GB1185375A - The Treatment of Flexible Fibrous Porous Sheets - Google Patents

Abstract

1,185,375. Coated sheet material. MINNESOTA MINING & MFG. CO. 14 April, 1967 [15 April, 1966; 12 Dec., 1966], No. 17298/67. Heading B2E. [Also in Divisions C6 and D1] A flexible, fibrous porous sheet is impregnated or coated with (a) a polyether polyprimary amine having a M.W. of at least 1000 and having a primary amino terminal group attached directly to each end of a polyether moiety containing recurring groups of which at least a major portion consists of oxytetramethylene recurring units and at most a minor portion consists of oxyalkylene (other than oxytetramethylene) or thioalkylene recurring units having from 2 to 6 straight chain carbon atoms, at least one half of said primary amino terminal groups having the structure -OC 4 H 8 NH 2 , said polyether moiety having less than 3% by weight secondary amino nitrogen atoms and less than 0.3% by weight tertiary amino nitrogen atoms and (b) at least one epoxy resin having an oxirane equivalence greater than 1, the oxirane active hydrogen equivalence ratio being between 1/1 and 20/1. The term "oxirane/active hydrogen equivalence ratio" means the number of oxirane equivalents in the total epoxy resin to the number of amino-attached active hydrogen equivalents in the total weight of the polyether amine. The components (a) and (b) with or without an epoxy curing agent and solvent may be applied to the sheet and cured or the components (a) and (b) may be partially reacted, mixed with an epoxy catalyst and solvent and applied to the sheet and completely cured. The polyamine may be poly (tetramethylene oxide) diprimary amine prepared from tetrahydrofuran. The polyamine may be prepared from tetrahydrofuran and other cyclic ethers or thioethers (e.g. oxacycloheptane, 3,3-bis (chloromethyl) oxacyclobutane; phenyl glycidyl ether, propylene oxide, ethylene sulphide, epichlorohydrin and 2-methyl tetrahydrofuran). The epoxy resin may be a polyepoxide with or without a monoepoxide. The epoxy resin may comprise diglycidyl ether of bisphenol A or 1,4 butane diol, butyl glycidyl ether phenyl glycidyl ether, allyl glycidyl ether and glycidyl ether of m-pentadecenylphenol. The sheet may be leather, polyurethane sheet/polyester fibre web laminate, a sheet comprising polyurethane and nylon and leather fibres, cotton twill cloth or a sheet comprising nylon and polypropylene fibres and polyurethane. The compositions may comprise acrylic polymers, polyurethanes, leather fibres, lanolin, petroleum jelly, wood flour, corn cob dust, carbon black, cork and iron oxide. The sheet may be treated with polyurethane, acrylic resin, nitrocellulose or flock prior to or after treatment with the components (a) and (b).