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US 5,629,399 AGranted
Fast curing organosiloxane compositions with long working times
AssigneeDow Corning Corporation
InventorsDonnie R. Juen, Kent R. Larson, Myron T. Maxson, Lawrence J. Rapson
Life of this patent
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Abstract
A room temperature curable organosiloxane composition, containing an alkenyl-containing polyorganosiloxane, an organohydrogensiloxane, a platinum catalyst, a methylvinylcyclosiloxane and an acetylenic alcohol, which exhibits a long working time and a fast cure time.
Claims11
A room temperature curable organosiloxane composition, comprising:
- (A) a curable polyorganosiloxane containing at least two alkenyl radicals per molecule;
- (B) an amount sufficient to cure said composition of an organohydrogensiloxane containing at least two silicon-bonded hydrogen atoms per molecule, wherein the sum of the alkenyl radical per molecule of (A) and the silicon-bonded hydrogen atoms per molecule of (B) is greater than 4;
- (C) an amount sufficient to promote curing of said composition of a platinum catalyst;
- (D) 0.03 to 0.6 weight percent, based on the combined weights of components (A) and (B), of a methylvinylcyclosiloxane;
- and
- (E) 0.002 to 0.03 weight percent, based on the combined weights of components (A) and (B) of an acetylenic alcohol;
- wherein the amounts of components (D) and (E) are selected such that the resulting composition has a working time of at least 15 minutes and a demold time of less than 5.5 hours.
4 more elements
An organosiloxane composition, comprising:
- (I) a base portion, comprising:
- (A) a curable polyorganosiloxane containing at least two alkenyl radicals per molecule;
- and
- (C) an amount sufficient to promote curing of said composition of a platinum catalyst;
- and
- (II) a curing agent portion, comprising:
- (B) an amount sufficient to cure said composition of an organohydrogensiloxane containing at least two silicon-bonded hydrogen atoms per molecule, where the sum of the alkenyl radical per molecule of (A) and the silicon-bonded hydrogen atoms per molecular of (B) is greater than 4;
- (D) 0.03 to 0.6 weight percent, based on the combined weights of components (A) and (B), of a methylvinylcyclosiloxane;
- and
- (E) 0.002 to 0.03 weight percent, based on the combined weights of components (A) and (B) of an acetylenic alcohol;
- wherein the composition that results when the base portion and the curing agent portion are mixed is room temperature curable and wherein the amounts of components (D) and (E) are selected such that the composition that results when the base portion and the curing agent portion are mixed has a working time of at least 15 minutes and a demold time of less than 5.5 hours.
8 more elements
An organosiloxane composition, comprising:
- (i) a catalyst-containing portion, comprising:
- (A) a curable polyorganosiloxane containing at least two alkenyl radicals per molecule;
- and
- (C) an amount sufficient to promote curing of said composition of a platinum catalyst;
- and
- (ii) a crosslinking-agent-containing portion, comprising:
- (B) an amount sufficient to cure said composition of an organohydrogensiloxane containing at least two silicon-bonded hydrogen atoms per molecule, where the sum of the alkenyl radical per molecule of (A) and the silicon-bonded hydrogen atoms per molecular of (B) is greater than 4;
- (D) 0.03 to 0.6 weight percent, based on the combined weights of components (A) and (B), of a methylvinylcyclosiloxane;
- (E) 0.002 to 0.03 weight percent, based on the combined weights of components (A) and (B) of an acetylenic alcohol;
- and
- wherein the composition that results when the catalyst-containing portion and the crosslinking-agent-containing portion are mixed is room temperature curable and wherein the amounts of components (D) and (E) are selected such that the composition that results when the catalyst-containing portion and the crosslinking-agent-containing portion are mixed has a working time of at least 15 minutes and a demold time of less than 5.5 hours.
8 more elements
An organosiloxane composition, comprising:
- (i) a catalyst-containing portion, comprising:
- (C) an amount sufficient to promote curing of said composition of a platinum catalyst;
- and
- (ii) a crosslinking-agent-containing portion, comprising:
- (A) a curable polyorganosiloxane containing at least two alkenyl radicals per molecule;
- (B) an amount sufficient to cure said composition of an organohydrogensiloxane containing at least two silicon-bonded hydrogen atoms per molecule, where the sum of the alkenyl radical per molecule of (A) and the silicon-bonded hydrogen atoms per molecular of (B) is greater than 4;
- (D) 0.03 to 0.6 weight percent, based on the combined weights of components (A) and (B), of a methylvinylcyclosiloxane;
- and
- (E) 0.002 to 0.03 weight percent, based on the combined weights of components (A) and (B) of an acetylenic alcohol;
- wherein the composition that results when the catalyst-containing portion and the crosslinking-agent-containing portion are mixed is room temperature curable and wherein the amounts of components (D) and (E) are selected such that the composition that results when the catalyst-containing portion and the crosslinking-agent-containing portion are mixed has a working time of at least 15 minutes and a demold time of less than 5.5 hours.
7 more elements
Dependencies are inferred from the claim text.