US4640939A
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Organopolysiloxane compositions for antiadhesive/release coatings
Assignee: Rhone Poulenc Specialites Chimiques
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Filing: 1985-10-15
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Granted: 1987-02-03
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Expires: 2005-10-15
Abstract
Abstract Gelation-resistant, high pot life organopolysiloxane compositions adapted for antiadhesive/release coating applications, are comprised of (1) at least one substantially straight-chain organopolysiloxane having a viscosity ranging from about 50 to 100,000 mPa.s at 25 DEG C. and containing at least x alkenyl unsaturated hydrocarbon groups bonded to a silicon atom, per molecule, wherein x>/=2, (2) at least one organohydropolysiloxane crosslinking agent having a viscosity ranging from about 10 to 100,000 mPa.s at 25 DEG C. and containing at least y hydrogen atoms bonded to silicon atoms, per molecule, wherein y>/=2, (3) a catalytically effective amount of a platinum group metal crosslinking catalyst, and (4) an effective amount of at least one azodicarboxylate gelation inhibitor which is inert to the activity of said catalyst (3), but in insufficient amount as to prevent the crosslinking of said polysiloxanes (1) and (2) under crosslinking conditions.
Inventors
- 👤 Jacques Cavezzan
- 👤 Gerard Soula
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:52
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/23; C08K5/235; C08K5/56; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08G77/22; C08G77/24; C08G77/42; C08G77/44; C08G77/70; Y; Y10; Y10S; Y10S522/00; Y10S522/904; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
140 words
A curable organopolysiloxane composition of matter, comprising (1) at least one substantially straight-chain organopolysiloxane having a viscosity ranging from about 50 to 100,000 mPa.s at 25° C. and containing at least x alkenyl unsaturated hydrocarbon groups bonded to a silicon atom, per molecule, wherein x≧2, (2) at least one organohydropolysiloxane crosslinking agent having a viscosity ranging from about 10 to 100,000 mPa.s at 25° C. and containing at least y hydrogen atoms bonded to silicon atoms, per molecule, wherein y≧2, (3) a catalytically effective amount of a platinum group metal crosslinking catalyst, and (4) an effective amount of at least one azodicarboxylate gelation inhibitor which is inert to the activity of said catalyst (3) and which inhibits gel formation at ambient temperatures, but in insufficient amount as to prevent the crosslinking of said polysiloxanes (1) and (2) under cross-linking conditions.
Claim 2
Dependent Claim
140 words
A curable organopolysiloxane composition of matter, comprising (1) at least one substantially straight-chain organopolysiloxane having a viscosity ranging from about 50 to 100,000 mPa.s at 25° C. and containing at least x alkenyl unsaturated hydrocarbon groups bonded to a silicon atom, per molecule, wherein x≧2, (2) at least one organohydropolysiloxane crosslinking agent having a viscosity ranging from about 10 to 100,000 mPa.s at 25° C. and containing at least y hydrogen atoms bonded to silicon atoms, per molecule, wherein y≧2, (3) a catalytically effective amount of a platinum group metal crosslinking catalyst, and (4) an effective amount of at least one azodicarboxylate gelation inhibitor which is inert to the activity of said catalyst (3) and which inhibits gel formation at ambient temperatures, but in insufficient amount as to prevent the crosslinking of said polysiloxanes (1) and (2) under cross-linking conditions.
Claim 3
Dependent Claim
10 words
The organopolysiloxane composition as defined by claim 1, wherein x+y≧5.
Claim 4
Dependent Claim
77 words
The organopolysiloxane composition as defined by claim 2, wherein said azodicarboxylate (4) has the general formula: R.sub.1 OCC--N═N--COOR.sub.2 (I) or R'.sub.1 OOC--N═N--COO--R--OOC--N═N--COOR'.sub.2 (II) in which R 1 , R 2 , R' 1 and R' 2 , which may be identical or different, are each a straight or branched chain alkyl radical having from 1 to 12 carbon atoms, and R is an alkylene radical, --CH 2 ) n , wherein n ranges from 1 to 12.
Claim 5
Dependent Claim
17 words
The organopolysiloxane composition as defined by claim 3, wherein said azodicarboxylate (4) has the general formula (I).
Claim 6
Dependent Claim
17 words
The organopolysiloxane composition as defined by claim 3, wherein said azodicarboxylate (4) has the general formula (II).
Claim 7
Dependent Claim
17 words
The organopolysiloxane composition as defined by claim 4, wherein said azodicarboxylate (4) comprises methyl or ethyl azodicarboxylate.
Claim 8
Dependent Claim
33 words
The organopolysiloxane composition as defined by claim 3, said organopolysiloxane (1) containing essentially only methyl and vinyl groups per molecule, and said organohydropolysiloxane (2) containing essentially only methyl and .tbd.SiH groups per molecule.
Claim 9
Dependent Claim
20 words
The organopolysiloxane composition as defined by claim 3, said azodicarboxylate (4) having a boiling point of at least 25° C.
Claim 10
Dependent Claim
41 words
The organopolysiloxane composition as defined by claim 3, comprising, per 100 parts by weight of said organopolysiloxane (1), about 0.1 to 50 parts by weight of said organohydropolysiloxane (2), and about 0.01 to 3 parts by weight of said azodicarboxylate (4).
Claim 11
Dependent Claim
19 words
The organopolysiloxane composition as defined by claim 9, comprising from about 5 to 1,000 ppm of said catalyst (3).
Claim 12
Dependent Claim
19 words
The organopolysiloxane composition as defined by claim 2, dispersed in or diluted with a volatile organic solvent compatible therewith.
Claim 13
Dependent Claim
19 words
The organopolysiloxane composition as defined by claim 11, said solvent comprising from about 50 to 99% by weight thereof.
Claim 14
Dependent Claim
18 words
The organopolysiloxane composition as defined by claim 2, having a viscosity not exceeding 5,000 mPa.s at 25° C.
Claim 15
Dependent Claim
16 words
A shaped substrate coated with a layer of the organopolysiloxane composition as defined by claim 1.
Claim 16
Dependent Claim
19 words
The shaped substrate as defined by claim 14, the same comprising a metal, wood, glass, paper, or plastic substrate.
Claim 17
Dependent Claim
18 words
The shaped substrate as defined by claim 15, coated with a thin peelable layer of said organopolysiloxane composition.
Claim 18
Dependent Claim
18 words
A process for forming an organopolysiloxane coating composition comprising crosslinking the composition of claim 1 with ultraviolet radiation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |