Insulated glass unit possessing room temperature-cured siloxane sealant composition of reduced gas permeability

• US 20070116907A1
• Filed: 11/18/2005
• Published: 05/24/2007
• Est. Priority Date: 11/18/2005
• Status: Abandoned Application

• Current Assignee: Momentive Performance Materials Incorporated
• Original Assignee: Momentive Performance Materials Incorporated
• Inventors: Kumar, Vikram, Williams, David, Ramakrishnan, Indumathi, Nesakumar, Edward, Landon, Shayne, Shelukar, Sachin
• Application Number:
  US11/283,382
• Publication Number:
  US 20070116907A1
• 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

Abstract

The invention relates to an insulated glass unit having an increased service life. Wherein an outer glass pane and inner glass pane are sealed to a spacer to provide an improved gas impermeable space.

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 gas sealant element including a curable sealant composition comprised of a) diorganopolysiloxane exhibiting permeability to said gas;

b) at least one polymer having a permeability to said gas that is less than the permeability of diorganopolysiloxane polymer;

c) cross-linker; and

, d) catalyst for the cross-linker reaction.

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 (PMPS), 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 containing at least one optional component selected from the group consisting of filler, adhesion promoter, non-ionic surfactant.

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

9. The insulated glass unit of claim 8 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.

10. The insulated glass unit of claim 7 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

-glycidbxyethyltrimethoxysilane, β

-(3,4-epoxycyclohexyl)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.

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

12. The insulated glass unit of claim 11 wherein the a diorganopolysiloxane polymer, component (a), ranges from in amount from about 60 weight percent to about 95 weight percent of the total composition.

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

14. The insulated glass unit of claim 13 wherein the polymer, component (b), ranges from in amount from about 5 weight percent to about 40 weight percent of the total composition.

15. The insulated glass unit of claim 7 wherein the filler is 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, d 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 .

16. The insulated glass unit of claim 7 wherein the non-ionic surfactant selected from the group of surfactants 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.

17. The insulated glass unit of claim 16 wherein the non-ionic surfactant 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.

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

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

20. The insulated glass unit of claim 7 wherein the amount of filler ranges in amount from 0 to about 80 weight percent of the total composition.

21. The insulated glass unit of claim 7 wherein the amount of adhesion promoter ranges in amount from about 0.5 weight percent to about 20 weight percent of the total composition.

22. The insulated glass unit of claim 15 wherein the clay is selected from one or more of montmorillonite, sodium montmorillonite, calcium montmorillonite, magnesium montmorillonite, nontronite, beidellite, volkonskoite, laponite, hectorite, saponite, sauconite, magadite, kenyaite, sobockite, svindordite, stevensite, vermiculite, halloysite, aluminate oxides, hydrotalcite, illite, rectorite, tarosovite, ledikite, and kaolinite.

23. The insulated glass unit of claim 22 wherein the clay is modified with an amine compounds or ammonium ion having the structure R³R⁴R⁵N, wherein R³, R⁴, and R⁵ are C₁ to C₃₀ 30 alkyls or alkenes, and mixtures thereof.

24. The insulated glass unit of claim 23 wherein R³, R⁴, and R⁵ are C₁ to C₂₀ alkyls or alkenes, and mixtures thereof.

25. The insulated glass unit of claim 24 wherein clay is modified with a tertiary amine wherein R³ is a C₁₄ to C₂₀ alkyl or alkene, and mixtures thereof.

26. The insulated glass unit of claim 25 wherein R⁴ and or R⁵ is a C₁₄ to C₂₀ alkyl or alkene, and mixtures thereof.

27. The sealant composition of claim 22 wherein the clay is modified with an amine or ammonium ion having the structure R⁶R⁷R⁸N, wherein at least one R⁶, R⁷, and R⁸ is C₁ to C₃₀ alkoxy silanes and the remaining are C₁ to C₃₀ alkyls or alkenes.

28. The sealant composition of claim 27 wherein at least one of R⁶, R⁷ and R⁸ is a C₁ to C₂₀ alkoxy silanes and the remaining are C1 to C₂₀ alkyls or alkenes.

29. The insulated glass unit of claim 22 wherein the clay is 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.

30. 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 said composition.

31. The insulated glass unit of claim 1 wherein the gas is a transparent insulating gas.

32. The insulated glass unit of claim 31 wherein the gas is selected from the group consisting of air, carbon dioxide, sulfur hexafloride, nitrohen, argon, krypton, xenon, and mixtures thereof.

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

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

35. The insulated glass unit of claim 33 wherein the primary sealant is a rubber based material.

36. The insulated glass unit of claim 34 wherein the glazing bead is a silicone or butyl material.

37. The sealant composition of claim 1 wherein the cross-linkers (c) 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.