Method for conditioning rubber surfaces and forming flexible resin coatings thereon and the articles produced thereby

• US 3,080,255 A
• Filed: 03/13/1959
• Issued: 03/05/1963
• Est. Priority Date: 03/13/1959
• Status: Expired due to Term

• Current Assignee: Herbert A. Winkelmann
• Original Assignee: Herbert A. Winkelmann
• Inventors: Winkelmann, Herbert A.
• Application Number:
  US03/799,077
• Time in Patent Office: 1,453 Days
• US Class Current: 428/413
• CPC Class Codes: B29K 2021/00 Use of unspecified rubbers as moulding material
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/40 High-molecular-weight compounds C08G18/2805 takes precedence
• CPC Class Codes: C08G 18/4202 Two or more polyesters of different physical or chemical nature C08G18/44 takes precedence
• CPC Class Codes: C08G 18/8029 Masked aromatic polyisocyanates
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31569 Next to natural rubber
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31826 Of natural rubber

Claims

3. A METHOD FOR FORMING A FLEXIBLE RESINOUS COATING ON A RUBBER SURFACE WHICH COMPRISES THE STEPS OF POLARIZING THE SAID RUBBER SURFACE BY CONTACTING THE SURFACE WITH AN AQUEOUS ACIDIC SOLUTION HAVING AN ACIDITY EQUIVALENT TO THAT RESULTING FROM THE PRESENCE THEREIN OF ABOUT 0.5% TO ABOUT 10% OF CONCENTRATED SULFURIC ACID, DRYING THE SAID SURFACE, AND THEREAFTER APPLYING TO SAID SURFACE A COMPOSITION COMPRISING 14% TO 19% POLYESTER RESIN, 11% TO 13% POLYFUNCTIONAL ISOCYANATE, 1% TO 3% LAMPBACK 2% TO 6% SILICA POWDER, 0.15%-04% CELLULOSE ACETATE BUTYRATE 0.25% TO 0.8% OF AN AMINE CURING AGENT 0.005% TO 0.03% OF A SMOOTHING AGENT SELECTED FROM THE GROUP CONSISTING TO CHLORO- AND FLUORO-SILANES HAVING 1-18 CARBON ATOMS, AND CHLORO- AND FLUROSILOXANE RESIN, 3% TO 5% LIQUID ISOCYANATE TERMINATED POLYEPOXY RESIN, 3% TO 5% LIWUID ISOCYANATE TERMINATED POLYURETHANE ELASTOMER, SAID ELASTOMER CONTAINING APPROXIMATELY 4% NCO BY WEIGHT AND HAVING A SPECIFIC GRAVITY OF 1.06, 1% TO 8% HYDROXY TERMINATED POLYURETHANE POLYMER FORMED BY THE REACTION BETWEEN A LINEAR POLYGLYCOL AND A DISOCYANATE, AND 42% TO ABOUT 51% SOLVENT FOR SAID RESINOUS INGREDIENTS, DRYING THE SAID COATING AND THEREAFTER BAKING THE COATED RUBBER ARTICLE AT A TEMPERATURE IN THE RANGE OF 265* F. 285* F. UNTIL THE RESINOUS INGREDENTS ARE CURVED.