US3928629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating process
Assignee: Dow Silicones UK Ltd
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Filing: 1974-06-14
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Granted: 1975-12-23
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Expires: 1994-06-14
Abstract
Abstract Process for coating a surface with an organosiloxane composition to render it non-adherent. The organosiloxane composition is substantially solvent-free, has a viscosity not exceeding 4000 cS at 25*C and comprises (1) a polydiorganosiloxane having siliconbonded vinyl radicals (2) an organohydrogenpolysiloxane and (3) a catalyst which is RhX3(SR2)3 or Rh2(CO)4X2 in which X is halogen, preferably chlorine, and each R is alkyl, aryl, aralkyl, alkaryl or R''3SiQ wherein Q is a divalent aliphatic hydrocarbon radical and R'' is alkyl, aryl, aralkyl or alkaryl or (CH3)3Si-. After application the composition is cured.
Inventors
- 👤 Grish Chandra
- 👤 Colin Mostyn Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:33
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08; C08G77/12; C08G77/20; C08G77/42; C08G77/44; C08G77/70
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
A PROCESS FOR COATING A SURFACE WHICH COMPRISES APPLYING THERETO A COMPOSITION HAVING A VISCOSITY NOT EXCEEDING 4000 CS AT 25*C AND COMPRISING (1) A POLYDIORGANOSILOXANE HAVING A VISCOSITY IN THE RANGE FROM 50 TO 4000 CS AT 25*C WHEREIN FROM 0.1 TO 15 PER CENT OF THE TOTAL SILICON-BONDED RADICALS ARE VINYL RADICALS, THERE BEING AT LEAST TWO VINYL RADICALS PER MOLECULE AND AT LEAST 80 PER CENT OF THE REMAINING SILICON-BONDED RADICALS BEING METHYL RADICALS, (2) AN ORGANOHYDROGENPOLYSILOXANE HAVING THEREIN SILICON-BONDED HYDROGEN ATOMS AND SILICON-BONDED ORGANIC RADICALS SELECTED FROM METHYL, ETHYL AND PHENYL RADICALS, THERE BEING IN THE MOLECULE ON AVERAGE AT LEAST THREE SILICON-BONDED HYDROGEN ATOMS AND NO MORE THAN 20 MOLAR PER CENT OF COPOLYMERIC DIORGANOSILOXANE UNITS, AND (3) A CATALYST FOR THE ADDITION OF SIH GROUPS TO SILICON-BONDED VINYL GROUPS, SAID CATALYST COMPRISING ONE OR MORE COMPLEXES OF RHODIUM HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
148 words
A PROCESS FOR COATING A SURFACE WHICH COMPRISES APPLYING THERETO A COMPOSITION HAVING A VISCOSITY NOT EXCEEDING 4000 CS AT 25*C AND COMPRISING (1) A POLYDIORGANOSILOXANE HAVING A VISCOSITY IN THE RANGE FROM 50 TO 4000 CS AT 25*C WHEREIN FROM 0.1 TO 15 PER CENT OF THE TOTAL SILICON-BONDED RADICALS ARE VINYL RADICALS, THERE BEING AT LEAST TWO VINYL RADICALS PER MOLECULE AND AT LEAST 80 PER CENT OF THE REMAINING SILICON-BONDED RADICALS BEING METHYL RADICALS, (2) AN ORGANOHYDROGENPOLYSILOXANE HAVING THEREIN SILICON-BONDED HYDROGEN ATOMS AND SILICON-BONDED ORGANIC RADICALS SELECTED FROM METHYL, ETHYL AND PHENYL RADICALS, THERE BEING IN THE MOLECULE ON AVERAGE AT LEAST THREE SILICON-BONDED HYDROGEN ATOMS AND NO MORE THAN 20 MOLAR PER CENT OF COPOLYMERIC DIORGANOSILOXANE UNITS, AND (3) A CATALYST FOR THE ADDITION OF SIH GROUPS TO SILICON-BONDED VINYL GROUPS, SAID CATALYST COMPRISING ONE OR MORE COMPLEXES OF RHODIUM HAVING THE GENERAL FORMULA
Claim 3
Dependent Claim
32 words
A process as claimed in claim 1 in which the polydiorganosiloxane (1) is a copolymer comprising methylvinylsiloxane units and dimethylsiloxane units any end-stopping units present being selected from trimethylsiloxane or dimethylvinylsiloxane units.
Claim 4
Dependent Claim
28 words
A process as claimed in claim 2 in which the vinyl radicals constitute from 0.1 to 5 per cent of the total organic radicals in the polydiorganosiloxane (1).
Claim 5
Dependent Claim
29 words
a process as claimed in claim 1 in which the organohydrogenpolysiloxane (2) is a trimethylsiloxy end-stopped methylhydrogenpolysiloxane having an average molecular weight in the range from 1200 to 3,500.
Claim 6
Dependent Claim
46 words
A process as claimed in claim 1 in which the catalyst (3) is a complex having the general formula RhX3(SR2)3 wherein each X represents a chlorine atom and each R represents an alkyl radical having from 1 to 4 inclusive carbon atoms or the -CH2Si(CH3)3 group.
Claim 7
Dependent Claim
34 words
A process as claimed in claim 1 in which the ratio of silicon-bonded hydrogen atoms provided by (2) to silicon-bonded vinyl radicals provided by (1) is from 1 : 1 to 3 : 1.
Claim 8
Dependent Claim
23 words
a process as claimed in claim 1 in which the applied composition has a viscosity of from 100 to 500 cS at 25*C.
Claim 9
Dependent Claim
17 words
A process as claimed in claim 1 in which the surface to be coated is of paper.
References Cited (Backward Citations)
US3546266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |