Patent ID: 9476539
Filing Date: 2016-10-25
CPC Classification: C08G,F16L

Claim Text:
1. A connection of at least two pipes or parts thereof having a connection region of the pipes adjoining the connection, wherein the connection region is enveloped by an open-celled rigid foam, wherein the rigid foam is a polyurethane foam comprising isocyanurate structures, and wherein the polyurethane foam is the reaction product of at least the following components: polyisocyanate (a) (ii) a composition (b), comprising: at least one polyol (b1) wherein a functionality of the at least one polyol is from 1.9 to 8 and a hydroxyl number of the at least one polyol is from 150 to 600 KOH/g; (iia) a catalyst (b2) at least comprising 0.2 to 0.8 wt. % of an amine and 0.02 to 0.3 wt. % of at least one trimerization catalyst (b2b) wherein the wt. % is based on the total weight of the composition (b): (iib) cell regulators (b3) (iic) chemical and/or physical blowing agents (b4); and (iid) optionally, crosslinkers (b5); and (iie) optionally, chain extenders (b6); wherein the open-celled rigid foam withstands an impact of 7 kJ in the DNV-RP-F111 rectangular hammer head impact test at a foam density of 120 kg/m wherein the open-celled rigid foam withstands an impact of 12 kJ in the DNV-RP-F111 rectangular hammer head impact test at a foam density of 160 kg/m