US3227608A - Manufacture of synthetic paper sheet - Google Patents

Manufacture of synthetic paper sheet Download PDF

Info

Publication number
US3227608A
US3227608A US391281A US39128164A US3227608A US 3227608 A US3227608 A US 3227608A US 391281 A US391281 A US 391281A US 39128164 A US39128164 A US 39128164A US 3227608 A US3227608 A US 3227608A
Authority
US
United States
Prior art keywords
wax
mixture
polyurethane
fibers
percent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US391281A
Inventor
Willicks Winfried
Grossteinbeck Rolf
Tepel Gert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Battelle Institut eV
Original Assignee
Battelle Institut eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Battelle Institut eV filed Critical Battelle Institut eV
Application granted granted Critical
Publication of US3227608A publication Critical patent/US3227608A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/24—Polyesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/07—Nitrogen-containing compounds
    • D21H17/08—Isocyanates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/53—Polyethers; Polyesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/60—Waxes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
    • D21H5/1272—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of fibres which can be physically or chemically modified during or after web formation
    • D21H5/129—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of fibres which can be physically or chemically modified during or after web formation by thermal treatment
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
    • D21H5/20—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of organic non-cellulosic fibres too short for spinning, with or without cellulose fibres

Definitions

  • the invention relates to improvements in the preparation of paper and non-woven fabrics from synthetic fibers by the wet process.
  • a binder is incorporated in paper and non-woven fabrics made on papermaking machinery by the wet process in such a Way that the binder joins the fibers only at their crossing points homogeneously throughout the entire web.
  • This is accomplished by admixing to the fibers, prior to the formation of a mat or web, a lubricant which is insoluble in water and in the binder, and a binder which at normal temperature, for instance at C., is solid and as little adhesive as possible but is fiuid and becomes adhesive at elevated temperatures of about 80 to 120 C.
  • lubricant and binder must be incompatible under the operating conditions, that is they must be insoluble in each other.
  • the fiber mixture is then formed to a sheet which is subjected to a heat treatment in the drying part of the paper machine. Due to the admixture of lubricant and binding agent to the fibers prior to the sheet formation, the additives are distributed very evenly in the sheet as it is being formed.
  • the lubricants employed are compounds producing a coating film on the fibers which presents a gliding surface on which the molten binder can glide in the form of droplets or globules to collect at the intercrossing points of the fibers. After solidification or curing of the binder, the lubricant may be washed out by a suitable solvent so as to leave the fibers of the fabric essentially with their original surface.
  • the lubricants must be insoluble in water and are either liquid at room temperature or must become fluid at temperatures below 120 C., preferably at temperatures not higher than 80 C. In Serial No. 234,673, rosin and rosin soaps and alkyleneglycol esters of aliphatic monocarboxylic esters have been proposed as lubricants.
  • waxes such as carnauba wax or montan wax, and other fatty acid esters of higher monohydric aliphatic and phytosterol alcohols, and polyaikylenediols of waxy consistency such as polyethylene glycol of a molecular weight of 950-1050 having a melting point of 34-40" C.
  • the preferred binder is a latent adhesive constituted by a polyurethane forming mixture of polyesters and polyisocyanates whose isocyanate groups are blocked by an alcohol or phenol and become reactive only at a temperature of about 100 C.
  • Suitable blocking agents are, for instance, phenol, butanol, aliphatic amines, etc. (see Angewandte Chemie, vol. 59A, pp. 265-266 (1947)).
  • the polyesters and polyisocyanates useful for the polyurethane formation are well known and described in many publications, for instance, in the book Polyurethanes by Bernard A. Dombrow, publ.
  • Suitable polyesters are those of aliphatic polyols such as ethylene glycol, diethylene glycol, hexamethylene glycol, glycerol, and many others with one or more polycarboxylic acids such as adipic acid, sebacic acid, isosebacic acid, phthalic acids and others.
  • the binder and lubricant have been added in form of filaments; this has been done by converting the binder to a filament and then coating the filamentary binder with the lubricant. This method has the drawback to require several process steps to produce the coated filaments.
  • binder-lubricant filaments are quite brittle and lack the flexibility desired for the purpose.
  • very flexible binder-lubricant filaments can be obtained by adding to the binder-lubricant mixture an alkyd resin and extruding the homogeneous binder-lubricant-alkyd resin mixture to filaments.
  • the thus obtained filaments are cut to staple fibers of the desired length; said staple fibers are added to the paper stock, which is then processed to a sheet on a conventional papermaking machine.
