US3793102A - Process for forming backed microporous sheet - Google Patents

Process for forming backed microporous sheet Download PDF

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Publication number
US3793102A
US3793102A US00288563A US3793102DA US3793102A US 3793102 A US3793102 A US 3793102A US 00288563 A US00288563 A US 00288563A US 3793102D A US3793102D A US 3793102DA US 3793102 A US3793102 A US 3793102A
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emulsion
layer
sheet
release
forming
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J Day
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DVSG Holding GmbH
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USM Corp
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Assigned to EMHART INDUSTRIES, INC. reassignment EMHART INDUSTRIES, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: EMHART ENTERPRISES CORP., A NJ CORP.
Assigned to TEXON FOOTWEAR INC., A CORP. OF DE reassignment TEXON FOOTWEAR INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EMHART INDUSTRIES, INC.
Assigned to EMHART HOLDINGS INC. reassignment EMHART HOLDINGS INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TEXON FOOTWEAR INC., A CORP OF DE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/30—Expanding the moulding material between endless belts or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • B29C67/202—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising elimination of a solid or a liquid ingredient
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres

Definitions

  • ABSTRACT Process for forming a microporous polyurethane body backed with fibrous sheet material in which process a body of an emulsion is prepared of which the discontinuous phase is a volatile non-solvent liquid and the continuous phase is a liquid polymeric material which sets through reaction to solid condition, the liquid emulsion is formed as a layer and reacted under conditions preserving the unifonnity of the emulsion to pressure flowable stage having a pre-gel structure which will prevent sinking in of a fibrous sheet material and fibrous sheet material is laid on the layer and pressed into engagement with it to cause the emulsion to adhere to 'the fibrous sheet and to conform to irregularities.
  • the reaction is continued to solidify the emulsion in firmly adherent relation to the fibrous sheet and the volatile liquid is removed from the solidified emulsion.
  • the patent also discloses procedure in which a layer of reactive emulsion is formed on a casting surface and a porous fibrous sheet is laid on the free surface of the layer while the layer is still in liquid condition before solidification through reaction.
  • conditions adjacent the surface of the layer may cause the surface to be less porous than other portions of the layer.
  • liquid reactive urethane emulsion is cast as a layer on a casting surface with the surface opposite the casting surface stabilized until development of limited gel structure and thereafter a fibrous sheet is laid on the surface of the still pressure flowable emulsion and pressed into intimate engagement with the emulsion.
  • FIG. 1 is a diagrammatic elevational view of an arrangement of apparatus suitable for practicing the invention
  • FIG. 2 is a fragmentary sectional elevational view taken on the line Il-II of FIG. 1 of a cast layer with casting surfaces and cover sheet as may be formed on the apparatus of FIG. 1;
  • FIG. 3 is a fragmentary sectional elevational view of a cast layer with casting surface and fibrous backing layer taken on the line III-Ill of FIG. 1;
  • Pores or passageways in a body of resilient polymeric material in the present process are secured by solidifying a reactive emulsion in which the dispersed phase is droplets of non-solvent liquid and the liquid continuous phase comprises reactive polymeric material, and removing the non-solvent liquid from the solidified con tinuous phase leaving the spaces previously occupied by the non-solvent liquid as pores and passageways.
  • Reactive emulsions for use in the present process may be similar to the formulae used in the earlier filed patent of McGarr, referred to above.
  • Forming the combined microporous layer and fibrous backing involves providing a layer of the emulsion on a casting surface, directly disposing a cover sheet on the layer, maintaining the layer under conditions which do not disrupt the layer of emulsion during an initial period in which the emulsion thickens through reaction to develop a preliminary gel structure and through cooling of the emulsion and, at this point, removing the cover sheet and pressing a fibrous sheet into intimate engagement with the layer. Thereafter, the reaction to solidify the emulsion in firmly adherent relation to the fiber sheet is carried out and the volatile liquid is removed from the solidified emulsion leaving a uniform microporous layer integrally united with the fibrous sheet backing.
  • polymeric reactants and nonsolvent organic liquid to be mixed and emulsified are introduced through inlets 10 into the mixer-emulsifier 12 where they are acted on by the agitating blades 14.
