Coatings containing silicone mist suppressant compositions
AssigneeDow Corning Corporation
InventorsJoseph Norbert Clark, Paul Cornelius Van Dort
Life of this patent
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Abstract
This invention relates to silicone coating composition comprising a solventless silicone coating composition and a liquid silicone mist suppressant composition obtained by a method comprising reacting at least one organohydrogensilicon compound containing at least two silicon-bonded hydrogen groups with a large excess of at least one organoalkenylsiloxane containing at least three silicon-bonded alkenyl groups in the presence of a platinum group metal-containing catalyst.
Claims45
A silicone coating composition comprising:
- (A) a solventless silicone coating composition selected from compositions comprising
- (A′)(i) an organosilicon compound containing at least two silicon-bonded alkenyl groups per molecule, (ii) an organohydrogensilicon compound containing at least two silicon-bonded hydrogen atoms per molecule, the ratio of the number of silicon-bonded hydrogen atoms of (ii) to the number of silicon-bonded alkenyl groups of (i) is from 0.5:1 to 4.5:1, (iii) a platinum group metal-containing catalyst, and (iv) an inhibitor, or
- (A″)(I) an organosilicon compound having at least two groups selected from the group consisting of epoxy groups, vinyl ether groups, acrylamide groups, and acrylate groups;
- and (II) an initiator;
- and
- (B) a liquid silicone mist suppressant composition having a viscosity of from 150 to 50,000 millipascal-seconds (mPa·s) (1 millipascal-second=1 centipoise) obtained by a method comprising mixing:
- (a) at least one organohydrogensilicon compound containing at least two silicon-bonded hydrogen groups per molecule;
- (b) at least one organoalkenylsiloxane containing at least three silicon-bonded alkenyl groups per molecule, and (c) a platinum group metal-containing catalyst which is present in an amount sufficient to provide 1 to 250 weight parts of platinum group metal per million weight parts of (a)+(b), with the proviso that the ratio of the number of silicon-bonded hydrogen atoms of Component (a) to the number of silicon-bonded alkenyl groups of Component (b) is less than or equal to 1:4.6.
A silicone coating composition comprising:
- (A) an organosilicon compound containing at least two silicon-bonded alkenyl groups per molecule;
- and
- (B) a liquid silicone mist suppressant composition having a viscosity of from 150 to 50,000 millipascal-seconds(mPa·s) (1 millipascal-second=1 centipoise) obtained by a method comprising mixing:
- (a) at least one organohydrogensilicon compound containing at least two silicon-bonded hydrogen groups per molecule, (b) at least one organoalkenylsiloxane containing at least three silicon-bonded alkenyl groups per molecule, and (c) a platinum group metal-containing catalyst which is present in an amount sufficient to provide 1 to 250 weight parts of platinum group metal per million weight parts of (a)+(b), with the proviso that the ratio of the number of silicon-bonded hydrogen atoms of Component (a) to the number of silicon-bonded alkenyl groups of Component (b) is less than or equal to 1:4.6, and further provided that the organosilicon compound used for Component (A) is different from the organoalkenylsiloxane used for Component (B)(b).
A method of reducing mist in a silicone coating composition comprising adding to a solventless silicone coating composition a liquid silicone mist suppressant composition having a viscosity of from 150 to 50,000 millipascal-seconds (1 millipascal second=1 centipoise) obtained by a method comprising mixing:
- (a) at least one organohydrogensilicon compound containing at least two silicon-bonded-hydrogen-groups per molecule, (b) at least one organoalkenylsiloxane containing at least three silicon-bonded alkenyl groups per molecule, and (c) a platinum group metal-containing catalyst which is present in an amount sufficient to provide 1 to 250 weight parts of platinum group metal per million weight parts of (a)+(b), with the proviso that the ratio of the number of silicon-bonded hydrogen atoms of Component (a) to the number of silicon-bonded alkenyl groups of Component (b) is less than or equal to 1:4.6.
Dependencies are inferred from the claim text.