Abstract: The present invention relates to a reactivable paper and to a process for obtaining it.The paper consists of fibres with a heat resistance .gtoreq.180.degree. C., bonded together by means of a fibrous binder composed of polyamide or aromatic polyester pulp and of a chemical binder consisting of a polyether-imide of an aromatic polyester or of a resin of polyimide type, with a particle size smaller than 100 .mu.m, a softening point of between 50.degree. and 200.degree. C., and a degree of crosslinking of between 0.025 and 0.25. The weight proportion of fibres in the finished paper is generally preferably between 45 and 85%, that of the fibrous binder between 5 and 20%, that of the chemical binder between 10 and 50%.The papers are obtained by a wet route and find wide applications as a function of the degree of conversion of the resin, for example as a dielectric.

Abstract: A process for forming a self-supporting preform layer of a homogeneous blend of relatively long glass staple length fibers and wettable fine denier staple length thermoplastic filaments wherein a neutral pH aqueous slurry of the glass fibers and filaments are formed into a mat using conventional papermaking equipment. In the preferred process the wettable thermoplastic filaments are dispersed first in the water then followed by the addition of the glass fibers. The self-supporting preform when converted into a molded composite structure results in a substantially void-free structure of individual glass fibers embedded in a thermoplastic resin matrix.

Abstract: In accordance with the present invention, there is provided herein improved glass fiber dispersions for making uniform glass fiber mats by the wet-laid process. The well dispersed glass fiber compositions of this invention usually are prepared by mixing chopped glass fiber bundles in water with a small amount of a propoxylated fatty amine ethoxylate surfactant to disperse the bundles into individual fibers. As a feature of the invention, the dispersions may be formed at relatively high glass fiber consistencies. The resultant dispersions are characterized by low foaming and can be used to make very high quality glass fiber mats at high rates of production.

Abstract: In accordance with the present invention, there is provided herein improved glass fiber dispersions for making uniform glass fiber mats by the wet-laid process. The well dispersed glass fiber compositions of this invention usually are prepared by mixing chopped glass fiber bundles in water with a small amount of an alkylamidoalkyl sultaine surfactant to disperse the bundles into individual fibers. As a feature of the invention, the dispersions may be formed at relatively high glass fiber consistencies. The resultant dispersions then are used to make very high quality glass fiber mats at high rates of production.

Abstract: A web of nonwoven fibers and thermoplastic matrix polymer is provided that is capable of yielding improved physical properties for articles molded from the web. Also provided are the aqueous dispersion to produce the web and the dried web as a laminate so that it can be molded into shaped articles. The web in addition to the fibers and thermoplastic matrix polymer has a chemically modified thermoplastic polymer. This material can be added to the web by direct addition to the aqueous dispersion or by presence in a mat binder which is applied to the web. Generally, the amount of the chemically modified thermoplastic material present in the web is in the range of around 0.1 to 20 weight percent of the web. When the chemically coupled thermoplastic polymer is added as a mat binder, it can be accompanied by an electron donating organo coupling agent, a stabilizing agent such as one or more carboxylic acids and/or anhydrides which may be monocarboxylic, polycarboxylic aliphatic or cyclic.

Abstract: A process for producing an inorganic fiber-based prepreg sheet, which comprises preparing a slurry containing 35-80% by weight of a phenolic resin powder of 0.01-100 .mu.m in average particle diameter, 65-20% by weight of an inorganic fiber (the amounts are based on the total amount of the two) and a nonionic high-molecular fixing agent, making the slurry into a sheet in the same manner as in the paper making, and allowing the sheet to contain a silane coupling agent; and a process for producing an insulating laminate, which comprises laminating a prepreg sheet produced by the above process.