  • the resulting emulsion is discharged through nozzle 16 and deposited as a layer 18 on the casting surface 20.
  • the casting surface 20 is a release sheet supplied from a roll 22.
  • the release sheet casting surface 20 is moved, suitably on conveyor 24 or on a slip plate (not shown) beneath the nozzle 16 which deposits the emulsion on successive portions of the sur face.
  • suitable cooling means may be provided such as a chilled plate (not shown) beneath the sheet casting surface 20 carrying the layer 18 of emulsion,
  • a flexible cover sheet 26 from the roll 28 is laid down on the emulsion carried by the casting surface.
  • this is done by feeding the cover sheet 26 around the curved member 30 which brings the cover sheet in contact with the edge of the nozzle 16 so that in effect, the release sheet 20 and cover sheet 26 with edge strips 32 at the edges of the relesase sheet 20 constitute a continuation of the nozzle to provide back pressure across the nozzle proper and effectively to eliminate shear movement in the emulsion layer 18.
  • the nozzle 16 may be so designed that all portions of the emulsion have similar time and temperature histories at the time the emulsion leaves the nozzle proper and enters between spaced moving webs.
  • the contacting surface of the cover sheet 26 preferably carries or provides a material giving a low adhesion interface between cover sheet 26 and emulsion layer 18 to minimize separational stress when the cover sheet is later removed and to insure that the adhesion of the layer 18 to cover sheet 26 is less than its adhesion to casting surface 20.
  • the cover sheet may be wet with an inert liquid, non-solvent for the continuous phase of the emulsion. This may be one of the liquids useful as the discontinuous phase.
  • the cover sheet may be dusted with a powder not readily wet by the continuous phase or a gas or liquid interface may be interposed between the cover sheet 26 and the emulsion layer 18 as by using a permeable cover sheet and forcing the gas or liquid through the cover sheet.
  • the cover sheet need not move with the emulsion in this case.
  • the deposited emulsion is carried along undisturbed after leaving the nozzle with the surfaces of the emulsion layer 18 protected by the cover sheet 26, release sheet 20 and edge strips 32.
  • the cover strip 26 is then drawn up from the surface of the emulsion layer 18 around the roller 34 and is wound up on the roll 36.
  • the location of the roller 34 which draws the cover sheet 26 away from the layer 18 is determined by the requirement of maintaining back pressure to give proper flow characteristic to the nozzle and by the rate at which the emulsion thickens and reaches the preliminary gel stage allowing the cover sheet to be withdrawn without disruption of the layer 18.
  • the backer materials may be practically any fabric which does not have chemical activity which would interfere with theongoing action and which does not carry a surface active material which would influence the surface active balance of the emulsion. These materials include woven and nonwoven fabrics.
  • the nonwoven fabrics may be needle punched, knit stitched, impregnated or resin bonded.
  • the fabrics may be napped or unnapped.
  • a very useful material includes napped and sheared sateen but plain sateen, cotton drill and other weave knits may be used.
  • Backers have been made of rayon, polyester, polypropylene, nylon, cotton filaments and other fibers and combinations. It has been found desirable to pre-wet the backing material 38 with an inert liquid non-solvent for the continuous phase, e.g., liquids suitable for the disperse phase of the emulsion, before associating the backing material with the emulsion layer. This is done conventionally. by dipping the fabric in the liquidand passing it through a wringer prior to winding it into the roll 40. As shown in the drawing, the fibrous backing 38 from the roll 40 is fed around the. roller 42 which presses it against the surface of the emulsion layer 18 to form the assembly shown in FIG. 3.
  • an inert liquid non-solvent for the continuous phase e.g., liquids suitable for the disperse phase of the emulsion
  • the composite After the fibrous backing has been pressed onto the surface of the emulsion layer, the composite is carried along to allow the reaction to proceed to a point at which the structure of the emulsion layer 18 is stable and resistant to harm by handling. At this point, the composite of solidified emulsion layer 18 and fibrous backing 38 may be stripped from the release sheet 20 for further treatment such as curing and removal of the non-solvent liquid of the droplets.
