Polyurethane foams containing branched poly(trimethylene ether) polyols
View Patent ↗Disclosed is branched poly(trimethylene ether)polyols prepared from the acid catalyzed polycondensation reaction of 1,3-propanediol, and at least one triol comonomer selected from 1,1,1-tris(hydroxymethyl)ethane and 1,1,1-tris(hydroxymethyl)propane. Also disclosed is a branched poly(trimethylene ether)polyol with an equivalent hydroxyl functionality of about 2.1 to about 3.2 and a M n of about 200 to about 6000. The polyols are useful in the preparation of polyurethane rigid and flexible foams.
1. A polyurethane foam comprising a branched amorphous poly(trimethylene ether)polyol comprising repeating units of Formula I, Formula II, and Formula III
wherein R is methyl and Q is selected from Formula (IIIa) and (IIIb):
wherein m is 1-20 and n is 1 to 3, and further comprising end groups of Formula IV, V, and VI:
wherein the branched poly(trimethylene ether)polyol comprises the repeating units of Formula II and Formula III, together, at from about 2.8 mole percent to about 10 mole percent based on the branched poly(trimethylene ether)polyol, and wherein the branched poly(trimethylene ether)polyol is amorphous.
2. The polyurethane foam of claim 1 wherein the foam is flexible slabstock foam.
3. The polyurethane foam of claim 1 wherein the foam is rigid foam.
4. The polyurethane foam of claim 1 wherein the branched amorphous poly(trimethylene ether)polyol has Mn of about 200 to about 6000.
5. The polyurethane foam of claim 1 wherein the branched amorphous poly(trimethylene ether)polyol has Mn of about 250 to about 5000.
6. The polyurethane foam of claim 1 wherein the branched amorphous poly(trimethylene ether)polyol has an equivalent hydroxyl functionality of about 2.1 to about 3.2.