EP0351025A2
Expired / Lapsed
EP
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Fiber reinforced composites toughened with carboxylated rubber particles
Assignee: BP Corp North America Inc
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Filing: 1989-07-14
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Granted: —
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Expires: 2009-07-14
Abstract
Abstract Fiber reinforced composite structures based on epoxy resin formulations having a phase-separated or multiphase morphology when cured are effectively toughened by adding preformed carboxylated rubber particles to the matrix resin prior to curing the composite.
Inventors
- 👤 Daniel H. Hecht
- 👤 Hugh C. Gardner
- 👤 Shahid P. Qureshi
- 👤 Peter W. Manders
- 👤 Richard H. Newman-Evans
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 04:55
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08L; C08L63/00; C08J2363/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A curable matrix resin formulation comprising (a) from 99 to 75 wt% of a mixture of 100 pbw of an epoxy resin, from 10 to 200 pbw of a terminally reactive aromatic oligomer and from 60 to 150 pbw of a diamine hardener, characterized in that it further contains (b) from 1 to 25 wt% of cross-linked carboxylated rubber particles having a Tg above 15°C and a smallest dimension in the range of from 1 to 75 microns, said particles formed of a carboxylated rubber having from 0.1 to 5 wt% carboxyl functionality selected from the group consisting of carboxylated diene rubbers, carboxylated acrylic rubbers, and mixtures thereof.
Claim 2
Dependent Claim
108 words
A curable matrix resin formulation comprising (a) from 99 to 75 wt% of a mixture of 100 pbw of an epoxy resin, from 10 to 200 pbw of a terminally reactive aromatic oligomer and from 60 to 150 pbw of a diamine hardener, characterized in that it further contains (b) from 1 to 25 wt% of cross-linked carboxylated rubber particles having a Tg above 15°C and a smallest dimension in the range of from 1 to 75 microns, said particles formed of a carboxylated rubber having from 0.1 to 5 wt% carboxyl functionality selected from the group consisting of carboxylated diene rubbers, carboxylated acrylic rubbers, and mixtures thereof.
Claim 3
Dependent Claim
34 words
The curable matrix resin formulation of claim 1, characterized in that said carboxylated rubber is a carboxylated nitrile rubber having a Tg above 15°C and a carboxyl content of from 1 to 4 wt%.
Claim 4
Dependent Claim
36 words
The curable matrix resin formulation of claim 2, characterized in that said rubber particles are formed by spray drying a cross-linked carboxylated rubber selected from the group consisting of carboxylated styrene-butadiene-acrylonitrile rubber and carboxylated acrylic rubber.
Claim 5
Dependent Claim
26 words
The curable matrix resin formulation fo claim 2 or 3, characterized in that it further comprises from 80 to 20 wt% of a continuous fiber reinforcement.
Claim 6
Dependent Claim
45 words
The curable matrix resin formulation of claim 4, characterized in that said continuous fiber reinforcement is a continuous fiber having a tensile strength of greater than 7,000 kg/cm², a tensile modulus of greater than 140,000 kg/cm² psi, and a decomposition temperature of greater than 200°C.
Claim 7
Dependent Claim
48 words
The curable matrix resin formulation of claim 4, characterized in that said continuous fiber reinforcement is a continuous fiber selected from the group consisting of carbon or graphite fibers, glass fibers, fibers formed of silicon carbide, alumina, titania, boron, poly(benzothiazole), poly(benzimidazole), polyarylates, poly(benzoxazole), aromatic polyamides and polyaryl ethers.
Claim 8
Dependent Claim
33 words
The curable matrix resin formulation of claim 4, characterized in that said continuous fiber reinforcement is a continuous fiber selected from the group consisting of carbon or graphite fibers, and aromatic polyamide fibers.
Claim 9
Dependent Claim
43 words
A fiber reinforced composite structure, characterized in that it comprises the matrix resin formulation of claim 4, 5, 6 or 7, said matrix resin formulation being cured and having a phase-separated morphology including a glassy discontinuous phase dispersed in a glassy continuous phase.
References Cited (Backward Citations)
No citation records indexed.
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