Visco-elastic polyurethane foam with castor oil
The present invention relates to polyether polyol compositions containing renewable raw materials, a process for preparing visco-elastic polyurethane foams using such compositions, correspondingly prepared visco-elastic foam materials, and the use thereof.
1. A polyether polyol composition for use in preparing visco-elastic polyurethane foams, comprising:
(a) a polyether polyol having a hydroxyl functionality of 3, an OH number in the range of from 210 to 255 mg of KOH/g and a PO content in the range of from 90 to 100% by weight;
(b) a polyether polyol whose polyol starting molecule is not derived from a renewable raw material, having a hydroxyl functionality of 2, an OH number in the range of from 41 to 71 mg of KOH/g and a PO content in the range of from 90 to 100% by weight;
(c) a polyether polyol having a hydroxyl functionality of 2, an OH number in the range of from 92 to 132 mg of KOH/g and a PO content in the range of from 90 to 100% by weight; and
(d) at least one renewable raw material wherein each molecule of raw material has at least one free OH group wherein the proportion of (d) in said polyether polyol composition is in the range of from 5 to 50% by weight.
2. The composition of claim 1 , wherein the proportion of (a) in said polyether polyol composition is in the range of from 32 to 54% by weight.
3. The composition of claim 1 , wherein the proportion of (b) in said polyether polyol composition is in the range of from 16 to 27% by weight.
4. The composition of claim 1 , wherein the proportion of (c) in said polyether polyol composition is in the range of from 11 to 19% by weight.
5. The composition of claim 1 , wherein said polyether polyol of (a) is derived from glycerol as the starter molecule.
6. The composition of claim 1 , wherein said polyether polyol of (b) is derived from propylene glycol as the starter molecule.
7. The composition of claim 1 , wherein said polyether polyol of (c) is derived from propylene glycol as the starter molecule.
8. The composition of claim 1 , wherein said renewable raw material of (d) comprises castor oil and/or partially and/or completely hydrogenated castor oil.
9. The composition of claim 1 , further comprising (e) a polyether polyol having a hydroxyl functionality of 2, an OH number in the range of from 450 to 550 mg of KOH/g and a PO content in the range of from 90 to 100% by weight.
10. The composition of claim 9 , wherein said polyether polyol of (e) is derived from propylene glycol as the starter molecule.
11. The composition of claim 9 , wherein the proportion of (e) in said polyether polyol composition is in the range of from 1 to 5% by weight.
12. A process for preparing a visco-elastic foam comprising reacting
(a) a polyether polyol composition comprising:
(i) a polyether polyol having a hydroxyl functionality of 3, an OH number in the range of from 210 to 255 mg of KOH/g and a PO content in the range of from 90 to 100% by weight;
(ii) a polyether polyol whose polyol starting molecule is not derived from a renewable raw material, having a hydroxyl functionality of 2, an OH number in the range of from 41 to 71 mg of KOH/g and a PO content in the range of from 90 to 100% by weight;
(iii) a polyether polyol having a hydroxyl functionality of 2, an OH number in the range of from 92 to 132 mg of KOH/g and a PO content in the range of from 90 to 100% by weight; and
(iv) at least one renewable raw material wherein each molecule of raw material has at least one free OH group;
(b) a polyisocyanate component; and
(c) optionally water and one or more catalysts;
and optionally further auxiliaries, fillers, and/or foaming agents.
13. The process of claim 12 , wherein the amount of polyisocyanate component is selected to have an isocyanate characteristic number within a range of from 70 to 120.
14. The process of claim 13 , wherein the amount of polyisocyanate component is selected to have an isocyanate characteristic number within a range of from 85 to 105.
15. The process of claim 12 , wherein a polyisocyanate component obtained by prepolymerization is employed.
16. The process of claim 15 , wherein a polyether polyol composition comprising:
(a) a polyether polyol having a hydroxyl functionality of 3, an OH number in the range of from 210 to 255 mg of KOH/g and a PO content in the range of from 90 to 100% by weight;
(b) a polyether polyol whose polyol starting molecule is not derived from a renewable raw material, having a hydroxyl functionality of 2, an OH number in the range of from 41 to 71 mg of KOH/g and a PO content in the range of from 90 to 100% by weight;
(c) a polyether polyol having a hydroxyl functionality of 2, an OH number in the range of from 92 to 132 mg of KOH/g and a PO content in the range of from 90 to 100% by weight; and
(d) at least one renewable raw material wherein each molecule of raw material has at least one free OH group
is employed in said prepolymerization.
17. A visco-elastic foam prepared by the process of claim 12 .
18. A shaped body comprising the visco-elastic foam of claim 17 .
19. A mattress, pillow, seat cover, shoe sole, earplug, protective clothing, protective equipment, or sound insulation comprising the visco-elastic foam of claim 18 .