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    • 6. 发明专利
    • COATED GLASS BOTTLES
    • CA971839A
    • 1975-07-29
    • CA157242
    • 1972-11-23
    • TAKEDA CHEMICAL INDUSTRIES LTDMITSUI POLYCHEMICALS LTD
    • TATSUMI TETSUJIROMIYAMOTO REIJIKANAYAMA HIKOYOSHIMATSUI YUTAKAKAZAMA SEIJITAKEMURA TADAO
    • B65D23/08C03C17/32C03C17/34C08G18/62
    • 1363360 Coated glass containers TAKEDA YAKUHIN KOGYO KK and MITSUI POLYCHEMICALS CO Ltd 10 Nov 1972 [24 Nov 1971] 52114/72 Heading B2E A glass container, especially a bottle, is coated first with an olefin copolymer containing OH and/or COOH groups in its molecule and then with a polyisocyanate or a mixture thereof with a polyol or a thermoplastic polyurethane. The olefin copolymer may be one containing repeating units of (a) -CH 2 -CHR 1 - where R 1 is H or C 1-2 alkyl, (b) -CH 2 -CR 2 X 1 where R 2 is H or CH 3 and X 1 is -OH, -COOH or -COO(CH 2 ) 1-3 OH and (c) -CH 2 -CR 2 X 2 - where X 3 is -OCOR 3 or -COOR 4 (in which R 3 and R 4 are C 1-4 alkyl) and usually has a melt index of 0.5 to 1000 g/10 min. It may particularly be a copolymer of a C 2-4 α-olefin with acrylic or methacrylic acid or a hydroxy -C 1-4 - alkyl acrylate or methacrylate or the hydrolysed product of a copolymer of a C 2-4 α-olefin and vinyl acetate, propionate or butyrate or a methacrylic or acrylic acid C 1-4 alkyl ester, the degree of hydrolysis being 5-100 mole per cent. If the copolymer contains -COOH groups, it may be in the metal salt (or ionomeric) state. The olefin copolymer is applied as a powder by fluidised bed or electrostatic techniques or as a solution by dipping. The polyisocyanate may be tolylene diisocyanate, w, w 1 -diisocyano dimethylbenzene, dicyclohexylmethane diisocyanate or w, w 1 - diisocyano dimethylcyclohexane, or a polyurethane polyisocyanate prepared by reacting an excess of one of these diisocyanates with a polyol containing 2-8 OH groups per molecule and having a molecular weight of 60 to 2000. The polyisocyanate or mixture thereof is applied as a solution by dipping. The coatings reduce the breakage of the bottles by impact without a decrease in transparency of the bottles.