  • Reactive materials for use in the solidifiable continuous phase are those for forming elastomeric polyurethane or polyurea reaction products, both of which are hereafter referred to as polyurethanes, and are selected on the basis of their ability to provide toughness, flexibility, hardness and other physical properties required in the final product.
  • the reactive material may be a one shot" mixture of an organic compound having at least two active hydrogens such as a polymeric polyol, e.g., polyalkylene ether polyol and/or polyester polyol with a reactive compound having at least two reactive -NCO groups, e.g., a polyisocyanate.
  • a prepolymer system in which an -NCO terminated reaction product of a polyol with excess polyisocyanate is combined with chain extenders which may be polyhydroxy or polyamine or amino alcohol compounds having at least two hydroxyl or amine groups providing active hydrogens for reaction with -NCO groups.
  • polyol material or prepolymers which at room temperature are solid or pasty.
  • pasty refers to consistency which may be very high viscosity or may be partially solid which is capable of permanent deformation or even flow under substantial pressure, but which does not allow rapid, effective intimate mixing with other reagents and with the non-solvent liquid component to form a free flowing liquid emulsion with ordinary mixing and emulsifying equipment such as a high shear propeller type mixer.
  • These materials offer the special advantage that cooling of the emulsion after formation into a layer helps to thicken the emulsion layer to aid in resisting distortion when the cover sheet 26 is removed.
  • Polyols useful in the one shot mixture or for forming the reactive prepolymer include substantially linear or only moderately branched polyether polyols, and substantially linear or moderately branched polyester polyols from the condensation of polybasic acids, e.g., adipic acid, sebacic acid, azelaic acid, dimerized linoleic acid and other aliphatic and aromatic dibasic acids with polyols such as butane diol, ethylene glycol, propylene glycol and the like.
  • Castol oil is also a suitable polyol for making a prepolymer.
  • Controlled portions of polyols or polybasic acids having more than two reactive -OH or -COOl-l groups may be included in l the compositions reactive to form polyester polyols to persed droplets until the coating at least partially solidi fies around the droplets and is removed thereafter leaving open spaces and pores. Removal is effected without expansion of the solidified body.
  • Suitable liquids may readily be selected by a chemist on the basis of the known physical properties of liquids. Any liquid having substantially non-solvency and non-reactivity with the polymeric material together with suitable volatility characteristics may be used.
  • liquid aliphatic hydrocarbons including petroleum hydrocarbon fractions, particularly those commercially available as mineral spirits, petroleum naphtha and kerosene which are largely or completely aliphatic in composition are generally preferred because of their low cost and satisfactory behavior in the composition; but other substantially inert organic liquids such as liquid alkyl ethers, e.g., amyl ether and dibutyl ether and liquid halogenated hydrocarbons, preferably halogenated aliphatic hydrocarbons such as chlorodecane, tetrachloroethylene and tctrachlorodifluoroethane may be used.
  • liquid alkyl ethers e.g., amyl ether and dibutyl ether
  • liquid halogenated hydrocarbons preferably halogenated aliphatic hydrocarbons such as chlorodecane, tetrachloroethylene and tctrachlorodifluoroethane may be used.
  • the pore-forming liquid is chosen to have a boiling point above the selected mixing and reaction temperatures and should preferably have a boiling point of at least about 100C. and preferably at least 130C. to allow use of temperatures giving a desirable fluidity and rate of reaction of the polymeric material.
  • the liquid will be chosen with low enough boiling point for removal without heat injury to the solidified body or to a base with which it may be associated.
  • the liquid should ordinarily not contain substantial quantities of high boiling or low volatility components, and preferably at least 90 percent of the components-should boil at temperatures below 232C. It is to be understood that other means than evaporation, e.'g., extraction may be used to remove high boiling or low volatility liquid and in such cases the upper limit of boiling point does not apply.
  • the extent of heating of the reactive polymeric material needed to bring the material to a suitably low viscosity, which may he of the order of 6,000 centipoises, for emulsion forming, depends on the properties of the material. Higher melting point and higher molecular weight reactive polymeric materials require higher temperatures. Polymeric materials giving the desired improvements in retention of uniform droplet distribution of the emulsion in layer form call for heating to a temperature of at least about 50C.
