Insulated Glass Unit Possessing Room Temperature-Cured Siloxane Sealant Compositon of reduced gas permeability

• US 20100098888A1
• Filed: 12/04/2009
• Published: 04/22/2010
• Est. Priority Date: 11/18/2005
• Status: Active Grant

• Current Assignee: Momentive Performance Materials Incorporated (Momentive Performance Materials Holdings LLC)
• Original Assignee: Momentive Performance Materials Incorporated (Momentive Performance Materials Holdings LLC)
• Inventors: Shelukar, Sachin A., Nesakumar, Edward J., Kumar, Vikram, Williams, David A., Landon, Shayne J., Ramakrishnan, Indumathi
• Granted Patent: US 8,597,741 B2
• Time in Patent Office: Days
• US Class Current: 428/34
• CPC Class Codes: C03C 27/10 with the aid of adhesive specially adapted for that purpose
• CPC Class Codes: C08G 77/16 to hydroxyl groups
• CPC Class Codes: C08G 77/80 Siloxanes having aromatic substituents, e.g. phenyl side groups
• CPC Class Codes: C08L 23/00 Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: C09J 183/04 Polysiloxanes
• CPC Class Codes: E06B 3/66342 characterised by their sealed connection to the panes
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

The invention relates to an insulated glass unit having an increased service life. An outer glass pane and inner glass pane are sealed to a spacer to provide an improved gas impermeable space. The glass unit includes a curable two-part sealer composition which, upon curing, exhibits unexpectedly high adhesion to substrates.

Claims

1. An insulated glass unit comprising at least two spaced-apart sheets of glass in spaced relationship to each other, a low thermal conductivity gas therebetween and a gas sealant element including a two-part curable sealant composition wherein

Part 1 comprises (a) at least one first diorganopolysiloxane exhibiting a permeability to a gas or a mixture of gases wherein each end of the polymer chain of each of the first diorganopolysiloxanes is silanol terminated, wherein the viscosity of the silanol terminated first diorganopolysiloxanes can be from about 1,000 to 200,000 cps at 25 degrees C., and (b) a polymer exhibiting permeability to the gas or mixture of gases that is less than the permeability of the silanol terminated first diorganopolysiloxane (a);

and,

Part 2 comprises (c) at least one second diorganopolysiloxane wherein each end of the polymer chain of each of the second diorganopolysiloxane is trialkylsilyl terminated, (d) an alkylsilicate crosslinker, and (e) a crosslinking catalyst;

wherein said two-part curable sealant composition when cured has a permeability to argon of no more than about 900 barrer units at 25 degrees C. and under 100 psi pressure.

2. The insulated glass unit window of claim 1 wherein the diorganopolysiloxane polymer, component (a), is a silanol terminated diorganopolysiloxane having the formula:

M_aD_bD′

_c.

wherein a=2, b is equal to or greater than 1, c is zero or a positive integer;

M=(HO)_3-x-yR¹_xR²_ySiO_1/2;

wherein x=0, 1 or 2 and y is either 0 or 1, with the proviso that x+y is less than or equal to 2, R¹ and R² are monovalent C₁ to C₆₀ hydrocarbon radicals;

D=R³R⁴SiO_1/2;

wherein R³ and R⁴ are monovalent C₁ to C₆₀ hydrocarbon radicals; and

D′

=R⁵R⁶SiO_2/2;

wherein R⁵ and R⁶ are independently chosen monovalent C₁ to C₆₀ hydrocarbon radicals.

3. The insulated glass unit of claim 1 wherein polymer (b) is selected from the group consisting of low density polyethylene (LDPE), very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), polypropylene (PP), polyisobutylene (PIB), polyvinyl acetate (PVAc), polyvinyl alcohol (PVoH), polystyrene, polycarbonate, polyester, such as, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene napthalate (PEN), glycol-modified polyethylene terephthalate (PETG);

polyvinylchloride (PVC), polyvinylidene chloride, polyvinylidene floride, thermoplastic polyurethane (TPU), acrylonitrile butadiene styrene (ABS), polymethylmethacrylate (PMMA), polyvinyl fluoride (PVF), Polyamides (nylons), polymethylpentene, polyimide (PI), polyetherimide (PEI), polether ether ketone (PEEK), polysulfone, polyether sulfone, ethylene chlorotrifluoroethylene, polytetrafluoroethylene (PTFE), cellulose acetate, cellulose acetate butyrate, plasticized polyvinyl chloride, ionomers (Surtyn), polyphenylene sulfide (PPS), styrene-maleic anhydride, modified polyphenylene oxide (PPO), ethylene-propylene rubber (EPDM), polybutadiene, polychloroprene, polyisoprene, polyurethane (TPU), styrene-butadiene-styrene (SBS), styrene-ethylene-butadiene-styrene (SEEBS), polymethylphenyl siloxane (AMPS), and mixture thereof.

