C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
18/1104
C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/30 (2006.01) C08G 18/32 (2006.01) C08G 18/65 (2006.01)
Patent
CA 1308225
PROCESS FOR THE PRODUCTION OF ELASTOMERIC MOLDED ARTICLES BASED ON POLYISOCYANATE POLYADDITION PRODUCTS CONTAINING UREA GROUPS ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the production of elastomeric molded articles based on polyisocyanate polyaddition products containing urea groups by the reaction of a) a polyisocyanate component with b) compounds having a molecular weight of 500 to about 12,000 and containing at least two isocyanate reactive groups, c) water as chain lengthening agent and, optionally, d) organic compounds having a molecular weight of 60 to about 499 and containing at least two isocyanate reactive groups by the one-shot or prepolymer process, maintaining an isocyanate index of about 70 to 125, characterized in that (i) water is used in a quantity of at least 10 mole % per equivalent of isocyanate groups in component a) and (ii) the reaction mixture prepared from the components is filled into an open mold by the casting process, the quantity introduced amounting to a least 95% of the volume of the molded, and the mold is subse- quently tightly closed so that the carbon dioxide produced by the reaction between water and isocyanate is virtually unable to cause expansion of the reaction mixture. ted by the claims.
573499
Eiben Robert
Ganster Otto
Knipp Ulrich
Luckas Bruno
Ruprecht Hans-Dieter
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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