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1. 发明专利

GB1012644A Urethane polymers and methods of applying compositions containing the polymers 未知
公开(公告)号：GB1012644A
公开(公告)日：1965-12-08
申请号：GB2949062
申请日：1962-07-31
申请人： LANKRO CHEM LTD , EDWIN FENTON CHANDLEY , ERNEST LEVY , ARNOLD JOHN LOWE
发明人： CHANDLEY EDWIN FENTON , LEVY ERNEST , LOWE ARNOLD JOHN
IPC分类号： C08G18/28 , C14C9/00 , C14C11/00
摘要： A polyurethane is prepared by the reaction of a stoichiometric excess of a di- or higher functional organic isocyanate with a mixture of one or more monohydric alcohols and one or more polyoxyalkylene polyols which contain more than two hydroxyl groups. The polyol is preferably a triol and preferably prepared from propylene oxide and a trihydric alcohol, e.g. glycerol, trimethanol propane, hexane triol. The monohydric alcohols may be represented by the formula R(OCnH2n)yOH where R is a hydrocarbon radical, n may be 2, 3 or 4, and y may be 0 or an integer between 1 and 50. Compounds mentioned are the condensation products of ethylene oxide with cetyl-oleyl alcohol and ethylene oxide with nonyl phenol. The isocyanate may be aromatic or aliphatic. The mixture of alcohols may also contain a polyoxyalkylene diol which may be the reaction product of propylene oxide with water or a dihydric alcohol, e.g. propylene glycol and preferably has a M.W. of 1000-3000. The polyurethane may be dissolved in a solvent, e.g. an ester, ketone or hydrocarbon fraction and used for coating leather. Up to 100% of raw oil, e.g. cold test neatsfoot oil or sperm oil may be incorporated in the solution. In Example (1) a mixture of glycerol based polyoxypropylene triol, cetyl-oleyl alcohol and polyoxypropylene diol were reacted with tolylene diisocyanate and the polymer dissolved in Shellsol "A." In other examples, the monohydric alcohols used were (1B) condensate of nonyl phenol and ethylene oxide, (1C) anhydrous butanol, (2) cetyl-oleyl alcohol, (11) a butoxy polyoxypropylene monohydric alcohol.ALSO:A solution of a polyurethane in an aromatic hydrocarbon fraction, ketone or carboxylic ester is applied to leather, said polyurethane having been prepared by reacting a mixture of one or more monohydric alcohols and one or more polyoxyalkylene polyols which contain more than two hydroxyl groups with a stoichiometric excess of a di or higher functional organic isocyanate. The urethane solution may be applied by a paint roller or by spraying or padding. Leathers mentioned are: shoe upper leather, full chrome goatskin, pigskin, sheepskin, upholstery and case leathers. In a typical example (II) a mixture of a polyoxypropylene triol and a butoxy polyoxypropylene monohydric alcohol were reacted with toluene diisocyanate in shellsol "A" and the polymer solution appled by spraying to the grain side of chrome upper shoe leather, the solvent allowed to evaporate and the treated leather finished by coating with a pigment and an acrylic resin emulsion followed by a spray coat of nitrocellulose emulsion and finally by a tinted spray coat of high flash nitrocellulose lacquer.

2. 发明专利

FR522301A 未知
公开(公告)号：FR522301A
公开(公告)日：1921-07-29
申请号：FR522301D
申请日：1920-08-11
申请人： ERNEST LEVY DEL PORTO
发明人： PORTO ERNEST LEVY DEL
IPC分类号： A45D34/02 , B65D39/00

3. 发明专利

GB568182A Improvements relating to the treatment of skin and leather materials 未知
公开(公告)号：GB568182A
公开(公告)日：1945-03-22
申请号：GB636843
申请日：1943-04-21
申请人： ANDREW VIGODNY , BRUNO HERDAN , ERNEST LEVY
IPC分类号： C09H1/04
摘要： 568,182. De-tanning leather. VIGODNY, A., HERDAN, B., and LEVY, E. April 21, 1943, No. 6368. [Class 76] In the treatment of chrome tanned leather materials or waste alternately with acid and alkali liquors as a preliminary to the extraction of glue or gelatine, the acid liquors are such as to lower the pH of the materials distinctly below 3, or more preferably below 2, and contain a soluble salt such as sodium chloride, sodium sulphate, or magnesium chloride, or soluble non-electrolytes such as sugar, or mixtures of these substances, in order to lessen the swelling of the leather materials under acid conditions. Examples describe the use of suspensions of lime or barium hydroxide (the pH of the bath being kept above 11 and preferably above 12), solutions of sodium carbonate or sodium hydroxide, and sulphuric and hydrochloric acids. Reference is also made to the use of strontium hydroxide, caustic alkali, soda ash, formic, lactic, citric, tartaric acids and sodium bisulphate. After acid treatment, the material may be washed with water or a solution of the substances specified above for addition to the acid bath. After alkaline treatment, washing may be carried out with water or, especially when a sparingly soluble base has been used, with salts of weak bases, e.g. ammonium chloride, or with acids, e.g. boric acid. or with mixtures of these substances, the pH not being allowed to drop substantially below 5. Neutralization of the material with milk of lime, sodium carbonate solution, a suspension of barium carbonate, caustic alkali or ammonia may follow a final acid treatment. A treatment may also be given with solutions or suspensions of soluble carbonates, barium carbonate, barium hydroxide, or soluble barium compounds such as the chloride in order to convert calcium sulphate into calcium carbonate or barium sulphate and prevent it being carried forward into the glue or gelatine. Reference is also made to treating the material, before soaking in acid and alkali, by washing with water, which may be hot, or with a solution of ammonia or sodium bicarbonate. A wetting agent, e.g. a sulphonated oil or a sulphonated fatty alcohol, may be added at this stage. The Provisional Specification is not limited to the treatment of chrome tanned leather, and describes the process as applied to skin and leather materials in general.

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