High shear modulus aramid honeycomb

Claim 2

A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/ cm 2 .

Claim 3

The honeycomb core of Claim 1 wherein the paper exhibits a density, in the absence of matrix resin, bearing a relationship of:

Claim 4

The honeycomb core of Claim 1 wherein the matrix resin is selected from the group consisting of an epoxy resin and a phenolic resin.

Claim 5

The honeycomb core of Claim 3 wherein the shear modulus of the core is greater than 1000 kg/cm 2 .

Claim 6

A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a shear modulus in accordance with the following relationship: Shear Modulus (kg/cm 2 ) > 7000 x core density (g/cm 3 ).

Claim 7

A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a shear modulus in accordance with the following relationship: Shear Modulus (kg/cm 2 ) > 7000 x core density (g/cm 3 ).

Claim 8

The honeycomb core of Claim 5 wherein the paper exhibits a density, in the absence of matrix resin, bearing a relationship of:

Claim 9

The honeycomb core of Claim 5 wherein the matrix resin is selected from the group consisting of an epoxy resin and a phenolic resin.

Claim 10

The honeycomb core of Claim 7 wherein the shear modulus of the core is greater than 1000 kg/cm 2.

Claim 11

A honeycomb structure comprising a core with hexagonal cells impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a shear modulus in accordance with the following relationship: Shear Modulus (kg/cm 2 ) > 14000 x core density (g/cm 3 ).

Claim 12

A honeycomb structure comprising a core with hexagonal cells impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent polymeric binder material and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a shear modulus in accordance with the following relationship: Shear Modulus (kg/cm 2 ) > 14000 x core density (g/cm 3 ).

Claim 13

The honeycomb core of Claim 9 wherein the paper exhibits a density, in the absence of matrix resin, bearing a relationship of:

Claim 14

The honeycomb core of Claim 9 wherein the matrix resin is selected from the group consisting of an epoxy resin and a phenolic resin.

Claim 15

The honeycomb core of Claim 11 wherein the shear modulus of the core is greater than 1000 kg/cm 2.

Claim 16

A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent MPD-I fibrids and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/ cm 2.

Claim 17

A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent MPD-I fibrids and 50 to 100, weight, percent para-aramid fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/ cm 2.

Claim 18

A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent MPD-I fibrids and 50 to 100, weight, percent PPD-T fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/ cm 2.

Claim 19

A honeycomb structure comprising a core impregnated by a solid matrix resin wherein the core comprises: a) a nonwoven paper including a uniform mixture of 0 to 50, weight, percent MPD-I fibrids and 50 to 100, weight, percent PPD-T fibers and b) a solid matrix resin uniformly distributed throughout the paper such that the para-aramid fibers represent 20 to 80 percent of the total volume of the impregnated core material and wherein the core exhibits a density of 0.015 to 0.24 g/cc and a shear modulus of greater than 1000 kg/ cm 2.