Rigid foam with improved insulating power

Patent metadata

Field	Value
Publication number	US-11718703-B2
Application number	US-201916963347-A
Country	US
Kind code	B2
Filing date	Jan 22, 2019
Priority date	Jan 22, 2018
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A rigid foam or composition allowing a rigid foam to be obtained made from polyurethane and/or polyisocyanurate. The rigid foam or composition includes polyols selected from polyester polyols and polyether polyols; the polyols include: 5 to 50% of a polyester polyol A by weight relative to the total weight of the polyols; and a polyol B selected from polyester polyols B and polyether polyols B. The polyester polyol A is of general formula Rx-Ry-Z-Ry′-Rx′ in which Z is a C3 to C8 alcohol sugar chosen from glycerol, sorbitol, erythritol, xylitol, araditol, ribitol, dulcitol, mannitol and volemitol. Ry and Ry′ are diesters of formula —OOC—Cn-COO— in which n is between 2 and 34, and Rx and Rx′ are identical or different C2 to C12 monoalcohols.

First claim

The invention claimed is:

1. A rigid foam or composition allowing a rigid foam to be obtained made from polyurethane and/or polyisocyanurate, said foam or composition comprising polyols selected from polyester polyols and polyether polyols; said polyols comprising:
from 5 to 50% of a polyester polyol A by weight relative to the total weight of the polyols; and a polyol B selected from polyester polyols B and polyether polyols B;
said polyester polyol A being of general formula Rx-Ry-Rz-Ry′-Rx′, wherein Rz is a C3 to C8 alcohol sugar selected from glycerol, sorbitol, erythritol, xylitol, arabitol, ribitol, dulcitol, mannitol and volemitol, Ry and Ry′ are identical or different diesters of formula —OOC—C n —COO— with n comprised between 2 and 34, and Rx and Rx′ are identical or different C2 to C12 monoalcohols.

2. The rigid foam or composition allowing a rigid foam to be obtained according to claim 1 , wherein the mass ratio of polyester polyol A over the polyol B is comprised between 5/95 and 50/50.

3. The rigid foam or composition allowing a rigid foam to be obtained according to claim 1 , wherein said polyester polyol A is obtained by:
a first polycondensation (a) of a C3 to C8 alcohol sugar Z, selected from glycerol, sorbitol, erythritol, xylitol, arabitol, ribitol, dulcitol, mannitol and volemitol; and of two identical or different C4 to C36 diacids Y and Y′, and
a second polycondensation (b) of the product obtained in (a) with two identical or different C2 to C12 diols X and X′.

4. The rigid foam or composition allowing a rigid foam to be obtained according to claim 3 , wherein the diacids Y and Y′ are independently selected from butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid, decanedioic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, and mixtures thereof.

5. The rigid foam or composition allowing a rigid foam to be obtained according to claim 3 , wherein the diols X and X′ are independently selected from 1,2-ethanediol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, 1,10-decanediol, 1,12-dodecanediol, and mixtures thereof.

6. The rigid foam or composition allowing a rigid foam to be obtained according to claim 1 , wherein said foam or composition has a cell size with a minimum diameter in the transverse direction comprised between 50 and 350 μm and/or a bulk density comprised between 22 to 60 kg/m 3 and/or has a measurement of the lower thermal conductivity coefficient comprised between 18 and 30 mW/(m×K) and/or comprises 5 to 49% of a polyester polyol A by weight relative to the total weight of the polyol.

7. The rigid foam or composition allowing a rigid foam to be obtained according to claim 1 , wherein the polyester polyol A has a molecular weight comprised between 350 g/mol and 2,000 g/mol and/or a hydroxyl value from 300 to 900 mg KOH/g and/or a viscosity at 25° C. comprised from 4,000 to 25,000 mPa·s.

8. The rigid foam or composition allowing a rigid foam to be obtained according to claim 1 , wherein said foam has a cell size with a minimum diameter in the transverse direction comprised between 50 and 350 μm and/or a bulk density comprised between 22 and 60 kg/m 3 .

9. The rigid foam or composition allowing a rigid foam to be obtained according to claim 1 , wherein said foam comprises at least one reaction catalyst, at least one blowing agent, a stabilizer, at least one polyisocyanate having a functionality at least equal to 2 and, optionally, a flame retardant.

