Classifications

• • C—CHEMISTRY; METALLURGY
  • C14—SKINS; HIDES; PELTS; LEATHER
  • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
  • C14C11/00—Surface finishing of leather
  • C14C11/003—Surface finishing of leather using macromolecular compounds

Definitions

• the invention relates to a process for improving the primer for leather finishes and the use of amino-containing polyacrylates as primers for leather finishes.
• leather finishing is the protective layer that is applied to the leather that has been dried after tanning and greasing in order to protect it against moisture, dirt and damage.
• optimal dressing is required to adhere well to the leather.
• precisely this requirement is not satisfactorily met by many dressing systems (see "Das Leder" 27 142-151 (1976)).
• Another problem with hydrophobized leathers is that an improvement in the adhesion is often associated with a deterioration in the hydrophobization.
• the object underlying the invention is therefore to improve the primer for leather finishes.
• the invention accordingly relates to a process for improving the primer for leather finishes, which is characterized in that leather is prepared by copolymerization of polyacrylates containing amino groups before the primer and / or in the primer liquor A) amino group-containing monomers of the general formula I.
• radicals R1 and R2 are hydrogen or methyl groups
• radicals R3 and R4 are hydrogen or alkyl groups having 1 to 4 carbon atoms or together with the nitrogen atom form a piperazine, piperidine or morpholine ring
• Z is an oxygen atom or one NH group
• Polyacrylates containing amino groups which can be prepared by copolymerization of dimethylaminoethyl methacrylate and butyl acrylate are particularly preferred.
• the copolymerization of the amino group-containing polyacrylates is carried out by known polymerization processes in aqueous media which, if desired, contain water-miscible solvents, such as alcohols, for example isopropanol (Ullmanns Encyclopedia of Industrial Chemistry, 4th edition, vol. 19, p. 3 - 4, Verlag Chemie Weinheim 1980).
• a radical-forming substance such as potassium or ammonium peroxide sulfate, tert-butyl hydroperoxide, azobis (cyanopentanoic acid), azoisobutyronitrile or 2,2- ⁇ azobis (2-amidinopropane dihydrochloride) is added in small quantities.
• the polymerization of the monomers is preferably carried out in such a way that monomers containing amino groups and monomeric esters are simultaneously dripped into water which contains the starter.
• the polymerization temperature can vary within a wide range. Depending on the starter used, temperatures between 60 and 100 ° C can be optimal.
• the amino group-containing polyacrylates which can be used as adhesion promoters are soluble in water in neutralized state or are present in hydrosolvated form.
• the copolymerizations are preferably carried out with 5 to 80% by weight of monomers containing amino groups and 95 to 20% by weight of monomeric esters, particularly preferably with 30 to 60% by weight of monomers containing amino groups and 70 to 40% by weight of monomeric esters.
• the adhesive base liquors preferably contain 5 to 50% by weight of the amino group-containing polyacrylates characterized above. It is possible to use the amino group-containing polyacrylates obtainable by copolymerization as such or after dilution with water and / or organic solvents, for example isopropanol, butanol, glycol ethers and / or methyl ethyl ketone, in the adhesive base liquors.
• the adhesive base liquors can be silicone emulsions or solutions, emulsifiers, for example nonionic surfactants, such as ethoxylated fatty alcohols and ethoxylated alkylphenols, if desired in combination with anionic surfactants, such as alkyl alcohol polyoxyalkyl phosphates and sulfates, and / or Wax dispersions are added.
• emulsifiers for example nonionic surfactants, such as ethoxylated fatty alcohols and ethoxylated alkylphenols, if desired in combination with anionic surfactants, such as alkyl alcohol polyoxyalkyl phosphates and sulfates, and / or Wax dispersions are added.
• the primer can be dyed with dye solutions or pigment preparations.
• the adhesive base liquors are applied to leather using spray, plush, casting or roller application processes.
• the proportion of polyacrylates containing amino groups in the base liquor is between 1 and 10 parts by weight, preferably between 3 and 6 parts by weight, based in each case on 100 parts by weight of binder in the base liquor.
• the amino group-containing polyacrylates to be used according to the invention form on leather a significantly improved primer for the subsequent finishing processes.
• a very good primer is formed on hydrophobized leather without negatively influencing the hydrophobization.
• Parts by weight means parts by weight

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Treatment And Processing Of Natural Fur Or Leather (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Adhesives Or Adhesive Processes (AREA)

Applications Claiming Priority (2)

Publications (2)

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Citations (3)

• 1988
  • 1988-05-11 DE DE3816103A patent/DE3816103A1/de not_active Withdrawn
• 1989
  • 1989-05-03 TR TR89/0377A patent/TR24626A/xx unknown
  • 1989-05-05 EP EP19890108082 patent/EP0341578A3/fr not_active Withdrawn
  • 1989-05-10 BR BR898902192A patent/BR8902192A/pt unknown
  • 1989-05-10 US US07/350,055 patent/US4946471A/en not_active Expired - Fee Related
  • 1989-05-11 JP JP1118504A patent/JPH0218500A/ja active Pending

Patent Citations (3)

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