US2006058483A1PendingUtilityA1

Process for producing polysiloxanes and use of the same

42
Assignee: ZHA CONGJIPriority: Dec 2, 2002Filed: Dec 1, 2003Published: Mar 16, 2006
Est. expiryDec 2, 2022(expired)· nominal 20-yr term from priority
Inventors:Congji ZhaDax Kukulj
C08G 77/56C08G 77/24C08G 77/08C08G 77/58C08G 77/28C08K 3/32C08G 77/20
42
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Claims

Abstract

A process for the preparation of an organosilicon condensate which comprises reacting together (A) at least one silicon containing compound having at least one silanol group; and (B) at least one silicon containing compound having at least one —OR group in the presence of (C) a calcium or magnesium catalyst selected to allow the reaction to proceed and (D) at least one solvent. Advantageous catalysts include calcium hydroxide, calcium oxide, magnesium hydroxide or magnesium oxide. Advantageously the solvent may be a protic solvent such as water, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-butanol. The invention also relates to condensates, such as siloxanes, prepared by the process.

Claims

exact text as granted — not AI-modified
1 - 55 . (canceled)  
   
   
       56 . A process for the preparation of an organosilicon condensate which comprises reacting together: 
 (A) at least one silicon containing compound having at least one silanol group; and    (B) at least one silicon containing compound having at least one —OR group    wherein R represents an alkyl group having from 1 to 8 carbon atoms, or an alkoxyalkyl group having from 2 to 8 carbon atoms in the presence of    (C) a calcium or magnesium catalyst selected to allow the reaction to proceed and    (D) at least one protic solvent; and    wherein the at least one silicon compound having at least one silanol group and the at least one silicon containing compound having at least one —OR group are in a molar ratio ranging from 1:2 to 2:1.    
   
   
       57 . A process according to  claim 56  wherein the at least one silicon containing compound having at least one silanol group and the at least one silicon containing compound having at least one —OR group are in a 1:1 molar ratio.  
   
   
       58 . A process according to  claim 56  wherein the organosilicon condensate is a siloxane.  
   
   
       59 . A process according to  claim 58  wherein the siloxane is a polysiloxane.  
   
   
       60 . A process according to  claim 56  wherein the at least one silicon containing compound having at least one silanol group is a silanol.  
   
   
       61 . A process according to  claim 60  wherein the silanol has between one and three unsubstituted or substituted hydrocarbon groups having from 1 to 18 carbon atoms.  
   
   
       62 . A process according to  claim 60  wherein the silanol has one OH group.  
   
   
       63 . A process according to  claim 60  wherein the silanol has two OH groups.  
   
   
       64 . A process according to  claim 60  wherein the silanol has three OH groups.  
   
   
       65 . A process according to  claim 60  wherein the silanol has four OH groups.  
   
   
       66 . A process according to  claim 60  wherein the silanol is diphenyl silanediol.  
   
   
       67 . A process according to  claim 60  wherein the silanol bears a crosslinkable group.  
   
   
       68 . A process according to  claim 67  wherein the crosslinkable group is a double bond.  
   
   
       69 . A process according to  claim 68  wherein the double bond is a carbon-carbon double bond.  
   
   
       70 . A process according to  claim 69  wherein the double bond is selected from an acrylate double bond, a methacrylate double bond and a styrene double bond.  
   
   
       71 . A process according to  claim 67  wherein the crosslinkable group is an epoxide.  
   
   
       72 . A process according to  claim 56  wherein the at least one silicon containing compound having at least one —OR group is a compound with the general formula  
       G y Si(OR) 4-y    wherein y has a value of 0, 1, 2 or 3,    G represents a unsubstituted or substituted hydrocarbon group having from 1 to 18 carbon atoms; and    R represents an alkyl group having from 1 to 8 carbon atoms or an alkoxyalkyl group having from 2 to 8 carbon atoms.    
   
   
       73 . A process according to  claim 72  wherein the at least one silicon containing compound having at least one —OR group is an alkoxy silane.  
   
   
       74 . A process according to  claim 73  wherein the alkoxy silane has one alkoxy group.  
   
   
       75 . A process according to  claim 73  wherein the alkoxy silane has two alkoxy groups.  
   
   
       76 . A process according to  claim 73  wherein the alkoxy silane has three alkoxy groups.  
   
   
       77 . A process according to  claim 73  wherein the alkoxy silane has four alkoxy groups.  
   
   
       78 . A process according to  claim 72  wherein (OR) is selected from the group consisting of methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, t-butoxy.  
   
   
       79 . A process according to  claim 73  wherein the alkoxy silane bears a crosslinkable group.  
   
   
       80 . A process according to  claim 79  wherein the alkoxy silane bears a crosslinkable group on G.  
   
   
       81 . A process according to  claim 79  wherein the crosslinkable group is a double bond.  
   
   
       82 . A process according to  claim 81  wherein the double bond is a carbon-carbon double bond.  
   
   
       83 . A process according to  claim 81  wherein the crosslinkable group is a double bond selected from an acrylate double bond, a methacrylate double bond and a styrene double bond.  
   
   
       84 . A process according to  claim 79  wherein the crosslinkable group is an epoxide.  
   
   
       85 . A process according to  claim 73  wherein the alkoxy silane is a compound selected from the group consisting of 3-methacryloxypropyltrimethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane, octyltrimethoxysilane, 3-styrylpropyltrimethoxysilane, and 3-glycidoxypropyltrimethoxysilane, or a mixture thereof.  
   
   
       86 . A process according to  claim 56  wherein the calcium or magnesium catalyst is not calcium carbonate, calcium phosphate, or magnesium carbonate.  
   
   
       87 . A process according to  claim 86  wherein the calcium or magnesium catalyst is calcium hydroxide, calcium oxide, magnesium hydroxide or magnesium oxide.  
   
   
       88 . A process according to  claim 87  wherein the calcium or magnesium catalyst is calcium hydroxide.  
   
   
       89 . A process according to  claim 87  wherein the calcium or magnesium catalyst is calcium oxide.  
   
   
       90 . A process according to  claim 87  wherein the calcium or magnesium catalyst is magnesium hydroxide.  
   
   
       91 . A process according to  claim 87  wherein the calcium or magnesium catalyst is magnesium oxide.  
   
   
       92 . A process according to  claim 56  wherein the protic solvent is an alcohol.  
   
   
       93 . A process according to  claim 92  wherein the protic solvent is selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-butanol.  
   
   
       94 . A process according to  claim 56  wherein the protic solvent is water.  
   
   
       95 . A process according to  claim 56  wherein the calcium or magnesium catalyst is separated from the organosilicon condensate.  
   
   
       96 . A process according to  claim 56  wherein the catalyst is employed in an amount of from 0.0005 to 5% by mole based on the total silicon containing compounds.  
   
   
       97 . A process as claimed in  claim 96  wherein the catalyst is employed in an amount of from 0.01 to 0.5% by mole based on the total silicon containing compounds.  
   
   
       98 . A process according to  claim 56  wherein the protic solvent is employed in an amount of from 0.02% to 200% by mole based on the total silicon containing compounds.  
   
   
       99 . A process according to  claim 98  wherein the protic solvent is employed in an amount of from 0.2% to 100% by mole based on the total silicon containing compounds.  
   
   
       100 . A process according to  claim 99  wherein the solvent is employed in an amount of 0.4 to 50% by mole based on the total silicon containing compounds.  
   
   
       101 . A process according to  claim 100  wherein the solvent is water employed in an amount of less than 8% by mole based on the total silicon containing compounds.  
   
   
       102 . A process according to  claim 101  wherein the solvent is water employed in an amount of less than 4% by mole based on the total silicon containing compounds.  
   
   
       103 . A process according to  claim 56  carried out at a temperature in the range from 40° C. to 150° C.  
   
   
       104 . A process according to  claim 103  carried out at a temperature in the range from 50° C. to 100° C.  
   
   
       105 . A process according to  claim 104  carried out at about 80° C.  
   
   
       106 . A polysiloxane prepared by the method of  claim 56  having an absorption of less than 15 cm −1  at about 2820 nm.  
   
   
       107 . A polysiloxane according to  claim 106  having an absorption of less than 7 cm −1  at about 2820 nm.

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