  • the temperature of the heated rolls of the dryer part of the machine is adjusted to a temperature suitable for curing the liquefied binder which has collected at the intercrossings of the textile fibers.
  • After washing out the lubricant film formed on the synthetic textile fibers the desired surface properties of said fibers are maintained.
  • the initial wet strength of the web is also essentially maintained.
  • the amount of synthetic textile fibers and binder-lubricant filaments By adjusting the amount of synthetic textile fibers and binder-lubricant filaments, the number of bonded intercrossings, and thereby the elasticity of the final sheet, can be varied. Generally, the lubricant-binder fibers will be empioyed in an amount of 30 to 50 percent by Weight of the weight of the dry textile fibers.
  • the lubricant may be present in amounts of 10 to 100 percent by weight, calcu-. lated on the binder, and the amount of alkyd resin may be in the range or" 5 to 25 percent, calculated on the lubricant-binder mixture.
  • alkyd resins may be used, for instance glycerol or pentaerythritol esters of phthalic anhydride,
  • short oil alkyds modified with linseed oil or other vegetable oils or with saturated lower fatty acids, medium oil alkyds based on dehydrat d castor oil, styrene modified alkyds, and others.
  • Conventional driers such as cobalt or rare earth salts of naphthenic acid, Z-ethylhexoic acid, and other acids used for this purpose may be added to shorten the curing time of the binder after the web has been formed.
  • Example Polyester fibers were beaten in water, and the fibrous mass was introduced into the headbox of a paper forming machine. At the same time, binder-lubricant filaments cut to staple length were added, and the fiber mixture was slurried with water to a dispersion containing a solids concentration of about 0.01. Said highly diluted fiber dispersion was then passed onto the Fourdrinier wire where the desired web was formed and the major part of the water was separated from the fibers.
  • the lubricant-binder filaments had been prepared by extruding the following mixture, all percentages being given by weight:
  • Desmodur AP stable is toluylene diisocyanate whose isocyanate groups are blocked by phenol.
  • Desmophen 1200 is a polyester of adipic acid with a mixture of diols and triols, dissolved in acetone and methylglycol acetate.
  • Alkydal RD18 is prepared from phthalic acid and trimethylolpropane and modified with 25% saturated low molecular fatty acid.
  • Alkydal BG is an unmodified phthalic acid resin.
  • Wax E is an ester wax marketed by Badische Anilin- & Sodafabrik. It is a montan wax (C, number 28) esterified with ceryl and myricyl alcohol and has a melting point of 7982 C., a setting point of 73-75 C., an acid number of 1725 and a saponification number of 158-178.
  • Soligen cobalt is cobalt naphthenate.
  • the binder-lubricant filaments were distributed throughout the web.
  • the web passed over a plurality of heated rolls, the first of which had a surface temperature of 120 C.
  • the web was passed through a heating zone of a total length of about 150 m, within about 15 minutes and was then rewound.
  • the lubricant-binder filaments melted and for-med individual droplets which run on a thin layer of the liquid wax, formed on the textile fibers, to the intercrossing points of the fibers, where they started being cured. Due to the presence of the drier catalyst, the cure was completed within 3 to 5 minutes at 150 C.
  • all synthetic fibers can be used which, due to their preparation from a melt, by extrusion or spinning, and by the subsequent treatments, have a smooth non fibrillated surface; stretched, crimped, or hollow fibers may be used.
  • synthetic fibers are regenerated cellulose fibers from viscose or cuproammonium; polyamides as obtained by the condensation of hexamethylene diamine salt with adipic acid (nylon 66) or e-caprolactam (nylon 6); polyesters from dicarboxylic acid, such as terephthalic or isophthalic acid, with diols or polyols (Diolene, Terylene, Dacron); polyvinyls, e.g.
  • the synthetic fibers may be substituted up to 50 percent by natural fibers without requiring modification of the described procedure.
  • a method of preparing an 'unwoven web material consisting to at least 50 percent by weight of synthetic textile fibers, the balance being natural textile fibers, on a conventional paper-forming machine comprising adding to said textile fibers, prior to their passage through the paperforming machine, about 30 to 50 percent, calculated on the dry weight of said textile fibers, of fibers consisting essentially of a homogeneous mixture of (a) a polyurethane forming mixture of a polyester having at least one free hydroxyl group and a polyisocyanate whose isocyanate groups are blocked by a member of the group consisting of alcohols and phenols but are reactive at a temperature of about C.,
  • a filamentary composition suitable as addition in the manufacture of unwoven web material, consisting essentially of a homogeneous mixture of (a) a poly-urethane forming mixture of a polyester having at least one free hydroxyl group and a polyisocyanate whose isocyanate groups are blocked by a member of the group consisting of alcohols and phenols but are reactive at a temperature of about 100 C.,
  • the filamentary composition of claim 2 containing, in addition, a drier in an amount efiicient to cure said polyurethane-forming mixture on heating.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Nonwoven Fabrics (AREA)