Abstract: Paper, cardboard or paperboard-like material containing inorganic fibres, inorganic particle-like additives and organic binders and flocculating agents characterized in that(1) the particle-like inorganic additives constitute 40-80% by weight of the dry matter of the material;(2) the inorganic particle-like additives are composed of(2.1) a base filler of which at least 20% by weight has a particle size of <2 .mu.m and not more than 20% by weight has a particle size of >20 .mu.m on the one hand and <0.5 .mu.m on the other hand, and(2.2) an anionic flocculating active pigment of which at least 50% by weight has a primary particle size of <2 .mu.m,(3.1) the organic flocculating agent is a cationic polymeric carbohydrate with an average molecular weight of 100,000 to 2,000,000 and a degree of substitution of 0.01 to 0.3 and is present in a quantity of 0.5 to 6% by weight, based on the dry matter of the material, and(3.2) 1000 g of base filler is unable to bind more than 0.

Abstract: The present invention relates to a basic composition for the manufacture of a product in sheet form, obtained in particular by the wet method, of the type comprising a mixture of a polymer powder of given granulometry and of fibers, characterized in that it comprises a preferably intimate mixture of:a) at least one elastomer powder, of granulometry less than about 500 .mu.m, called elastomer fine dust, andb) fibers of length less than about 10 mm, selected from the group composed of natural fibers, inorganic fibers and mixtures thereof.

Abstract: An air permeable sheet-like structure comprising 5% to 50% by weight of reinforcing fibres, and between about 5 and about 50 millimeters long, and from 50% to 95% by weight of wholly or substantially unconsolidated particulate non-cross-linked elastomeric material, and in which the fibrous and elastomeric components are bonded into an air permeable structure.

Abstract: A method of making a fibrous web containing at least two particulate materials and which includes mixing the dry particulate materials together in a substantially dry condition, using the dry mix to form at least part of an aqueous dispersion of fibres, and draining the dispersion to form a web.

Abstract: A method for making a heat resistant nonwoven fabric is provided. A formaldehyde-free binder composition containing a carboxy group, or a carboxylic anhydride, or salts of a carboxy group; and a .beta.-hydroxyalkyl amide contacts a nonwoven fabric containing heat-resistant fibers, and heating the binder composition is effected.

Abstract: A high strength fibrid-floc sheet is made of a floc which can be carbon, aramid or glass. The fibrids are made from the following units: ##STR1## where n is 4 or 5; X is from 0.03 to 0.30 and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 4,4'-sulfonyldiphenylene, 1,3-phenylene, 1-methyl-2,4-phenylene, and mixtures of such radicals with each other or mixtures of such radicals with up to 50 mol percent of 1,4-phenylene radicals based on the mixtures of radicals.

Abstract: Mineral paper is provided which comprises a wet-laid sheet of 1) fibers, 2) a floc of a silicate selected from the group consisting of mica and vermiculite, the said floc having a cationic polymeric flocculant having a molecular weight in the range of from about 10,000 to about 1,000,000, and 3) a non-ionic polymeric flocculant having a molecular weight of from about 2,000,000 to about 10,000,000. A process is described herein for the preparation of the paper using the two flocculants by first flocculating with the cationic polymeric flocculant and then flocculating in another step with the non-ionic polymeric flocculant to obtain an easily drained flocculated mixture which is dewatered to obtain the mineral paper.

Abstract: A multilayered structural article having improved resistance to delamination and having a reduced coefficient of linear thermal expansion (CLTE) relative to that of the thermoplastic resin(s) employed in its preparation comprises a core layer of a highly filled composite paper having outer layers of thermoplastic resin adhered thereto.

Abstract: There is provided a high temperature resistant, insulating inorganic paper for use in high temperature environments. The paper containing a combination of staple ceramic fibers and staple glass fibers interlocked together into a shape sustaining form and having a thickness of from 10 mils to 1 inch. The glass fibers content is from about 0.5 to 10% and the average diameter of the glass fibers is up to about 50 microns.

Abstract: Non-inflammable light-weighing tough boards to be used for structural and decorative material in housing and building, such as, decorative ceiling boards, sliding door overlays, partitions and so on, prepared by corrugating cardboard made of phosphated wood pulp and inorganic fiber and processing the so obtained corrugated board by impregnating with a toughening solution of inorganic toughening agent and then drying it.

