Patent US2767707A successfully refreshed from Google Patents.
Patent US4977218A successfully refreshed from Google Patents.
US4977218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxylated rubber particles as tougheners for fiber reinforced composites
Assignee: BP Corp North America Inc
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Filing: 1988-09-26
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Granted: 1990-12-11
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Expires: 2008-09-26
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
2026-11-05 15:04
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
56 words
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., said particles being formed by spray-drying.
Claim 2
Dependent Claim
56 words
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., said particles being formed by spray-drying.
Claim 3
Dependent Claim
30 words
The rubber particles of claim 1 wherein said particles are formed of a carboxylated rubber selected from the group consisting of carboxylated styrene-butadiene-acrylonitrile terpolymers, carboxylated acrylic rubbers and mixtures thereof.
Claim 4
Dependent Claim
19 words
The particles of claim 1 wherein said carboxylated rubber has from about 0.5 to about 3 wt% carboxyl functionality.
Claim 5
Dependent Claim
21 words
The particles of claim 1 wherein said carboxylated rubber is a carboxylated styrene-butadiene-acrylonitrile terpolymer having a Tg of about 26° C.
Claim 6
Dependent Claim
20 words
The particles of claim 1 wherein saidcarboxylated rubber is a carboxylated acrylic rubber having a Tg of about 20° C.
Claim 7
Dependent Claim
63 words
Particles having a smallest dimension in the range of from 1 to about 75 microns comprising a 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, said particles being formed by spray-drying.
Claim 8
Dependent Claim
63 words
Particles having a smallest dimension in the range of from 1 to about 75 microns comprising a 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, said particles being formed by spray-drying.
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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 |