| 摘要 |
1,244,689. Pressure sensitive adhesive tapes. NATIONAL STARCH & CHEMICAL CORP. 19 Dec., 1969 [6 Jan., 1969], No. 62057/69. Heading B2E. [Also in Division C3] Substrates are coated with a layer of a pressure sensitive adhesive composition comprising an organic solvent solution of (A) a copolymer containing (1) 0.5-10% by weight of units of an ethylenically unsaturated carboxylic acid and (2) units of at least one alkyl acrylate or methacrylate having up to 12 carbon atoms in the alkyl groups; said copolymer having a Williams plasticity value of 1.50-5.50 and being admixed in said solution with (B) 1-10% by weight (based on the copolymer) of a primary alkyl or alkenyl amine having at least 14 carbon atoms in the alkyl or alkenyl group. Specified as component (1) of the copolymer are acrylic, methacrylic, crotonic and itaconic acids, and the C 1 -C 4 alkyl half esters of maleic and fumaric acids. The copolymer may optionally contain units of other comonomers, e.g. vinyl esters such as vinyl acetate, vinyl ethers, vinyl and vinylidene halides such as vinyl chloride, unsaturated nitriles such as acrylonitrile, and anhydrides of unsaturated dicarboxylic acids such as maleic anhydride. Specified amines (B) are myristyl, cetyl, stearyl, oleyl and primary hydrogenated tallow amines. Suitable solvent components include methylene chloride, ethyl formate or acetate, methyl ethyl ketones, heptane, cyclohexane or toluene. The compositions may optionally include additives such as plasticisers, e.g. dioctyl phthalate, resins such as ester derivatives of rosin, fillers or pigments such as talc and clay, and hindered phenols. Suitable substrates include films derived from polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyethylene terephthalate, polystyrene or rubber hydrochloride, and backings derived from paper, paperboard, cloth, fibre glass, foamed plastics, regenerated cellulose and metal foils. The adhesive can be applied by coating techniques such as spraying, coating with air knife, trailing blade, knife coater or reverse roll, or by gravure coating; or by transfer from a release sheet. The coated substrates are particularly useful as removable, pressure sensitive labels, decals, tapes &c.
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