Patent EP-2062926-A1 (EP)
Inventor: BURCKHARDT URS
IPC: C08G18/12
Filed: 2007-11-21
Abstract: Polyurethane polymers (P) with at least one urea group, in which (A) the urea group is disubstituted and the nitrogen atom from the prim. amino group (rather than that from the isocyanate group) is directly attached to a tert. carbon atom, and/or (B) the urea group is trisubstituted and the N atom from the sec. amino group (rather than that from the NCO group) is directly attached to a sec. or tert. carbon. Independent claims are included for (1) a composition (CN) for the production of (P), comprising (i) polyisocyanate(s), (ii) polyol(s) and (iii) diamine(s) of formula (III) and/or dienamine(s) (V) and/or di-imine(s) (VI) and/or iminoenamine(s) (XVIII) (2) a method (M1) for glueing substrates S1 and S2 together by (a1) applying the composition (CN) to S1 and/or S2, (b1)bringing S1 and S2 into contact and (c1) hardening CN, preferably with water (3) a method (M2) for glueing S1 and S2 together by (a2) applying CN to S1 and/or S2, (b2) hardening CN, preferably with water, (c2) heating the hardened CN on S1 and/or S2 to 100-200[deg] C, (d2) bringing S1 and S2 together and (e2) cooling and hardening the CN (4) a method (M3) for breaking the adhesive bond produced in M1 or M2 between S1 and S2, by (a3) heating the hardened CN to 100-200[deg] C and (b3) separating S1 from S2 (5) a method (M4) for sticking S1 and S2 together after breaking the bond as in M3, by (a4) heating the hardened CN on S1 and/or S2 to 100-200[deg] C, (b4) contacting S1 and/or S2 and/or S3 and (c4) cooling and hardening the CN (S1, S2 and S3 may be the same or different) (6) a method (M5) for sealing or coating, by (a5) applying the CN to S1 and/or S2 and (b5) hardening the CN, preferably with water (7) a method (M6) for removing a seal or coating obtained as in M5, by (a6) heating the CN to 100-200[deg] C and (b6) detaching the seal or coating from S1 and/or S2 (8) articles glued, unstuck, sealed or coated by the above methods (9) articles to which the CN has been applied as a round or triangular bead and at least partly hardened, especially with water. N a>, N b>nitrogen atoms; R 1>1-10C hydrocarbyl attached to N a>via a sec. or tert. carbon, or R 1>and R 2>together= 2-20C hydrocarbylene attached to N a>via a sec. or tert. carbon, in which case A is attached to N b>via a sec. or tert. carbon, or R 1>together with A forms a trivalent 5-30C hydrocarbon group attached to N a>and N b>via sec. or tert. carbon(s), with the proviso that the carbon attached to N b>is tert. if R 2>is H, or R 1>with A and R 2>= a tetravalent 8-30C hydrocarbon group attached to N a>and N b>via sec. or tert. carbon(s), or R 1>may be H, in which case A is a hydrocarbylene group attached to N a>via tert. carbon; R 2>as for R 1>, but with N b>instead of N a>and vice versa, and R 1>instead of R 2>in the combinations; A : 2-20C hydrocarbylene attached to N a>and N b>via a sec. or tert. carbon, where the carbon attached to N a>is tert. if R 1>is H and the carbon attached to Nb is tert. if R 2>is H, or A with R 1>or R 2>is a trivalent 5-30C hydrocarbon group with provisions as above, or A with R 1>and R 2>is a tetravalent 8-30C hydrocarbon group; R 11>-R 18>H or 1-34C hydrocarbyl, or paired as 4-20C hydrocarbylene forming part of a 5-8C carbocyclic ring (optionally substituted and/or containing hetero-atom(s)); The hydrocarbon groups in A, R 1>and R 2>=may contain hetero-atoms, but these are not in the alpha -position to N a>or N b>. [Image].