Abstract:
The present invention relates to wood pulp and polyareneazole pulp for use as reinforcement material in products including for example friction materials, fluid sealing materials, and papers. The pulp comprises (a) irregularly shaped, wood pulp fibrous structures, (b) irregularly shaped, polyareneazole fibrous structures, and (c) water, whereby wood pulp fibrils and/or stalks are substantially entangled with polyareneazole fibrils and/or stalks. The invention further relates to processes for making such wood pulp and polyareneazole pulp.
Abstract:
This invention relates to a honeycomb core made from paper comprising 20-85 weight percent of carbon fiber floc. The carbon fibers have a non-round cross sectional aspect ratio of at least 1.5:1. The paper has a fiber volume fraction of at least 35%. The arithmetic mean length of the carbon fibers is at least 0.5 mm. and a length weighted mean length of at least 0.9 mm.
Abstract:
This invention relates to an improved flame retardant honeycomb comprising high modulus fiber and a flame retardant thermoplastic binder having a melt point of from 120° C. to 350° C. and a limiting oxygen index of 26 or greater, methods for making the honeycomb, and articles comprising the honeycomb. In a preferred embodiment the paper in the honeycomb has a flame classification of UL-94 V-0.
Abstract:
The present invention relates to wood pulp and polyareneazole pulp for use as reinforcement material in products including for example friction materials, fluid sealing materials, and papers. The pulp comprises (a) irregularly shaped, wood pulp fibrous structures, (b) irregularly shaped, polyareneazole fibrous structures, and (c) water, whereby wood pulp fibrils and/or stalks are substantially entangled with polyareneazole fibrils and/or stalks. The invention further relates to processes for making such wood pulp and polyareneazole pulp.
Abstract:
The invention concerns a paper comprising polypyridobisimidazole fibers, where the apparent density of the paper is from 0.1 to 0.5 g/cm3 and the tensile strength of the paper in N/cm is at least 0.00057X*Y, where X is the volume portion of polypyridobisimidazole in the total solids of the paper in % and Y is basis weight of the paper in g/m2.
Abstract translation:本发明涉及包含聚吡啶二咪唑纤维的纸,其中纸张的表观密度为0.1至0.5g / cm 3,纸张的拉伸强度为N / cm至少为0.00057X * Y,其中X为 聚吡啶并咪唑在纸的总固体中的%和Y是纸的基重,单位为g / m 2。
Abstract:
This invention relates to papers made with fibrids containing a polymer or copolymer derived from a monomer selected from the group consisting of 4,4′diaminodiphenyl sulfone, 3,3′diaminodiphenyl sulfone, and mixtures thereof. Such papers have high thermal stability and accept ink more readily than papers made solely with aramid fibrids.
Abstract:
High compression strength honeycomb is made from polymer paper containing 5 to 35 parts by volume solid material and 65 to 95 parts by volume voids having a normalized peak load at bend equal or greater than 0.33 mgf/(g/m2)̂3 and a Gurley air resistance equal or greater than 50 seconds/100 ml
Abstract translation:高压缩强度蜂窝体由含有5-35体积份固体材料的聚合物纸和65至95份(体积)弯曲时的归一化峰值载荷等于或大于0.33mgf /(g / m 2)3的空隙和Gurley空气 电阻等于或大于50秒/ 100毫升
Abstract:
The invention concerns a fibrous pulp comprising polypyridobisimidazole fiber, the pulp having a Canadian Standard Freeness (CSF) of no more than about 650 ml, a specific surface area of from 0.5 to 50 square meters per gram, a length-weighted average length of from 0.5 to 2.0 mm, and a equilibrium moisture content of greater than 10 percent by weight. Also provided are papers made from such pulp and processes for making the pulp.
Abstract:
This invention relates to processes for making a honeycomb comprising cells having edges forming a face of the honeycomb, the face defined by a plurality of points and having an area of curvature wherein at least two of the points are located in different tangential planes, comprising the steps of: a) bonding a plurality of sheets along parallel lines of adhesive, the sheets comprising 5 to 50 parts by weight thermoplastic material having a melting point of from 120° C. to 350° C., and 50 to 95 parts by weight high modulus fiber having a modulus of 600 grams per denier (550 grams per dtex) or greater, based on the total amount of thermoplastic material and high modulus fiber in the walls; b) pulling the bonded sheets apart in directions perpendicular to the plane of the sheets to form a honeycomb having cells; c) heating the honeycomb to soften the thermoplastic material; d) bending, molding, or forming the honeycomb in a mold or over a form having an area of curvature; and e) cooling the honeycomb to retain the shape of the area of curvature of the mold or form. Other processes for making a honeycomb include steps for impregnation, b-staging, and/or curing of the honeycomb with resin.This invention also relates to a shaped honeycomb made by this processes wherein less than 25 percent of the honeycomb cells in the area of curvature have a re-entrant angle of greater than 180°.
Abstract:
This invention relates to a honeycomb comprising matrix resin and paper, the paper comprising 50 to 80 parts by weight fibrous material having a modulus of 600 grams per denier (550 grams per dtex) or greater, 0 to 50 parts by weight powdered inorganic material, and 20 parts by weight or greater thermoplastic fiber, the improvement comprising the thermoplastic fiber is a binder for the paper and has a melting temperature above the curing temperature of the matrix resin; a glass transition temperature of greater than 100° C., and the weight average molecular weight of the thermoplastic polymer in the thermoplastic fibers changes 20% or less after being maintained for 10 minutes at the melting temperature.One embodiment of this invention includes an article comprising the aforesaid honeycomb, with such articles including a panel or an aerodynamic structure.