Room-temperature curable organopolysiloxane composition
First Claim
1. A room-temperature curable organopolysiloxane composition comprising:
- (I) 100 parts by weight of an organopolysiloxane that is a condensation reaction product of 100 parts by weight of a component (A) described below, and from 1 to 200 parts by weight of a component (B) described below, (A) an organopolysiloxane which comprises from R3SiO1/2 units (wherein, each R represents, independently, an unsubstituted or substituted monovalent hydrocarbon group of 1 to 6 carbon atoms) and SiO4/2 units, in which a number of mols of said R3SiO1/2 units relative to 1 mol of said SiO4/2 units is from 0.6 to 1.2 mols, and which further comprises both R2SiO2/2 units and RSiO3/2 units (wherein in each formula, R is as defined above), and the quantities of both of the R2SiO2/2 units and RSiO3/2 units are each within a range from 0.2 to 0.8 mols relative to 1 mol of said SiO4/2 units, and moreover comprises less then 2.0% by weight of hydroxyl groups bonded to silicon atoms, (B) a diorganopolysiloxane with molecular chain terminals blocked with functional group-containing silyl groups; and
(II) from 0.1 to 30 parts by weight of a silane compound containing two or more hydrolysable groups bonded to silicon atoms within one molecule, and/or a partial hydrolysis-condensation product thereof.
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Abstract
Provided is a room-temperature curable organopolysiloxane composition including (I) an organopolysiloxane, and (II) a silane compound containing silicon-bonded hydrolysable groups and/or a partial hydrolysis-condensation product thereof. The organopolysiloxane (I) is a condensation product of (A) an organosiloxane which includes R3SiO1/2 units wherein R represents an unsubstituted or substituted monovalent hydrocarbon group and SiO4/2 units, in which the molar ratio R3SiO1/2 to SiO4/2 is 0.6 to 1.2, and further includes less than 2.0% by weight of silicon-bonded hydroxyl groups, and (B) a diorganopolysiloxane with molecular chain terminals blocked with functional group-containing silyl groups. This composition generates a cured product or coating film with good transparency and good strength, which is useful as a coating material for electrical or electronic components or circuits, a sealant for liquid crystal display elements, and an antifouling paint for underwater structures.
18 Citations
4 Claims
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1. A room-temperature curable organopolysiloxane composition comprising:
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(I) 100 parts by weight of an organopolysiloxane that is a condensation reaction product of 100 parts by weight of a component (A) described below, and from 1 to 200 parts by weight of a component (B) described below, (A) an organopolysiloxane which comprises from R3SiO1/2 units (wherein, each R represents, independently, an unsubstituted or substituted monovalent hydrocarbon group of 1 to 6 carbon atoms) and SiO4/2 units, in which a number of mols of said R3SiO1/2 units relative to 1 mol of said SiO4/2 units is from 0.6 to 1.2 mols, and which further comprises both R2SiO2/2 units and RSiO3/2 units (wherein in each formula, R is as defined above), and the quantities of both of the R2SiO2/2 units and RSiO3/2 units are each within a range from 0.2 to 0.8 mols relative to 1 mol of said SiO4/2 units, and moreover comprises less then 2.0% by weight of hydroxyl groups bonded to silicon atoms, (B) a diorganopolysiloxane with molecular chain terminals blocked with functional group-containing silyl groups; and
(II) from 0.1 to 30 parts by weight of a silane compound containing two or more hydrolysable groups bonded to silicon atoms within one molecule, and/or a partial hydrolysis-condensation product thereof.
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2. A room-temperature curable organopolysiloxane composition comprising:
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100 parts by weight of an organopolysiloxane that is condensation reaction product of 100 parts by weight of a component (A) described below, and from 1 to 200 parts by weight of a component (B) described below, (A) an organopolysiloxane which comprises from R3SiO1/2 units (wherein, each R represents, independently, an unsubstituted or substituted monovalent hydrocarbon group of 1 mol of said SiO4/2 units, in which a number of mols of said R3SiO1/2 units relative to 1 mol of said SiO4/2 units is from 0.6 to 1.2 mols, and which may further comprise from 0 to 1.0 mols of both R2SiO2/2 units and RSiO3/2 units (wherein in each formula, R is as defined above) relative to 1 mol of said SiO4/2 units, and moreover comprises less than 2.0% by weight of hydroxyl groups bonded to silicon atoms, (B) a diorganopolysiloxane with molecular chain terminals blocked with functional group-containing silyl groups;
(II) from 0.1 to 30 parts by weight of a silane compound containing two or more hydrolysable groups bonded to silicon atoms within one molecule, and/or a partial hydrolysis-condensation product thereof; and
(III) from 1 to 200 parts by weight of an organopolysiloxane containing from 3 to 50 mol % of phenyl group, and with molecular chain terminals blocked with trialkylsiloxy groups and/or functional group-containing silyl groups.
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3. A room-temperature curable organopolysiloxane composition comprising:
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(I) 100 parts by weight of an organopolysiloxane that is a condensation reaction product of 100 parts by weight of a component (A) described below, and from 1 to 200 parts by weight of a component (B) described below, (A) an organopolysiloxane which comprises from R3SiO1/2 units (wherein, each R represents, independently, an unsubstituted or substituted monovalent hydrocarbon group of 1 to 6 carbon atoms) and SiO4/2 units, in which a number of mols of said R3SiO1/2 units relative to 1 mol of said SiO4/2 units is from 0.6 to 1.2 mols, and which may further comprise from 0 to 1.0 mols of both R2SiO2/2 units and RSiO3/2 units (wherein in each formula, R is as defined above) relative to 1 mol of said SiO4/2 units, and moreover comprises less than 2.0% by weight of hydroxyl groups bonded to silicon atoms, (B) a diorganopolysiloxane with molecular chain terminals blocked with functional group-containing silyl groups;
(II) from 0.1 to 30 parts by weight of a silane compound containing two or more hydrolysable groups bonded to silicon atoms within one molecule, and/or a partial hydrolysis-condensation product thereof;
and(IV) from 1 to 200 parts by weight of an organopolysiloxane containing a group with a polyoxyalkylene structure, with molecular chain terminals blocked with trialkylsiloxy groups and/or functional group-containing silyl groups, and having an HLB value of 1 to 8.
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4. A liquid crystal display element produced using a sealant for a liquid crystal display element comprising a room-temperature curable organopolysiloxane composition comprising:
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100 parts by weight of an organopolysiloxane that is a condensation reaction product of 100 parts by weight of a component (A) described below, and from 1 to 200 parts by weight of a component (B) described below, (A) an organopolysiloxane which comprises from R3SiO1/2 units (wherein, each R represents, independently, an unsubstituted monovalent hydrocarbon group of 1 to 6 carbon atoms) and SiO4/2 units, in which a number of mols of said R3SiO1/2 units relative to 1 mol of said SiO4/2 units is from 0.6 to 1.2 mols, and which may further comprise from 0 to 1.0 mols of both R2SiO2/2 units and RSiO3/2 units (wherein in each formula, R is as defined above) relative to 1 mol of said SiO4/2 units, and moreover comprises less than 2.0% by weight of hydroxyl groups bonded to silicon atoms, (B) a diorganopolysiloxane with molecular chain terminals blocked with functional group-containing silyl groups; and
(II) from 0.1 to 30 parts by weight of silane compound containing two or more hydrolysable groups bonded to silicon atoms within one molecule, and/or a partial hydrolysis-condensation product thereof.
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Specification