Use of hydrophilic (co) polymers in crosslinkable aqueous silicone emulsions
OwnerJean-Paul Benayoun, Christian Mirou +2inventors
InventorsJean-Paul Benayoun, Christian Mirou, Charles Phan, Kenneth Wong
Life of this patent
Estimating the term…
Abstract
An aqueous crosslinkable silicone emulsion suitable for preparing a release coating on fibrous supports. The emulsion contains a polyorganosiloxane having Si-vinyl units and a polysiloxane having SiH units, crosslinkable by polyaddition in the presence of a platinum catalyst, together with at least one hydrophilic stabilizing (co)polymer having a molar mass greater or equal to 10,000 g/mol. The stabilizing (co)polymer improves the emulsion's coalescence stability under shear, improves the regularity and homogeneity of a coating of the emulsion on both surfaces of a paper support, and reduces the emulsion's tendency to foam.
Claims18
1-9. (canceled)
A method for improving the stability toward coalescence under shearing of aqueous silicone emulsions, comprising:
- forming an aqueous emulsion comprising silicone droplets, said silicone droplets comprising a crosslinkable silicone capable of forming an antiadhesive coating when applied to a flexible substrate, and
- adding at least one hydrophilic (co)polymer having a molar mass Mw≧1×105 g/mol to said aqueous silicone emulsion, before, during or after formation of the crosslinkable aqueous silicone emulsion.
Dependencies are inferred from the claim text.