advantages of the present invention will be readily apparent from the description, the discussion and e:Kamples which follow.
There is disclosed herein an edge sealant for insulating glass units comprising a thermoplastic hot melt resin ,:end an atmospheric cL~ring resin of the type which polymerizes upon exposure to an ambient atmosphere, the atmospheric curing resin being combined with the thermoplastic hot melt resin as a single material. The thermoplastic hot melt resin ar5d the atmospheric curing resin can comprise identical compositions. The present sealant comprises, by weight, approximately 10-90%
by weight of a therm~~plastic hot rnc;lt resin, together with 5-50% by weight of an atmospheric curing resin.
According to one aspect of the present invention there is provided an insulating glass unit having a first glazing pane maintained in a spaced apart relation with a second glazing pane by a spacer, an edge sealant for said insulating glass unit, said sealant comprising:
a thermoplastic hot-melt resin, said thermoplastic hot melt resin having a melt temperature of around ~ 25-250°F', and an atmospheric curing resin, said atmospheric curing resin polymerizing upon exposure tc~ a component of the atmosphere, said component comprising a compound selected 1-rom the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin comprising a silicon-containing atmospheric curing rf;sin, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above around 6$-77°F, reversibly solidifies upon 4a cooling to a temperature of arou~ d 68-77°F, and irreversibly solidifies upon subsequent exposure to said ct>mponent of the atmosphere.
According; to a further aspect of the present invention there is provided a one-part edge sealant, said sealant comprising:
a thermoplastic hut melt resin, said hot melt resin having a melt temperature of around 125-25ii°T, and a silicon-containing atmospheric curing resin, said atmospheric curing resin polymerizing upon exposure to a component of the atmosphere, said component comprising a compound selected from the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above around ~8-77°f, reversibly solidifies upon cooling to a temperature of around 68-77°F, and irreversibly solidifies upon subsequent exposure to said component: of the atmosphere.
According to another aspect of the present invention there is provided a one-part edge sealant, said sealant s;omprising:
10-90% by weight of said sealant of a thermoplastic hot melt resin, said hot melt resin comprising a compound selected from the group consisting of solid chlorinated paraffin, epoxidized Soya oil, polyisobutylene, and mixtures thereof, and 5-50% by weight of said sealant of an atmospheric curing resin which polymerizes upon exposure to a component of the atmosphere, said component comprising a compound selected U:rom the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin comprising a compound selected from the group consisting of an alkoxy silane terminated polyurethane, an organo functional silane, and mixtures thereof, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above around 68-77°p, reversibly solidifies upon cooling to a temperature of around 68-77°F, and irreversibly solidifies upon subsequent exposure to said component of the atmosphere.
In some preferred embc~di.ments:
4b said thermoplastic hot mc;lt resin comprises approximately 10-90% by weight of said sealant;
said atmospheric curinresin component comprises approximately 5-50% by weight of said sealant;
said thernioplastic hot ~ne;lt resin comprises a compound selected from the group consisting of polyethyleoes, polyolefins, polyvinyl acetate, polyamides, hydrocarbon resins, asphalts, hit~.~mens, waxes, paraffins, crude rubbers, fluorinated rubbers, polyvinyl chloride, polyamides, fluorocarbons, polystyrene, polypropylenes, cellulosic resi~as, acrylic resins, thermoplastic elastomers, styrene butadiene resins, polyterpenes, ethylene propylene dime monomer, and mixtures thereo f;
said thermoplastic hot melt resin comprises a compound selected from the group consisting of solid chlorinated paraffin, polyisobutylene, epoxidized soya oil, and mixtures thereof;
said atmospheric curing resin comprises a compound selected from the group consisting of moisture curing turethanes, moisture curing polysulfides, oxygen curing polysulfides, and mixtures therec>i';
said atmospheric curin,y resin comprises a compound selected from the group consisting of alkoxy silane terminated polyurethanes, alkoxy silane terminated polyethers, polydimethylsilox~~ne; resins, organo functional silanes, and mixtures thereo f;
said thermoplastic hot melt resin also functions as said atmospheric curing resrn;
said thermoplastic hot melt resin and said atmospheric curing resin comprise a compound selected from the group consisting of high molecular weight silicon-containing urethane prepolymf~rs and silicon-containing acrylonitrile butadiene copolymers;
and the sealant further comprises a compound selected from the group consisting of plasticizers, fillers, pigments, catalysts, weatherability improvers, and mixtures thereof.
~C
In particular embodiments, the thermoplastic hot melt resin comprises a solid chlorinated paraffin. 'fhe atmospheric curing resin is preferably a silane terminated polyurethane. The sealant mdy also include ancillary ingredients such as plasticizers, catalysts, and fillers. Small v~olurne additives may include colorants, rheological materials, weatherability improvers, and/or pigments, as are known in the art.
The present invention is directed to a one-component, hot applied, chemically curing edge sealant for insulating glass units. The purpose of the sealant is to provide structural integrity to the unit while sealing out moisture and preventing the exchange of gasses. The edge sealant also resists environmental attack from water, UV, and temperature extremes.l'he sealant of the present invention is designed to be applied at an elevated temperature of ap~~roximately 125-250°F in the forn~ of a liquid or a paste, which then turns back to a solid immediately upon cooling. The product then begins curing to a permanent solid elastomer by reaction which atmospheric moisture and/or oxygen. The present invention combines the application properties of a hot melt product with its attendant rapid cooling to a solid, which allows the immediate handling of the insulating glass unit. The sealant of the present invention then cures chemically to provide a permanent elastomeric, temperature-resistant sealant 5 which provides the structural integrity for the insulating glass unit.
