Patent GB-998205-A (GB)
Title: Heat-hardenable resinous compositions
IPC: C08L25/08
Filed: 1961-10-26
Abstract: Heat hardenable resinous compositions comprise (A) a copolymer of 1-40 weight per cent of allyl alcohol or an a -hydrocarbon substituted allyl alcohol with polymerizable monoethylenically unsaturated monomer, the copolymer including at least 30 weight per cent of copolymerized styrene or C1- 4 alkyl or halogen ring-substituted styrene or methyl methacrylate; and (B) an interpolymer of acrylamide or an a -hydrocarbon substituted acrylamide with at least one other polymerizable ethylenically unsaturated monomer, the amido hydrogen atom having been replaced by the group -ROR1 in which R is a saturated aliphatic hydrocarbon radical with its free valencies on a single carbon atom and R1 is hydrogen or C1- 8 alkyl.  The interpolymer may be derived from acrylamide or methacrylamide and vinyl aromatic compounds, acrylic and methacrylic esters, maleic acid, anhydride, monoesters or diesters, butene-2 and drying oils, such as dehydrated castor oil. The copolymer may be derived from allyl or methallyl alcohol, styrene or vinyl toluene, and optionally acrylic acid, acrylic or methacrylic esters, vinyl esters, vinyl ethers, vinyl or vinylidene halides or olefins. Examples describe the copolymerization of acrylamide with (1) styrene and ethyl acrylate, (3) styrene, ethyl acrylate and methyl methacrylate, (4) styrene and ethyl acrylate, (5) ethyl acrylate, 2-ethylhexyl acrylate and methyl methacrylate, (6) vinyl toluene and ethyl acrylate and (7) styrene, methyl acrylate and 2-ethylhexyl acrylate in the presence of catalysts, e.g. di-t-butylperoxide, benzoyl peroxide and cumene hydroperoxide; chain transfer agents, e.g. t-dodecyl mercaptan; and solvents, e.g. butanol, xylene and aromatic hydrocarbon mixtures; the copolymers being modified with formaldehyde and butanol.  Further examples describe enamels comprising the modified interpolymer of Example (1), titanium dioxide, and (12) a styrene-allyl alcohol copolymer, silica, magnesium silicate and butoxyethanol; or (13) a styrene/allyl alcohol/acrylic acid copolymer, butanol, xylene and phosphoric acid. The compositions may be used for coating metals.ALSO:Substrates, e.g. of metal, may be coated with heat hardenable resinous compositions comprising (A) a copolymer of 1-40 weight per cent of allyl alcohol or an a -hydrocarbon substituted allyl alcohol with polymerizable ethylenically unsaturated monomer, the copolymer including at least 30 weight per cent of styrene, a C1-4 alkyl or halogen ring substituted styrene or methyl methacrylate, and (B) an interpolymer of acrylamide or an a -hydrocarbon substituted acrylamide with at least one other polymerizable ethylenically unsaturated monomer, the amido hydrogen atoms having been replaced by -ROR1 where R is a saturated aliphatic radical with its free valencies on a single carbon atom and R1 is hydrogen or C1-8 alkyl. Preferred interpolymers are of acrylamide with styrene, vinyl toluene, ethyl acrylate, methyl acrylate, 2-ethylhexyl acrylate and/or methyl methacrylate, modified with formaldehyde and butanol.  Preferred copolymers are of allyl alcohol and styrene, with or without acrylic acid.  Examples describe the coating, e.g. by roller, of steel panels which may be "Bonderised" and aluminium strips with enamels comprising a copolymer of acrylamide, styrene and ethyl acrylate modified with formaldehyde and butanol, titanium dioxide, and (12) a copolymer of allyl alcohol and styrene, silica, magnesium silicate, and butoxyethanol; or (13) a copolymer of allyl alcohol, styrene and acrylic acid, butanol, xylene and phosphoric acid, the coatings being cured by heating in a gas-fired oven. p