US4977215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxylated rubber particles as tougheners for fiber reinforced composites
Assignee: BP Corp North America Inc
•
Filing: 1990-03-21
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Granted: 1990-12-11
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Expires: 2010-03-21
Abstract
Abstract Preformed carboxylated rubber particles are effective for toughening fiber reinforced composite structures based on thermoset resins such as epoxy resin formulations. The composites are effectively toughened by adding the carboxylated rubber particles to the matrix resin prior to curing the composite.
Inventors
- 👤 Hugh C. Gardner
- 👤 Richard H. Newman-Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:41
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08L; C08L13/00; C08L63/00; C08J2313/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A curable matrix resin formulation comprising (a) from 99 to about 75 wt % of an epoxy resin formulation and (b) from 1 to about 25 wt % particles having a smallest dimension in the range of from 1 to about 75 microns comprising a cross-linked carboxylated rubber selected from the group consisting of carboxylated diene rubbers and carboxylated acrylic rubbers, said carboxylated rubber having from 0.1 to 5 wt % carboxyl functionality and a Tg above 15° C.
Claim 2
Dependent Claim
79 words
A curable matrix resin formulation comprising (a) from 99 to about 75 wt % of an epoxy resin formulation and (b) from 1 to about 25 wt % particles having a smallest dimension in the range of from 1 to about 75 microns comprising a cross-linked carboxylated rubber selected from the group consisting of carboxylated diene rubbers and carboxylated acrylic rubbers, said carboxylated rubber having from 0.1 to 5 wt % carboxyl functionality and a Tg above 15° C.
Claim 3
Dependent Claim
17 words
The curable matrix resin formulation of claim 1 wherein said carboxylated rubber is a carboxylated styrene-butadiene-acrylonitrile terpolymer.
Claim 4
Dependent Claim
17 words
The curable matrix resin formulation of claim 1 wherein said carboxylated rubber is a carboxylated nitrile rubber.
Claim 5
Dependent Claim
15 words
The curable matrix resin formulation of claim 1 wherein said particles are formed by spray-drying.
Claim 6
Dependent Claim
99 words
A curable matrix resin formulation comprising (a) from 99 to about 75 wt % of an epoxy resin formulation and (b) from 1 to about 25 wt % particles having a smallest dimension in the range of from 1 to about 75 microns comprising a cross-linked carboxylated rubber selected from the group consisting of carboxylated styrene-butadiene-acrylonitrile terpolymers having a Tg of about 26° C. and carboxylated acrylic rubbers having a Tg of about 20° C., said carboxylated rubber having from 0.1 to 5 wt % carboxyl functionality and a Tg above 15° C., said particles being formed by spray-drying.
Claim 7
Dependent Claim
99 words
A curable matrix resin formulation comprising (a) from 99 to about 75 wt % of an epoxy resin formulation and (b) from 1 to about 25 wt % particles having a smallest dimension in the range of from 1 to about 75 microns comprising a cross-linked carboxylated rubber selected from the group consisting of carboxylated styrene-butadiene-acrylonitrile terpolymers having a Tg of about 26° C. and carboxylated acrylic rubbers having a Tg of about 20° C., said carboxylated rubber having from 0.1 to 5 wt % carboxyl functionality and a Tg above 15° C., said particles being formed by spray-drying.
Claim 8
Dependent Claim
19 words
The curable matrix resin formulation of claim 5 wherein said epoxy resin formulation comprises a cycloaliphatic epoxy ether resin.
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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) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |