Surface sizing of paper with an acrylic copolymer where scum formation is minimized
Patent 4030970 Issued on June 21, 1977. Estimated Expiration Date: 
June 21, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 21, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2999038 3726822 3876452 3925328 InventorsAssigneeApplicationNo. 05/474544 filed on 05/30/1974US Classes:162/168.1, Polymerized unsaturated compound162/168.2, Nitrogen containing compound162/168.7, Ester type162/173, Hydrocarbon162/175, Carbohydrate162/177, Cellulose derivative (e.g., cellulose ester)162/180, Natural resin428/514Ester, halide or nitrile of addition polymerExaminersPrimary: Bashore, S. LeonAssistant: Smith, William F. Attorney, Agent or FirmForeign Application Priority Data1973-05-31 JAAbstractA process for surface sizing paper with a surface sizing composition, which comprises a copolymer of acrylic or methacrylic ester, alkali metal salts of acrylic or methacrylic acid, and acrylic or methacrylic acid, or ammonium or lower alkyl amine salts thereof, where substantially no scum forms in the press operation, even after 8 hours. | |
