Aq. dispersion useful as contact adhesive - contg. e.g. acrylic] copolymer and vinylidene] chloride copolymer

    公开(公告)号:DE3920935A1

    公开(公告)日:1991-01-03

    申请号:DE3920935

    申请日:1989-06-27

    Applicant: BASF AG

    Abstract: An aq. dispersion is claimed which consists of (i) at least one resin (A) of Tg -55 to -10 deg.C and wt. ave. mol. wt. 200,000-1 million; and (ii) at least one resin (B) of Tg 0-30 deg.C, the wt. ratio (A):(B) being 95:5-10:90. Resin (A) consists of (a) 65-97 wt.% of vinyl acetate, vinyl propionate and/or acrylic ester of a 2-10C alkanol; (b) 0-30 wt.% acrylonitrile, styrene and/or methacrylic ester of a 1-5C alkanol; and (c) 0-5 wt.% of one or more 3-5C alpha, beta-mono ethylenically unsatd. mono- or di-basic acids or anhydrides, mono- or di-amides, alkali metal salts or (in the case of dibasic acids) 1-8C alkanol semi-esters of the acids. Resin (B) consists of (a) 75-93 wt.% vinylidene chloride; (b) 7-25 wt.% acrylonitrile and/or (meth)acrylic esters of 1-8C alkanols, opt. with up to 10 wt.% of such monomers being replaced by hydroxyethyl- or hydroxypropyl-acrylate; and (c) 0-5 wt.% of one or more of 3-5C alpha, beta-monoethylenically unsatd mono- or di-carboxylic acids or their mono- or diamides as well as 2-acrylamido-2-Me-propanesulphonic acid (2-AM Claimed prepn. of the aq. dispersion is by bringing together at least one dispersion contg. (A) with at least one dispersion contg. (B). USE/ADVANTAGE - Use of the aq. dispersion is claimed as a contact adhesive. Such adhesives have higher strength than those of EP-185465.

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