US5276106A
Expired / Lapsed
US
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Thermoplastic polymer particles in liquid thermosettable resin
Assignee: 3M Co
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Filing: 1991-12-13
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Granted: 1994-01-04
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Expires: 2011-12-13
Abstract
Abstract A thermosettable resin composition having a viscosity that decreases during processing temperatures and increases as the temperature is raised to curing temperatures is provided The composition comprises thermosettable resins and thermoplastic particles that are insoluble in the thermosettable resins at processing temperatures but soluble in the thermosettable resins at curing temperatures. Prepregs prepared from the thermosettable resin composition are also provided.
Inventors
- 👤 Gene B. Portelli
- 👤 William J. Schultz
- 👤 John T. Boden
- 👤 Daniel M. Kaufer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:44
CPC Classifications
C; C08; C08L; C08L63/00; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/243; C08J5/249; C08K; C08K5/00; C08K5/0008; C08K5/0016; C08K5/0025; C08L101/00; C08L2312/00; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0373; H05K3/00; H05K3/22; H05K3/28; H05K3/285; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31511; Y10T428/31525; Y10T428/31529; Y10T428/31551; Y10T428/31565; Y10T428/31573; Y10T428/31598; Y10T428/31605; Y10T428/31678; Y10T428/31681; Y10T428/31721; Y10T428/31725; Y10T428/31736; Y10T428/31739; Y10T428/31743; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2656; Y10T442/2738; Y10T442/2861; Y10T442/2893; Y10T442/2926; Y10T442/2951; Y10T442/2975; Y10T442/2984; Y10T442/2992; Y10T442/60; Y10T442/699
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
189 words
A hot melt coatable thermosettable resin composition comprising: a) a thermosettable mixture that is liquid at a temperature in the range of 20° to 100° C. comprising one or more thermosettable resins and one or more curvatives for the thermosettable resins and b) resin particles of one or more amorphous thermoplastic polymers, said particles being dispersed in the thermosettable mixture at a temperature below the dissolution temperature of the particles, the particles having an average diameter in the range of 0.5 to 50 micrometers, a surface area of at least 1.0 m 2 /g, and a dissolution temperature of 50° C. or higher and being essentially insoluble in the thermosettable resin at temperatures up to 15° C. below the dissolution temperature; said resin composition being free of solvent for the thermoplastic particles and having a viscosity that decreases with increasing temperature up to a dissolution temperature and that increases with increasing temperatures at temperatures above the dissolution temperature, said amorphous particles being completely dissolved in the thermosettable resin at a temperature at least 20° C. below the cure temperature of the resin, and providing a homogeneous cured resin composition.
Claim 2
Dependent Claim
189 words
A hot melt coatable thermosettable resin composition comprising: a) a thermosettable mixture that is liquid at a temperature in the range of 20° to 100° C. comprising one or more thermosettable resins and one or more curvatives for the thermosettable resins and b) resin particles of one or more amorphous thermoplastic polymers, said particles being dispersed in the thermosettable mixture at a temperature below the dissolution temperature of the particles, the particles having an average diameter in the range of 0.5 to 50 micrometers, a surface area of at least 1.0 m 2 /g, and a dissolution temperature of 50° C. or higher and being essentially insoluble in the thermosettable resin at temperatures up to 15° C. below the dissolution temperature; said resin composition being free of solvent for the thermoplastic particles and having a viscosity that decreases with increasing temperature up to a dissolution temperature and that increases with increasing temperatures at temperatures above the dissolution temperature, said amorphous particles being completely dissolved in the thermosettable resin at a temperature at least 20° C. below the cure temperature of the resin, and providing a homogeneous cured resin composition.
Claim 3
Dependent Claim
25 words
The composition according to claim 1 wherein said thermosettable resin is at least one of aromatic epoxy, cycloaliphatic epoxy, N,N'-bismaleimide, and polycyanate monomers and prepolymers.
Claim 4
Dependent Claim
47 words
The composition according to claim 1 wherein said resin particles are at least one of polyesters, polyethers, polycarbonates, polyamides, polyimides, polyetherimides other than said polyimides, and polyamideimides other than said polyamides and polyimides, polyarylates other than said polyester, polysulfones, and polyarylsulfones and polyethersulfones other than said polysalfones.
Claim 5
Dependent Claim
12 words
The composition according to claim 1 wherein said resin particles are polyetherimide.
Claim 6
Dependent Claim
21 words
The composition according to claim 1 wherein said thermosettable resin is an aromatic epoxy and said resin particles are a polyetherimide.
Claim 7
Dependent Claim
22 words
The composition according to claim 1 wherein said resin particles have an average diameter in the range of 0.5 to 40 micrometers.
Claim 8
Dependent Claim
18 words
The composition according to claim 1 wherein the resin particles are prepared by spray drying or by coagulation.
