# US 10,246,549 B2 · Fast cure epoxy resins and prepregs obtained therefrom

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- Number: US 10,246,549 B2
- Document ID: US10246549B2
- Status: Granted
- Kind: B2
- Application number: 15/533,310
- Filed: 2015-12-16
- Published: 2017-11-30
- Granted: 2019-04-02
- Earliest claimed: 2014-12-24
- Assignees: Hexcel Holding GmbH
- Applicants: Hexcel Holding GMBH
- Inventors: Bernhard Neumayer
- Web page: https://patentgrep.com/patent/US10246549B2

## CPC

- C08G 59/4021: {Ureas; Thioureas; Guanidines; Dicyandiamides}
- B29B 11/16: comprising fillers or reinforcement {(non-woven fabrics per se D04H1/00, D04H3/00)}
- B32B 5/022: {Non-woven fabric}
- B32B 15/092: comprising epoxy resins
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- C08G 59/245: {aromatic}
- C08G 59/686: {containing nitrogen}
- C08J 5/043: {with glass fibres}
- C08J 5/10: characterised by the additives used in the polymer mixture
- C08J 5/248: {using pre-treated fibres}
- C08J 5/249: {characterised by the additives used in the prepolymer mixture}
- C08K 3/36: Silica
- C08L 63/00: Compositions of epoxy resins; Compositions of derivatives of epoxy resins
- A63C 5/12: Making thereof; Selection of particular materials (materials for the running sole A63C5/056)
- B29K 2063/00: Use of {EP, i.e.} epoxy resins {or derivatives thereof}, as moulding material
- B32B 2260/021: Fibrous or filamentary layer
- B32B 2260/046: Synthetic resin
- C08J 2363/00: Characterised by the use of epoxy resins; Derivatives of epoxy resins
- C08J 2363/02: Polyglycidyl ethers of bis-phenols
- C08J 2463/10: Epoxy resins modified by unsaturated compounds
- C08L 2205/06: having improved processability or containing aids for moulding methods
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- A63C: SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE (water skis B63B32/00, B63B34/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

This invention relates to a composition comprising a semisolid epoxy resin containing a curative dispersed therein. The curative has a particle size such that at least 90% of the particles have a size below 25 pm at ambient temperature of 21° C., wherein the composition further comprises a diluent containing a particulate filler. The composition is used as matrix in prepregs. The use of the diluent increases peel strength of the composition when brought into contact with metal or wood substrate.

## Claims

### Claim 1

A composition comprising a semisolid epoxy resin containing a curative dispersed therein, said curative having a particle size such that at least 90% of the particles have a size below 25 μm at ambient temperature of 21° C., as determined in accordance with ASTM D1214, wherein the composition further comprises a diluent; said diluent comprising a particulate filler selected from micro balloons, glass, carbon, metal and/or combinations of the aforesaid fillers;
and wherein, said composition further comprises a fibrous material, comprising a fleece.

### Claim 2 (depends on 1)

A composition according to claim 1, wherein the composition is in the form of a prepreg.

### Claim 3 (depends on 2)

A composition according to claim 2 wherein the diluent is present on the surface of the fibrous reinforcement material.

### Claim 4 (depends on 1)

A composition according to claim 1 in which at least 90% of the curative has an average particle size below 10 μm.

### Claim 5 (depends on 1)

A composition according to claim 1 in which the curative comprises dicyandiamide.

### Claim 6 (depends on 1)

A composition according to claim 1 in which the curative comprises a urea derivative.

### Claim 7 (depends on 1)

A composition according to claim 1 that can be cured to provide a 95% cure at 120° C. in no more than 10 minutes and a 95% cure at 130° C. in no more than 6 minutes.