Description

United States Patent 3 227,608 MANUFACTURE OF SYNTHETIC PAPER SHEET Winfried Wiiiicks, Hofheim, Taunus, Rolf Grossteinheck, Qherhochstadt, Taunus, and Gert Tepel, Frankfurt am Main, Germany, assignors to Battelie-Institut e. V., Frankfurt am Main, Germany No Drawing. Filed Aug. 21, 1964, Ser. No. 391,281 Claims priority, application Germany, Aug. 27, 1963, B 73,276 3 Claims. (Cl. 162-146) The invention relates to a development of the method disclosed and claimed in application Serial No. 234,673, filed November 1, 1962, for a Method of Making Paper and Non-Woven Fabric From Synthetic Fibers.
The invention relates to improvements in the preparation of paper and non-woven fabrics from synthetic fibers by the wet process.
According to the method of said earlier invention, a binder is incorporated in paper and non-woven fabrics made on papermaking machinery by the wet process in such a Way that the binder joins the fibers only at their crossing points homogeneously throughout the entire web. This is accomplished by admixing to the fibers, prior to the formation of a mat or web, a lubricant which is insoluble in water and in the binder, and a binder which at normal temperature, for instance at C., is solid and as little adhesive as possible but is fiuid and becomes adhesive at elevated temperatures of about 80 to 120 C. In the liquid state, lubricant and binder must be incompatible under the operating conditions, that is they must be insoluble in each other. The fiber mixture is then formed to a sheet which is subjected to a heat treatment in the drying part of the paper machine. Due to the admixture of lubricant and binding agent to the fibers prior to the sheet formation, the additives are distributed very evenly in the sheet as it is being formed.
The lubricants employed are compounds producing a coating film on the fibers which presents a gliding surface on which the molten binder can glide in the form of droplets or globules to collect at the intercrossing points of the fibers. After solidification or curing of the binder, the lubricant may be washed out by a suitable solvent so as to leave the fibers of the fabric essentially with their original surface. The lubricants must be insoluble in water and are either liquid at room temperature or must become fluid at temperatures below 120 C., preferably at temperatures not higher than 80 C. In Serial No. 234,673, rosin and rosin soaps and alkyleneglycol esters of aliphatic monocarboxylic esters have been proposed as lubricants. We prefer to use natural and synthetic waxes, such as carnauba wax or montan wax, and other fatty acid esters of higher monohydric aliphatic and phytosterol alcohols, and polyaikylenediols of waxy consistency such as polyethylene glycol of a molecular weight of 950-1050 having a melting point of 34-40" C.
The preferred binder is a latent adhesive constituted by a polyurethane forming mixture of polyesters and polyisocyanates whose isocyanate groups are blocked by an alcohol or phenol and become reactive only at a temperature of about 100 C. Suitable blocking agents are, for instance, phenol, butanol, aliphatic amines, etc. (see Angewandte Chemie, vol. 59A, pp. 265-266 (1947)). The polyesters and polyisocyanates useful for the polyurethane formation are well known and described in many publications, for instance, in the book Polyurethanes by Bernard A. Dombrow, publ. by Reinhold Publishing Corp, New York, and in the various publications on Desmodur polyisocyanates) and Desmophen polyester) by Farbenfabriken Bayer AG., see also the articles on Desmodur and Desmophen in Rdmpp, Chemie-Lexikon.
3,227,508 Patented Jan. 4,, 11966 An illustrative list of polyurethane forming polyisocyanates is given in British Patent No. 892,137, pages 11 and 12. Particularly suitable are, for instance, 2,4- tolylene diisocyanate, hexamethylene diisocyanate, tr-iphenylmethane triisocyanate naphthylene 1,5-diisocyanate, and others.
