Patent US5505997A successfully refreshed from Google Patents.
US5505997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for applying coatings of molten moisture curable organosiloxane compositions
Assignee: Dow Silicones Corp
•
Filing: 1994-04-29
•
Granted: 1996-04-09
•
Expires: 2014-04-29
Abstract
Abstract A stream of a molten moisture curable organosiloxane composition is entrained in a current of a heated gas containing a concentration of water vapor below the saturation level of the gas at 25° C. The gas current directs the organosiloxane composition toward the surface to be coated and provides an environment adjacent to the surface of the coated substrate that causes at least the surface layer of the composition to cure at a rate that is substantially constant and independent of the temperature and humidity in the macroscopic environment of the substrate.
Inventors
- 👤 Michael R. Strong
- 👤 Bernard VanWert
- 👤 Martin E. Cifuentes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:13
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; B; B05; B05C; B05C5/00; B05C5/02; B05D; B05D1/00; B05D1/26; B05D1/265; B05D3/00; B05D3/04; B05D3/0406; B05D3/042; B05C5/001
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
A method for coating a substrate with a molten moisture curable organosiloxane composition exhibiting a melting point of at least 30 degrees C., said method comprising the steps of 1) maintaining a supply of said composition in a reservoir at a temperature above the melting point of said composition, wherein said reservoir communicates with at least one nozzle; 2) extruding said composition through said nozzle, thereby producing a stream of said composition directed toward said substrate; 3) supplying a current of gas directed against said stream to control the direction and configuration of said stream, wherein the temperature of said gas current is maintained substantially constant and above 25° C., the relative humidity within said gas current is maintained substantially constant and within the range of from 5 to 95 percent, measured at 25° C., and said gas current creates an environment in the area between said nozzle and said substrate wherein at least the surface layer of said composition cures at a reproducible rate irrespective of the indigenous temperature and humidity in the area adjacent to said environment.
Claim 2
Independent Claim
179 words
A method for coating a substrate with a molten moisture curable organosiloxane composition exhibiting a melting point of at least 30 degrees C., said method comprising the steps of 1) maintaining a supply of said composition in a reservoir at a temperature above the melting point of said composition, wherein said reservoir communicates with at least one nozzle; 2) extruding said composition through said nozzle, thereby producing a stream of said composition directed toward said substrate; 3) supplying a current of gas directed against said stream to control the direction and configuration of said stream, wherein the temperature of said gas current is maintained substantially constant and above 25° C., the relative humidity within said gas current is maintained substantially constant and within the range of from 5 to 95 percent, measured at 25° C., and said gas current creates an environment in the area between said nozzle and said substrate wherein at least the surface layer of said composition cures at a reproducible rate irrespective of the indigenous temperature and humidity in the area adjacent to said environment.
Claim 3
Dependent Claim
54 words
A method according to claim 1 wherein the temperature of said gas current is from 30° to 150° C.; the relative humidity within said gas current is from 40 to 95 percent, measured at 25° C.; said gas is selected from the group consisting of air, oxygen, nitrogen, and mixtures of air and steam.
Claim 4
Dependent Claim
102 words
A method according to claim 1 wherein said curable composition comprises a moisture curable polyorganosiloxane that is a liquid at 25° C. and comprises repeating siloxane units, and an organosiloxane copolymer comprising units of the formulae R 1 3 SiO 1/2 and SiO 4/2 , wherein R 1 represents a substituted or unsubstituted monovalent hydrocarbon radical wherein any substituents do not react with other ingredients of said composition, said copolymer is a solid at 25° C. and exhibits a flow temperature of from 40° to 200° C., and said polyorganosiloxane contains a concentration of silicone-bonded hydrolyzable groups sufficient to cure said composition.
Claim 5
Dependent Claim
175 words
A method according to claim 3 wherein at least 50 percent of the siloxane units of said polyorganosiloxane are difunctional units of the formula R 2 R 3 SiO, up to about 20 percent are trifunctional units of the formula R 4 SiO 3/2 , and the terminal units exhibit the formula R 5 a Y 3-a SiG--, wherein R 2 is selected from the group consisting of R 1 and alkoxy groups, R 3 and R 4 are individually selected from the same group of hydrocarbon radicals as R 1 , R 5 is selected from the group consisting of aminoalkyl radicals and R 1 , G is selected from the group consisting of siloxane, siloxyalkylene and oxygen, Y is a hydrolyzable group, a is 0 or 1, the viscosity of said polyorganosiloxane is from 20 to 100 Pa.s at 25° C., and said copolymer constitutes from 40 to 80 percent of the combined weight of said moisture curable polyorganosiloxane and said copolymer, and said gas stream contains a curing catalyst for said composition.
Claim 6
Dependent Claim
69 words
A method according to claim 3 wherein R 1 is selected from the group consisting of methyl, phenyl and 3,3,3-trifluoropropyl, and said composition contains as a curing agent a silane of the formula R 6 n SiZ.sub.(4-n), where R 6 represents an alkyl or a phenyl radical and Z is a hydrolyzable group that reacts under ambient conditions with the hydrolyzable groups represented by Y on said curable polyorganosiloxane.
Claim 7
Dependent Claim
32 words
A method according to claim 5 wherein said gas is air, R 1 is methyl, R 2 is methyl, R 3 is methyl or phenyl, and Y is alkoxy, aminoalkoxy or ketoximo.
References Cited (Backward Citations)
US4132357A
Cited
US4106697A
Cited
GB2137638A
Cited
US4642158A
Cited
US4778642A
Cited
US4865920A
Cited
US4957783A
Cited
US4911956A
Cited
EP0363799A1
Cited
US4991772A
Cited
US4988779A
Cited
US4995333A
Cited
US5034061A
Cited
US5270425A
Cited
US5302671A
Cited
US5352491A
Cited
EP0628617B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |