Latently-curable organosilicone release coating composition
First Claim
1. A latently-curable organosilicone composition comprising the following components:
- (a) an ethylenically-unsaturated polysiloxane,(b) a polyhydrosiloxane,(c) an amount of a platinum- or other metal-containing hydrosilation catalyst sufficient to facilitate the reaction of components (a) and (b), and(d) an amount of an organic hydrosilation inhibitor sufficient to inhibit premature gelation of the mixture of components (a), (b), and (c) at low, ambient or room temperature but insufficient in amount to prevent hydrosilation of the mixture at an elevated temperature, said organic hydrosilation inhibitor having the structural formula ##STR8## wherein R2 is ethynylene or cis-ethenylene;
R3 is a saturated or unsaturated organic group having 1 to 12 carbon atoms which is unsubstituted or substituted by 1 to 23 halogen atoms, and has up to 25 hydrogen atoms, and 0 to 5 non-peroxidic catenary oxygen atoms; and
X is --O-- or ##STR9## in which R4 is the same as defined for R3, and R3 and R4 together can form an alkylene group which with the N can form a 5- or 6-atom membered saturated azacyclic ring.
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Abstract
A latently-curable, organosilicone composition comprises a metal catalyzed organosilicone composition capable of undergoing hydrosilation and, as hydrosilation inhibitor, an organic monohydrogen derivative of an unsaturated aliphatic 1,4-dicarboxylic acid, i.e., maleic acid or acetylene dicarboxylic acid. The organic monohydrogen derivatives of use in this invention effectively inhibit catalyzed hydrosilation reactions at low or room temperature while allowing efficient hydrosilation reaction rates to occur at elevated temperatures. These monhydrogen derivatives perform their inhibitive function effectively at low concentration. The latently curable composition may be coated on a substrate to provide a release surface for an adjacent adhesive layer.
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Citations
19 Claims
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1. A latently-curable organosilicone composition comprising the following components:
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(a) an ethylenically-unsaturated polysiloxane, (b) a polyhydrosiloxane, (c) an amount of a platinum- or other metal-containing hydrosilation catalyst sufficient to facilitate the reaction of components (a) and (b), and (d) an amount of an organic hydrosilation inhibitor sufficient to inhibit premature gelation of the mixture of components (a), (b), and (c) at low, ambient or room temperature but insufficient in amount to prevent hydrosilation of the mixture at an elevated temperature, said organic hydrosilation inhibitor having the structural formula ##STR8## wherein R2 is ethynylene or cis-ethenylene; R3 is a saturated or unsaturated organic group having 1 to 12 carbon atoms which is unsubstituted or substituted by 1 to 23 halogen atoms, and has up to 25 hydrogen atoms, and 0 to 5 non-peroxidic catenary oxygen atoms; and X is --O-- or ##STR9## in which R4 is the same as defined for R3, and R3 and R4 together can form an alkylene group which with the N can form a 5- or 6-atom membered saturated azacyclic ring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 19)
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16. A kit for preparing a latently-curable organosilicone composition capable of undergoing hydrosilation and having component parts capable of being mixed when the composition is to be applied, said kit comprising the combination of
(1) a first package containing an ethylenically-unsaturated polysiloxane and an amount of a metal-containing hydrosilation catalyst sufficient to facilitate the hydrosilation reaction, and (2) a second package containing a polyhydrosiloxane and as hydrosilation inhibitor an amount of an organic hydrosilation compound sufficient to inhibit prematrue gelation of the organosilicone composition at low ambient or room temperature but insufficient in amount to prevent hydrosilation at an elevated temperature, said compound having the structural formula ##STR10## wherein R2 is ethynylene or cis-ethenylene; -
R3 is a saturated or unsaturated organic group having 1 to 12 carbon atoms which is unsubstituted or substituted by 1 to 23 halogen atoms, and has up to 25 hydrogen atoms, and 0 to 5 non-peroxidic catenary oxygen atoms; and X is --O-- or ##STR11## in which R4 is the same as defined for R3, and R3 and R4 together with the N can form a saturated azacyclic ring.
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17. A latently-curable organosilicone composition comprising the following components:
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(a) an ethylenically-unsaturated polysiloxane, (b) a polyhydrosiloxane, (c) an amount of a metal-containing catalyst sufficient to facilitate the reaction of components (a) and (b), and (d) an amount of an organic hydrosilation inhibitor sufficient to inhibit premature gelation of the mixture of components (a), (b), and (c) at low, ambient or room temperature but insufficient in amount to prevent hydrosilation of the mixture at an elevated temperature, said organic hydrosilation inhibitor having the structural formula ##STR12## wherein R2 is cis-ethenylene; R3 is a saturated or unsaturated organic group having 1 to 12 carbon atoms which is unsubstituted or substituted by 1 to 23 halogen atoms, and has up to 25 hydrogen atoms, and 0 to 5 non-peroxidic catenary oxygen atoms; and X is --O-- or ##STR13## in which R4 is the same as defined for R3, and R3 and R4 together can form an alkylene group which with the N can form a 5- or 6-atom membered saturated azacyclic ring. - View Dependent Claims (18)
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Specification