Cellular structures and viscoelastic polyurethane foams

Patent metadata

Field	Value
Publication number	US-9266996-B2
Application number	US-201213646056-A
Country	US
Kind code	B2
Filing date	Oct 5, 2012
Priority date	Jul 18, 2008
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

The present invention discloses a structure comprising a plurality of three dimensional cells, wherein each cell comprises exterior walls defining an interior void wherein the walls comprise a plurality of struts and windows, the struts forming borders for the plurality of windows, wherein the struts have a plurality of pores. The present invention further discloses a viscoelastic foam having a ratio of elastic modulus (E′) at 20° C. to 25% compression force deflection (CFD) of 25 to 125.

First claim

What is claimed is:

1. A polyol composition comprising:
a1) from 30 to 80 weight percent, based on a total weight of the polyol composition, of at least one polyoxypropylene or a polyoxyethylene-polyoxypropylene polyol, having an average equivalent weight between 100 and 2000 and an average nominal hydroxy functionality of 2-4, with the proviso if the polyol is a polyoxyethylene-polyoxypropylene polyol, the polyoxypropylene content is at least 70% by weight of the polyol;
a2) from 5 to 50 weight percent, based on the total weight of the polyol composition, of a polyoxyethylene or a polyoxyethylene-polyoxypropylene polyol, having an average equivalent weight between 100 and 1000; and an average nominal hydroxy functionality of 2-4, with the proviso if the polyol is a polyoxyethylene-polyoxypropylene polyol, the polyoxyethylene content is at least 70% by weight of the polyol; and
a3) from 1 to 20 wt %, based on the total weight of the polyol composition, of:
(i) a monol or blend of monols having an average equivalent weight of 500 or greater and comprising >60% by weight of a polyoxyalkylene, wherein the alkylene oxide contains 4 or more carbon atoms;
(ii) a polyoxyalkylene polyol having a functionality of 2 to 4, an equivalent weight of 500 to 3000 wherein the alkylene oxide contains greater than 60% by weight of alkylene oxides having 4 or more carbon atoms;
(iii) a polybutadiene having an equivalent weight of 2250 to 6000; or
(iv) a combination thereof.

2. The composition of claim 1 wherein the polyol a1) comprises two separate polyols a1a) having an equivalent weight of 200 to 700, and a1b) having an equivalent weight of greater than 700.

3. The polyol composition of claim 2 wherein the polyoxypropylene content based on a1a) and a1b) is at least 75 wt percent.

4. The polyol composition of claim 3 wherein the polyoxypropylene content based on a1a) and a1b) is at least 85 wt percent.

5. The polyol composition of claim 1 wherein the component a3) includes the polybutadiene having an equivalent weight of 2200 to 5500.

6. A process for preparing a viscoelastic polyurethane foam, comprising
A) forming a reaction mixture including at least
a) an isocyanate reactive component comprising the polyol composition as claimed in claim 1 ;
b) at least one polyisocyanate,
c) water in an amount of 0.5 to 3.5 weight percent of a), and
d) optional additives and auxiliaries; and

B) subjecting the reaction mixture to conditions sufficient to cause the reaction mixture to expand and cure to form a viscoelastic polyurethane foam.

Assignees

• Dow Global Technologies Llc

Inventors

• Obi Bernard E
• Schrock Alan K
• Gamboa Rogelio R
• Shafi Asjad
• Aou Kaoru

Classifications

• C08G18/7621

  being toluene diisocyanate including isomer mixtures · CPC title

• Y10T428/249953

  Composite having voids in a component [e.g., porous, cellular, etc.] · CPC title

• C08G18/4854

  Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group · CPC title

• C08G18/4837

  and other oxyalkylene units · CPC title

• C08G18/283

  Compounds containing ether groups, e.g. oxyalkylated monohydroxy compounds · CPC title