Suitable polyesters are those of aliphatic polyols such as ethylene glycol, diethylene glycol, hexamethylene glycol, glycerol, and many others with one or more polycarboxylic acids such as adipic acid, sebacic acid, isosebacic acid, phthalic acids and others.
In order to ensure homogeneous distribution of the binder and to prevent or reduce the risk that binder is carried away by the white water during formation of the fiber sheet, the binder and lubricant have been added in form of filaments; this has been done by converting the binder to a filament and then coating the filamentary binder with the lubricant. This method has the drawback to require several process steps to produce the coated filaments.
In said earlier application, it has also been proposed to mix lubricant and binder to a homogeneous mixture and to add said mixture in form of filaments to the slurry of the synthetic fibers.
Said binder-lubricant filaments, however, are quite brittle and lack the flexibility desired for the purpose. We have now found that very flexible binder-lubricant filaments can be obtained by adding to the binder-lubricant mixture an alkyd resin and extruding the homogeneous binder-lubricant-alkyd resin mixture to filaments. The thus obtained filaments are cut to staple fibers of the desired length; said staple fibers are added to the paper stock, which is then processed to a sheet on a conventional papermaking machine. The temperature of the heated rolls of the dryer part of the machine is adjusted to a temperature suitable for curing the liquefied binder which has collected at the intercrossings of the textile fibers. After washing out the lubricant film formed on the synthetic textile fibers, the desired surface properties of said fibers are maintained. The initial wet strength of the web is also essentially maintained.
By adjusting the amount of synthetic textile fibers and binder-lubricant filaments, the number of bonded intercrossings, and thereby the elasticity of the final sheet, can be varied. Generally, the lubricant-binder fibers will be empioyed in an amount of 30 to 50 percent by Weight of the weight of the dry textile fibers.
In the lubricant-binder filaments, the lubricant may be present in amounts of 10 to 100 percent by weight, calcu-. lated on the binder, and the amount of alkyd resin may be in the range or" 5 to 25 percent, calculated on the lubricant-binder mixture.
A wide range of alkyd resins may be used, for instance glycerol or pentaerythritol esters of phthalic anhydride,
' short oil alkyds modified with linseed oil or other vegetable oils or with saturated lower fatty acids, medium oil alkyds based on dehydrat d castor oil, styrene modified alkyds, and others.
Conventional driers such as cobalt or rare earth salts of naphthenic acid, Z-ethylhexoic acid, and other acids used for this purpose may be added to shorten the curing time of the binder after the web has been formed.
The following example is given to illustrate and not to limit the invention.
Example Polyester fibers were beaten in water, and the fibrous mass was introduced into the headbox of a paper forming machine. At the same time, binder-lubricant filaments cut to staple length were added, and the fiber mixture was slurried with water to a dispersion containing a solids concentration of about 0.01. Said highly diluted fiber dispersion was then passed onto the Fourdrinier wire where the desired web was formed and the major part of the water was separated from the fibers.
The lubricant-binder filaments had been prepared by extruding the following mixture, all percentages being given by weight:
Desmodur AP stable is toluylene diisocyanate whose isocyanate groups are blocked by phenol.
Desmophen 1200 is a polyester of adipic acid with a mixture of diols and triols, dissolved in acetone and methylglycol acetate.
Alkydal RD18 is prepared from phthalic acid and trimethylolpropane and modified with 25% saturated low molecular fatty acid.
Alkydal BG is an unmodified phthalic acid resin.
