B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 23/42 (2006.01) B01J 37/02 (2006.01) C07C 255/41 (2006.01) C08G 77/08 (2006.01) C08L 83/04 (2006.01)
Patent
CA 2085804
The present invention provides microencapsulated hydrosilylation catalysts for one-part heat curable organo- siloxane compositions. Compositions containing these exhibit long-term storage stability yet cure rapidly when heated above the melting point of the encapsulating polymer. At least a portion of these microcapsules are less than one micron in diameter and substantially all are less than about three microns in diameter. Compositions containing the preferred platinum group metals as catalysts are optically transparent. The microencapsulated curing catalysts of this invention are prepared by irradiating with UV light in the wavelength range of from 300 to 400 nanometers a solution containing (1) at least one of a specified group of photo- crosslinkable organosiloxane compounds derived from propargyl esters of carboxylic acids containing a terminal aromatic hydrocarbon radical and at least two ethylenically unsaturated carbon atoms and (2) a liquid or solubilized hydrosilylation catalyst.
Evans Steven Mark
Lee Chi-Long
Yeh Ming-Hsiung
Dow Corning Corporation
Evans Steven Mark
Gowling Lafleur Henderson Llp
Lee Chi-Long
Yeh Ming-Hsiung
LandOfFree
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