The sealant of the present invention comprises a thermoplastic hot melt resin, and an atmospheric curing resin of the type which polymerizes upon exposure to an ambient atmosphere, the atmospheric curing resin being combined with the thermoplastic hot melt resin as a single material. This is understood to mean that on a macroscopic scale, the sealant comprises a substantially homogeneous mixture; it may also include compositional variations on a microscopic scale. In an alternate embodiment, the thermoplastic hot melt resin and the atmospheric curing resin may comprise an identical composition. The hot melt resin functions as the meltable component during the initial application and supplies strength immediately upon cooling. The polymer phase then begins to cure by reaction with atmospheric moisture to form a cross-linked thermoset elastomer which is temperature resistant. At this point, the hot melt resin functions as an inert plasticizes within the cured polymer phase.
Strength properties in the hot melt phase can be controlled by the type and quantity of the hot melt resin and filler selection. Ultimate strength of the edge sealant is controlled by the type and cross-linked density of the curing polymer.
Within the context of this disclosure, atmospheric "curing resins" are meant to include polymeric materials which cross-link and/or polymerize upon exposure to a component of the ambient atmosphere, typically oxygen or water vapor.
Preferably, the thermoplastic hot melt resin is present in the sealant in a concentration of 10-90% by weight, more preferably 30-80% by weight and most preferably 40-65% by weight. The atmospheric curing resin is typically present in the sealant in a range of 5-50% by weight more preferably 10-40% by weight, and most preferably 18-28% by weight. The sealant may also include a catalyst, plasticizers, fillers, pigments, weatherability improvers and the like, as are known in the art.
The thermoplastic hot melt resin is preferably one which solidifies ' immediately upon cooling. It may fi.~rther comprise polyethylenes, polyolefins, polyvinyl acetate polyamides, hydrocarbon resins, asphalts, bitumens, waxes, paraffins, crude rubbers, fluorinated rubbers, polyvinyl chloride, polyamides, fluorocarbons, polystyrene, polypropylenes, cellulosic resins, acrylic resins, thermoplastic elastomers, styrene butadiene resins, ethylene propylene dime monomer, polyterpenes, and mixtures thereof. One particularly preferred thermoplastic hot melt resin is a mixture of solid chlorinated parafl'ln and an epoxidized soya oil. Another preferred thermoplastic hot melt resin is a mixture of solid chlorinated para~n and polyisobutylene.
The atmospheric curing resin begins to cure subsequently to the cooling of the hot melt resin by reaction with oxygen and/or atmospheric moisture to form a cross-linked thermoset elastomer which is temperature resistant. A preferable group of atmospheric curing resins comprise moisture cure polyurethanes, moisture cure polysulfides, polydimethylsiloxanes, oxygen cure polysulfides, and mixtures thereof, some containing silicon functionalities. Some specific atmospheric curing resins include alkoxy, acetoxy, oxyamino silane terminated polyethers and polyether urethanes; alkyl siloxane polymers crosslinked with alkoxy, acetoxy, oxyamino organo functional silanes; moisture curable isocyanate fiznctional polyoxyalkaline polymers and polyalkaline polymers; thiol functional polymers and oligomers (such as polyethers, polyether urethanes, polysulfides, polythioethers), suitably catalyzed to produce moisture curable systems; epoxide functional polymers and oligomers with moisture deblockable crosslinkers; acrylic fiznctional polymers with deblockable crosslinkers, and mixtures thereof. Most preferably, the atmospheric curing resin comprises atkoxy silane terminated polyurethanes, alkoxy silane terminated polyethers, polydimethylsiloxane polymers, and mixtures thereof.
In a most preferred formulation, the atmospheric curing resin comprises a mixture of Permapol MS (alkox:y silane terminated polyurethane, manufactured by Courtaulds Coatings, Inc.) and an organo functional silane.
As has already been disclosed, in an alternate embodiment, the thermoplastic hot melt :resin and the atmospheric curing resin can comprise an identical composition. One preferred formulation comprises high molecular weight silicon-terminated urethacie prepolymers. Another formulation comprises silicon-firnctionalized Kraton lsolymers (block copolymers, manufactured by Shell).
Kraton polymers are block copolymers of several types such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), and SEBS (styrene-ethylene/butylene-styrene). Yet another formulation comprises Kraton polymers with other functional groups whiEh provide for rapid solidification upon cooling:
followed by chemical cure upon exposure to atmospheric conditions.
The specific orga~~ic catalyst used in the present invention will depend upon the particular atmospheric:: caring resin which is used. Preferable catalysts comprise IS organo tin compounds, aliphatic titanates (having from 1-12 carbon atoms) such as lower alkyl titanates., and amines. Most preferably the catalyst comprises dibutyltin dilaurate, dibutylt:in diacetate, tetrabutyl titanate, and tetraethyl titanate.
Although the sealant will still cure without the addition of the catalyst, the addition of a catalyst may provide for faster curing times, which may be necessary in certain situations. It may also be desirable, in some instances, to add additional fillers, pigments, rheological agents and like.
Strength properties in the hot melt phase depends on the type and quantity of the hot melt resin, and also the filler selection. One preferred filler is talc. Other fillers can be used, as is known in the art 'Che range of fillers may be selected by one of skill i:n the art and added in an amount sufficient to impart the appropriate strength to the hot melt please, as well as to impart desirable application properties to the sealant. The sealant of the present invention should be easy to handle and apply to the insulating glass units The sealant of the present invention may be prepared in the following ~ 0 manner. Preferably, the thermoplastic hot melt resin, or mixtures thereof, is first * T~ad~rrrmsrk disposed in a mixing vessel at an elevated temperature. In one preferred embodiment, the mixing vessel is capable of carrying out mixing under a vacuum v and which further includes a mixer that comprises a variable speed, mufti-shaft unit, having a low speed sweep blade, a high speed disperser, and a low speed auger.
S The filler is then added to the hot melt resin and mixing begins at low speed.
Thereafter, the atmospheric curing resin, or mixtures thereof, to which additional filler has been added to form an atmospheric curing resin composition, is added to the mixture subsequent to turning on the vacuum. At the point the atmospheric curing resin composition is added, the mixing is conducted under vacuum so as to eliminate any exposure of the mixture to atmospheric conditions, and also to remove residual water from the raw materials, thereby improving package stability.