  • Dispersion of droplets of the pore-forming liquid in the heated liquid body of reactive polymeric material to form an emulsion in which the reactive polymeric material is the continuous phase is effected by vigorous agitation during the course of addition of the poreforming liquid to the body of polymeric material.
  • Surface active agents are useful to aid in dispersing the liquid in the polymeric material and to control the stability of the resulting emulsion.
  • Preferred emulsifying agents have included anionic and non-ionic surface active agents such as commercially available silicone emulsifiers, polyoxyalkylene ethers such as a commercial polypropoxy/polyethoxy ether, partial long chain fatty acid esters and the polyoxyalkylene derivatives of such esters, also sulfuric acid esters of long chain fatty alcohols, etc.
  • anionic and non-ionic surface active agents such as commercially available silicone emulsifiers, polyoxyalkylene ethers such as a commercial polypropoxy/polyethoxy ether, partial long chain fatty acid esters and the polyoxyalkylene derivatives of such esters, also sulfuric acid esters of long chain fatty alcohols, etc.
  • the amount of pore-forming liquid dispersed will vary with the desired porosity of the final product and may vary from as low as, based on parts by weight, 25 parts of the liquid to 100 parts of the polymer up to as high as 300 parts of the liquid to 100 parts of the polymer material. It is preferred to use from about 60 parts to about 200 parts of liquid to parts of the polymeric material. It is desirable that the mechanical conditions of dispersion of the liquid and the polymer be controlled to form very small droplet sizes of which the majority will be in the range of from 0.001 mm. to about 0.03 mm. in diameter.
  • Reaction of the polymeric material to higher molecular weight solid condition is brought about and controlled by the time and temperature conditions of bringing together of the reactive components and/or by the introduction of catalyst.
  • a polymeric polyol such as the polyester polyol or polyether polyol
  • mixing and emulsiflcation involves bringing together these materials together with the liquid to be dispersed and a catalyst effective to control the reaction rate.
  • an -NCO terminated prepolymer prepared from a polymeric polyol such as an hydroxyl terminated polyether or polyester and a polyisocyanate, the pore forming liquid, and chain extenders reactive with the prepolymer to give higher molecular weight materials are combined and emulsified, with the prepolymer material forming the continuous phase.
  • Chain extenders effective to increase the molecular weight of the prepolymer are compounds having two or more active hydrogen atoms such as p,p' methylenedianiline, 4,4'-methylene-bis-(2,- chloroaniline), trimethylolpropane, m-
  • Cover sheet 26 (see FIG. 1), which may be wet with an inert non-solvent liquid is laid down on the surface of the deposited emulsion layer 18 opposite the casting surface 20 as the layer is formed, or promptly after it is formed.
  • the cover may be a release sheet such as a paper sheet carrying a non-adhesive deposit for example, of silicone, polytetrafluoroethylene, polychlorotrifluoroethylene, wax, polyethylene or polypropylene or may be a non-adhesive supported or unsupported resin or elastomer sheet.
  • the cover cover sheet 26 is preferably flexible for convenience in handling and may be laid down on the emulsion layer 18 by hand or by any of the known devices for laying a sheet down smoothly on a surface.
  • the reaction of the polymeric material rapidly produces a preliminary gel structure in which the emulsion has sufficient stability that the stripping of the cover sheet does not disrupt of distort the surfaces of the emulsion from which it is stripped.
  • Control of the reaction to insure reaching the desired partial gellation by the time the cover sheet is stripped off may be controlled by such factors as temperature, catalyst and rate of speed of the conveyor.
  • the known catalysts for urethane reactions may be used. It has been found particularly desirable to use a catalyst having an induction period during which no important physical changes occur in the reaction mixture so that in the present process mixing and deposition as a layer 18 between the casting sheet 20 and the cover sheet 26 occurs before preliminary gellation has begun, while at the same time, once the induction period has passed, the catalyst is effective to complete the cure of the urethane in a minimum time.
  • the catalyst having an in-' duetion period there may be used mercuric salts of aliphatic and/or aromatic carboxylic acids.
