Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
  • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
  • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
  • C08J2301/06—Cellulose hydrate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2489/00—Characterised by the use of proteins; Derivatives thereof
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
  • Y10T428/2813—Heat or solvent activated or sealable
  • Y10T428/283—Water activated
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
  • Y10T428/2852—Adhesive compositions

Definitions

• This invention relates to a means and method of minimizing the adhesionof contacting surfaces.
• the invention relates more particularly to preventing theharmful adhesion which occurs between sheets of thin, flexible, cellulosic material.
• Regenerated cellulose pellicles are used for wrapping articles, for the fabrication of envelopes and similar articles and for these, and. for other, purposes are sometimes cut into sheets and stored in piles. These sheets, having smooth surfaces, substantially uniform gauge, and marked flexibility, come into intimate contact when stacked. Where the stacks are high and heavy or where pressure is applied to the pile,
• the adhesion between sheets decreases the speed of handling the material in hand-wrapping, decreases the speed with which a wrapping machine can operate, interrupts the operation of automatic wrapping machines, and increases manufacturing costs.
• a general object of the invention is to minimize the tendency of objects to adhere to one another.
• the particular object of the invention is to produce pellicles of thin flexible material which have little tendency to adhere to one another.
• Another object of the invention is to provide a method by which the tendency of pellicles to adhere can-be substantially overcome.
• Other objects of the invention will be in part apparent and in part set forth in this specification.
• the objects of the invention are accomplished by applying to the pellicle an adhesive which is substantially imperceptible, non-tacky, and nonhygroscopic when dry.
• the objects of the invention are accomplished still. more particularly by the use of an adhesive of the protein class and by the specific substances and groups of substances herein disclosed.
• Example I A pellicle of regenerated cellulose is passed in the casting machine, after purification, through a bath containing the following materials and proportions:
• the pellicle is then dried.
• formalin givesoifvapors of formaldehyde which act together with the heat to convert the albumen into a non-hygroscopic coating which is very diflicultly soluble in water.
• the formalin can be left out of this composition, the hardening of the albumen being carried out by heat alone or by treatment with formaldehyde vapors.
• Example II About 11 parts by weight of casein are allowed to swell in about 44 parts by weight of water for at least thirty minutes. About one part by weight of ammonium hydroxide is then added, the temperature is slowly raised to about C. and about 44 parts by weight of water are stirred in, forming an emulsion of casein in water.
• This casein emulsion is made into a coating bath in the proportions of about 25 parts by weight of emulsion to about 4.5 parts by weight of glycerine and about 70.5 parts by weight of water.
• a cellulosic pellicle is run through this solution'at a speed which permits a treatment of from 20 to 60 seconds. Excellent results are obtained with the bath at any temperature around 25 C. to about C.
• The-pellicle is dried and is found to have a practically imperceptible non-hygroscopic coating which prevents adhesion.
• the hardening of the casein may be advanced by the assistance of formaldehyde, ammonium dichromate, or other tanning agents.
• Example III A sheet or film of undried regenerated cellulose or other cellulosic material is passed for approximately 20 seconds through a solution containing about 3 parts by weight of gelatine, about 4 parts by weight of glycerine, and about 93 parts by weight ofwater and is dried at a suitable temperature, for instance, at 95 or C. in 8. formaldehyde atmosphere.
• the glycerine may be eliminated in the ba where the character of the pellicle or coating does not require its presence.
• the invention has been described in its application to regenerated cellulose pellicles in the form of flat sheets, but it is to be understood that it is equally applicable to cellulosic pellicles in rolls or other forms, to pellicles of other composition than regenerated cellulose such as cellulose esters and cellulose ethers, and to materials not in pellicle form which exhibit a tendency to adhere.

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Laminated Bodies (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24489665

Family Applications (1)

Country Status (2)

Cited By (4)

• 1932
  • 1932-07-07 US US621315A patent/US2011246A/en not_active Expired - Lifetime
• 1933
  • 1933-01-09 FR FR748764D patent/FR748764A/fr not_active Expired

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