Method of improving shelf life of silicone elastomeric sealant
AssigneeDow Corning Corporation
InventorsJerome M. Klosowski, Michael D. Meddaugh
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Abstract
The method of this invention produces an elastomeric silicone sealant having an improved shelf life. The sealant comprises an alkoxysilethylene ended polydiorganosiloxane polymer, an alkoxytrialkoxysilane crosslinker, and a titanium catalyst.
Claims11
The polymer having the formula
- where each R is free of aliphatic unsaturation and is of the group monovalent hydrocarbon, monovalent halohydrocarbon, and monovalent cyanoalkyl radicals of 1 to 18 inclusive carbon atoms, each R" is methyl, ethyl, propyl, or butyl, a is 0 is 1, and x is of a value such that the polymer has a viscosity of from 0.5 to 1000 Pa.s at 25.degree. C.
A method of improving the shelf life of a silicone sealant of the type containing an alkoxy functional polymer, alkoxy functional crosslinker, and titanium catalyst, wherein the improvement comprises using as the polymer a polymer of the formula ##STR19## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, a is 0 or 1, b is 1, c is from 1 to 6 and x is such that the viscosity is from 1 to 1000 Pa.s at 25.degree. C.
A method of improving the shelf life of silicone sealants based upon alkoxy functional polymers, alkoxy functional crosslinkers, and titanium catalysts, the improvement comprising
- (A) mixing in the absence of moisture
- (1) 100 parts by weight of a polymer of the formula ##STR20## where each R is free of aliphatic unsaturation and is of the group monovalent hydrocarbon, monovalent halohydrocarbon, and monovalent cyanoalkyl radicals of 1 to 18 inclusive carbon atoms, each R" is methyl, ethyl, propyl, or butyl, Z is a radical of the formula. ##STR21## a is 0 or 1, and x is of a value such that the polymer has a viscosity of from 0.5 to 3000 pa.s at 25.degree. C.,
- (2) from 0.35 to 9.0 parts by weight of a crosslinker of the formula
- R'.sub.a Si(OR").sub.4-a
- where R' is methyl or phenyl, R" is methyl, ethyl, propyl, or butyl, and a is 0 or 1, and
- (3) from 0.2 to 0.6 parts by weight of titanium catalyst, and
- (B) storing the mixture in the absence of moisture.
A method of improving the shelf life of a silicone sealant of the type containing an alkoxy functional polymer, alkoxy functional crosslinker, and titanium catalyst, wherein the improvement comprises using as the polymer a polymer of the formula ##STR22## where each R is free of aliphatic unsaturation and is of the group monovalent hydrocarbon, monovalent halohydrocarbon, and monovalent cyanoalkyl radicals of 1 to 18 inclusive carbon atoms, each R" is methyl, ethyl, propyl, or butyl, a is 0 or 1, and x is of a value such that the polymer has a viscosity of from 0.5 to 1000 pa.s at 25.degree. C.
A method of improving the shelf life of silicone sealants based upon alkoxy functional polymers, alkoxy functional crosslinkers, and titanium catalysts, the improvement comprising
- (A) mixing in the absence of moisture
- (1) 100 parts by weight of a polymer of the formula ##STR23## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, a is 0 or 1, b is 1, c is from 1 to 6 and x is such that the viscosity is from 1 to 1000 Pa.s at 25.degree. C.
- (2) from 0.35 to 9.0 parts by weight of a crosslinker of the formula
- R'.sub.a Si(OR").sub.4-a
- where R' is methyl or phenyl, R" is methyl, ethyl, propyl, or butyl, and a is 0 or 1, and
- (3) from 0.2 to 0.6 parts by weight of titanium catalyst, and
- (B) storing the mixture in the absence of moisture.
Dependencies are inferred from the claim text.