Thermoplastic interleafed resin matrix composites with improved impact strength and toughness
AssigneeAmerican Cyanamid Company
InventorsRobert E. Evans, Kevin R. Hirschbuehler
Life of this patent
Estimating the term…
Abstract
High-performance fiber resin matrix composites are disclosed which are comprised of a first layer comprising reinforcing filaments coated with a thermosetting resin composition and a discrete second layer of a thermoplastic resin. When the composite layers are matched to provide certain minimum strength and elongation properties, composites of unusually high impact strength and resistance to impact damage are achieved which retain their high performance properties over a range of temperatures and environmental exposures.
Claims20
An interleafed fiber resin matrix composite which comprises:
- (A) a fiber resin matrix layer comprising (i) high-strength reinforcing filaments and (ii) a thermosetting resin composition coating said filaments, and
- (B) a discrete interleaf resin layer comprising (i) a thermoplastic resin, adhesively-bondable to said fiber resin matrix layer, wherein said thermosetting resin composition (A)(ii) exhibits shear modulus of at least 90,000 psi at high temperatures or at least 50,000 psi at high temperatures under wet conditions, and said interleaf resin (B) exhibits shear modulus of at least 50,000 psi and a yield strength of at least 3000 psi at high temperatures.
An interleafed fiber resin matrix composite comprising:
- (A) a fiber resin matrix comprising:
- (i) 60%-70% by weight high-strength reinforcing filaments selected from the group consisting of carbon fibers, graphite fibers, nickel-coated such fibers, silver-coated such fibers, nickel-and-silver-coated such fibers, and combinations thereof, and
- (ii) 30%-40% by weight of a thermosetting epoxy resin composition coating said filaments, said epoxy resin composition comprising:
- (a) a polyepoxide compound or combination of compounds,
- (b) a curing agent effective to catalyze polymerization of said polyepoxide compound, and
- (c) a filler;
- and
- (B) a discrete interleaf resin layer comprising:
- a thermoplastic resin, adhesively bondable to said fiber resin matrix layer, wherein said epoxy resin composition (A)(ii) exhibits shear modulus of at least 50,000 psi at high temperatures under wet condiditions, and said interleaf resin (B) exhibits shear modulus of at least 50,000 psi and a yield strength of at least 3000 psi at high temperatures, and sheer strain to failure of at least 6% at -67.degree. F., at least 15% at room temperature and at least 25% at high temperatures.
An interleafed fiber resin matrix composite comprising:
- (A) A fiber resin matrix layer comprising:
- (i) 60%-70% by weight high-strength reinforcing filaments selected from the group consisting of carbon fibers, graphite fibers, nickel-coated such fibers, silver-coated such fibers and nickel-and-silver-coated such fibers, and
- (ii) 30%-40% by weight of a thermosetting epoxy resin composition coating said filaments, said epoxy resin composition comprising:
- (a) 50-100 parts by weight of tetra(4,4')N-glycidyl methylene dianiline,
- (b) 0-50 parts by weight tetra-glycidoxy tetraphenylethane,
- (c) 28-60 parts by weight trimethylene glycol di-para-aminobenzoate,
- (d) 0-12 parts by weight fumed silica, and
- (e) 0.1-2.5 parts by weight of the reaction product of toluene iisocyanate and dimethylamine;
- and
- (B) A discrete interleaf resin layer comprising a thermoplastic polyether polyimide.
An interleafed fiber resin matrix composite which comprises:
- (A) A fiber resin matrix layer comprising (i) 60%-70% by weight high-strength reinforcing filaments and (ii) 30%-40% by weight of a thermosetting resin composition coating said filaments, and
- (B) A discrete interleaf resin layer comprising a thermoplastic resin adhesively bondable to said fiber resin matrix layer, wherein said thermosetting resin composition (A)(ii), subjected to shear forces at 200.degree. F., has an ultimate stress of at least 5000 psi, and wherein said interleaf resin (B), subjected to shear at 200.degree. F. has a yield stress of at least 4000 psi, and an ultimate stress of at least 5000 psi
Dependencies are inferred from the claim text.