Small volume additives such as pigments, weatherability improvers and the like can be added before the introduction of the atmospheric curing resin composition, while any catalyst may be added after. The material is maintained under essentially dry conditions until such time as it is ready to be applied to the insulating glass unit. In other preferred embodiments, the mixing may be carried out under a blanket of dry, inert gas.
The edge sealant of the present invention is applied to the insulating glass unit at elevated temperatures, approximately 125-250°F in the form of a liquid or a paste. Thereafter the sealant rapidly but reversibly cools into a solid. The sealant then begins to cure to a permanent solid elastomer by reaction with atmospheric oxygen and/or moisture. The sealant of the present invention is applied to the unit as a single material, therefore eliminating the need to combine several components together at the point of application.
The present invention will best be illustrated by the following series of examples:
,F.~C~~MP I~E 1 CHARGE
M8TEB181. ,~T ~ WEIGHT PRO D 1R .
Note: Preheat the pot to 180 F. Maintain that temperature throughout the process.
1. Chlorinated 120.0 Ibs 6.0%a Charge. Mix at Plasticizer low speed.
2. Epoxidized 100.0 lbs S.0% Charge.
Soya Oil 3. Solid Chlorinated760.0 Ibs 38.0% Charge. Turn Paraffin ondisperser at medium speed.
Continue mixing until the material becomes fluid.
INSULATING GLASS SEALANT
Background of the Invention Field of the Invention This invention relates generally to methods and compositions relating to the construction of insulating glass units and in particular, methods and compositions for making a sealant which is applied at the edges of insulating glass units for the purpose ofadhering the components ofthe unit together, and sealing the unit from subsequent moisture penetration. Most specifically, the present invention relates to a one-component edge sealant for insulating glass units which is applied as a liquid or paste at an elevated temperature, then reversibly and rapidly solidifies upon cooling, and thereafter irreversibly solidifies upon exposure to ambient atmospheric conditions.
Description of the Prior Art Insulating glass units generally comprise a pair of glass sheets maintained in a spaced apart relationship to each other by a spacing and sealing assembly which extends around the periphery of the inner, facing surfaces of the glass sheets, to define a sealed and insulating air space between the glass sheets. A spacer assembly generally comprises an inner spacer-dehydrator element which extends around the periphery of the inside facing surfaces of the glass sheets. The inner surfaces of the glass sheets are attached to the outer surface of the spacer assembly by means of a sealant or adhesive. Generally, the sealant or adhesive is also used to seal the edges of the glass unit so as to establish a barrier which prevents moisture from penetrating into the interior of the unit.
The two major types of sealants currently used in the insulating glass industry are the thermoplastic one-part hot melt butyl type, and the chemically curing, thermoset products generally from the generic families of polysulfide, polyurethane, and silicone. The former, or the hot melt butyl insulating glass sealants, have been used with moderate success for a number of years in the insulating glass industry. However, there are significant shortcomings with this technology that has limited the application of hot melt butyl insulating glass sealants. Primarily, the hot melt butyl is thermoplastic, and not thermoset.
That is, these sealants are subject to softening when exposed to heat. Therefore, the insulating glass units sold in the marketplace, when placed under load, will flow or deform to relieve the load. This characteristic is exaggerated at high temperatures, which can occur in insulating glass units, especially those utilizing solar control glass. As a result, insulating glass units made with hot melt butyl sealants have di$iculty passing the industry standard test due to stress and temperature, and can only be used successfully in relatively small, light units. Additionally, extreme care must be taken to support the insulating glass unit during handling, shipping and installation, resulting in additional costs.
Furthermore, the hot melt sealants previously employed must be applied to the units at temperatures exceeding 300°F. These high temperature requirements have resulted in worker injury, due to burns, as well as increased manufacturing costs due to higher energy consumption and the need for specialized, high-temperature equipment. Any attempts to utilize lower temperature hot melts have resulted in greater flow problems with the sealant, as has previously been discussed.
The thermoset products which are currently used are generally two-component sealants which are mixed at the point of application at room temperature. The sealants then cure slowly by reaction with the supplied catalyst or through reaction with moisture. This slow cure requires that the insulating glass units be held in inventory from several hours to days waiting for the sealant to harden. Additionally, these two-component systems are more difFlcult to employ and further increase manufacturing costs because of the additional steps involved in their use. s U.S. Patent No. 4,032,500 discloses a two-component, curable sealant composition, each component being individually storage-stable. Each component contains oil-extended low molecular weight uncured butyl rubber. The components are mixed together just prior to use in an approximately one to one volume ratio.
U.S. Patent No. 4,042, ;r36 discloses a single application sealant for use in insulating glass units comprising a partially cross-linked hot melt butyl rubber sealant.
The patent further discloses th=at complete cross-linking of the sealant will occur when the composition is. post heated from about 325°f to about 425°F.
Sufficient heat is applied to the exterior face of they Sealant composition to raise the temperature of the outerniost portion of the seala~ut composition to this temperature range, while the innermost portion of the sealant composition remains at a temperature substantially below this temperature range.
U.S. Patent No. 4,808,~r55 discloses an extrudable reactive hot melt urethane adhesive containing a urethane prepolymer, a tackifying resin and a thermoplastic resin. However, since the curing; the urethane liberates COZ gas, adhesives utilizing a urethane-curing chemistry are highly unsuitable for the insulating glass industry, as bubbles can get trapped at the interlace of the sealant and the glass.
US Patent No. 5,340,8'v 7 ( Vincent) discloses an adhesive composition comprising a thermoplastic hydrokyl-functional organopolysiloxane resin, a diorganopolysiloxane ~:~olymer having silicon-bonded hydroxyl terminal groups, a ketoximosilane and ;:gin optional catalyst.
