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    Pressure sensitive thermosetting resinous adhesives and tapes
    11.
    发明授权
    Pressure sensitive thermosetting resinous adhesives and tapes 失效
    压敏热固性树脂粘合剂和胶带

    公开(公告)号：US3378630A

    公开(公告)日：1968-04-16

    申请号：US34027864

    申请日：1964-01-27

    Applicant: WESTINGHOUSE ELECTRIC CORP

    Inventor： MENDELSOHN MORRIS A ,  ROGERS JR DOW A

    IPC: C08G63/60 ,  C09J163/02 ,  C09J167/00 ,  C09J167/04 ,  C09J167/08 ,  H01B3/30 ,  H01B3/42 ,  H01B3/48 ,  H01B3/50

    CPC classification number: C09J167/00 ,  C08G63/60 ,  C08K5/0016 ,  C08K5/005 ,  C08L61/28 ,  C08L61/32 ,  C08L63/00 ,  C08L67/00 ,  C08L2666/14 ,  C09D161/28 ,  C09J7/21 ,  C09J7/35 ,  C09J163/00 ,  C09J2201/40 ,  C09J2400/263 ,  C09J2461/00 ,  C09J2463/00 ,  C09J2467/00 ,  H01B3/30 ,  H01B3/42 ,  H01B3/48 ,  H01B3/50 ,  Y10T428/2936 ,  C08L2666/22 ,  C08L2666/18

    Abstract: A thermosetting pressure-sensitive adhesive composition comprises a partially cross-linked saturated polyester resin, a butylated melamine-formaldehyde resin, an ethoxyline resin, a flexibilizer and an oxidation inhibitor. A solvent and/or a mineral filler may also be present. The polyester preferably comprises 65 to 85 weight per cent of the total resin mixture, and may be derived from a low molecular weight polyol, preferably a trihydric aliphatic alcohol, e.g. glycerol, butane triol, and trimethylolethane, a C7- 9 hydroxy derivative of benzoic acid, e.g. salicylic acid, a dicarboxylic acid, e.g. phthalic or iso- or terephthalic acid, and a dehydrated natural oil, e.g. dehydrated castor oil or soybean oil. The oil and part of the polyol may be pre-reacted, preferably in the presence of an initiator, e.g. Ca(OH)2, then condensed with the remaining starting materials, preferably in the presence of a condensation catalyst, e.g. isopropyl titanate. The remaining part of the resin mixture in the adhesive composition preferably comprises 3-8 weight per cent of the butylated melamine formaldehyde resin, 3-10 weight per cent of the ethoxyline resin, 3-7 weight per cent of flexibilizer, which is preferably an oil extender, e.g. castor oil or pine oil, and 1-4% of oxidation inhibitor. Suitable solvents and fillers are toluene and xylene, and iron oxide, magnesium oxide, aluminium oxide, silica, carbon black, calcium carbonate, and talc. In the examples a polyester is prepared from dehydrated castor oil, glycerol, salicylic acid and isophthalic acid in xylene i.p.o. Ca(OH)2 and isopropyl titanate. This polyester is milled with iron oxide, talc, pine oil, polymerized trimethyl dihydroquinoline and xylene, and then with an aromatic epoxy resin, castor oil and a butylated MF resin. The composition is used to dip-coat woven fibreglass tape to form a pressure-sensitive adhesive tape which may be used to insulate copper bars.ALSO:A pressure sensitive adhesive insulating tape is prepared by coating a tape with a composition comprising 65-85 wt. % of a partially cross-linked saturated oil-modified polyester resin, 3-8 wt. % of a butylated melamine formaldehyde resin, 3-8 wt. % of a flexibilizer, e.g. castor oil or pine oil, and 1-4 wt. % of an oxidation inhibitor. (see Division C3). In addition there may be present solvents, e.g. toluene and xylene, and fillers or pigments, e.g. iron oxide, aluminium oxide, magnesium oxide, silica, C black, CaCO3 and talc. In Examples a woven glass fibre tape is coated with a mixture of a glycerol/dehydrated castor oil/salicylic acid/isophthalic acid polyester milled with xylone, iron oxide, talc, pine oil, polymerized trimethyl dihydroquinoline, an epoxy resin, castor oil and a butylated MF resin.

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