Method for preparing poly(hydroxymethyl)-functional siloxanes and silica gels
First Claim
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1. A method for preparing poly(hydroxymethyl)-functional siloxanes of the formula I
(SiO4/2)k(R1SiO3/2)m(R12SiO2/2)p(R13SiO1/2)q(O1/2H)t[(O1/2)2+ySiR21−
- y—
CH2—
OH]s
Formula I,comprising reacting cyclic compounds having at least one unit of the formula II
[SiR2(OR3)—
CH2—
O]n
Formula IIwith water, wherein optionally one or more hydrolyzable compounds of the formula III
R13−
zSiY1+z
Formula IIImay be present, whereinR1 is hydrogen, a cyclic or acyclic, linear or branched, aromatic, aliphatic or olefinic, saturated or unsaturated C1-C20 hydrocarbon residue, a C1-C20 hydrocarbonoxy residue, or a C4-C40 polyether residue, each optionally substituted with Q1, optionally interrupted by one or more groups Q2 or comprising one or more groups Q2,R2 is hydroxyl or a cyclic or acyclic, linear or branched, aromatic, aliphatic or olefinic, saturated or unsaturated C1-C20 hydrocarbon residue, C1-C20 hydrocarbonoxy residue, C4-C40 polyether residue, or Si1-Si20 siloxanoxy residue, each optionally substituted with Q1, optionally interrupted by one or more groups Q2 or comprising one or more groups Q2,R3 is hydrogen or a cyclic or acyclic, linear or branched, aromatic, aliphatic, olefinic, saturated or unsaturated C1-C20 hydrocarbon residue, a C4-C40 polyether residue, or a Si1-Si20 siloxanyl residue, each optionally substituted with Q1, optionally interrupted by one or more groups Q2 or comprising one or more groups Q2,Q1 is a heteroatom-containing monovalent residue,Q2 is a heteroatom-containing divalent residue or a heteroatom-containing trivalent residue,Y is a hydrolyzable group attached to silicon via a heteroatom,k, m, p, q and t are greater than or equal to zero,s and n are greater than zero,y is 0 or 1, andz is 0, 1, 2 or 3.
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Abstract
Hydroxymethyl-functional siloxanes and silica gels are prepared by reacting a siloxacycle having at least one unit of the formula [SiR2(OR3)—CH2—O]n with water, optionally in the presence of a hydrolyzable silane.
18 Citations
13 Claims
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1. A method for preparing poly(hydroxymethyl)-functional siloxanes of the formula I
(SiO4/2)k(R1SiO3/2)m(R12SiO2/2)p(R13SiO1/2)q(O1/2H)t[(O1/2)2+ySiR21−- y—
CH2—
OH]s
Formula I,comprising reacting cyclic compounds having at least one unit of the formula II
[SiR2(OR3)—
CH2—
O]n
Formula IIwith water, wherein optionally one or more hydrolyzable compounds of the formula III
R13−
zSiY1+z
Formula IIImay be present, wherein R1 is hydrogen, a cyclic or acyclic, linear or branched, aromatic, aliphatic or olefinic, saturated or unsaturated C1-C20 hydrocarbon residue, a C1-C20 hydrocarbonoxy residue, or a C4-C40 polyether residue, each optionally substituted with Q1, optionally interrupted by one or more groups Q2 or comprising one or more groups Q2, R2 is hydroxyl or a cyclic or acyclic, linear or branched, aromatic, aliphatic or olefinic, saturated or unsaturated C1-C20 hydrocarbon residue, C1-C20 hydrocarbonoxy residue, C4-C40 polyether residue, or Si1-Si20 siloxanoxy residue, each optionally substituted with Q1, optionally interrupted by one or more groups Q2 or comprising one or more groups Q2, R3 is hydrogen or a cyclic or acyclic, linear or branched, aromatic, aliphatic, olefinic, saturated or unsaturated C1-C20 hydrocarbon residue, a C4-C40 polyether residue, or a Si1-Si20 siloxanyl residue, each optionally substituted with Q1, optionally interrupted by one or more groups Q2 or comprising one or more groups Q2, Q1 is a heteroatom-containing monovalent residue, Q2 is a heteroatom-containing divalent residue or a heteroatom-containing trivalent residue, Y is a hydrolyzable group attached to silicon via a heteroatom, k, m, p, q and t are greater than or equal to zero, s and n are greater than zero, y is 0 or 1, and z is 0, 1, 2 or 3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification
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Current AssigneeWacker Chemie AG (Dr. Alexander Wacker Familiengesellschaft Mit Beschrã¤Nkter Haftung)
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Original AssigneeWacker Chemie AG (Dr. Alexander Wacker Familiengesellschaft Mit Beschrã¤Nkter Haftung)
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InventorsHoffmann, Florian, Erhardt, Sascha Andre, Rieger, Bernhard, Stohrer, Juergen
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Primary Examiner(s)Katakam, Sudhakar
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Assistant Examiner(s)Bakshi, Pancham
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Application NumberUS14/238,510Publication NumberTime in Patent Office1,112 DaysField of Search528/10, 528/37US Class Current1/1CPC Class CodesC07F 7/1804 Compounds having Si-O-C lin...C07F 7/1872 Preparation; Treatments not...C08G 77/10 Equilibration processesC08G 77/14 containing silicon bound to...