  • This catalyst may be used in amount of from about 0.01 percent to about 0.4 percent, preferably about 0.10 percent by weight based on the weight of the resin.
  • Such catalyst may include triethylene diamine, N,N,NN tetramethylene butane diamine, dibutyl tin dilaurate, stannous octoate and lead naphthenate. These materials will ordinarily be used in proportion of from about 0.002 percent to about 0.7 percent by weight based on the weight of the resin.
  • Rapid catalyst such as a tin compound is believed to reduce the desparity between the rate of reaction of the isocyanate and the polyester or polyether polyol on the one hand and the rate of reaction between the isocyanate and the short chain diol modifier on the other hand and to give best product quality. Rapid catalysts are also effective to speed up the reaction between the isocyanate with hydroxyl terminated compounds so that the tendencies for the isocyanate to be extruded into the inert liquid of the discontinuous phase is reduced.
  • the rapid reaction also enables the cover sheet 26 to be removed in a very brief space and the combination of rapid catalyst and catalyst having an induction period operates so that the composite of fibrous backing sheet 38 and solidified emulsion layer 18 will reach a condition in which it can be handled in a minimum .time. It is to observed that the tin catalyst tends to give immediate action and that there is evidence that the mercury catalyst slows the action of the tin catalyst sothat time is available for forming the emulsion layer.
  • EXAMPLE 1 130 grams (0.0844 mols) of -NCO terminated prepolymer prepared by reaction of p,p-diphenyl methane diisocyanate and hydroxyl terminated polybutylene adipate in a mol ratio of 2: 1 resulting prepolymer having molecular weight of 1,540, and being solid at room temperature was liquefied and degassed at 100C. and mixed with 3.9 grams of an emulsifier defined as blended polypropoxy/polyethoxy ether having an hydroxyl number of which is a solid at C. and the mixture was'brought to atemperature of 100C. 148 cc. of a liquid, paraffinic hydrocarbon mixture (boiling range 346F.
  • the assembly was held in a closed condition which inhibited naphtha evaporation and was stripped from the casting sheet and held'in an oven at 100C. for 24 hours to complete curing of the layer and evaporation of the hydrocarbon layer of the composite sheet.
  • An excellent backed microporous polyurethane sheet material was obtained.
  • EXAMPLE 2 An emulsion of the prepolymer, emulsifier and liquid paraffinic hydrocarbon mixture, butane diol and surfactant was prepared as in Example 1 with the addition of a commercial tin catalyst for the reaction of isocyanate and hydroxyl in amount of 20 parts of catalyst per million parts of polyurethane and the emulsion was supplied at a temperature of 60C. between a casting sheet and a cover sheet as a layer about 0.02 inch in thickness. The emulsion layer, with the casting and cover sheets in place, was passed in contact with cooled aluminum plates maintain at a temperature of 45C. The cover sheet was stripped off after 15 seconds and the layer of emulsion was brought to C. for 1 minute.
  • a nonwoven polyester fiber sheet was laid on the exposed phase of the emulsion layer and the assembly was brought to 100C. Afte'r'8 minutes at 100C., the backer and solidified emulsion layer were stripped from the casting sheet and air dried at 100C. for 30 minutes. The resulting sheet was a fine microporous polyurethane backed sheet material.
  • Example 3 The procedure of Example 2 was repeated; but there was also included 1,500 parts per million of a mercury salt of a carboxylic acid as well as the tin catalyst.
  • the emulsion was supplied between the casting sheet and the cover sheet at a temperature of C. and the composite of casting sheet emulsion layer and cover sheet were passed betweencooled aluminum plates maintained at 35C. After 25 seconds the cover sheet was peeled off and the emulsion layer was brought to a temperature of C. After 4 minutes at this temperature a stitch bonded continuous filament polyester nonwoven fibric was laid on the emulsion layer. This assembly was held at 1 15C. for 5 minutes in a closed chamber which inhibited evaporation and was then stripped from the carrier sheet and pressed in an oven at 100C. for 25 minutes to evaporate the liquid hydrocarbon and complete the cure of the polyurethanefof the emulsion layer.