10. The rigid foam or composition allowing a rigid foam to be obtained according to claim 9 , said foam being a polyisocyanate foam and comprising:
60 to 100 parts of polyols of which 5 to 50% by weight of said polyester polyol A on the weight of polyol,
100 to 700 parts of at least one polyisocyanate,
0.1 to 13 parts of at least one catalyst,
0.5 to 80 parts of at least one blowing agent,
0.2 to 8 parts of a stabilizer, and
0 to 30 parts of a flame retardant.

11. The rigid foam or composition allowing a rigid foam to be obtained according to claim 10 , said foam being a polyisocyanate foam and comprising:
from 70 to 100 parts of polyols of which 5 to 49% by weight of said polyester polyol A on the weight of polyol,
from 120 to 650 parts of at least one polyisocyanate,
from 0.5 to 12 parts of at least two catalysts,
from 5 to 70 parts of at least one blowing agent,
from 1 to 7 parts of a stabilizer, and
from 5 to 25 parts of a flame retardant.

12. The rigid foam or composition allowing a rigid foam to be obtained according to claim 10 , said foam being a polyisocyanate foam and comprising:
between 80 and 100 parts of polyols of which 5 to 49% by weight of said polyester polyol A on the weight of polyol,
between 150 and 575 parts of at least one polyisocyanate,
between 1 and 11 parts of at least two catalysts being an amine catalyst and a potassium carboxylate,
between 10 and 60 parts of at least one blowing agent,
between 1.5 and 6 parts of a stabilizer, and
between 10 and 20 parts of a flame retardant.

13. The rigid foam or composition allowing a rigid foam to be obtained according to claim 9 , said foam being a polyurethane foam and comprising:
at least 1 to 100 parts of polyols of which 5 to 50% of said polyester polyol A by weight relative to the total weight of the polyol,
150 to 500 parts of at least one polyisocyanate,
0.5 to 5 parts of at least one catalyst,
0.5 to 15 parts of at least one blowing agent,
0.2 to 5 parts of a stabilizer, and
0 to 30 parts of a flame retardant.

14. The rigid foam or composition allowing a rigid foam to be obtained according to claim 13 , said foam being a polyurethane foam and comprising:
from 40 to 100 parts of polyols of which 5 to 49% of said polyester polyol A by weight relative to the total weight of the polyol,
from 160 to 425 parts of at least one polyisocyanate,
0.5 to 5 parts of at least one catalyst,
0.5 to 12 parts of a chemical blowing agent and/or 0 to 60 parts of a physical blowing agent,
0.2 to 5 parts of a stabilizer, and
0 to 30 parts of a flame retardant.

15. The rigid foam or composition allowing a rigid foam to be obtained according to claim 13 , said foam being a polyurethane foam and comprising:
between 80 to 100 parts of polyols of which 5 to 49% of said polyester polyol A by weight relative to the total weight of the polyol,
between 180 and 375 parts of at least one polyisocyanate,
0.5 to 5 parts of at least one amine catalyst,
0.6 to 10 parts of a chemical blowing agent and/or 0.5 to 30 parts of a physical blowing agent,
0.2 to 5 parts of a stabilizer being a polyether-polysiloxane copolymer, and
0 to 30 parts of a flame retardant.

16. The rigid foam or composition allowing a rigid foam to be obtained according to claim 1 , wherein the polyol B has a hydroxyl value comprised between 80 and 800 mg KOH/g and/or a functionality greater than or equal to 2, and/or a molar mass (Mn) comprised between 50 and 4,000 g/mol and/or an acid value less than 10 mg KOH/g and/or a viscosity less than 50,000 mPa·s at 25° C.

17. The rigid foam or composition allowing a rigid foam to be obtained according to claim 9 , wherein:
the at least one polyisocyanate is selected from toluene diisocyanate, 4,4′-diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate and mixtures thereof; and/or
the at least one catalyst is selected from at least one tertiary amine, at least one potassium carboxylate and at least one triazine and m

Assignees

• Tereos Starch & Sweeteners Belgium
• Centre Nat Rech Scient
• Soprema
• Univ Strasbourg

Inventors

• Bindschendler Pierre Etienne
• Sarbu Alexandru
• Perrin Rémi
• Furtwengler Pierre
• Avérous Luc
• Redl Andréas

Classifications

• C08G18/163 Primary

  covered by C08G18/18 and C08G18/22 · CPC title

• C08G18/4241

  from dicarboxylic acids and dialcohols in combination with polycarboxylic acids and/or polyhydroxy compounds which are at least trifunctional · CPC title

• C08G18/7664 Primary

  containing alkylene polyphenyl groups · CPC title

• C08J9/141

  Hydrocarbons · CPC title

• C08G2110/0025

  rigid · CPC title