Prepreg, a composite and their uses
AssigneeStick Tech Oy
InventorsPekka Vallittu, Lippo Lassila, Antti Yli-Urpo
Life of this patent
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Abstract
A prepreg containing fibers and a curable matrix, the prepreg having a core and a surface part encasing the core, where the matrix of the core and of the surface part are made of the same material and where the proportion of the matrix to the fibers is higher in the core than in the surface part. A composite obtainable from the prepreg as well as the use of the composite or prepreg are also disclosed.
Claims23
A prepreg comprising fibers and a curable matrix, characterised in that said prepreg has a core and a surface part encasing said core wherein the matrix of the core and of the surface part are made of a same material and in that the proportion of the matrix to the fibers is higher in the core than in the surface part.
The prepreg according to any of the preceding claims, characterised in that the density of the matrix is higher in the core than in the surface part.
The prepreg according to any of the preceding claims, characterised in that the thickness of the surface part is 1-50% of the total thickness of the prepreg.
The prepreg according to any of the preceding claims, characterised in that fibers of the core are essentially unidirectional and continuous.
The prepreg according to any of the preceding claims, characterised in that fibers of the surface part are essentially perpendicular to said essentially unidirectional and continuous fibers of the core.
The prepreg according to any of the preceding claims, characterised in that said fibers of the surface part form a brush-like surface and/or a surface with fiber loops.
The prepreg according to any of the preceding claims, characterised in that the material of said matrix is selected from the group consisting of methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, tetrahydrofurfuryl methacrylate, benzyl methacrylate, morpholinoethyl methacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, diurethane dimethacrylate, 2,2-bis(4-(2-hydroxy-3-methacryloxy)phenyl)propane, methacrylate functionalized dendrimers, other methacrylated hyperbranched oligomers ε-caprolactone, polycaprolactone, polylactides, polyhydroxyproline, polyamides, polyurethane, polyolefins, polyvinyl chloride, mixtures and blends thereof.
The prepreg according to any of the preceding claims, characterised in that said fibers are selected from a group consisting of inert glass fibers, bioactive glass fibers, carbon/graphite fibers, aramid fibers, poly(p-phenylene-2,6-benzobisoxazole) fibers, poly(2,6-diimidazo(4,5-b4′,5′-e)pyridinylene-1,4(2,5-dihydro)phenylene fibers, polyolefin fibers, collagen, cellulose and modified cellulose fibers.
The prepreg according to any of the preceding claims, characterised in that the surface of the fibers of the surface part is functionalised.
The prepreg according to any of the preceding claims, characterised in that the matrix of the surface part is functionalised.
The prepreg according to any of the preceding claims, characterised in that the surface part further comprises a bioactive agent.
A composite obtainable by curing the matrix of a prepreg according to any of the claims
Dependencies are inferred from the claim text.