Wax E is an ester wax marketed by Badische Anilin- & Sodafabrik. It is a montan wax (C, number 28) esterified with ceryl and myricyl alcohol and has a melting point of 7982 C., a setting point of 73-75 C., an acid number of 1725 and a saponification number of 158-178.
Soligen cobalt is cobalt naphthenate.
After passage through the wire section of the paperforming machine, the binder-lubricant filaments were distributed throughout the web. In the drying section, the web passed over a plurality of heated rolls, the first of which had a surface temperature of 120 C. The web was passed through a heating zone of a total length of about 150 m, within about 15 minutes and was then rewound.
In the heating zone, the lubricant-binder filaments melted and for-med individual droplets which run on a thin layer of the liquid wax, formed on the textile fibers, to the intercrossing points of the fibers, where they started being cured. Due to the presence of the drier catalyst, the cure was completed within 3 to 5 minutes at 150 C.
For the manufacture of the web, all synthetic fibers can be used which, due to their preparation from a melt, by extrusion or spinning, and by the subsequent treatments, have a smooth non fibrillated surface; stretched, crimped, or hollow fibers may be used. Examples of such synthetic fibers are regenerated cellulose fibers from viscose or cuproammonium; polyamides as obtained by the condensation of hexamethylene diamine salt with adipic acid (nylon 66) or e-caprolactam (nylon 6); polyesters from dicarboxylic acid, such as terephthalic or isophthalic acid, with diols or polyols (Diolene, Terylene, Dacron); polyvinyls, e.g. from vinyl chloride, vinyl acetate, styrene, vinylene chloride, and copolymers thereof; polyacrylics from acrylonitrile (e.g. DralQn); copolymers of vinyl compounds and/or styrene and acrylonitrile; polyolefins, for
Also glass The synthetic fibers may be substituted up to 50 percent by natural fibers without requiring modification of the described procedure.
We claim:
1. A method of preparing an 'unwoven web material consisting to at least 50 percent by weight of synthetic textile fibers, the balance being natural textile fibers, on a conventional paper-forming machine comprising adding to said textile fibers, prior to their passage through the paperforming machine, about 30 to 50 percent, calculated on the dry weight of said textile fibers, of fibers consisting essentially of a homogeneous mixture of (a) a polyurethane forming mixture of a polyester having at least one free hydroxyl group and a polyisocyanate whose isocyanate groups are blocked by a member of the group consisting of alcohols and phenols but are reactive at a temperature of about C.,
(b)' a wax having a melting point below the melting point of said polyurethane, and
(c) an alkyd resin, the proportion of said polyurethane forming mixture to said wax being about 1:0-1-1, and the amount of said alkyd resin being about 5 to 25 percent by weight of the total polyurethane-wax mixture.
2. A filamentary composition, suitable as addition in the manufacture of unwoven web material, consisting essentially of a homogeneous mixture of (a) a poly-urethane forming mixture of a polyester having at least one free hydroxyl group and a polyisocyanate whose isocyanate groups are blocked by a member of the group consisting of alcohols and phenols but are reactive at a temperature of about 100 C.,
(b) a wax having a melting point below the melting point of said polyurethane, and
(c) an alkyd resin, the proportion of said polyurethane forming mixture to said wax being about 1201-1, and the amount of said alkyd resin being about 5 to 25 percent by weight of the total polyurethane-wax mixture. I
3. The filamentary composition of claim 2 containing, in addition, a drier in an amount efiicient to cure said polyurethane-forming mixture on heating.
References Cited by the Examiner UNITED STATES PATENTS 2,680,995 6/1954 Frost l62185 2,962,762 12/1960 Hartmann l62l57 3,049,466 8/1962 Erlich l62l57 3,053,609 9/1962 Miller l62l57 3,096,231 7/1963 Griggs l62l57 FOREIGN PATENTS 572,962 10/1945 Great Britain.
' DONALL H. SYLVESTER, Primary Examiner.