Abstract: A three layer structural sheet material having improved resistance to delamination comprising a core layer of a composite paper having outer surface layers of thermoplastic resin adhered to both major surfaces thereof.

Abstract: A glass fiber mat having improved strength and fiber wettability is provided by incorporation of a critical amount of between 1% and 6% by weight (solids) of a carboxylated styrene-butadiene latex having a pH between about 5 and about 8.5, a glass transition temperature (Tg) less than 25.degree. C. and a surface tension less than 50 dynes/cm, and 94% and 99% by weight (solids) of a urea-formaldehyde resin solution having a pH of from about 6.5 to about 8.5.

Abstract: The invention relates to a glass microfibre based paper, the said fibres being obtained by centrifugal processing of molten glass which is drawn by an annular gas flow at elevated temperature and velocity, which passes along the peripheral wall of the centrifuge. The centrifuge rotates at a peripheral velocity of between 50 and 20 m/sec. and the quantity of glass drawn is less than 6 tons per day and per meter of centrifuge periphery in the case of microfibres of 2 to 3 microns and less than 1 ton per day and per meter of centrifuge periphery in the case of microfibres of less than 1 micron.

Abstract: A method and a device for manufacturing a board- or sheet shaped material with a high amount of glass or mineral wool fibres and produced in e.g. a board- or paper making machine. The purpose of the invention is to provide a wetting of the fibres and a distribution of them in aqueous phase so that they can be mixed with the other ingredients, paper pulp and binding agent, to a mass with the desired composition. The fibres are fed in air stream into a cyclon, after the outlet of which the fibre stream is accelerated under simultaneous supply of water or steam, which replaces the air about the fibres. The wetted fibres are then mixed with paper pulp and binding agent and supplied to a device for producing a board- or sheet-shaped material, such as a board- or paper making machine.

Abstract: A method of preventing the interaction of cationic softeners coated upon the surfaces of glass fibers with anionic polymers contained in aqueous baths used in forming the glass fibers into mats which comprises treating the fiber with at least 3 parts per million, of a water-soluble anionic vinyl polymer having a molecular weight range of from 500-50,000.

Abstract: A method is disclosed for the formation of three dimensional composite articles by use of an aqueous slurry containing thermoplastic powder. The slurry is retained by a rotating wheel that is capable of dewatering and drying the slurry sufficiently within molds carried by the wheel so as to dimensionally stabilize the three dimensional composite prior to its release from the wheel. The thermoplastic powder used in the process of the present invention has a specific gravity greater than 1, and therefore mixes homogeneously with the other components of the aqueous slurry so as to yield a composite having similar mechanical properties across its entire cross section.

Abstract: According to this invention there is provided a method for producing glass mat using glass having a relatively high alkali content which comprises chopping the glass fibers while wet and thereafter freezing the wet fiber glass in order to prevent leaching of the alkali constituents. The frozen glass fiber can then be crushed and used to prepare a glass fiber mat in a wet process.

Abstract: An air permeable sheet-like structure comprising 20% to 60% by weight of reinforcing fibers having a high modulus of elasticity (as herein defined), and being between about 7 and about 50 millimeters long, and 40% to 80% by weight of wholly or substantially unconsolidated particulate plastics material, and in which the fibrous and plastics components are bonded into an air permeable structure.

Abstract: A paper-like product composed of staple fibers oriented substantially in a certain specific direction is provided, wherein the orientation degree of the constituent staple fibers, expressed by the following formula: ##EQU1## is at least 50%. A prepreg is formed by impregnating the paper-like product with a matrix resin. Composite prepregs are formed by laminating a plurality of such prepregs or such a prepreg with a prepreg composed of continuous filaments, in a manner such that the orientation directions of fibers in the prepregs intersect one another. The paper-like product is prepared by scattering a liquid dispersion of staple fibers in the horizontal direction by a centrifugal force, and collecting the scattered staple fibers in the form of a web on a collecting surface continuously moving in the vertical direction.

