Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1982-03-10
1983-02-01
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 75, 528 77, C08G 1848
Patent
active
043716830
ABSTRACT:
The invention relates to a hardenable adhesive, which contains as effective components at least one polyol and one polyisocyanate and/or their prepolymers as well as additionally conventional additives, such as, accelerators, gluing auxiliaries, pigments and/or fillers. It is characteristic of the inventive adhesive that it contains, as a polyol, the reaction product of a novolak of average molecular weight from 300 to 1200 with an oxirane of the general formula ##STR1## in which R.sup.1 is hydrogen, or an optionally halogenated hydrocarbon group with 1 to 4 carbon atoms or the --CH.sub.2 OR.sup.2 group, in which R.sup.2 represents an alkyl or an alkenyl group, the R.sup.1 group within the polymeric molecule being the same or different, there being added, on the average, 1 to 7 moles of the oxirane per hydroxyl group of the novolak, and the polyol and the polyisocyanate being present in such a ratio that 0.95 to 1.25 isocyanate groups of the polyisocyanate correspond to one hydroxyl group of the polyol. The inventive adhesives are liquid, adhere well to plastic surfaces and have a high peel strength. They are resistant to the effects of water and moisture.
REFERENCES:
patent: 3686106 (1972-08-01), Tideswell et al.
patent: 3842036 (1974-10-01), Chow et al.
patent: 4107229 (1978-08-01), Tideswell
Ahrens Wilhelm
Fock Jurgen
Holtschmidt Ulrich
Schedlitzki Dietmar
Th. Goldschmidt Ag
Welsh Maurice J.
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