US Patent No. 5,061,7-19 discloses a one-pack type heat pre-curable moisture-curing sealant composition comprising a urethane prepolymer containing a specific amount of an active free isocy~nate group and a vinyl polymer containing a hydrolysable siloa;y group. Tl~e siloxy group of the vinyl polymer is hydrolyzed with moisture in the air to produce ~i hydroxy group. The hydroxy group is then reacted with the active free isocyanotc group of the urethane prepalymer. The reaction is promoted by heating to a temperature of 40°C to 120°(' ( 129-273°F).
The present invention ;~ec;ks to overcome the problems of the prior art in that it provides an edge ;sealant for u:;e in insulating glass units by providing a silicon-functionalized, chemically curing thennoset product with inherently high strength and resistance to flow, while providing the convenience of a one-part sealant with hot melt-type application properties. Because the present sealant employs compatible compositions which solidify at different rates and through different mechanisms, the present invention can be applifd at a lower temperature than traditional hot melts, and also provides sufficient handling strength to the unit faster than traditional chemical-cure products, thereby combining the best praperties of bath the hot melt and chemically curing teclvlologie~~ into a successful sealant for the insulating glass industry. The sealant of the present invention is designed to be applied at elevated temperatures in the range of 1 ~'.5~-250°F, in the forrr~ of a liquid or paste which turns back to a solid im~:nediately upon cooling. 'hhe product then cures to a permanent solid elastomer by reaction with atmospheric oxygen and/or moisture. These and other advantages of the present invention will be readily apparent from the description, the discussion and e:Kamples which follow.
There is disclosed herein an edge sealant for insulating glass units comprising a thermoplastic hot melt resin ,:end an atmospheric cL~ring resin of the type which polymerizes upon exposure to an ambient atmosphere, the atmospheric curing resin being combined with the thermoplastic hot melt resin as a single material. The thermoplastic hot melt resin ar5d the atmospheric curing resin can comprise identical compositions. The present sealant comprises, by weight, approximately 10-90%
by weight of a therm~~plastic hot rnc;lt resin, together with 5-50% by weight of an atmospheric curing resin.
According to one aspect of the present invention there is provided an insulating glass unit having a first glazing pane maintained in a spaced apart relation with a second glazing pane by a spacer, an edge sealant for said insulating glass unit, said sealant comprising:
a thermoplastic hot-melt resin, said thermoplastic hot melt resin having a melt temperature of around ~ 25-250°F', and an atmospheric curing resin, said atmospheric curing resin polymerizing upon exposure tc~ a component of the atmosphere, said component comprising a compound selected 1-rom the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin comprising a silicon-containing atmospheric curing rf;sin, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above around 6$-77°F, reversibly solidifies upon 4a cooling to a temperature of arou~ d 68-77°F, and irreversibly solidifies upon subsequent exposure to said ct>mponent of the atmosphere.
According; to a further aspect of the present invention there is provided a one-part edge sealant, said sealant comprising:
a thermoplastic hut melt resin, said hot melt resin having a melt temperature of around 125-25ii°T, and a silicon-containing atmospheric curing resin, said atmospheric curing resin polymerizing upon exposure to a component of the atmosphere, said component comprising a compound selected from the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above around ~8-77°f, reversibly solidifies upon cooling to a temperature of around 68-77°F, and irreversibly solidifies upon subsequent exposure to said component: of the atmosphere.
According to another aspect of the present invention there is provided a one-part edge sealant, said sealant s;omprising:
10-90% by weight of said sealant of a thermoplastic hot melt resin, said hot melt resin comprising a compound selected from the group consisting of solid chlorinated paraffin, epoxidized Soya oil, polyisobutylene, and mixtures thereof, and 5-50% by weight of said sealant of an atmospheric curing resin which polymerizes upon exposure to a component of the atmosphere, said component comprising a compound selected U:rom the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin comprising a compound selected from the group consisting of an alkoxy silane terminated polyurethane, an organo functional silane, and mixtures thereof, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above around 68-77°p, reversibly solidifies upon cooling to a temperature of around 68-77°F, and irreversibly solidifies upon subsequent exposure to said component of the atmosphere.
In some preferred embc~di.ments:
4b said thermoplastic hot mc;lt resin comprises approximately 10-90% by weight of said sealant;
said atmospheric curinresin component comprises approximately 5-50% by weight of said sealant;
said thernioplastic hot ~ne;lt resin comprises a compound selected from the group consisting of polyethyleoes, polyolefins, polyvinyl acetate, polyamides, hydrocarbon resins, asphalts, hit~.~mens, waxes, paraffins, crude rubbers, fluorinated rubbers, polyvinyl chloride, polyamides, fluorocarbons, polystyrene, polypropylenes, cellulosic resi~as, acrylic resins, thermoplastic elastomers, styrene butadiene resins, polyterpenes, ethylene propylene dime monomer, and mixtures thereo f;
said thermoplastic hot melt resin comprises a compound selected from the group consisting of solid chlorinated paraffin, polyisobutylene, epoxidized soya oil, and mixtures thereof;
said atmospheric curing resin comprises a compound selected from the group consisting of moisture curing turethanes, moisture curing polysulfides, oxygen curing polysulfides, and mixtures therec>i';
said atmospheric curin,y resin comprises a compound selected from the group consisting of alkoxy silane terminated polyurethanes, alkoxy silane terminated polyethers, polydimethylsilox~~ne; resins, organo functional silanes, and mixtures thereo f;
said thermoplastic hot melt resin also functions as said atmospheric curing resrn;
said thermoplastic hot melt resin and said atmospheric curing resin comprise a compound selected from the group consisting of high molecular weight silicon-containing urethane prepolymf~rs and silicon-containing acrylonitrile butadiene copolymers;
and the sealant further comprises a compound selected from the group consisting of plasticizers, fillers, pigments, catalysts, weatherability improvers, and mixtures thereof.