  • a microporous sheet of solid polyurethane comprising the steps-of casting an emulsion of fine droplets of a volatile organic liquid as the internal phase in a continuousphase comprising reactive material convertible through reaction to solidified, resilient, film-forming condition, said reactive material comprising a mixture of an organic compound providing at least two reactive -NCO groups per molecule and an organic compound having at least two active hydrogens per molecule for reaction with said -NCO groups, said organic liquid being substantially non-solvent for and non-reactive with said reactive material, being immiscible in said continuous phase and being present in amount from about 60 percent to about 300 percent by weight based on the weight of the reactive material, reacting said material at a temperature below the boiling point of said liquid so that the liquid never boils to cause the emulsion to gel and solidify with said droplets held in the solidified material and removing said liquid without expanding the solidified material leaving pores and discontinuities in the solidified material to constitute passageways for air and vapor, the improvement which comprises forming
  • Claim 1 first line, delete The and insert ...In the-- signed and sealed this 30th day of'July 1971+.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Laminated Bodies (AREA)
US00288563A 1972-09-13 1972-09-13 Process for forming backed microporous sheet Expired - Lifetime US3793102A (en)

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US28856372A 1972-09-13 1972-09-13

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US (1) US3793102A (de)
JP (1) JPS4964653A (de)
AU (1) AU6017773A (de)
BR (1) BR7307143D0 (de)
CA (1) CA1001909A (de)
DE (1) DE2343139A1 (de)
ES (1) ES418839A1 (de)
FR (1) FR2198837B1 (de)
GB (1) GB1439819A (de)
IT (1) IT995334B (de)
SU (1) SU537635A3 (de)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849226A (en) * 1971-08-26 1974-11-19 Delog Detag Flachglas Ag Producing fiber reinforced resin panels with gelcoat fiber layer and lacquer protective
US3856914A (en) * 1970-06-15 1974-12-24 Kinyosha Kk Method of making a porous polymeric material
US3964835A (en) * 1972-04-15 1976-06-22 Ludwig Eigenmann Device for forming marking stripes on road surfaces
US4083325A (en) * 1974-09-03 1978-04-11 General Dynamics Corporation Apparatus for continuously coating a large structure with a uniform foam layer
US4089296A (en) * 1975-12-09 1978-05-16 Congoleum Corporation Apparatus for spreading foam material
US4102719A (en) * 1975-12-20 1978-07-25 Dynic Corporation Process for producing artificial leather
WO1981000818A1 (en) * 1979-09-24 1981-04-02 Scott Paper Co Release coatings
US4311766A (en) * 1979-09-24 1982-01-19 Scott Paper Company Release coatings
US4327121A (en) * 1980-10-02 1982-04-27 Scott Paper Company Release coatings
US5401348A (en) * 1989-06-15 1995-03-28 Dai Nippon Insatsu Kabushiki Kaisha Soft coat film
US5665195A (en) * 1994-09-14 1997-09-09 International Business Machines Corporation Apparatus for forming cavities without using an insert
US6258441B1 (en) 1989-06-16 2001-07-10 Dai Nippon Insatsu Kabushiki Kaisha Soft coat film
US20100203319A1 (en) * 2009-02-10 2010-08-12 Keng-Hsien Lin Method Of Making A Breathable Film Laminate And A Breathable Film Laminate Produced Therefrom
US20110171389A1 (en) * 2005-05-31 2011-07-14 Aspen Aerogels, Inc. Solvent management methods for gel production
US20140120337A1 (en) * 2011-05-13 2014-05-01 Mas Research And Innovation (Pvt) Ltd. Method of Manufacturing a Fabric-Laminated Foam Article
CN112210882A (zh) * 2020-09-04 2021-01-12 广东五源新材料科技集团有限公司 基于动物皮革纤维束缠绕织物层的基布匀整方法