Claims (2)

1. A METHOD OF PREPARING AN UNWOVEN WEB MATERIAL CONSISTING TO AT LEAST 50 PERCENT BY WEIGHT OF SYNTHETIC TEXTILE FIBERS, THE BALANCE BEING NATURAL TEXTILE FIBERS, ON A CONVENTIONAL PAPER-FORMING MACHINE COMPRISING ADDING TO SAID TEXTILE FIBERS, PRIOR TO THEIR PASSAGE THROUGH THE PAPERFORMING MACHINE, ABOUT 30 TO 50 PERCENT, CALCULATED ON THE DRY WEIGHT OF SAID TEXTILE FIBERS, OF FIBERS CONSISTING ESSENTIALLY OF A HOMOGENEOUS MIXTURE OF (A) A POLYURETHANE FORMING MIXTURE OF A POLYESTER HAVING AT LEAST ONE FREE HYDROXYL GROUP AND A POLYISOCYANATE WHOSE GROUPS ARE BLOCKED BY A MEMBER OF THE GROUP CONSISTING OF ALCOHOLS AND PHENOLS BUT ARE REACTIVE AT A TEMPERATURE OF ABOUT 100*C., (B) A WAX HAVING A MELTING POINT BELOW THE MELTING POINT OF SAID POLYURETHANE, AND (C) AN ALKYD RESIN, THE PROPORTION OF SAID POLYURETHANE FORMING MIXTURE TO SAID WAX BEING ABOUT 1:0-1-1, AND THE AMOUNT OF SAID ALKYD RESIN BEING ABOUT 5 TO 25 PERCENT BY WEIGHT OF THE TOTAL POLYURETHANE-WAX MIXTURE.
2. A FILAMENTARY COMPOSITION, SUITABLE AS ADDITION IN THE MANUFACTURE OF UNWOVEN WEB MATERIAL, CONSISTING ESSENTIALLY OF A HOMOGENEOUS MIXTURE OF (A) A POLYURETHANE FORMING MIXTURE OF A POLYESTER HAVING AT LEAST ONE FREE HYDROXYL GROUP AND A POLYISOCYANATE WHOSE ISOCYANATE GROUPS ARE BLOCKED BY A MEMBER OF THE GROUP CONSISTING OF ALCOHOLS AND PHENOLS BUT ARE REACTIVE AT A TEMPERATURE OF ABOUT 100*C., (B) A WAX HAVING A MELTING POINT BELOW THE MELTING POINT OF SAID POLYURETHANE, AND (C) AN ALKYD RESIN, THE PROPORTION OF SAID POLURETHANE FORMING MIXTURE TO SAID WAX BEING ABOUT 1:0.1-1, AND THE AMOUNT OF SAID ALKYD RESIN BEING ABOUT 5 TO 25 PERCENT BY WEIGHT OF TOTAL POLYURETHANE-WAX MIXTURE.
US391281A 1961-11-02 1964-08-21 Manufacture of synthetic paper sheet Expired - Lifetime US3227608A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DEG33481A DE1159257B (en) 1961-11-02 1961-11-02 Process for the production of paper or sheet-like structures from synthetic fibers
DEG34052A DE1164818B (en) 1961-11-02 1962-01-18 Process for the production of paper or sheet-like structures from synthetic fibers
DEG34836A DE1176993B (en) 1961-11-02 1962-04-27 Process for the manufacture of nonwoven fabrics from synthetic fibers
DEG35413A DE1176994B (en) 1961-11-02 1962-07-07 Process for the manufacture of nonwoven fabrics from synthetic fibers
DEB73276A DE1229376B (en) 1961-11-02 1963-08-27 Process for the production of synthetic papers and non-woven fabrics from synthetic fibers