~C
In particular embodiments, the thermoplastic hot melt resin comprises a solid chlorinated paraffin. 'fhe atmospheric curing resin is preferably a silane terminated polyurethane. The sealant mdy also include ancillary ingredients such as plasticizers, catalysts, and fillers. Small v~olurne additives may include colorants, rheological materials, weatherability improvers, and/or pigments, as are known in the art.
The present invention is directed to a one-component, hot applied, chemically curing edge sealant for insulating glass units. The purpose of the sealant is to provide structural integrity to the unit while sealing out moisture and preventing the exchange of gasses. The edge sealant also resists environmental attack from water, UV, and temperature extremes.l'he sealant of the present invention is designed to be applied at an elevated temperature of ap~~roximately 125-250°F in the forn~ of a liquid or a paste, which then turns back to a solid immediately upon cooling. The product then begins curing to a permanent solid elastomer by reaction which atmospheric moisture and/or oxygen. The present invention combines the application properties of a hot melt product with its attendant rapid cooling to a solid, which allows the immediate handling of the insulating glass unit. The sealant of the present invention then cures chemically to provide a permanent elastomeric, temperature-resistant sealant 5 which provides the structural integrity for the insulating glass unit.
The sealant of the present invention comprises a thermoplastic hot melt resin, and an atmospheric curing resin of the type which polymerizes upon exposure to an ambient atmosphere, the atmospheric curing resin being combined with the thermoplastic hot melt resin as a single material. This is understood to mean that on a macroscopic scale, the sealant comprises a substantially homogeneous mixture; it may also include compositional variations on a microscopic scale. In an alternate embodiment, the thermoplastic hot melt resin and the atmospheric curing resin may comprise an identical composition. The hot melt resin functions as the meltable component during the initial application and supplies strength immediately upon cooling. The polymer phase then begins to cure by reaction with atmospheric moisture to form a cross-linked thermoset elastomer which is temperature resistant. At this point, the hot melt resin functions as an inert plasticizes within the cured polymer phase.
Strength properties in the hot melt phase can be controlled by the type and quantity of the hot melt resin and filler selection. Ultimate strength of the edge sealant is controlled by the type and cross-linked density of the curing polymer.
Within the context of this disclosure, atmospheric "curing resins" are meant to include polymeric materials which cross-link and/or polymerize upon exposure to a component of the ambient atmosphere, typically oxygen or water vapor.
Preferably, the thermoplastic hot melt resin is present in the sealant in a concentration of 10-90% by weight, more preferably 30-80% by weight and most preferably 40-65% by weight. The atmospheric curing resin is typically present in the sealant in a range of 5-50% by weight more preferably 10-40% by weight, and most preferably 18-28% by weight. The sealant may also include a catalyst, plasticizers, fillers, pigments, weatherability improvers and the like, as are known in the art.
The thermoplastic hot melt resin is preferably one which solidifies ' immediately upon cooling. It may fi.~rther comprise polyethylenes, polyolefins, polyvinyl acetate polyamides, hydrocarbon resins, asphalts, bitumens, waxes, paraffins, crude rubbers, fluorinated rubbers, polyvinyl chloride, polyamides, fluorocarbons, polystyrene, polypropylenes, cellulosic resins, acrylic resins, thermoplastic elastomers, styrene butadiene resins, ethylene propylene dime monomer, polyterpenes, and mixtures thereof. One particularly preferred thermoplastic hot melt resin is a mixture of solid chlorinated parafl'ln and an epoxidized soya oil. Another preferred thermoplastic hot melt resin is a mixture of solid chlorinated para~n and polyisobutylene.
The atmospheric curing resin begins to cure subsequently to the cooling of the hot melt resin by reaction with oxygen and/or atmospheric moisture to form a cross-linked thermoset elastomer which is temperature resistant. A preferable group of atmospheric curing resins comprise moisture cure polyurethanes, moisture cure polysulfides, polydimethylsiloxanes, oxygen cure polysulfides, and mixtures thereof, some containing silicon functionalities. Some specific atmospheric curing resins include alkoxy, acetoxy, oxyamino silane terminated polyethers and polyether urethanes; alkyl siloxane polymers crosslinked with alkoxy, acetoxy, oxyamino organo functional silanes; moisture curable isocyanate fiznctional polyoxyalkaline polymers and polyalkaline polymers; thiol functional polymers and oligomers (such as polyethers, polyether urethanes, polysulfides, polythioethers), suitably catalyzed to produce moisture curable systems; epoxide functional polymers and oligomers with moisture deblockable crosslinkers; acrylic fiznctional polymers with deblockable crosslinkers, and mixtures thereof. Most preferably, the atmospheric curing resin comprises atkoxy silane terminated polyurethanes, alkoxy silane terminated polyethers, polydimethylsiloxane polymers, and mixtures thereof.
In a most preferred formulation, the atmospheric curing resin comprises a mixture of Permapol MS (alkox:y silane terminated polyurethane, manufactured by Courtaulds Coatings, Inc.) and an organo functional silane.
As has already been disclosed, in an alternate embodiment, the thermoplastic hot melt :resin and the atmospheric curing resin can comprise an identical composition. One preferred formulation comprises high molecular weight silicon-terminated urethacie prepolymers. Another formulation comprises silicon-firnctionalized Kraton lsolymers (block copolymers, manufactured by Shell).
Kraton polymers are block copolymers of several types such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), and SEBS (styrene-ethylene/butylene-styrene). Yet another formulation comprises Kraton polymers with other functional groups whiEh provide for rapid solidification upon cooling:
followed by chemical cure upon exposure to atmospheric conditions.
The specific orga~~ic catalyst used in the present invention will depend upon the particular atmospheric:: caring resin which is used. Preferable catalysts comprise IS organo tin compounds, aliphatic titanates (having from 1-12 carbon atoms) such as lower alkyl titanates., and amines. Most preferably the catalyst comprises dibutyltin dilaurate, dibutylt:in diacetate, tetrabutyl titanate, and tetraethyl titanate.