Abstract: Treated glass fibers are provided that are more dispersible in aqueous media. The glass fibers are treated with a composition having a nonionic surfactant and a cationic quaternary ammonium salt surfactant. The composition may be added simultaneously or sequentially with the chopped glass fibers to the aqueous media in which the glass fibers are to be dispersed. Also, glass fibers can be treated with an aqueous treating composition having the composition and produced into wet or dry chopped glass fibers having a length of about 1/16 of an inch to about 3 inches. The treated glass fibers have good dispersibility in aqueous media with or without the addition of dispersing agents.

Abstract: A bonded fibre insulation batt is produced by ragging, teasing and otherwise doffering fibres of wool and/or synthetic or other natural fibres such as monoacrylic, acrylic, polyamide, polyester or cotton fibres, so as to form a sliver with said fibres randomly dispersed. The sliver is passed through a lapper which causes the sliver to lap on itself to form a mat of desired thickness. The sliver is sprayed with a resin emulsion prior to lapping so that the mat produced is throughly impregnated. The resin emulsion can include a fireproofing resin, and preferably a pesticide and a smoke retardant. The impregnated mat passes to a dryer to remove a substantial part of the water content thereof with minimal heating of the fibres. Following the water removal the mat passes to an oven to cure the resin thus forming the insulating batt which can be cut to desired size.

Abstract: The present invention discloses a process of forming glass, glass-ceramic or ceramic matrix, fiber reinforced composite articles. The method comprises preparing both the matrix and the reinforcement into fibers, which are then chopped into relatively short lengths. These chopped fibers are then formed into hybrid felt papers comprising a mixture of both reinforcing fibers and matrix fibers. These felt papers are then cut into preforms and stacked one on top of the other to form a lay-up. The lay-up is then placed in a die and densified to form the composite article.

Abstract: Processes for the preparation of random-fiber thermoset composite sheets by employing a latent curing agent thermoset resin formulation or a coreactant thermoset system such that uncured thermoset composite sheets are formed which can be subsequently formed and cured into articles of manufacture.

Abstract: A selectively stable latex has discrete polymer particles which have present as bound charges both a pH independent charge (such as sulfonium) and a pH dependent charge of opposite polarity of the pH independent charge (such as carboxyl), wherein the two charges are present in such proportion that the latex is stable in at least one pH range and controllably unstable in at least one pH range. The latexes of the invention are extremely useful in the preparation of fibrous composites such as highly-filled composite paper and fine printing paper.

Abstract: The present invention concerns our discovery that aqueous cellulosic slurries comprising primary binder, newsprint, sulfite pulp, and vegetable shell flour can be prepared and formed as desired into various configurations. The materials thus formed are usable for a variety of purposes including furniture, paneling and flooring structures.

Abstract: Method of making glass fiber mat of improved tensile strength by forming the mat from a plurality of glass fibers and a binder composition therefor which consists essentially of a urea-formaldehyde resin and alkoxylated alkyl amine surfactant.

Abstract: An improved inorganic fiber mat containing mineral wool, preferably a composite mat of mineral wool and fiberglass, is prepared by:(a) forming an aqueous slurry of the inorganic fiber raw material containing non-fibrous, particulate contaminants;(b) agitating the slurry to separate heavier contaminant materials;(c) passing the slurry through a unique cleaning apparatus whereby the moving slurry is cascaded and subjected to air induced hydraulic turbulence to separate any remaining contaminant materials; and(d) thereafter transferring the fibrous material, preferably as an admixture of cleaned mineral wool fibers and glass fibers, to a mat forming device.

Abstract: Non-asbestos flexible sheet material suitable for use in the manufacture of spiral wound gaskets is made by dewatering on a water-permeable conveyor a layer of aqueous slurry and compressing and drying the dewatered layer, the aqueous slurry employed being one that contains the following ingredients in the following proportions by dry weight:china clay 20-50%mica or chlorite 20-50%graphite 10-40%cellulose fibres 2-10%vitreous fibre in wool form 2-10%synthetic organic polymer binder 2-10%.

