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Patent US4287326A successfully refreshed from Google Patents.
US4287326A
Expired / Lapsed
US
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Siloxane-modified epoxy resin compositions
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1980-03-03
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Granted: 1981-09-01
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Expires: 2000-03-03
Abstract
Abstract Compositions containing siloxane-modified epoxy resins, epoxy, methacryl, or amino organofunctional alkoxysilicon compound and conventional epoxy curing agents are described which have improved resistance to degradation of both electrical properties and adhesion when exposed to moisture or boiling water. The compositions consist essentially of (A) siloxane-modified epoxy resin, (B) an organofunctional alkoxysilicon compound such as γ-aminopropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, or γ-glycidoxypropyltrimethoxysilane, and (C) curing agents such as carboxylic acid anhydrides.
Inventors
- 👤 Ryuzo Mikami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:29
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08G; C08G59/00; C08G59/02; C08K5/54; C08L; C08L63/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
A siloxane-modified epoxy resin composition consisting essentially of (A) 100 parts by weight of a siloxane-modified epoxy resin prepared by reacting (1) 5 to 70 parts by weight of an alkylphenylpolysiloxane of the general unit formula R.sub.a SiX.sub.b O(4-a-b/2) wherein each R is an alkyl or phenyl radical such that the ratio of alkyl radicals to phenyl radicals in the alkylphenylpolysiloxane is 0.3 to 3.0, X is an alkoxy radical or a hydroxyl radical, a is 0.9 to 1.8, and b is 0.01 to 2 with (2) 95 to 30 parts by weight of an epoxy resin having at least two epoxy groups per molecule, (B) 0.01 to 100 parts by weight of an organosilicon compound having attached to silicon an alkoxy radical and a monovalent organic radical containing a functional group selected from the group consisting of an epoxy group, a methacryl group and an amino group and (C) a curing agent for (A).
Claim 2
Dependent Claim
155 words
A siloxane-modified epoxy resin composition consisting essentially of (A) 100 parts by weight of a siloxane-modified epoxy resin prepared by reacting (1) 5 to 70 parts by weight of an alkylphenylpolysiloxane of the general unit formula R.sub.a SiX.sub.b O(4-a-b/2) wherein each R is an alkyl or phenyl radical such that the ratio of alkyl radicals to phenyl radicals in the alkylphenylpolysiloxane is 0.3 to 3.0, X is an alkoxy radical or a hydroxyl radical, a is 0.9 to 1.8, and b is 0.01 to 2 with (2) 95 to 30 parts by weight of an epoxy resin having at least two epoxy groups per molecule, (B) 0.01 to 100 parts by weight of an organosilicon compound having attached to silicon an alkoxy radical and a monovalent organic radical containing a functional group selected from the group consisting of an epoxy group, a methacryl group and an amino group and (C) a curing agent for (A).
Claim 3
Dependent Claim
39 words
A siloxane-modified epoxy resin composition according to claim 1 in which siloxane epoxy resin (A) is prepared by reacting 15 to 50 parts by weight (1) with 85 to 50 parts by weight (2) at 120° to 210° C.
Claim 4
Dependent Claim
23 words
A siloxane-modified epoxy resin composition according to claim 2 in which the epoxy resin (2) is a polydiglycidyl ether of bisphenol A resin.
Claim 5
Dependent Claim
22 words
A siloxane-modified epoxy resin composition according to claim 3 in which the epoxy resin has a molecular weight of 340 to 6000.
Claim 6
Dependent Claim
20 words
A siloxane-modified epoxy resin composition according to claim 4 containing 0.5 to 50 parts by weight of organosilicon compound (B).
Claim 7
Dependent Claim
78 words
A siloxane-modified epoxy resin composition according to claim 5 in which the organosilicon compound (B) has the general formula ##STR4## wherein Z is a monovalent organic radical containing a functional group selected from the group consisting of an epoxy group, a methacryl group and an amino group, Y is a lower alkoxy radical, R' is a hydrogen atom or a monovalent hydrocarbon radical, m and n are integers from 1 to 3 and m+n does not exceed 4.
Claim 8
Dependent Claim
27 words
A siloxane-modified epoxy resin composition according to claim 5 in which the organosilicon compound (B) is an organopolysiloxane with a degree of polymerization of 2 to 30.
Claim 9
Dependent Claim
28 words
A siloxane-modified epoxy resin composition according to claim 5 containing a curing agent (C) selected from the group consisting of polyhydric carboxylic acids and polyhydric carboxylic acid anhydrides.
Claim 10
Dependent Claim
18 words
A siloxane-modified epoxy resin composition according to claim 8 in which the curing agent (C) is trimellitic anhydride.
Claim 11
Dependent Claim
18 words
A siloxane-modified epoxy resin composition according to claim 8 in which the curing agent (C) is hexahydrophthalic anhydride.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |