Preparation of hard urethane foams

Details Preparation of hard urethane foams Preparation of hard urethane foams

C - Chemistry, Metallurgy

08

G

C08G 65/28 (2006.01) C08G 18/48 (2006.01) C08G 65/26 (2006.01) C08J 9/00 (2006.01)

Patent

CA 2042353

The present invention relates to a process for the preparation of a hard foam containing urethane groups or urethane and isocyanurate groups by the polyisocyanate polyaddition process, by reacting a) a polyoxypropylene- or polyoxyethylene-polyoxypropylene- polyol containing secondary hydroxyl groups, having a functionality of from 3.5 to 4.3, a hydroxyl number of from 350 to 650 and a viscosity of from 500 to 2,500 mPas at 23 °C and prepared by anionic polymerization of 1,2-propylene oxide or ethylene oxide and 1,2-propylene oxide onto an initiator molecule mixture containing, based on the total weight, a1) from 40 to 80% by weight of a hexanetetrol, a2) from 1 to 30% by weight of a hexanetriol, a3) from 0 to 35% by weight of glycerol and a4) from 0 to 15% by weight of sorbitol or mannitol, or a mixture thereof, b) optionally, a low-molecular-weight chain extender and/or crosslinking agent with c) an organic, modified or unmodified polyisocyanate; in the presence of d) a blowing agent, e) a catalyst and, optionally, f) assistants and/or additives, and novel polyoxypropylene-polyols and polyoxyethylene- polyoxypropylene-polyols which can be used for this purpose.

Affiliated with

Also associated with

Rating

Preparation of hard urethane foams does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Preparation of hard urethane foams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of hard urethane foams will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1428689