Publications (1)

Publication Number Publication Date
US3227608A true US3227608A (en) 1966-01-04

Family

ID=27511925

Family Applications (2)

Application Number Title Priority Date Filing Date
US234673A Expired - Lifetime US3200033A (en) 1961-11-02 1962-11-01 Method of making paper and non-woven fabric from synthetic fibers
US391281A Expired - Lifetime US3227608A (en) 1961-11-02 1964-08-21 Manufacture of synthetic paper sheet

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US234673A Expired - Lifetime US3200033A (en) 1961-11-02 1962-11-01 Method of making paper and non-woven fabric from synthetic fibers

Country Status (8)

Country Link
US (2) US3200033A (en)
BE (2) BE652341A (en)
CH (1) CH435965A (en)
DE (5) DE1159257B (en)
DK (1) DK115449B (en)
GB (2) GB1009120A (en)
LU (2) LU42620A1 (en)
NL (3) NL146235B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501431A (en) * 1966-11-25 1970-03-17 Us Air Force Sizing system for high modulus fibers and method and apparatus for applying same
FR2430652A1 (en) * 1978-07-04 1980-02-01 Comp Generale Electricite Synthetic paper for electrical insulation in oil - comprises nonwoven thermoplastic fibre sheet coated with lower melting polymer
US4392861A (en) * 1980-10-14 1983-07-12 Johnson & Johnson Baby Products Company Two-ply fibrous facing material
US4425126A (en) 1979-12-28 1984-01-10 Johnson & Johnson Baby Products Company Fibrous material and method of making the same using thermoplastic synthetic wood pulp fibers

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE638830A (en) * 1962-10-19
ZA74315B (en) * 1973-01-17 1975-03-26 Diamond Shamrock Corp Dimensionally stable asbestos diaphragms
US4489025A (en) * 1973-01-17 1984-12-18 Diamond Shamrock Chemicals Company Preparation of dimensionally stable asbestos diaphragms
US4701250A (en) * 1973-01-17 1987-10-20 Eltech Systems Corporation Dimensionally stable asbestos diaphragm coated foraminous cathode
US4210515A (en) * 1975-02-10 1980-07-01 Basf Wyandotte Corporation Thermoplastic fibers as separator or diaphragm in electrochemical cells
GB8526158D0 (en) * 1985-10-23 1985-11-27 Albright & Wilson Paper sizing compositions
US6866906B2 (en) 2000-01-26 2005-03-15 International Paper Company Cut resistant paper and paper articles and method for making same
RU2330911C2 (en) * 2002-09-13 2008-08-10 Интернэшнл Пейпер Компани Paper of improved rigidity and bulk and method to produce thereof
AU2006223142B2 (en) 2005-03-11 2011-04-07 International Paper Company Compositions containing expandable microspheres and an ionic compound, as well as methods of making and using the same
US8382945B2 (en) 2008-08-28 2013-02-26 International Paper Company Expandable microspheres and methods of making and using the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB572962A (en) * 1942-05-25 1945-10-31 Sylvania Ind Corp Paper products and methods of making the same
US2680995A (en) * 1950-12-01 1954-06-15 Stimson Lumber Company Method of making hardboard
US2962762A (en) * 1957-02-13 1960-12-06 Hoechst Ag Manufacture of non-woven two dimensional structures from fibers
US3049466A (en) * 1957-04-23 1962-08-14 Reeves Bros Inc Method of bonding fibrous structures made from fibers or filaments of polyolefine polymers
US3053609A (en) * 1958-11-17 1962-09-11 Du Pont Textile
US3096231A (en) * 1960-04-18 1963-07-02 Eastman Kodak Co Method of manufacturing paper from partially esterified cellulose fibers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB572962A (en) * 1942-05-25 1945-10-31 Sylvania Ind Corp Paper products and methods of making the same
US2680995A (en) * 1950-12-01 1954-06-15 Stimson Lumber Company Method of making hardboard
US2962762A (en) * 1957-02-13 1960-12-06 Hoechst Ag Manufacture of non-woven two dimensional structures from fibers
US3049466A (en) * 1957-04-23 1962-08-14 Reeves Bros Inc Method of bonding fibrous structures made from fibers or filaments of polyolefine polymers
US3053609A (en) * 1958-11-17 1962-09-11 Du Pont Textile
US3096231A (en) * 1960-04-18 1963-07-02 Eastman Kodak Co Method of manufacturing paper from partially esterified cellulose fibers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501431A (en) * 1966-11-25 1970-03-17 Us Air Force Sizing system for high modulus fibers and method and apparatus for applying same
FR2430652A1 (en) * 1978-07-04 1980-02-01 Comp Generale Electricite Synthetic paper for electrical insulation in oil - comprises nonwoven thermoplastic fibre sheet coated with lower melting polymer
US4425126A (en) 1979-12-28 1984-01-10 Johnson & Johnson Baby Products Company Fibrous material and method of making the same using thermoplastic synthetic wood pulp fibers
US4392861A (en) * 1980-10-14 1983-07-12 Johnson & Johnson Baby Products Company Two-ply fibrous facing material