Although the sealant will still cure without the addition of the catalyst, the addition of a catalyst may provide for faster curing times, which may be necessary in certain situations. It may also be desirable, in some instances, to add additional fillers, pigments, rheological agents and like.
Strength properties in the hot melt phase depends on the type and quantity of the hot melt resin, and also the filler selection. One preferred filler is talc. Other fillers can be used, as is known in the art 'Che range of fillers may be selected by one of skill i:n the art and added in an amount sufficient to impart the appropriate strength to the hot melt please, as well as to impart desirable application properties to the sealant. The sealant of the present invention should be easy to handle and apply to the insulating glass units The sealant of the present invention may be prepared in the following ~ 0 manner. Preferably, the thermoplastic hot melt resin, or mixtures thereof, is first * T~ad~rrrmsrk disposed in a mixing vessel at an elevated temperature. In one preferred embodiment, the mixing vessel is capable of carrying out mixing under a vacuum v and which further includes a mixer that comprises a variable speed, mufti-shaft unit, having a low speed sweep blade, a high speed disperser, and a low speed auger.
S The filler is then added to the hot melt resin and mixing begins at low speed.
Thereafter, the atmospheric curing resin, or mixtures thereof, to which additional filler has been added to form an atmospheric curing resin composition, is added to the mixture subsequent to turning on the vacuum. At the point the atmospheric curing resin composition is added, the mixing is conducted under vacuum so as to eliminate any exposure of the mixture to atmospheric conditions, and also to remove residual water from the raw materials, thereby improving package stability.
Small volume additives such as pigments, weatherability improvers and the like can be added before the introduction of the atmospheric curing resin composition, while any catalyst may be added after. The material is maintained under essentially dry conditions until such time as it is ready to be applied to the insulating glass unit. In other preferred embodiments, the mixing may be carried out under a blanket of dry, inert gas.
The edge sealant of the present invention is applied to the insulating glass unit at elevated temperatures, approximately 125-250°F in the form of a liquid or a paste. Thereafter the sealant rapidly but reversibly cools into a solid. The sealant then begins to cure to a permanent solid elastomer by reaction with atmospheric oxygen and/or moisture. The sealant of the present invention is applied to the unit as a single material, therefore eliminating the need to combine several components together at the point of application.
The present invention will best be illustrated by the following series of examples:
,F.~C~~MP I~E 1 CHARGE
M8TEB181. ,~T ~ WEIGHT PRO D 1R .
Note: Preheat the pot to 180 F. Maintain that temperature throughout the process.
1. Chlorinated 120.0 Ibs 6.0%a Charge. Mix at Plasticizer low speed.
2. Epoxidized 100.0 lbs S.0% Charge.
Soya Oil 3. Solid Chlorinated760.0 Ibs 38.0% Charge. Turn Paraffin ondisperser at medium speed.
Continue mixing until the material becomes fluid.
4. Carbon Bhack 94.0 Ibs 4. 7 % Charge one bag at a time.
5. Talc 520.0 !bs 26.0 % Charge one bag at a time.
Turn on vacuum.
Mix with low speed blades at low setting and dispersion at medium speed for 30 minutes.
Turn on vacuum.
Mix with low speed blades at low setting and dispersion at medium speed for 30 minutes.
6. Atmospheric 404.0 lbs 20.2 % Charge. Turn Curing Resin on vacuum.
Composition* Mix at low speed alt blades for 15 minutes.
Moisture content test.
Composition* Mix at low speed alt blades for 15 minutes.
Moisture content test.
7. Dibutyltin 2.0 Ibs Q,~,~ Charge. Tltrn C>ilaurate on vacuum.
Then close vacuum.
Mix at low speed atl blades for 15 minutes.
2000.0 100.0%
A preferred chlorinated plasticize°' is a 52'!o chlorine, long chain normal paraffin (Cerechlor*S52, ICl). A preferred epoxidized soy: oil is a high molecular weight soybean oil epoxide (Paraplex*C:-62, Rohm and Haas). A preferred solid chlorinated paraffin is a 70% chlorine, long chain normal paraffin (Chlorez*700-S, Dover <'hemical).
yam ~~rt .r. .c CHARGE
WEIGHT % WEIGHT PROC
Note: Preheat the pot to 180F. Maintain that temperature throughout the process.
1. Chlorinated 86.0 Ibs 5.0% Charge. Mix at low Plasticizer speed. Save 5 Ibs for step 9.
2. Polyisobutylene172.0 Ibs 8.6 % Charge.
3. Solid Chlorinated947.0 Ibs 47.3 % Charge one bag at a time.
Paraffin Turn on disperser at medium speed. Continue mixing until the material becomes fluid.
4. Carbon Black 17.0 lbs 1.0% Charge one bag at a time.
5. Talc 207.0 lbs 10.3 % Charge one bag at a time.
Turn on vacuum. Mix with low speed blades at low setting dispersion at medium speed for 30 minutes.
6. Atmospheric 517.0 Ibs 27.63 % Charge. Turn on vacuum.
Curing Resin Composition* Mix at low speed all blades for 15 minutes.
7. Dibutyltin Dilaurate,1. 55 9.0 0.17 % Slurry with 5 Ibs of firms chlorinated plasticizer from step 1. Turn on vacuum. Then close vacuum. Mix at low speed all blades for 15 minutes.
2001.0 100.0%
A preferred polyisobutylene is a low molecular weight polyisobutylene (Vistanex LM, Exxon). ..
II
*ATMOSp~-]FR IC CL1_R_INGIt,E~IN POSITION
COM
CHARGE
~~j=,g~, ]~~ % WEIGHT PROCEDIIRF
1. Permapoi*MS 9SU.0 Ibs 58.3% Charge. Mix at Pol'~mer low speed.
2. Organo Functional13.5 Ibs U.8 % Charge.
Silane ~ 1 3. Organo Functional13.5 lbs U.8 % Charge.