Claim 9
Dependent Claim
31 words
The composition according to claim 2 wherein said thermosettable resin is an aromatic epoxy selected from the group consisting of glycidyl ethers of polyhydric phenols and polyglycidyl derivatives of aromatic amines.
Claim 10
Dependent Claim
28 words
The composition according to claim 1 wherein when the thermosettable resin is an epoxy, said curative is polyamine, an amide, a polycarboxylic acid or anhydride, or a polyphenol.
Claim 11
Dependent Claim
35 words
The composition of claim 1 wherein when the thermosettable resin is an epoxy, said curative is a catalyst selected from organometallic compounds or salts, Lewis acids or bases, imidazoles, tertiary amines, or complexed Lewis acids.
Claim 12
Dependent Claim
38 words
The composition according to claim 2 wherein said N,N'-bismaleimide has the formula ##STR5## wherein Y represents an alkylene group of at least 2 carbon atoms, and Z is a divalent organic group containing at least 2 carbon atoms.
Claim 13
Dependent Claim
31 words
The composition according to claim 11 wherein Z is an aliphatic, cycloaliphatic, aromatic or heterocyclic group, the groups optionally having up to two of each of sulfur and non-peroxidic oxygen atoms.
Claim 14
Dependent Claim
14 words
The composition according to claim 11 wherein Y comprises 2 to 6 carbon atoms.
Claim 15
Dependent Claim
12 words
The composition according to claim 9 wherein said curative is a diamine.
Claim 16
Dependent Claim
42 words
The composition according to claim 2 wherein said polycyanate monomer has the formula N.tbd.CO--R--OC.tbd.N wherein R is a divalent aromatic hydrocarbon residue and comprises at least one aromatic moiety, containing a total of up to 40 carbon atoms, including the aromatic moiety.
Claim 17
Dependent Claim
26 words
The composition according to claim 15 wherein R of said polycyanate is substituted by at least one group inert in the polycyclotrimerization process of said polycyanate.
Claim 18
Dependent Claim
19 words
The composition according to claim 15 wherein R of said polycyanate is selected from the group consisting of ##STR6##
Claim 19
Dependent Claim
21 words
The composition according to claim 1 wherein said resin particles comprise 2 to 50 parts per 100 parts of thermosettable mixture.
Claim 20
Dependent Claim
21 words
The composition according to claim 1 wherein said resin particles comprise 2 to 30 parts per 100 parts of thermosettable mixture.
Claim 21
Dependent Claim
26 words
The composition according to claim 1 further comprising at least one of inert fillers, tougheners, whiskers other than said inert fillers, pigments, dyes, and flame retardants.
Claim 22
Dependent Claim
21 words
The composition according to claim 20 wherein said filler is selected from the group consisting of fibers, powders, and solid microspheres.
Claim 23
Dependent Claim
26 words
The composition according to claim 1 wherein said amorphous thermoplastic polymer particles have a surface area in the range of 1.0 to 12.3 m 2 /g.
Claim 24
Dependent Claim
21 words
The composition according to claim 1 wherein said thermosettable mixture comprises 4,4'-tetraglycidyldiaminodiphenylmethane and 4,4'-diaminodiphenylsulfone, and said resin particulate are polyetherimide particles.
Claim 25
Dependent Claim
26 words
The composition according to claim 1 wherein said resin particles further comprise an amount of a plasticizer sufficient to lower the dissolution temperature of the particles.
Claim 26
Dependent Claim
51 words
The composition according to claim 24 wherein said plasticizer for said thermoplastic particles which are to be dissolved in an epoxy or cyanate resin composition is an epoxy resin, or wherein said plasticizer for said thermoplastic particles which are to be dissolved in an N,N'-bismaleimide monomer or prepolymer is an amine.
Claim 27
Dependent Claim
26 words
The composition according to claim 25 wherein said plasticizer is present in an amount of 5 to 50 parts per 100 parts of said resin particles.
References Cited (Backward Citations)
US3784433A
Cited
US3925300A
Cited
US4048257A
Cited
US4002821A
Cited
US4096107A
Cited
US4157360A
Cited
US4451506A
Cited
US4430479A
Cited
US4478963A
Cited
US4468497A
Cited
EP0108476A1
Cited
US4558078A
Cited
US4524181A
Cited
US4668736A
Cited
US4704331A
Cited
US4780507A
Cited
EP0266986A2
Cited
EP0274899A2
Cited
US4745215A
Cited
US4804740A
Cited
EP0301361A2
Cited
US5002821A
Cited
US4846905A
Cited
US4954195A
Cited
WO1990009410A1
Cited
EP0392348A2
Cited
WO1991002029A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-01-03 | 1997-07-05 | 1998-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-03 | 2001-07-05 | 2002-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-03 | 2005-07-05 | 2006-01-04 | $7700.00 | Window Closed / Lapsed |