Room temperature-cured siloxane sealant compositions of reduced gas permeability
First Claim
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1. A curable sealant composition comprising:
- (a) diorganopolysiloxane exhibiting permeability to gas, wherein the diorganopolysiloxane ranges in amount of from about 50 weight percent to about 99 weight percent of the total composition;
(b) at least one polymer having a permeability to gas that is less than the permeability of diorganopolysiloxane polymer (a);
(c) cross-linker; and
,(d) catalyst for the cross-linker reaction 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, wherein said curable sealant composition, once cured has a permeability to argon of no more than about 800 barrer units at 25 degrees C. and under 100 psi pressure,said composition containing at least one adhesion promoter in an amount of from about 0.5 weight percent to about 20 weight percent of the total composition and further comprising a clay filler, wherein the clay is selected from the group consisting of montmorillonite, sodium montmorilloriite, 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, and mixtures thereof.
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Abstract
The present invention provides for a room temperature cured silicone thermoplastic resin sealant composition with reduced gas permeability useful in the manufacture of glazing such as windows and doors.
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Citations
53 Claims
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1. A curable sealant composition comprising:
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(a) diorganopolysiloxane exhibiting permeability to gas, wherein the diorganopolysiloxane ranges in amount of from about 50 weight percent to about 99 weight percent of the total composition; (b) at least one polymer having a permeability to gas that is less than the permeability of diorganopolysiloxane polymer (a); (c) cross-linker; and
,(d) catalyst for the cross-linker reaction 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, wherein said curable sealant composition, once cured has a permeability to argon of no more than about 800 barrer units at 25 degrees C. and under 100 psi pressure,said composition containing at least one adhesion promoter in an amount of from about 0.5 weight percent to about 20 weight percent of the total composition and further comprising a clay filler, wherein the clay is selected from the group consisting of montmorillonite, sodium montmorilloriite, 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, and mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A curable sealant composition comprising:
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(a) diorganopolysiloxane exhibiting permeability to gas, wherein the diorganopolysiloxane ranges in amount of from about 50 weight percent to about 99 weight percent of the total composition; (b) at least one polymer having a permeability to gas that is less than the permeability of diorganopolysiloxane polymer (a); (c) cross-linker; and (d) catalyst for the cross-linker reaction 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 radicalswherein 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. - View Dependent Claims (27)
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28. A curable sealant composition comprising:
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(a) dioreanopolysiloxane exhibiting permeability to gas, wherein the diorganopolysiloxane polymer, component (a), is a silanol terminated diorganopolysiloxane; (b) at least one polymer having a permeability to gas that is less than the permeability of diorganoyolvsiloxane polymer (a); (c) cross-linker; and
,(d) catalyst for the cross-linker reaction 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, wherein said curable sealant composition, once cured has a permeability to argon of no more than about 800 barrer units at 25 degrees C. and under 100 psi pressure, 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. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A curable sealant composition comprising:
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(a) diorganonolysiloxane exhibiting permeability to gas, wherein the diorganopolysiloxane polymer, component (a), is a silanol terminated diorganonolvsiloxane; (b) at least one polymer having a permeability to gas that is less than the permeability of diorganovolysiloxane polymer (a); (c) cross-linker; and
,(d) catalyst for the cross-linker reaction 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, wherein said curable sealant composition, once cured has a permeability to argon of no more than about 800 barrer units at 25 degrees C. and under 100 psi pressure,said composition containing at least one adhesion Promoter in an amount of from about 0.5 weight percent to about 20 weight percent of the total composition and further comprising a clay, wherein the clay is selected from the group consisting 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, and mixtures thereof. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53)
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Specification