Silane fi~2 4. Talc ~~ 4U.t)% Charge one bag at a time.
Turn on vacuum.
Mix to uniformity. Moisture content test.
1629.0 100.0% .
1'he first oganu functional silane is preferably vinyl silane, or vinyltrimethoxysilane (A-171, OSI).
'fhe second orl;ano functional silane is preferably epoxy silane, or glycidoxypropyltrimethoxysilane (A-187, OSI), The two silanes are different at the organo functional end of the molecule.
* Trade-mark The foregoing discussion and examples are merely meant to illustrate particular embodiments of the invention, and are not meant to be limitations on the practice thereof. It is the following claims, including all equivalents, which define the scope of the invention.
What is claimed is:
r
Then close vacuum.
Mix at low speed atl blades for 15 minutes.
2000.0 100.0%
A preferred chlorinated plasticize°' is a 52'!o chlorine, long chain normal paraffin (Cerechlor*S52, ICl). A preferred epoxidized soy: oil is a high molecular weight soybean oil epoxide (Paraplex*C:-62, Rohm and Haas). A preferred solid chlorinated paraffin is a 70% chlorine, long chain normal paraffin (Chlorez*700-S, Dover <'hemical).
yam ~~rt .r. .c CHARGE
WEIGHT % WEIGHT PROC
Note: Preheat the pot to 180F. Maintain that temperature throughout the process.
1. Chlorinated 86.0 Ibs 5.0% Charge. Mix at low Plasticizer speed. Save 5 Ibs for step 9.
2. Polyisobutylene172.0 Ibs 8.6 % Charge.
3. Solid Chlorinated947.0 Ibs 47.3 % Charge one bag at a time.
Paraffin Turn on disperser at medium speed. Continue mixing until the material becomes fluid.
4. Carbon Black 17.0 lbs 1.0% Charge one bag at a time.
5. Talc 207.0 lbs 10.3 % Charge one bag at a time.
Turn on vacuum. Mix with low speed blades at low setting dispersion at medium speed for 30 minutes.
6. Atmospheric 517.0 Ibs 27.63 % Charge. Turn on vacuum.
Curing Resin Composition* Mix at low speed all blades for 15 minutes.
7. Dibutyltin Dilaurate,1. 55 9.0 0.17 % Slurry with 5 Ibs of firms chlorinated plasticizer from step 1. Turn on vacuum. Then close vacuum. Mix at low speed all blades for 15 minutes.
2001.0 100.0%
A preferred polyisobutylene is a low molecular weight polyisobutylene (Vistanex LM, Exxon). ..
II
*ATMOSp~-]FR IC CL1_R_INGIt,E~IN POSITION
COM
CHARGE
~~j=,g~, ]~~ % WEIGHT PROCEDIIRF
1. Permapoi*MS 9SU.0 Ibs 58.3% Charge. Mix at Pol'~mer low speed.
2. Organo Functional13.5 Ibs U.8 % Charge.
Silane ~ 1 3. Organo Functional13.5 lbs U.8 % Charge.
Silane fi~2 4. Talc ~~ 4U.t)% Charge one bag at a time.
Turn on vacuum.
Mix to uniformity. Moisture content test.
1629.0 100.0% .
1'he first oganu functional silane is preferably vinyl silane, or vinyltrimethoxysilane (A-171, OSI).
'fhe second orl;ano functional silane is preferably epoxy silane, or glycidoxypropyltrimethoxysilane (A-187, OSI), The two silanes are different at the organo functional end of the molecule.
* Trade-mark The foregoing discussion and examples are merely meant to illustrate particular embodiments of the invention, and are not meant to be limitations on the practice thereof. It is the following claims, including all equivalents, which define the scope of the invention.
What is claimed is:
r
Claims (12)
1. In an insulating glass unit having a first glazing pane maintained in a spaced apart relation with a second glazing pane by a spacer, an edge sealant for said insulating glass unit, said sealant comprising:
a thermoplastic hot melt resin, said thermoplastic hot metal resin having a melt temperature of 125-250°F, and an atmosphere curing resin, said atmospheric curing resin polymerizing upon exposure to a component of the atmosphere, said component comprising a compound selected from the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin selected from moisture-curing urethanes comprising silicon functionalities, moisture-curing polysulfides comprising silicon functionalities, oxygen-curing polysulfides comprising silicon functionalities, alkoxysilane-terminated polyurethanes, alkoxysilane terminated polythioethers, mixtures of alkoxysilane-terminated polyurethanes and organofunctional silanes, and mixtures thereof, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above 68-77°F when uncured, reversibly solidifies upon cooling to a temperature of 68-77°F, and irreversibly solidifies upon subsequent exposure to said component of the atmosphere.
a thermoplastic hot melt resin, said thermoplastic hot metal resin having a melt temperature of 125-250°F, and an atmosphere curing resin, said atmospheric curing resin polymerizing upon exposure to a component of the atmosphere, said component comprising a compound selected from the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin selected from moisture-curing urethanes comprising silicon functionalities, moisture-curing polysulfides comprising silicon functionalities, oxygen-curing polysulfides comprising silicon functionalities, alkoxysilane-terminated polyurethanes, alkoxysilane terminated polythioethers, mixtures of alkoxysilane-terminated polyurethanes and organofunctional silanes, and mixtures thereof, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above 68-77°F when uncured, reversibly solidifies upon cooling to a temperature of 68-77°F, and irreversibly solidifies upon subsequent exposure to said component of the atmosphere.
