Solvent resistant room temperature vulcanizable silicone rubber composition
First Claim
1. A solvent resistant room temperature vulcanizable silicone rubber composition comprising (A) 100 parts of a vinyl-containing polymer of the formula, ##STR19## where Vi is vinyl, R is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms and phenyl, R'"'"' is perfluoroalkyl of 1 to 8 carbon atoms, x and y are at least 1 and the viscosity of the compound varies from 1,000 to 200,000 centipoise at 25°
- C, and the concentration of siloxy units taken y times varies from 5 to 98 mole percent;
(ii) from 0.1 to 50 parts per million of the total composition of a platinum catalyst, and (B) from 1 to 50 parts based on 100 parts of the mixture (A) of a cross-linking polymer selected from the class consisting of (iii) a resin having ##STR20## and SiO2 units where the R to Si ratio varies from 1.0 to 2.7;
(vi) a resin havingSiO2 units and RR" SiO units where the R to Si ratio varies from 1.2 to 2.7 and (v) a polymer of the formula ##STR21## where R,R'"'"' are as previously defined, s is at least 1, t and z may be zero or a positive integer and the viscosity of the polymer varies from 10 to 1000 centipoise at 25°
C, where the concentration of siloxy units taken t times varies from 0 to 75 mole percent, and R" is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms and --CH2 CH2 R'"'"' radicals and in (A) (vi) from 1 to 85 parts per 100 parts of polymer (i) of a vinyl-containing compound of the formula, ##STR22## where, R, Vi, R'"'"' are as previously defined;
v and w are at least 1, and the concentration of the Vi (R)2 SiO0.5 units with respect to the total terminal units in the polymer varies from 20 to 100 mole percent and the viscosity of the polymer ranges from 100 to 20,000 centipoise at 25°
C.
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Abstract
A solvent resistant room temperature vulcanizable silicone rubber composition comprising a blend of vinyl-terminated polysiloxanes having from 2 to 98 mole percent of alkylperfluoroalkylalkylene siloxy units in the polymer chain, a hydride cross-linking agent selected from the class consisting of hydride-containing resins composed of mono-functional units and tetrafunctional units and hydride-containing polysiloxanes or a mixture of the above cross-linking agents which composition is cured in the presence of a platinum catalyst.
The above composition cures to an elastomer at room temperature or elevated temperatures. Preferably, there is incorporated into the composition a treated filler which gives the cured elastomer physical strength properties.
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Citations
20 Claims
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1. A solvent resistant room temperature vulcanizable silicone rubber composition comprising (A) 100 parts of a vinyl-containing polymer of the formula, ##STR19## where Vi is vinyl, R is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms and phenyl, R'"'"' is perfluoroalkyl of 1 to 8 carbon atoms, x and y are at least 1 and the viscosity of the compound varies from 1,000 to 200,000 centipoise at 25°
- C, and the concentration of siloxy units taken y times varies from 5 to 98 mole percent;
(ii) from 0.1 to 50 parts per million of the total composition of a platinum catalyst, and (B) from 1 to 50 parts based on 100 parts of the mixture (A) of a cross-linking polymer selected from the class consisting of (iii) a resin having ##STR20## and SiO2 units where the R to Si ratio varies from 1.0 to 2.7;
(vi) a resin havingSiO2 units and RR" SiO units where the R to Si ratio varies from 1.2 to 2.7 and (v) a polymer of the formula ##STR21## where R,R'"'"' are as previously defined, s is at least 1, t and z may be zero or a positive integer and the viscosity of the polymer varies from 10 to 1000 centipoise at 25°
C, where the concentration of siloxy units taken t times varies from 0 to 75 mole percent, and R" is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms and --CH2 CH2 R'"'"' radicals and in (A) (vi) from 1 to 85 parts per 100 parts of polymer (i) of a vinyl-containing compound of the formula, ##STR22## where, R, Vi, R'"'"' are as previously defined;
v and w are at least 1, and the concentration of the Vi (R)2 SiO0.5 units with respect to the total terminal units in the polymer varies from 20 to 100 mole percent and the viscosity of the polymer ranges from 100 to 20,000 centipoise at 25°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 19)
- C, and the concentration of siloxy units taken y times varies from 5 to 98 mole percent;
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10. A process for forming a solvent resistant silicone elastomer comprising (a) mixing (A) 100 parts of a mixture composed of (i) 100 parts of a vinyl-containing polymer of the formula:
- ##STR23## where Vi is a vinyl, R is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms and phenyl, R'"'"' is perfluoroalkyl of 1 to 8 carbonatoms, x and y are at least 1, and the viscosity of the compound varies from 1,000 to 200,000 centipoise at 25°
C, and the concentration of siloxy unis taken y varies from 5 to 98 mole percent;
(ii) from 0.1 to 50 parts per million of the total composition of a platinum catalyst;
with (B) from 1 to 50 parts based on 100 parts of the mixture (A) of a cross-linking polymer selected from the class consisting of (iii) a resin having ##STR24## and SiO2 units where the R to Si ratio varies from 1.0 to 2.7 (iv) a resin having ##STR25## SiO2 units and RR"SiO units where the R to Si ratio varies from 1.2 to 2.7; and
(v) a polymer of the formula, ##STR26## and mixtures thereof where the concentration of the units taken t times varies from 0 to 75 mole percent where R, R'"'"' are as previously defined, s is at least 1, t and z may be zero or a positive integer and the viscosity of the polymer varies from 10 to 1000 centipoise at 25°
C and R" is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms and --CH2 CH2 R'"'"' radicals and in (A) (vi) from 1 to 85 parts per 100 parts of polymer (i) of a vinyl-containing compound of the formula, ##STR27## where R, Vi, R'"'"' are as previously defined, v and w are at least 1 and the concentration of the Vi (R)2 SiO0.5 units with respect to the total terminal units in the polymer varies from 20 to 100 mole percent and the viscosity of the polymer ranges from 100 to 20,000 centipoise at 25°
C and (b) allowing the mixture to cure. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 20)
- ##STR23## where Vi is a vinyl, R is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms and phenyl, R'"'"' is perfluoroalkyl of 1 to 8 carbonatoms, x and y are at least 1, and the viscosity of the compound varies from 1,000 to 200,000 centipoise at 25°
Specification