DICHT- UND KLEBSTOFF.

摘要

One-component, moisture-cured sealant- and adhesive-material (I) comprises telechelic isocyanate pre-polymers (II), with plasticisers as required, and fillers, pigments, anti-ageing agents and catalysts. (II) are obtd. by reaction of excess di-or polyiusocyanates with branched polyesterpolyols (III), polyetherpolyols and OH-functional (meth)acrylate prepolymers, where (III) wither have formula HO-(A-O-C-B-C-O)m-A-OH (IV) or are graft polymers HO-(E-O-C-D-C-O)n-E-OH (V) of (meth)acrylates or vinyl cpds. on linear polyesterpolyols. m, n = 1-40; A, B = 2-20C aliphatic (opt. with in-chain ester-or O-gp.), 6-20C cycloaliphatic or 6-16C aromatic residue; A, B have at least 2 1-5C alkyl side gps., or A is a castor oil backbone or B = C-C bond or CH2 or a di- or tri-meric fatty acid backbone; D, E = linear 2-20C aliphatic residue (opt. with in-chain O); or D = C-C bond or CH2. (II) are mfd. by reaction of di- or polyisocyanates separately with (III) and the other two components, and mixing the prods. or by reaction with a mixt. of all three; OH-functional (meth)acrylate is mfd. in the presence of (V) with simultaneous grafting of side-gps.. (III) have mol. wt. 300-15,000 pref. 500-5000; the proportion of (II) based on (III) is 2-80 wt.% of total (II); when a polyol mixt. is used, it contains 2-80 wt.% (III).