Abstract: A whitewater dispersant system containing a cationic surfactant and a cationic polyacrylamide. The viscosity modifier of the present invention may include amounts varying from 0 to 90% of a nonionic cellulosic viscosity modifier. The resulting whitewater is particularly effective in dispersing glass fibers in a slurry which is used to form a glass mat. The whitewater preferably has a viscosity lying in the range of from 2 to 12 cps and most preferably about 8 cps.

Abstract: Flexible, microporous, hydrophobic and oleophobic film-like composite structures comprised of from about 25 to about 75 parts by weight of inorganic reinforcing microfibers, particularly glass, and from about 75 to about 25 parts by weight of a polymeric binding agent, preferably a copolymer of ethylene and vinyl acetate, the polymeric binding agent being in the form of a continuous matrix and derived from an emulsion or latex of the binding agent in which the particles of the binding agent are less than about 1 micrometer in size. A treating agent, preferably a fluorinated hydrocarbon, is present in an amount sufficient to render the composite structure hydrophobic and oleophobic.

Abstract: Treated glass fibers are provided that are more dispersible in aqueous media. The glass fibers are treated with a composition having a nonionic surfactant and a cationic quaternary ammonium salt surfactant. The composition may be added simultaneously or sequentially with the chopped glass fibers to the aqueous media in which the glass fibers are to be dispersed. Also, glass fibers can be treated with an aqueous treating composition having the composition and produced into wet or dry chopped glass fibers having a length of about 1/16 of an inch to about 3 inches. The treated glass fibers have good dispersibility in aqueous media with or without the addition of dispersing agents.

Abstract: Ink jet recording sheet comprising more than 1 g/m.sup.2 (as solid content) of water-soluble polymer coated onto the surface of a base sheet comprising uniformly 15-45 wt. parts of synthetic silicate 0.1-1 wt. part of a wet strength additive and 2-10 wt. parts of a particular glass fiber with respect to 100 wt. parts of wood pulp. This ink jet recording sheet provides superior ink absorbency and high recording density without feathering and also has superior stiffness and dimensional stability.

Abstract: What is described herein is a method of improving the wet tensile strength of sized glass fiber mats characterized by forming the mat from a plurality of glass fibers and a binder composition therefor which consists essentially of a urea-formaldehyde resin and about 0.01 to 5% by weight of a surfactant which is both highly water soluble and which wets the surfaces of sized glass fibers. The preferred surfactant is an anionic surfactant such as a sodium dodecylbenzene sulfonate. The glass mats thus made retained up to 79% of their tensile strength upon being subjected to severe wet conditions.

Abstract: Reinforced polymer composites having a uniform mix of fiber, polymer and binder and having good physical properties are prepared by forming dilute aqueous slurries of a solid heat fusible organic polymer, a reinforcing material and a bound charge latex binder.

Abstract: Nonwoven mats or sheets having improved tensile strengths are prepared from a fibrous suspension of synthetic fibers thickened with a synthetic, addition polymer bearing pendant carboxamide groups and a cross-linking agent for the polymeric thickener. For example, a fibrous suspension comprising glass fibers, a polymer of acrylamide and a water-soluble hypohalite can be employed to prepare strong, glass fiber mats useful as effective reinforcement for roofing shingles.

Abstract: An improved process for forming an acoustical or thermal insulating fibrous glass product is provided, wherein the binder employed is asphalt and the asphalt is converted into a substantially insolubilized form.

Abstract: A uniform, stable low foam aqueous dispersion of glass fibers can be accomplished with the present invention. This accomplishment is obtained by the use of a unique combination of an alkyl sulfate quaternary salt of an alkyl amino fatty amine or amide and a water dispersible, liquid mineral oil, inorganic silica defoaming agent. The blend of the dispersing agent and the defoaming agent can be present on the glass fibers to be dispersed in the liquid solution or can be added to the aqueous solution prior to the addition of the glass fibers.

Abstract: A carboxylated latex is added to an aqueous slurry of fibers to remove metal ions contained in solution. The water is removed to form a felt. The demetallized water removed during felt formation is recycled in a closed process water system. The carboxylated latex is formed by polymerizing an unsaturated carboxylic acid on a substantially surfactant free styrene-diene polymer latex.

