US4960863A
Expired / Lapsed
US
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Polycarbonate cross-linked resin
Assignee: General Electric Co
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Filing: 1989-09-28
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Granted: 1990-10-02
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Expires: 2009-09-28
Abstract
Abstract Polycarbonate resins containing at least one divalent chain unit of the formula: ##STR1## wherein E represents a trivalent hydrocarbon radical, or a trivalent halogen-substituted hydrocarbon radical, are transitory cross-linkers prepared by thermal degradation of the corresponding acid esters (the ester group being removable under conditions of the degradation by a beta-elimination mechanism). Cross-linked polycarbonate resins exhibit enhanced fire-resistance, especially non-dripping. The cross-linkers are useful to cross-link any resin having a group reactive with a carboxyl group.
Inventors
- 👤 Niles R. Rosenquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:40
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/10; C08G63/00; C08G63/64; C08G64/14; C08G69/00; C08G69/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A cross-linked polycarbonate resin composition prepared by a process which comprises the thermolytic degradation of the polycarbonate resin containing at least one chain moiety of the formula: ##STR11## wherein E is selected from the group consisting of a trivalent hydrocarbon radical containing from 1 to 15 carbon atoms, inclusive, and a halogen-substituted hydrocarbon radical containing from 1 to 15 carbon atoms, inclusive,; and R is selected from the group consisting of hydrocarbyl and halogen-substituted hydrocarbyl amenable to beta-elimination upon thermal degradation.
Claim 2
Dependent Claim
81 words
A cross-linked polycarbonate resin composition prepared by a process which comprises the thermolytic degradation of the polycarbonate resin containing at least one chain moiety of the formula: ##STR11## wherein E is selected from the group consisting of a trivalent hydrocarbon radical containing from 1 to 15 carbon atoms, inclusive, and a halogen-substituted hydrocarbon radical containing from 1 to 15 carbon atoms, inclusive,; and R is selected from the group consisting of hydrocarbyl and halogen-substituted hydrocarbyl amenable to beta-elimination upon thermal degradation.
Claim 3
Dependent Claim
9 words
The composition of claim I wherein E represents ##STR12##
Claim 4
Dependent Claim
11 words
The composition of claim 2 wherein R is alkyl or cycloalkyl.
Claim 5
Dependent Claim
9 words
The composition of claim 3 wherein R is ethyl.
Claim 6
Dependent Claim
9 words
The composition of claim 3 wherein R is isopropyl.
Claim 7
Dependent Claim
9 words
The composition of claim 3 wherein R is 1-ethylpropyl.
Claim 8
Dependent Claim
9 words
An article molded from the resin of claim 1.
References Cited (Backward Citations)
US3291774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |