Method for preparing functionalised polyorganosiloxane resins by redistribution in the presence of at least one triflic acid derivative
AssigneeBluestar Silicones France SAS
InventorsFernande Boisson, Gérard Mignani
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Abstract
The present invention relates to a process for preparing functionalized polyorganosiloxane (POS) resins comprising units M: (R3SiO1/2), Q: (SiO4/2) and M′: (YaR3-aSiO1/2) and optionally D: (R2SiO2/2) and/or D′: (RYSiO2/2) and T: (RSiO3/2) and/or T′: (YSiO3/2), with, in these units: R=C1-C10 alkyl or a C8-C12 aryl and Y a functional group (e.g.: Si—H), by redistribution of POS resins using POSf bearing functional units M′ and/or D′ and/or in the presence of an acid catalyst of the trifluoromethane-sulfonimide (TFSI) type. The present invention also relates to the aforementioned catalyst system.
Claims15
A process for preparing functionalized polyorganosiloxane (POS) resins comprising units M:
- (R3SiO1/2), Q:
- (SiO4/2) and M′:
- (YaR3-aSiO1/2) and optionally D:
- (R2SiO2/2) and/or D′:
- (RYSiO2/2) and T:
- (RSiO3/2) and/or T′:
- (YSiO3/2),
- wherein:
- the radicals R, which are identical or different, represent C1-C10 alkyl or C8-C12aryl;
- and
- the radicals Y, which are identical or different, represent a functional group Y selected from the group consisting of hydrogen, alkenyl, alkynyl, aryl, (alkyl)epoxy, ether, polyether, carboxylic acid, amide, amine, halide, alcohol, thiol and other sulfur derivative;
- said process comprising conducting a redistribution reaction between a POS resin and a POSf compound bearing functional units M′ and/or D′ and/or T′, as defined above, in the presence of an acid catalyst, wherein at least one catalyst has formula (I) below:
- (CmF2m+1SO2)nA (I)
- wherein:
- m is an integer greater than or equal to 1;
- and
- n is an integer equal to 1 or 2 and A represents NH2 or NH with:
- (i) n=1 and A=NH2 or NHR with R being a radical of SO2-Z type with Z being a group other than CmF2m+1;
- or
- (ii) n=2and A=NH;
- wherein the redistributed and functionalized resin obtained is subjected to at least one other redistribution/functionalization, using POSfs bearing functional units.
A process for preparing functionalized polyorganosiloxane (POS) resins comprising units M:
- (R3SiO1/2), Q:
- (SiO4/2) and M′:
- (YaR3-aSiO1/2) and optionally D:
- (R2SiO2/2) and/or D′:
- (RYSiO2/2) and T:
- (RSiO3/2) and/or T′:
- (YSiO3/2),
- wherein:
- the radicals R, which are identical or different, represent C1-C10 alkyl or C8-C12 aryl;
- and
- the radicals Y, which are identical or different, represent a functional group Y selected from the group consisting of hydrogen, alkenyl, alkynyl, aryl, (alkyl)epoxy, ether, polyether, carboxylic acid, amide, amine, halide, alcohol, thiol and other sulfur derivative;
- said process comprising conducting a redistribution reaction between a POS resin and a POSf compound bearing functional units M′ and/or D′ and/or T′, as defined above, in the presence of an acid catalyst, wherein at least one catalyst has formula (I) below:
- (CmF2m+1SO2)nA (I)
- wherein:
- m is an integer greater than or equal to 1;
- and
- n is an integer equal to 1 or 2 and A represents NH2 or NH with:
- (i) n=1 and A=NH2 or NHR with R being a radical of SO2-Z type with Z being a group other than CmF2m+1;
- or
- (ii) n=2 and A=NH;
- said process comprising the following essential steps:
- (1) combining the starting POS resin, the POSf bearing functional units and the acid catalyst (I) in an organic solvent;
- (2) reacting at a temperature θr greater than or equal to room temperature and less than or equal to the boiling point of the solvent;
- and
- (3) optionally quenching the reaction by adding an agent for neutralizing the acid catalyst (I);
- wherein the redistributed and functionalized resin obtained is subjected to at least one other redistribution/functionalization, using POSfs bearing functional units.
Dependencies are inferred from the claim text.