4. The insulated glass unit of claim 3 wherein polymer (b) is selected from the group consisting of low density polyethylene (LDPE), very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE), and mixtures thereof.

5. The insulated glass unit of claim 4 wherein polymer (b) is selected from the group consisting of low density polyethylene (LDPE), very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE), and mixture thereof.

6. The insulated glass unit of claim 5 wherein polymer (b) is linear low density polyethylene (LLDPE).

7. The insulated glass unit of claim 1 wherein the trialkylsilyl terminated second diorganopolysiloxane component (c) has the formula:

M_xD_yD¹_z

wherein x=2, y is equal to or greater than 1, z is zero or a positive integer;

M=R^aR^bR^cSiO_1/2

wherein R^a, R^b and R^c can be the same or different and are each individually selected from C₁ to C₆₀ alkyl hydrocarbon radicals,

D=R^dR^eSiO_1/2;

wherein R^d and R^e are independently chosen monovalent C₁ to C₆₀ hydrocarbon radicals; and

D¹=R^fR^gSiO_2/2;

wherein R^f and R^g are independently chosen monovalent C₁ to C₆₀ hydrocarbon radicals.

8. The insulated glass unit of claim 7 wherein the trialkylsilyl terminated second diorganopolysiloxane component (c) is trimethylsilyl terminated polydimethylsiloxane.

9. The insulated glass unit of claim 7 wherein Part 1 of the formulation also includes the trialkylsilyl terminated diorganopolysiloxane component (c).

10. The insulated glass unit of claim 9 wherein the trialkylsilyl terminated diorganopolysiloxane component (c) in both Part 1 and Part 2 of the formulation is trimethyl terminated polydimethylsiloxane.

11. The insulated glass unit of claim 1 containing at least one optional component selected from the group consisting of filler, adhesion promoter, non-ionic surfactant.

12. The insulated glass unit of claim 1 wherein the catalyst is a tin catalyst.

13. The insulated glass unit of claim 12 wherein the tin catalyst is selected from the group consisting of dibutyltindilaurate, dibutyltindiacetate, dibutyltindimethoxide tinoctoate, isobutyltintriceroate, dibutyltinoxide, solubilized dibutyl tin oxide, dibutyltin bis-diisooctylphthalate, bis-tripropoxysilyl dioctyltin, dibutyltin bis-acetylacetone, silylated dibutyltin dioxide, carbomethoxyphenyl tin tris-uberate, isobutyltin triceroate, dimethyltin dibutyrate, dimethyltin di-neodecanoate, triethyltin tartarate, dibutyltin dibenzoate, tin oleate, tin naphthenate, butyltintri-2-ethylhexylhexoate, tinbutyrate, diorganotin bis β

-diketonates and mixtures thereof.

14. The insulated glass unit of claim 11 wherein the adhesion promoter is selected from the group consisting of n-2-aminoethyl-3-aminopropyltrimethoxysilane, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate, γ

-aminopropyltriethoxysilane, γ

-aminopropyltrimethoxysilane, aminopropyltrimethoxysilane, bis-γ

-trimethoxysilypropyl)amine, N-Phenyl-γ

-aminopropyltrimethoxysilane, triaminofunctionaltrimethoxysilane, γ

-aminopropylmethyldiethoxysilane, γ

-aminopropylmethyldiethoxysilane, methacryloxypropyltrimethoxysilane, methylaminopropyltrimethoxysilane, γ

-glycidoxypropylethyldimethoxysilane, γ

-glycidoxypropyltrimethoxysilane, γ

-glycidoxyethyltrimethoxysilane, β

-(3,4-epoxycyclohexy)propyltrimethoxysilane, β

-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, isocyanatopropyltriethoxysilane, isocyanatopropylmethyldimethoxysilane, β

-cyanoethyltrimethoxysilane, γ

-acryloxypropyltrimethoxysilane, γ

-methacryloxypropylmethyldimethoxysilane, 4-amino-3,3,-dimethylbutyltrimethoxysilane, n-ethyl-3-trimethoxysilyl-2-methylpropanamine, and mixtures thereof.

15. The insulated glass unit of claim 11 wherein the weight ratio of Part 1 to Part 2 of the composition ranges from about 10:

1 to about 15;

1.

16. The insulated glass unit of claim 1 wherein the weight ratio of Part 1 to Part 2 of the composition ranges from about 12:

1 to about 13;

1.

