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    Process for the production of siloxanecoated separating paper
    9.
    发明授权
    Process for the production of siloxanecoated separating paper 失效
    生产硅胶分离纸的方法

    公开(公告)号：US3194680A

    公开(公告)日：1965-07-13

    申请号：US18721762

    申请日：1962-04-13

    Applicant: BAYER AG

    Inventor： KLAUS DAMM ,  HANS-ENGELBERT GOTTGENS

    IPC: C08K3/38 ,  C08K5/55 ,  C09J7/04

    CPC classification number: C08K5/55 ,  C08K3/38 ,  C09J7/401 ,  C09J2400/283 ,  C09J2483/005 ,  C08L83/04

    Abstract: A composition for coating paper (see Division B2) comprises, per 100 parts by weight of siloxane mixture, (1) from 1 to 70 pts. of a linear organopolysiloxane of the formula: wherein each R is H or a hydrocarbon radical and m has an average value of from 1.9 to 2.1, and also contains terminal OH groups bonded to Si; (2) from 99 to 30 pts. of a siloxane of the formula: wherein each R1 is a hydrocarbon radical and n has an average value of from 0.5 to 1.5; (3) from 0.1 to 10% by weight of the siloxanes of a curing catalyst, and (4) from 0.1 to 10% by weight of the siloxanes of a boron compound, e.g. boron oxide, boric acid, a boric acid alkyl ester, an alkyl-boric acid alkyl ester or a boroxole. Catalysts specified are carboxylates of Pb, Co, Zn, Mn, Zr, Ce and Sn; dibutyl-tin-dilaurate and -dimaleate; butyl- and dibutyl-amines; choline octoate and tetramethyl ammonium acetate; and benzoyl peroxide. The compositions may be used in the form of organic solvent solutions or aqueous emulsions. Examples are given.ALSO:A siloxane-coated separating paper is made by applying to the paper a mixture comprising, per 100 parts by weight of siloxane mixture, (1) from 1 to 70 parts of a linear organopolysiloxane of the formula , wherein each R is H or a hydrocarbon radical, and m has an average value of from 1,9 to 2,1, and also contains terminal Si-bonded OH groups; (2) from 99 to 30 parts of a siloxane of the formula , wherein each R1 is a hydrocarbon radical and n has an average value of from 0,5 to 1,5; and from 0,1 to 10% of the total weight of (1) and (2) each of (3) a curing catalyst and (4) a boron compound, (see Division C3), and subsequently heat curing the coating. The mixture may be applied as an organic solvent solution or as an aqueous emulsion. In a typical example (1) parchment, imitation parchment or soda kraft paper is dipped into the solution obtained (or the solution is poured over the paper) by dissolving in toluene a liquid a , o -dihydroxymethylphenylpolysiloxane, a methyl siloxane resin, propylboric acid di-n-amyl ester and dibutyl-tin-dilaurate, excess solution is removed by squeezing between rollers or allowing it to drip off, and the coated paper is then dried at 120-130 DEG C. for 2-3 minutes. The siloxane coating thus obtained is so flexible that the paper can be folded without damage.

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