Also Published As

Publication number Publication date
BE624231A (en)
GB1009120A (en) 1965-11-03
DE1229376B (en) 1966-11-24
DE1176994B (en) 1964-08-27
CH435965A (en) 1967-05-15
DE1176993B (en) 1964-08-27
DK115449B (en) 1969-10-06
US3200033A (en) 1965-08-10
NL6408415A (en) 1965-03-01
LU42620A1 (en) 1962-12-31
GB1044925A (en) 1966-10-05
NL285026A (en)
NL135829C (en)
LU46832A1 (en) 1964-10-26
DE1164818B (en) 1964-03-05
NL146235B (en) 1975-06-16
DE1159257B (en) 1963-12-12
BE652341A (en) 1964-12-16

Similar Documents

Publication Publication Date Title
US3227608A (en) Manufacture of synthetic paper sheet
US4293378A (en) Enhanced wet strength filter mats to separate particulates from fluids and/or coalesce entrained droplets from gases
US6103858A (en) Aqueous dispersion of a biodegradable polyester and its use thereof
US2811769A (en) Process for preparing an asphalt-bonded glass fiber mat
US3966867A (en) Manufacture of unique polyethylene terephthalate fiber
US3814578A (en) Treatment of textiles with glycidol-modified polyurethanes
JP7412566B2 (en) Wet-laid nonwoven fabrics and articles containing them
JPH06102880B2 (en) Method for manufacturing wet press felt cloth
DE1112041B (en) Process for coating or impregnating any type of substrate, especially textiles, with isocyanate polyaddition products
JPS58149922A (en) Manufacture of abrasive cloth or paper products
US3838561A (en) Unique polyethylene terephthalate fiber and yarn
US3401078A (en) Paper and process for making same of synthetic fibers bonded at their intercrossing points by a thermoplastic polyamide resin
GB2093051A (en) Aqueous polyurethane composition and method of preparing composite sheet material therefrom
JPS58174625A (en) Binder fiber
US4264645A (en) Process for improving the water vapor absorption capacity of textile substrates
US2124330A (en) Surfacing felted fibrous material
US3271237A (en) Process for the production of a fibrous polyamide laminar structure
US3828005A (en) Treatment of textiles with glycidolmodified polyurethanes
US3791849A (en) Process for the manufacture of a chemically bondedtextile sheet material based on synthetic fibers and having a high water vapor absorption capacity
US3441472A (en) Method of forming glass-asbestos water-laid sheet
DE4328800A1 (en) Low-pill and flame-retardant modified polyester, process for their production and structures formed therefrom
US2173129A (en) Coated and impregnated paper and process of manufacture thereof
US3619337A (en) Dimensionally stable fabric having a suedelike texture
AT258108B (en) Process for the production of paper and non-woven fabrics on conventional paper machines
US1944907A (en) Impregnated paper product