Patent US5492981A successfully refreshed from Google Patents.
US5492981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting resin of epoxyalkylsiloxane, epoxy resin and anhyride
Assignee: Siemens AG
•
Filing: 1994-08-24
•
Granted: 1996-02-20
•
Expires: 2014-08-24
Abstract
Abstract A casting resin system containing epoxyalkylsiloxane is provided for covering optoelectronic components. The casting resin system includes a resin constituent containing a mixture of epoxyalkylsiloxanes and cycloaliphatic epoxy resins. The casting resin system can be hardened with a polycarboxylic acid anhydride as a hardener component to form molding materials that are transparent and color-stable.
Inventors
- 👤 Klaus Hoehn
- 👤 Ulrike Reeh
- 👤 Ernst Wipfelder
- 👤 Guenther Waitl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:19
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/24; C08L; C08L63/00; C08G59/32; C08G59/38; C08G59/40; C08G59/42; C08G59/4284; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/49; C08K5/51; C08K5/53; C08L83/00; C08L83/04; C08L83/06; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/852; H10H20/854
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A casting resin system containing epoxyalkylsiloxane comprising: a resin constituent including approximately 5% to 95% by weight of an epoxyalkylsiloxane and approximately 95% to 5% by weight of an epoxy resin, the epoxyalkylsiloxane is a condensation product of an epoxyalkoxysilane having a general formula (1) and a silanol having a general formula (2) reacted in ##STR4## wherein R1 is an alkyl radical having one to six carbon atoms or an aryl radical; R2 is a glycidyloxy alkyl, an epoxyalkyl or an epoxycycloalkyl radical; and R3 are independently selected from OR1, R2, an alkyl, or an aryl radical; R4 is an alkyl or an aryl; R5 are independently selected from OH or R4; and n is a whole number with 1≦n≦12; and a hardener constituent including at least one polycarboxylic acid anhydride.
Claim 2
Dependent Claim
131 words
A casting resin system containing epoxyalkylsiloxane comprising: a resin constituent including approximately 5% to 95% by weight of an epoxyalkylsiloxane and approximately 95% to 5% by weight of an epoxy resin, the epoxyalkylsiloxane is a condensation product of an epoxyalkoxysilane having a general formula (1) and a silanol having a general formula (2) reacted in ##STR4## wherein R1 is an alkyl radical having one to six carbon atoms or an aryl radical; R2 is a glycidyloxy alkyl, an epoxyalkyl or an epoxycycloalkyl radical; and R3 are independently selected from OR1, R2, an alkyl, or an aryl radical; R4 is an alkyl or an aryl; R5 are independently selected from OH or R4; and n is a whole number with 1≦n≦12; and a hardener constituent including at least one polycarboxylic acid anhydride.
Claim 3
Dependent Claim
30 words
The casting resin system of claim 1 wherein the polycarboxylic acid anhydride is selected from the group consisting of: aromatic and cycloaliphatic dicarboxylic acid anhydrides and aromatic tetracarboxylic acid anhydrides.
Claim 4
Dependent Claim
20 words
The casting resin system of claim 1 wherein the polycarboxylic acid anhydride is at least partially esterified with an alcohol.
References Cited (Backward Citations)
GB834326A
Cited
US3284398A
Cited
US3839280A
Cited
US4038338A
Cited
US4178274A
Cited
JPS6069131A
Cited
JPS60124617A
Cited
US4902739A
Cited
EP0567079A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |