Carbamate functional silica compounds and methods of making and use thereof
AssigneeBASF Coatings GmbH
InventorsGregory G. Menovcik, Walter H. Ohrbom
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Abstract
Disclosed is a carbamate functional silica, comprising repeating units: wherein R is H or an alkyl group of from 1 to 50 carbon atoms and n is a number from 1 to 100. Also disclosed is a functional silica comprising repeating units: wherein R is an alkyl group of from 1 to 50 carbon atoms, n is from 1 to 100, R1 and R2 may be the same or different and are at least one of a hydrocarbon group comprising from 1 to 100 carbon atoms with the proviso that at least one of R1 and R2 is not hydrogen. In one embodiment, R1 and R2 are hydrogen or the residual of an aminoplast polymer, an alkylating alcohol, or the like. Methods for making the disclosed functional silicas and coating compositions comprising the same are also provided.
Claims10
A carbamate functional silica, comprising repeating units of the structure:
- wherein R is H or a hydrocarbon of from 1 to 50 carbon atoms and n is a number from 2 to 100.
A method of making a carbamate functional silica, comprising
- providing a fumed silica having a plurality of silanol groups,
- reacting one or more of the silanol groups with at least one of (i) ammonia and hydrogencyanate;
- (ii) an alkyl carbamate in the presence of a tin catalyst;
- or (iii) phosgene and ammonia to provide a carbamate functional silica of the structure:
- wherein R is an alkyl group of from 1 to 50 carbon atoms and n is a number from 2 to 100.
A functional silica comprising repeating units of the structure:
- wherein R is H or a hydrocarbon group of from 1 to 50 carbon atoms, n is a number from 2 to 100, R1 and R2 may be the same or different and are at least one of a hydrocarbon group comprising from 1 to 100 carbon atoms with the provisos that at least one of R1 and R2 is not hydrogen and at least one of R1 and R2 comprises at least one functional group that is an ester, an ether, an amine group, a heterocyclic group, or a mixture thereof.
A functional silica comprising repeating units of at least one of structure (I) or (II):
- wherein R is H or a hydrocarbon of from 1 to 50 carbon atoms, n is a number from 2 to 100, and R′ is —(CH2)xCH3 wherein x is a number from 0 to 3.
Dependencies are inferred from the claim text.