Pioneers of representation theory: Frobenius

1,241,499. Laminates. NATIONAL STARCH & CHEMICAL CORP. 18 July, 1969 [30 July, 1968], No. 36408/69. Heading B5N. [Also in Division C3] Laminates may be prepared with hot melt adhesive compositions comprising atactic polypropylene and an aliphatic petroleum hydrocarbon tackifying resin in a weight ratio of 1A8:1 to 9:1. The adhesives may be used for laminating paper and in the preparation of glass fibre reinforced gummed paper tapes by applying to adhesive coated paper web a roving of glass fibres and a further web of gummed paper. The adhesives may also comprise diluents, e.g. liquid polypropylene, paraffin wax, microcrystalline wax, polyethylene grease, hydrogenated animal, fish and vegetable fats; mineral oil, and Fischer-Tropsch waxes; stabilizers, e.g. hindered phenols and phosphites, pigments and fillers, e.g. titanium dioxide, clay and talc. Examples describe the preparation of two-ply paper laminates using adhesives comprising atactic polypropylene, aliphatic petroleum hydrocarbon resin and butylated hydroxytoluene, optionally together with (2C) paraffin wax, (2D) paraffin wax and talc, (2E) liquid polypropylene and octadecyl 3-(3,5-di-t.-butyl- 4-hydroxyphenyl) propionate and (2F) isotactic polypropylene and 3-(3,5-di-t.-butyl-4-hydroxyphenyl) propionate.