Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
  • C09J7/32—Water-activated adhesive, e.g. for gummed paper
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
  • C09J161/04—Condensation polymers of aldehydes or ketones with phenols only
  • C09J161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/21—Paper; Textile fabrics
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
  • C09J7/35—Heat-activated

Definitions

• This invention relates-to processes of making and utilizing sheeted adhesives and to products thus obtained; and it comprises as a new adhesive article a substantially dry, substantially homogeneous, thin flexible sheet of an alkaline con-- densation product of formaldehyde with a phenol, said sheet ordinarily containing a tenuousfiber reinforcement and said product being solid at ordinary temperature; becoming plastic and melt- I 0 ing when, warmed and setting to a hard permanent infusible form at temperatures somewhat above 100 0.; audit alsocomprises processes of making said adhesive articles and it further comprises methods of utilizing said new adhesive article and products so obtained; all as more fully hereinafter set forth and as claimed.
• the surfaces are treated with a solution, of glue 0 and setting performed under heat and pressure;
• the amount of water to be dissipated in the glue used may be as high as to per cent of the weight of the wood to be joined.
• the glue is applied toinner layers and the water is taken up by proximate 30 layers thereby necessarily swelling these.
• the product includes a.
• plywood and afiix veneers by employing between the layers of wood a cementing layer in the form of glue-surfaced sheets of paper, of fabric, or even of wood.
• suitable sheets are passed through a glue solution and afterwardsdricd so as to form adhesive surfaced sheets adapted to be interposed between the wood plies.
• adhesive surfaced sheets adapted to be interposed between the wood plies.
• This method while better, than the more common procedure of cementing by liquid glue directly applied is nevertheless open to certain objections.
• the viscosity of the product obtained depends upon the time of heating but is rather low in any event. The exact viscosity desired can be obtained by interrupting the heating and then cooling. Because of the solvent infiuence of the excess of alkali and of the water present, noseparation into two layers is produced.
• the oily liquid can be dried to a substantially dry material at temperatures below about 100 C. without going into the final insoluble resin. Ordinarily it is desired to dry the material to about 2 per cent water. By proper manipulation the dried material may be made in thin sheets.
• the sheets are made without the use of a reinforcement but for manufacturing reasons it is better to employ a tenuous reinforcement of fiber in negligible amount; an amount insufficient to produce a substantial intervening layer between the sheets of wood ultimately to be united.
• As'this'reinforcement we employ an open textured, thin paper, or like sheeted material. With the aid of this paper it is possible to produce the present material by ordinary manufacturing operation in a continuous manner; a web of paper passing first through the initial condensation product,'past equalizing rolls .and then through drying apparatus. Drying is usually so conducted as to give about 2 per cent water in the dry material and sufficient exposure to air is then permitted to allow assumption of the full amount of water of condition; usually about 8 per cent.
• the proportion of fiber to adhesive varies but is usually in about the ratio of 1 2. With thin open textured'pa'per in this proportion the final sheeted product has a substantially continuous body of adhesive.
• the thickness and porosit'yor open texture of the reinforcing sheet are so correlated with the liquidity or'yiscosity of the oily liquid condensation product containing caustic soda as to insure a-complete, continuous and uniform impregnation.
• the fiexible sheeted adhesive (with or without reinforcement) is placed between two layers of wood in the usual way of aflixing veneersor making plywood and heat and pressure are applied, the adhesiveat first yields and softens. then fuses and is then taken up for the most part by the pores of the wood; finally solidifying in place. With about '8 percent water in tlie material on fusing it forms afairly mobile liquid readily taken up by pores as a whole; there without much change in volume and with very little extrication of water; not enough to cause swelling or require any special care in subsequent drying.
• the adhesive sheets of the present invention are advantageous in manyother relations and may beused for general cementing purpose. Their use in forming a. facing layer on various articles is advantageous.
• adhesive papers for plywood manufacture comprising a porous open textured tissue paper sheet impregnated with an initial condensation product of an aldehyde with a phenol, said condensation product containing a. substantial amount of alkali, being capable of softening and fusing under heat and pressure to give a mobile liquid, being capable of hardening under said heat and pressure to give a hardened insoluble body, and having been produced at low temperatures in a dilute causticalkali solution without separation of an aqueous layer.
• adhesive papers for plywood manufacture comprising a porous open textured thin tissue paper sheet impregnated with a. low temperature, initial condensation product of an aldehyde with a phenol, caustic soda, and a small amount of water fixed as water of condition, said water being about 8 per cent of the total adhesive, the ratio of said condensation product to the paper being about 2:1.
• a process of making adhesive papers for plywood manufacture which comprises heating formaldehyde with a phenol in an aqueous solution of caustic alkali under conditions suitable for producing a homogeneous, easy flowing, oily in itial condensation product without the separation of an aqueous'layer, impregnating a porous, open textured tissue paper sheet with said product without the presence of extraneous solvents and drying to produce a non-tacky surface.
• an adhesive sheetlfor plywood manufacture comprising a porous, open textured, tissue paper sheet impregnated with an initial condensation product of an aldehyde with a phenol, formed without separation of an aqueous layer and in the presence of a caustic soda solution, and containing a small amount of water fixed as a water of condition, said water being about 5 to 8 per cent of the total adhesive; the said condensation'product being free from extraneous solvents, being capable of assuming a highly fluid state under heat and pressure at temperatures not substantially above 130 C. and, when placed between sheets of plywood and subjected to heat and pressure, being capable of fusing to form a mobile liquid and then hardening in situ to unite said sheets with a hard, insoluble bond.
• an adhesive sheet for plywood manufacture comprising a porous, open textured, thin tissue paper sheet impregnated with a low-temperature, initial condensation product of an aldehyde with a phenol formed in the presence of a caustic alkali solution, the said condensation product being free from extraneous solvents, being capable of assuming a highly fluid state under heat and pressure at temperatures not substantially above 130 C. and, when placed between sheets of plywood and subjected to heat and pressure, being capable of fusing to form a mobile liquid and then hardening in situ to unite said sheets with a hard, insoluble bond.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Veneer Processing And Manufacture Of Plywood (AREA)

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7783124

Family Applications (1)

Country Status (2)

Cited By (15)

• 1930
  • 1930-01-22 SE SE30530A patent/SE81661C1/sv unknown
• 1931
  • 1931-06-02 US US541734A patent/US1960176A/en not_active Expired - Lifetime

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