2. The sealant of claim 1, wherein said thermoplastic hot melt resin comprises 10-90% by weight of said sealant.
3. The sealant of claim 1, wherein said atmospheric curing resin comprises 5-50% by weight of said sealant.
4. A one-part edge sealant, said sealant comprising:
a thermoplastic hot melt resin, said thermoplastic hot melt resin having a melt temperature of 125-250°F, and an atmospheric curing resin, said atmospheric curing resin polymerizing upon exposure to a component of the atmosphere, said component comprising a compound selected from the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin selected from moisture-curing urethanes comprising silicon functionalities, moisture-curing polysulfides comprising silicon functionalities, oxygen-curing polysulfides comprising silicon functionalities, alkoxysilane-terminated polyurethanes, alkoxysilane terminated polythioethers, mixtures of alkoxysilane-terminated polyurethanes and organofunctional silanes, silicon-functionalized acrylonitrile butadiene copolymers, and mixtures thereof, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above 68-77°F when uncured, reversibly solidifies upon cooling to a temperature of 68-77°F, and irreversibly solidifies upon subsequent exposure to said component of the atmosphere.
a thermoplastic hot melt resin, said thermoplastic hot melt resin having a melt temperature of 125-250°F, and an atmospheric curing resin, said atmospheric curing resin polymerizing upon exposure to a component of the atmosphere, said component comprising a compound selected from the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin selected from moisture-curing urethanes comprising silicon functionalities, moisture-curing polysulfides comprising silicon functionalities, oxygen-curing polysulfides comprising silicon functionalities, alkoxysilane-terminated polyurethanes, alkoxysilane terminated polythioethers, mixtures of alkoxysilane-terminated polyurethanes and organofunctional silanes, silicon-functionalized acrylonitrile butadiene copolymers, and mixtures thereof, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above 68-77°F when uncured, reversibly solidifies upon cooling to a temperature of 68-77°F, and irreversibly solidifies upon subsequent exposure to said component of the atmosphere.
5. The sealant of claim 4, wherein said thermoplastic hot melt resin comprises a compound selected from the group consisting of polyethylenes, polyolefins, polyvinyl acetate, polyamides, hydrocarbon resins, asphalts, bitumens, waxes, paraffins, crude rubbers, fluorinated rubbers, polyvinyl chloride, polyamides, fluorocarbons, polystyrene, polypropylenes, cellulosic resins, acrylic resins, thermoplastic elastomers, styrene butadiene resins, polyterpenes, ethylene propylene dime monomer, and mixtures thereof.
6. The sealant of claim 4, wherein said thermoplastic hot melt resin comprises a compound selected form the group consisting of solid chlorinated paraffin, polyisobutylene, epoxidized soya oil, and mixtures thereof.
7. The sealant of claim 4, wherein said atmospheric curing resin comprises a compound selected from moisture curing urethanes comprising silicon functionalities, moisture curing polysulfides comprising silicon functionalities, oxygen curing polysulfides comprising silicon functionalities, and mixtures thereof.
8. The sealant of claim 4, wherein said atmospheric curing resin comprises a compound selected from alkoxy silane terminated polyurethanes, alkoxy silane terminated polyethers, mixtures of alkoxy silane terminated polyurethanes and organo functional silanes, and mixtures thereof.
9. The sealant of claim 4, wherein said thermoplastic hot melt resin also functions as said atmospheric curing resin.
10. The sealant of claim 9, wherein said thermoplastic hot melt resin and said atmospheric curing resin comprise a compound selected from high molecular weight silicon terminated urethane prepolymers and silicon-functionalized acrylonitrile butadiene copolymers.
11. The sealant of claim 4, further comprising a compound selected from the group consisting of plasticizers, fillers, pigments, catalysts, weatherability improvers, and mixtures thereof.
12. A one-part edge sealant, said sealant comprising:
10-90% by weight of said sealant of a thermoplastic hot melt resin, said hot melt resin comprising a compound selected from the group consisting of solid chlorinated paraffin, epoxidized soya oil, polyisobutylene, and mixtures thereof, and 5-50% by weight of said sealant of an atmospheric curing resin which polymerizes upon exposure to a component of the atmosphere, said component comprising a compound selected from the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin comprising a compound selected from an alkoxy silane terminated polyurethane, and a mixture of an alkoxy silane terminated polyurethane and an organo functional silane, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above 68-77°F when uncured, reversibly solidifies upon cooling to a temperature of 68-77°F, and irreversibly solidifies upon subsequent exposure to said component of the atmosphere.
10-90% by weight of said sealant of a thermoplastic hot melt resin, said hot melt resin comprising a compound selected from the group consisting of solid chlorinated paraffin, epoxidized soya oil, polyisobutylene, and mixtures thereof, and 5-50% by weight of said sealant of an atmospheric curing resin which polymerizes upon exposure to a component of the atmosphere, said component comprising a compound selected from the group consisting of oxygen vapor, water vapor, and mixtures thereof, said atmospheric curing resin comprising a compound selected from an alkoxy silane terminated polyurethane, and a mixture of an alkoxy silane terminated polyurethane and an organo functional silane, said atmospheric curing resin being combined with said thermoplastic hot melt resin as a single material, whereby said sealant is in a liquid phase at a temperature above 68-77°F when uncured, reversibly solidifies upon cooling to a temperature of 68-77°F, and irreversibly solidifies upon subsequent exposure to said component of the atmosphere.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/548,086 | 1995-10-25 | ||
| US08/548,086 US5849832A (en) | 1995-10-25 | 1995-10-25 | One-component chemically curing hot applied insulating glass sealant |
| PCT/US1996/016960 WO1997015619A1 (en) | 1995-10-25 | 1996-10-23 | One-component chemically curing hot applied insulating glass sealant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2234668A1 CA2234668A1 (en) | 1997-05-01 |
| CA2234668C true CA2234668C (en) | 2005-12-20 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002234668A Expired - Fee Related CA2234668C (en) | 1995-10-25 | 1996-10-23 | One-component chemically curing hot applied insulating glass sealant |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2234668C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111892901A (en) * | 2019-05-05 | 2020-11-06 | 郑州大学 | Fast-curing two-component polyurethane sealant for hollow glass and preparation method thereof |
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1996
- 1996-10-23 CA CA002234668A patent/CA2234668C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CA2234668A1 (en) | 1997-05-01 |
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