Stock material or miscellaneous articles – Composite – Of silicon containing
Reexamination Certificate
2001-01-10
2003-05-13
Dawson, Robert (Department: 1712)
Stock material or miscellaneous articles
Composite
Of silicon containing
C428S447000, C428S450000, C428S457000, C428S689000, C428S352000, C427S387000, C427S391000, C427S407100, C427S411000, C427S421100, C427S428010, C106S287100
Reexamination Certificate
active
06562470
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to low temperature curable coatings, more particularly to addition curable organopolysiloxane coatings that cure rapidly at low temperature.
Addition curable release coating compositions and their use as release coatings are known, see, for example, coassigned U.S. Pat. No. 4,448,815. Alayer of such coating is typically applied to a substrate, such as paper, from a reactive coating bath which contains an alkenyl-functional organopolysiloxane, a hydride-functional organopolysiloxane, an organoplatinum complex and a cure inhibitor. Once applied, the layer of coating is cured by exposing the coated substrate to elevated temperature.
The cure inhibitor retards cure of the coating and enables a balance between a long useful coating bath life at low temperature and rapid cure speed at elevated temperature to be maintained. There is a constant desire in the art to provide increased cure speed without compromising bath life.
The need to subject the coated substrate to elevated temperature to cure the coating layer introduces some drawbacks to the use of the process for addition cure organopolysiloxane release coatings. These drawbacks are in the form of energy costs, a need to rehydrate coated paper substrates after curing and a limited ability to use such coatings to coat temperature sensitive substrates, such as, for example, some polymer films. Due to these drawbacks, there is a desire in the art to provide coatings that are curable at lower temperature without compromising bath life.
BRIEF SUMMARY OF THE INVENTION
The present invention provides a method of making a coated substrate comprising:
applying a coating composition to a substrate, wherein the coating composition comprises an alkenyl functional compound and a hydride functional compound, and the substrate comprises a catalytically effective amount of a platinum group metal catalyst having the formula Z
x
Pt(0)L
y
wherein L comprises an electron-withdrawing ester ligand, a quinone-based ligand, or combination thereof, y is in a range between about 1 and about 4, Z comprises a coordinating ligand, x is in a range between 0 and about 3, and x+y is in a range between about 2 and about 4; and
allowing the coating composition to cure.
The present invention further provides a system for making a coated substrate comprising a coating composition, said coating composition comprising an alkenyl functional compound and a hydride functional compound, and a substrate having a platinum group metal catalyst having the formula Z
x
Pt(0)L
y
wherein the catalyst is disposed on at least one surface of the substrate in an amount effective to catalyze cure of the coating composition when the coating composition is applied to the substrate.
The present invention further provides a catalyzed article comprising a substrate comprising papers, polymer films, polymer coated papers, metal foils, or combinations thereof, and a platinum group metal catalyst having the formula Z
x
Pt(0)L
y
disposed on at least one surface of the substrate.
REFERENCES:
patent: 5529822 (1996-06-01), Togashi et al.
patent: 5977280 (1999-11-01), Kadlec et al.
patent: 6077611 (2000-06-01), Griswold et al.
patent: 9525734 (1995-09-01), None
“Efficient Homogeneous Hydrosilylation of Olefins by Use of Complexes of PT With Selected Electron-Defocoemt P;efoms as :ogamds”, P. Steffanut, J.A. Osborn, A. DeCian & J. Fisher, Chem. Eur. J. 1998, 4. No. 10, pp. 2008-2017.
Leman John Thomas
Shaffer Kathryn Ann
Stein Judith
Bennett Bernadette M.
Dawson Robert
Feely Michael J
General Electric Company
Johnson Noreen C.
LandOfFree
Method for making coated substrates and articles made thereby does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for making coated substrates and articles made thereby, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for making coated substrates and articles made thereby will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3006880