17. The insulated glass unit of claim 1 wherein the silanol terminated diorganopolysiloxane polymer, component (a), ranges from an amount from about 50 weight percent to about 99 weight percent of the composition of Part 1.

18. The insulated glass unit of claim 1 wherein the amount of the polymer, component (b), ranges from about 1 weight percent to about 50 weight percent of the composition of Part 1.

19. The insulated glass unit of claim 1 wherein the trialkylsilyl terminated diorganopolysiloxane component (c) ranges in an amount of from 30% to about 90% by weight of the composition of Part 2.

20. The insulated glass unit of claim 11 wherein the composition includes one or more filler selected from the group consisting of clays, nano-clays, organo-clays, ground calcium carbonate, precipitated calcium carbonate, colloidal calcium carbonate, calcium carbonate treated with compounds stearate or stearic acid;

fumed silica, precipitated silica, silica gels, hydrophobized silicas, hydrophilic silica gels;

crushed quartz, ground quartz, alumina, aluminum hydroxide, titanium hydroxide, clay, kaolin, bentonite montmorillonite, diatomaceous earth, iron oxide, carbon black and graphite, talc, mica, and mixtures thereof.

21. The insulated glass unit of claim 11 wherein the composition including a non-ionic surfactant selected from the group consisting of polyethylene glycol, polypropylene glycol, ethoxylated castor oil, oleic acid ethoxylate, alkylphenol ethoxylates, copolymers of ethylene oxide and propylene oxide and copolymers of silicones and polyethers, copolymers of silicones and copolymers of ethylene oxide and propylene oxide and mixtures thereof, in an amount ranging from about 0.1 weight percent to about 10 weight percent of the total composition.

22. The insulated glass unit of claim 21 wherein the non-ionic surfactant is selected from the group of surfactants consisting of copolymers of ethylene oxide and propylene oxide, copolymers of silicones and polyethers, copolymers of silicones and copolymers of ethylene oxide and propylene oxide and mixtures thereof.

23. The insulated glass unit of claim 1 wherein the amount of the cross-linker, component (d), ranges in amount from about 0.1 weight percent to about 10 weight percent of the total composition.

24. The insulated glass unit of claim 1 wherein the amount of catalyst, component (e), ranges in amount from about 0.005 weight percent to about 1 weight percent of the total composition.

25. The insulated glass unit of claim 20 wherein the composition includes a clay modified with an amine compounds or ammonium ion having the structure R³ R⁴ R⁵N, wherein R³, R⁴, and R⁵ are C₁ to C₃₀ 30 alkyls or alkenes, and mixtures thereof.

26. The insulated glass unit of claim 20 wherein the sealant composition includes a clay modified with an amine or ammonium ion having the structure R⁶ R⁷ R⁸N, wherein at least one R⁶, R⁷, and R⁸ is C₁ to C₃₀ alkoxy silanes and the remaining are C₁ to C₃₀ alkyls or alkenes.

27. The insulated glass unit of claim 22 wherein the composition includes a clay modified with ammonium, primary alkylammonium, secondary alkylammonium, tertiary alkylammonium quaternary alkylammonium, phosphonium derivatives of aliphatic, aromatic or arylaliphatic amines, phosphines or sulfides or sulfonium derivatives of aliphatic, aromatic or arylaliphatic amines, phosphines or sulfides.

28. The insulated glass unit of claim 15 wherein the clay is present in an amount from about 0.1 to about 50 weight percent of the total composition.

29. The insulated glass unit of claim 1 wherein the gas is selected from the group consisting of air, carbon dioxide, sulfur hexafloride, nitrogen, argon, krypton, xenon, and mixtures thereof.

30. The insulated glass unit of claim 1 further comprising a primary sealant.

31. The insulated glass unit of claim 1 further comprising a glazing bead.

32. The insulated glass unit of claim 30 wherein the primary sealant is a rubber based material.

33. The insulated glass unit of claim 31 wherein the glazing bead is a silicone or butyl material.

34. The insulated glass unit of claim 1 wherein the cross-linkers (d) is an alkylsilicate having the formula:

(R¹⁴O) (R¹⁵O) (R¹⁶O) (R¹⁷O)Si

where R¹⁴, R¹⁵, R¹⁶ and R¹⁷ are chosen independently from monovalent C₁ to C₆₀ hydrocarbon radicals.

35. The insulated glass unit of claim 1 wherein the sealant composition is at least partially cured.

36. The insulated glass unit of claim 2 wherein the polymer (b) is a linear how density polyethylene and wherein part 1 of the composition further includes a nanoclay.