C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/72 (2006.01)
Patent
CA 2125155
- 1 - Process for the production of rigid foams containing urethane groups A b s t r a c t Rigid foams containing urethane groups and optionally isocyanurate groups are produced by the reaction of a) sump products containing isocyanate groups and having a tolylenediisocyanate content of less than 5 % b.w., preferably less than 200 ppm (weight) obtainable from A) distillation residues of tolylenediisocyanate production by mixing the distillation residues A) with B) polyisocyanates or polyisocyanate mixtures of the diphenylmethane series optionally modified with urethane and/or allophanate groups and having an isocyanate content of at least 15% by weight and working up of the mixture by distillation, the mixture being heated to temperatures from 190 to 250°C before or during the distillative working up, whereby the tolylene diisocyanate which is reversibly bound in distillation residue A) undergoes substantial substitution by polyisocyan- ate B), with b) compounds in the molecular weight range of from 400 to 10,000 having at least two isocyanate reactive hydrogen atoms in the presence of c) water and/or readily volatile organic substances as blowing agents and optionally in the presence of - 2 - d) compounds in the molecular weight range of from 32 to 399 having at least two isocyanate reactive hydrogen atoms and e) auxiliary agents and additives known per se.
Dietrich Werner
Heilig Gerhard
Kapps Manfred
Leyrer Ulrich
Nicola William J.
Aktiengesellschaft Bayer
Corporation Bayer
Swabey Ogilvy Renault
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