US5279893A
Expired / Lapsed
US
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Prepregs, process for producing the same and laminates produced with the same
Assignee: Mitsubishi Chemical Corp
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Filing: 1991-11-29
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Granted: 1994-01-18
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Expires: 2011-11-29
Abstract
Abstract A prepreg for fiber-reinforced composite materials comprising (A) a reinforcing fiber having a modulus of elasticity of 200 GPa or more, (B) a fibrous thermoplastic resin having a modulus of elasticity of 100 GPa or less, and (C) a thermosetting matrix resin. The prepreg of the present invention does not only have excellent handling property equivalent to that of the prepreg with the conventional thermosetting resin as a matrix, but also gives excellent toughness to the resulting molded product without injuring the thermal and mechanical properties. Particularly, it has a high resistance to interlaminar fracture when exposed to impact, so that it is preferably used as a structural material for airplanes, etc.
Inventors
- 👤 Toshihiro Hattori
- 👤 Takashi Murata
- 👤 Kazuya Goto
- 👤 Takeshi Kato
- 👤 Shigetsugu Hayashi
- 👤 Hisashi Tada
- 👤 Masahiro Sugimori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:16
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/24; C08J5/247; C08L; C08L63/00; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/20; B29C70/28; B29C70/40; B29C70/50; B29C70/504; B29C70/506; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; C08J5/04; C08J5/047; C08J5/048; C08J5/241; C08J5/243; C08L79/00; C08L79/04; C08L79/08; C08L79/085; C08J2363/00; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24124; Y10T428/24132; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249949; Y10T428/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
69 words
A prepreg for fiber-reinforced composite materials, comprising: A) a reinforcing fiber having a modulus of elasticity of 200 GPa or more, B) a thermoplastic monofilament or multifilament having a modulus of elasticity of 100 GPa or less, and C) a thermosetting matrix resin, said thermoplastic monofilament or multifilament (B) being localized and unidirectionally arranged at regular intervals of 1 to 5 mm on the outer surface of the prepreg.
Claim 2
Dependent Claim
69 words
A prepreg for fiber-reinforced composite materials, comprising: A) a reinforcing fiber having a modulus of elasticity of 200 GPa or more, B) a thermoplastic monofilament or multifilament having a modulus of elasticity of 100 GPa or less, and C) a thermosetting matrix resin, said thermoplastic monofilament or multifilament (B) being localized and unidirectionally arranged at regular intervals of 1 to 5 mm on the outer surface of the prepreg.
Claim 3
Dependent Claim
28 words
A prepreg according to claim 1, wherein the weight ratios of the components (A), (B) and (C) are in the following ranges: A/C=55/45 to 85/15 B/C=0.5/100 to 40/100.
Claim 4
Dependent Claim
24 words
A prepreg according to claim 2, wherein the weight ratio of the components (A) and (C) is in the following range: A/C=60/40 to 75/25.
Claim 5
Dependent Claim
25 words
A prepreg according to claim 3, wherein the weight ratio of the components (B) and (C) is in the following range: B/C=0.5 /100 to 20/100.
Claim 6
Dependent Claim
23 words
A prepreg according to claim 1, wherein the component (C) is a thermosetting matrix resin comprising an epoxy resin as a main component.
Claim 7
Dependent Claim
23 words
A prepreg according to claim 4, wherein the component (C) is a thermosetting matrix resin comprising an epoxy resin as a main component.
Claim 8
Dependent Claim
27 words
A prepreg according to claim 5, wherein the fibrous thermoplastic resin (B) is a thermoplastic resin having a functional group which can react with an epoxy group.
Claim 9
Dependent Claim
47 words
A prepreg according to claim 7, wherein the functional group which can react with an epoxy group is one or more members selected from the group consisting of an amino group, an amide group, a hydroxyl group, a carboxylic group, an isocyanate group and a mercapto group.
Claim 10
Dependent Claim
23 words
A prepreg according to claim 1, wherein the component (C) is a thermosetting matrix resin comprising a polyfunctional maleimide as a main component.
Claim 11
Dependent Claim
23 words
A prepreg according to claim 3, wherein the component (C) is a thermosetting matrix resin comprising a polyfunctional maleimide as a main component.
Claim 12
Dependent Claim
38 words
A prepreg according to claim 10, wherein the thermosetting matrix resin comprising a polyfunctional maleimide as a main component is a resin composition comprising as main components the polyfunctional maleimide and an alkenylphenol copolymerizable with the polyfunctional maleimide.
Claim 13
Dependent Claim
25 words
A prepreg according to claim 1, wherein the component (C) is a thermosetting matrix resin comprising a polyfunctional cyanic acid ester as a main component.
Claim 14
Dependent Claim
25 words
A prepreg according to claim 3, wherein the component (C) is a thermosetting matrix resin comprising a polyfunctional cyanic acid ester as a main component.
Claim 15
Dependent Claim
40 words
A prepreg according to claim 1, wherein the component (C) comprises as a main component a mixture of the polyfunctional maleimide (I) and the polyfunctional cyanic acid ester or its oligomer (II) or a pre-reaction product of (I) and (II).
Claim 16
Dependent Claim
40 words
A prepreg according to claim 3, wherein the component (C) comprises as a main component a mixture of the polyfunctional maleimide (I) and the polyfunctional cyanic acid ester or its oligomer (II) or a pre-reaction product of (I) and (II).
Claim 17
Dependent Claim
23 words
A prepreg according to claim 1, wherein the fibrous thermoplastic resin (B) is obtained by conjugated-spinning two or more kinds of thermoplastic resin.
Claim 18
Dependent Claim
39 words
A process for producing a prepreg according to claim 1, comprising coating a release paper with a thermosetting matrix resin (C), simultaneously supplying thereto a reinforcing fiber (A) and a fibrous thermoplastic resin (B) and then carrying out impregnation.
Claim 19
Dependent Claim
40 words
A process for producing a prepreg according to claim 1, comprising arranging a fibrous thermoplastic resin (B) on a base prepreg obtained from a reinforcing fiber (A) and a thermosetting matrix resin (C) and then carrying out heating and impregnation.
Claim 20
Dependent Claim
42 words
A process for producing a prepreg according to claim 1, comprising coating a release paper with a thermosetting matrix resin (C), arranging thereon and fixing thereto a fibrous thermoplastic resin (B), then laying thereon a reinforcing fiber (A) and carrying out impregnation.
Claim 21
Dependent Claim
46 words
A laminate in which layers comprising a fibrous thermoplastic resin (B) have been formed at the interfaces of the laminate in which pieces of a prepreg of claim 2 comprising a reinforcing fiber (A) and a thermosetting matrix resin (C) have been laid one upon another.
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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) | 1997-01-17 | 1997-07-19 | 1998-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-17 | 2001-07-19 | 2002-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-17 | 2005-07-19 | 2006-01-18 | $7700.00 | Window Closed / Lapsed |