US 9,809,674 B2 · High functional polyester polyols

Abstract

Aromatic polyester polyols with high functionality, moderate viscosity, and high aromatic content suitable as the sole polyol in the production of polyurethane foams without the use of any polyether polyols are disclosed. This unique combination of properties makes them suit for use as the sole polyol in the production of polyurethane foams. With reduction of flame retardants, these foams based on sole aromatic polyol can have E-84 class one fire properties. The aromatic polyester polyols of this invention are characterized as having a functionality of greater than 2.8 while having a moderate viscosity ranging from 4,000-10,000 cps @ 25 C. A typical high functional polyester polyol of the present invention has a hydroxyl number in the range of 320-400, viscosity of 4,000-10,000 cps @ 25 C, functionality of greater than 2.8 and percent phenyl content greater than 14.75.

Claims13

Dependent claims

An aromatic polyester polyol, suitable as the sole polyol in the production of polyurethane foams that have an E-84 tunnel fire test class one rating, said aromatic polyester polyol having a functionality range from 2.8 to 3.2 and a moderate viscosity ranging from 4,000-10,000 cps @ 25° C. inclusive, wherein said polyol is prepared by the transesterification or esterification of a mixture comprising:

46.9-66% w/w of a glycol,
24-34% w/w of a terephthalate source,
5.02-17% w/w glycerin,
0-14% w/w pentaerythritol,
0-5% w/w methyl glucoside,
0-10% w/w sorbitol,
0-15% w/w of a natural vegetable oil, modified natural vegetable oil or fatty acid derivative of vegetable oil.

4 more elements

Dependencies are inferred from the claim text.

High functional polyester polyols

Life of this patent

High functional polyester polyols

Life of this patent

Abstract

Claims13