Abstract: A method of manufacturing a fibrous, nonwoven, flow filter tube and the filter tube so prepared, which method comprises forming a filter tube from an aqueous slurry containing an admixture of both low-melting-point binder and high-melting-point filter fibers, and, thereafter, heating the filter tube to a temperature greater than the temperature of the low-melting-point fibers and less than the temperature of the high-melting-point fibers, to effect melting of the low-melting-point fibers, the molten material of the low-melting point fibers forming at the crossover points of the high-melting-point fibers to act as a bonding agent, thereby preparing a nonwoven, self-supporting, fibrous filter tube composed of the filter fibers.

Abstract: A uniform, stable low foam aqueous dispersion of glass fibers can be accomplished with the present invention. This accomplishment is obtained by the use of a unique combination of an alkyl sulfate quaternary salt of an alkyl amino fatty amine or amide and a water dispersible, liquid mineral oil, inorganic silica defoaming agent. The blend of the dispersing agent and the defoaming agent can be present on the glass fibers to be dispersed in the liquid solution or can be added to the aqueous solution prior to the addition of the glass fibers.

Abstract: In order to obtain a more uniform sheet-like glass fiber product, it has been discovered that the use of a treating formulation having phosphate esters of polyoxyalkylene alkyl alcohol, polyamine compound, organic acid with glass fibers gives a more uniform aqueous dispersion of glass fibers. The treating formulation can be added to the aqueous solution to which the glass fibers are to be dispersed and then the more uniform aqueous dispersion of glass fibers is conveyed to a separator to produce the more uniform sheet-like glass fiber product from the aqueous dispersion and the aqueous dispersion is recyled to disperse fresh glass fibers. Also, the treating formulation can be present by itself on glass fibers that are in a wet condition. In addition, the treating formulation can be present on glass fibers that are in a dry condition when the treating formulation is applied to the glass fibers from a sizing composition containing the treating formulation and a film-former.

Abstract: A machine and method of forming fiberglass mats. Chopped glass fibers are mixed with water in a slurry and a movable screen is passed, generally upwardly, through a slurry. As the screen is moved, its surface is uniformly coated with the glass fibers in a uniformly increasing depth, dependent upon the length of travel of the screen through the slurry. Longitudinally oriented and randomly oriented continuous strands are projected onto the fibers captured on the screen at different locations in order to provide the resultant mat with tear strength in all directions. The screen passes over a vacuum for removal of most of the water from the workpiece; subsequently, a binder is added to the workpiece and the continuous mat is passed through an oven for curing of the binder. The mat is then wound upon a spool for later transport to a location in which the mat can be processed into a final product.

Abstract: An air filtration mat formed from a mixture of certain proportions of glass micro-fibers, an intimate blend or cobeat of cellulose fibers and micro-bits of an expanded, non-brittle polystyrene, lower polyolefin, or flexible polyurethane, and an organic binding agent such as polyvinyl alcohol or aqueous acrylic or vinyl chloride polymer emulsions distributed uniformly throughout the glass micro-fibers and blend of cellulose fibers and micro-bits. The glass micro-fiber component is made up of an array of fibers having various dimensions, which are mixed in specific proportions. The filter mat may optionally contain fibers of a fiber-forming terephthalate polyester to enhance the wet strength of the web during processing.

Abstract: Non-woven glass-fiber webs for reinforcing plastics material carrying printed circuits are produced by the wet process from E-glass fibers bonded with polyvinyl alcohol. The polyvinyl alcohol used is a powder or suspension, has a degree of hydrolization of 98-100%, and a viscosity, as a 4% solution in water of 20.degree. C., of 20-100 cP. Preferably the polyvinyl alcohol has a degree of swelling at 20.degree. C. of between 3 and 8, and in the dry form a particle size of between 50 and 180.mu.. A plurality of these glass fiber webs are impregnated with a solution of an epoxy resin, arranged as a laminate, then compressed at elevated pressure and temperature to form the final laminate.