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    Pressure-sensitive tapes of organo-siloxane
    125.
    发明授权
    Pressure-sensitive tapes of organo-siloxane 失效

    公开(公告)号：US2732318A

    公开(公告)日：1956-01-24

    申请号：US2732318D

    IPC: B32B27/00 ,  C09J7/02

    CPC classification number: B32B27/00 ,  C09J7/201 ,  C09J7/22 ,  C09J7/38 ,  C09J2483/00 ,  C09J2483/006 ,  Y10T428/2839 ,  Y10T428/2852

    Abstract: 782,005. Adhesive tapes. MIDLAND SILICONES, Ltd. Sept. 22, 1955 [Oct. 7, 1954], No. 27089/55. Drawings to Specification. Class 140. A pressure-sensitive adhesive tape comprises a flexible backing consisting essentially of an organopolysiloxane free from organic silicates, having on one side a coating of a silicone adhesive and on the other a dried coating of a titanium compound of general formula Ti(OR) 4 or an aliphatic hydrocarbon-soluble partial hydrolysate thereof in which R is an aliphatic hydrocarbon radical containing less than 13 carbon atoms, or a hydroxylated aliphatic hydrocarbon radical containing less than 13 carbon atoms and containing less than 4 hydroxyl groups. The backing materials specified are polymers, copolymers and mixtures of units of general formula R n SiO 4-n/3 where R may be methyl, ethyl, octadecyl, phenyl, anthovenyl, tolyl, xylyl, methyl naphthyl, benzyl, phenylethyl, cyclohexyl, cyclopentyl, vinyl, allyl, chloromethyl, difluorophenyl, bromophenylethyl, trifluorovinyl and ααα trifluoromethylphenyl radicals, and n has an average value of from 1 to 2.1. Fabrics such as glass cloth, asbestos cloth, cotton, nylon or other organic fabrics may be coated with the above silicone compounds, or the said compounds may be used above as the backing. The adhesives are silicone adhesives, such as those comprising: (1) 5 to 70 per cent by weight of a benzene soluble resinous copolymer of SiO 2 units and R 1 3 SiO¢ units, where R 1 is an alkyl radical containing less than 4 carbon atoms or a phenyl radical, and where the ratio of R 1 3 SiO¢ units to SiO 2 units is from 0.6: 1 to 0.9 to 1 inclusive; and (2) 30 to 95 per cent by weight of a dicyanopolysiloxane having general formula R 11 2 SiO where R 11 is methyl or phenyl, and having a viscosity of at least 1,000,000 c.s. at 25‹ C., at least 90 per cent of the total number of R 1 and R 11 radicals being alkyl radicals. Examples of the titanium compounds are tetramethyl titanate, tetraethyltitanate, tetradecyl titanate, octylene glycol titanate, tetra (2-ethyl hexyl) titanate, tetradodecyl titanate and tetraisopropyl titanate. Specifications 608,956, [Group IV (a)], and 740,573 are referred to.

    Pressure-sensitive adhesive tape
    127.
    发明授权
    Pressure-sensitive adhesive tape 失效

    公开(公告)号：US2548980A

    公开(公告)日：1951-04-17

    申请号：US64500746

    申请日：1946-02-01

    Applicant: MINNESOTA MINING & MFG

    Inventor： WALDO KELLGREN

    IPC: C09J7/04

    CPC classification number: C09J7/21 ,  C09J7/201 ,  C09J2201/606 ,  C09J2400/263 ,  C09J2400/283 ,  C09J2421/00 ,  C09J2461/005 ,  Y10T428/24455 ,  Y10T428/2843 ,  Y10T428/2857 ,  Y10T428/31786 ,  Y10T428/31833

    Abstract: Coating compositions comprise an alcohol-soluble urea-, thiourea- or melamine-aldehydemonohydric alcohol resin and a plasticizer therefor such as a castor oil-modified alkyd resin or heavy-bodied castor oil; optionally, ethyl cellulose, polyvinyl butyral, dipentamethylene thiuram tetrasulphide, fillers, e.g. zinc oxide, volatile solvents such as xylol, butanol, ethyl alcohol, pigments or dyes may be incorporated in the compositions. When the coating compositions are applied to fibrous sheet materials, the sheet material may be impregnated with a composition comprising one or more of the following resins: rosin, ester gum, polymerized rosin, zinc abietate, limed rosin, hydrogenated rosin, pentaerythritol abietate, coumarone-indene, hydrogenated coumarone - indene, depolymerized butadienestyrene copolymer, together with vulcanizing agents and accelerators such as zinc oxide, dipentamethylene or pentamethylene thiuram tetrasulphide, oil-soluble phenol-aldehyde resins, alkyl phenol sulphide dispersed in oleum spirits and tetramethyl-thiuram-disulphide. The depolymerized butadiene-styrene copolymers may be made by mixing the copolymer with p-hydroxy-phenyl-morpholine, zinc oxide and zinc xylyl mercaptan, and heating the mixture with steam under pressure. If desired, the zinc xylyl mercaptan may be replaced by phenol hydrazine. The castor oil-modified alkyd resin may be made by heating together (1) ethylene glycol, glycerine, castor oil and an addition product of a terpene and maleic anhydride; (2) ethylene glycol, phthalic anhydride, glycerine and castor oil. The compositions are used in the preparation of pressure-sensitive adhesive tapes.

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