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1. WO2016115021 - PROCÉDÉ POUR PROLONGER LA DURÉE DE VIE DE PROPULSEURS OLÉFINIQUES GAZEUX DANS DES MOUSSES DE POLYURÉTHANNE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

What is Claimed is:

1. A two-component polyurethane foam having a rise, a height, an initial foam gel time and a tack time which is within approximately 20% of those parameters using the propellant HFO-1234ze as compared to a polyurethane foam blown using the blowing agent HFC-134a after accelerated aging of said reactants when under pressure of at least approximately 130 psi, comprising:

an "A-side" diisocyanate; and

a "B-side" blend comprising:

at least one aromatic polyester polyol and no more than approximately 10% aliphatic polyether polyol; and

at least two catalysts comprising:

at least one tertiary amine catalyst comprising at least two cyclohexyl rings; at least one aliphatic metal salt catalyst; and

up to about 1.5 wt.% water.

2. The polyurethane foam of claim 1 wherein

said at least one aromatic polyester polyol is at least two aromatic polyester polyols.

3. The polyurethane foam of claim 2 which further comprises

no more than ~1% of an aliphatic polyether polyol.

4. The polyurethane foam of claim 2 comprising:

essentially no added water.

5. The polyurethane foam of claim 1 in which the at least one aromatic polyester polyol comprises: at least two aromatic rings.

6. The polyurethane foam of claim 1 wherein

the at least one tertiary amine catalyst comprises no more than 11 weight percent nitrogen.

7. The polyurethane foam of claim 6 wherein

the at least one tertiary amine catalyst comprises no more than 10 weight percent nitrogen.

8. The polyurethane foam of claim 1 wherein

the aliphatic metal salt is a metal alkanoate.

9. The polyurethane foam of claim 7 wherein

the metal alkanoate is a potassium alkanoate.

10. The polyurethane foam of claim 8 wherein

the potassium alkanoate is potassium octoate.

11. The polyurethane foam of claim 1 wherein

a catalytic decay ratio of the gel time of the polyurethane foam exposed to accelerated aging involving storing the reactant combination and propellant at 50°C for approximately 48 days prior to reacting the "A" and "B" cylinders and spraying the polyurethane foam increases approximately to no more than 2 for a polyurethane spray foam and approximately no more than 2.5 for a pour-in-place polyurethane foam.

12. The polyurethane spray foam of claim 2 in which the at least two aromatic polyester polyols is selected from the group consisting of:


13. A process to improve the shelf life of gaseous HFO-blown two-component polyurethane foams comprising the steps of:

using no less than 50% aromatic polyester polyols of all of the polyols used in the "B"- side formulation, said "B"-side formulation having no more than about 1.5% water by weight; and using a catalyst combination of a tertiary amine catalyst comprising at least two cyclohexyl rings, said tertiary amine catalyst having less than 11 weight percent nitrogen; and an aliphatic metal salt catalyst.

14. The process of claim 13 wherein

the tertiary amine catalyst has less than or equal to about 10% nitrogen on a weight basis;

said "B"-side formulation having between 0.1-1.3% water by weight.

15. The process of claim 14 wherein

the tertiary amine catalyst has less than or equal to about 8% nitrogen on a weight basis; said "B"-side formulation having between 0.5-1.0% water by weight.

16. The process of claim 13 wherein the polyurethane foam comprises:

no more than approximately 10% aliphatic polyether polyol.

17. The process of claim 16 wherein the polyurethane foam comprises:

no added aliphatic polyether polyol.

18. The process of claim 13 further comprises the step of adding

at least two aromatic polyester polyols.

19. The process of claim 13 wherein

a catalytic decay ratio of the gel time of the polyurethane foam exposed to accelerated aging involving storing the reactant combination and propellant at 50°C for approximately 48 days prior to reacting the "A" and "B" cylinders and spraying the polyurethane foam increases approximately to no more than 2 for a polyurethane spray foam and approximately no more than 2.5 for a pour-in-place polyurethane foam.

20. A process of using a catalytic decay ratio of gel time of a polyurethane foam to determine the viability of said polyurethane foam, said process comprising the step of:

calculating the catalytic decay ratio of the gel time of the polyurethane foam exposed to accelerated aging involving storing the reactant combination and propellant at 50°C for approximately 48 days prior to reacting the "A" and "B" cylinders; and

spraying the polyurethane foam; and

measuring the catalytic decay ratio of the gel time; and

determining if the increase is approximately no more than 2 for a polyurethane spray foam and approximately no more than 2.5 for a pour-in-place polyurethane foam.