GB1305921A - - Google Patents

Abstract

1305921 Synthetic resins DR BECK & CO AG 16 Feb 1970 [14 Feb 1969] 7270/70 Headings C3P and C3R Solvent free isooyanate reaction resins are prepared by reacting, in the absence of water, a polyether having an equivalent weight of 60 to 2000 and a functionality of 2 to 6, a thixotropic agent, a compound which accelerates the reaction between OH and NCO groups, a polyisocyanate, a homopolymerizable and/or copolymerizable monomeric compound having a b.p. of 120‹ to 200‹ C., a polymerization initiator and a polymerization accelerator for the monomeric compound. Fillers, pigments, compounds increasing the electrical conductivity of the resin, compounds to remove traces of water and fireproofing agents may be included in the reaction mixture. Suitably the polyether has an equivalent weight of 100 to 500 and a functionality of 3 or 4. The thixotropic agent is preferably a high-dispersal silicic acid. The homo- or copolymerizable monomer may be a vinyl aromatic compound, e.g. styrene, a vinyl ester, e.g. vinyl esters of C 9-11 acids with a methyl branch at the α-carbon atom, acrylic esters, e.g hydroxypropyl acrylate and allyl esters. Conventional polyisocyanates are used. Organic peroxides from the ketone-peroxide, per-acid and per-ester groups are the preferred compounds to initiate polymerization. In a typical example a mixture is formed from a highdispersal silicic acid, a branched polyether, red iron oxide, dolomite, a zeolite, dimethyl-aniline, styrene, dibutyltindilaurate and a compound to adjust the conductivity and this mixture is mixed with a mixture comprising a commercial diphenylmethane diisocyanate mixture and dibenzoyl peroxide. The resins produced are capable of being electrostatically sprayed to form coatings.