CN112210883A (zh) * 2020-09-04 2021-01-12 广东五源新材料科技集团有限公司 基于动物皮革纤维束缠绕织物层的基布、皮革和制造方法

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US3551364A (en) * 1965-10-21 1970-12-29 Usm Corp Processes for making microporous polyurethane bodies employing non-boiling liquid alkyl ethers or liquid aliphatic hydrocarbons
US3679783A (en) * 1969-10-16 1972-07-25 Usm Corp Improved process for forming a thin microporous sheet material

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Publication number Priority date Publication date Assignee Title
US3551364A (en) * 1965-10-21 1970-12-29 Usm Corp Processes for making microporous polyurethane bodies employing non-boiling liquid alkyl ethers or liquid aliphatic hydrocarbons
US3679783A (en) * 1969-10-16 1972-07-25 Usm Corp Improved process for forming a thin microporous sheet material

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3856914A (en) * 1970-06-15 1974-12-24 Kinyosha Kk Method of making a porous polymeric material
US3849226A (en) * 1971-08-26 1974-11-19 Delog Detag Flachglas Ag Producing fiber reinforced resin panels with gelcoat fiber layer and lacquer protective
US3964835A (en) * 1972-04-15 1976-06-22 Ludwig Eigenmann Device for forming marking stripes on road surfaces
US4083325A (en) * 1974-09-03 1978-04-11 General Dynamics Corporation Apparatus for continuously coating a large structure with a uniform foam layer
US4089296A (en) * 1975-12-09 1978-05-16 Congoleum Corporation Apparatus for spreading foam material
US4102719A (en) * 1975-12-20 1978-07-25 Dynic Corporation Process for producing artificial leather
WO1981000818A1 (en) * 1979-09-24 1981-04-02 Scott Paper Co Release coatings
US4311766A (en) * 1979-09-24 1982-01-19 Scott Paper Company Release coatings
US4327121A (en) * 1980-10-02 1982-04-27 Scott Paper Company Release coatings
US5401348A (en) * 1989-06-15 1995-03-28 Dai Nippon Insatsu Kabushiki Kaisha Soft coat film
US6258441B1 (en) 1989-06-16 2001-07-10 Dai Nippon Insatsu Kabushiki Kaisha Soft coat film
US5665195A (en) * 1994-09-14 1997-09-09 International Business Machines Corporation Apparatus for forming cavities without using an insert
US5772837A (en) * 1994-09-14 1998-06-30 International Business Machines Corporation Apparatus for forming cavities without using an insert
US20110171389A1 (en) * 2005-05-31 2011-07-14 Aspen Aerogels, Inc. Solvent management methods for gel production
US9476123B2 (en) * 2005-05-31 2016-10-25 Aspen Aerogels, Inc. Solvent management methods for gel production
US10590043B2 (en) 2005-05-31 2020-03-17 Aspen Aerogels, Inc. Solvent management methods for gel production
US11731909B2 (en) 2005-05-31 2023-08-22 Aspen Aerogels, Inc. Solvent management methods for gel production
US20100203319A1 (en) * 2009-02-10 2010-08-12 Keng-Hsien Lin Method Of Making A Breathable Film Laminate And A Breathable Film Laminate Produced Therefrom
US8105456B2 (en) * 2009-02-10 2012-01-31 Keng-Hsien Lin Method of making a breathable film laminate and a breathable film laminate produced therefrom
US20140120337A1 (en) * 2011-05-13 2014-05-01 Mas Research And Innovation (Pvt) Ltd. Method of Manufacturing a Fabric-Laminated Foam Article
CN112210882A (zh) * 2020-09-04 2021-01-12 广东五源新材料科技集团有限公司 基于动物皮革纤维束缠绕织物层的基布匀整方法
CN112210883A (zh) * 2020-09-04 2021-01-12 广东五源新材料科技集团有限公司 基于动物皮革纤维束缠绕织物层的基布、皮革和制造方法

Also Published As

Publication number Publication date
JPS4964653A (de) 1974-06-22
BR7307143D0 (pt) 1974-07-25
IT995334B (it) 1975-11-10
ES418839A1 (es) 1976-03-16
FR2198837A1 (de) 1974-04-05
GB1439819A (en) 1976-06-16
AU6017773A (en) 1975-03-13
CA1001909A (en) 1976-12-21
FR2198837B1 (de) 1977-05-20
DE2343139A1 (de) 1974-03-21
SU537635A3 (ru) 1976-11-30

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