Sustainable Polyester Polyols and Uses Thereof
The present disclosure provides an isocyanate-reactive hydrogen composition including an increased amount of a sustainable polyester polyol. The isocyanate-reactive hydrogen composition may be combined with a polyisocyanate composition to form a reaction system which can be reacted and expansion moulded to form a flexible foam. The flexible foam that is produced may be used in a variety of applications, such as in automotive and furniture seating.
1 . An isocyanate-reactive hydrogen composition comprising at least 15% by weight of a sustainable polyester polyol derived from (i) a thermoplastic polyester, (ii) a hydroxylated material, and (iii) a hydrophobic material wherein the sustainable polyester polyol has a primary hydroxyl content of at least about 30%, calculated on the number of primary and secondary hydroxyl groups in the polyester polyol and wherein the % by weight is based on the total weight of components containing an isocyanate reactive-hydrogen present in the composition.
2 . The isocyanate-reactive hydrogen composition of claim 1 , further comprising a first polyether polyol comprising polyether chains containing at least about 50% by weight ethylene oxide (EO), based on the total weight of the first polyether polyol.
3 . The isocyanate-reactive hydrogen composition of claim 2 , wherein the polyether polyol comprises polyether chains containing at least about 70% by weight EO, based on the total weight of the first polyether polyol.
4 . The isocyanate-reactive hydrogen composition of claim 1 , wherein the thermoplastic polyester is a recycled polyester.
5 . The isocyanate-reactive hydrogen composition of claim 1 , wherein the hydroxylated material is selected from (1) an aliphatic diol having a formula:
HO—R 1 —OH
wherein R 1 is a divalent radical selected from the group consisting of: (a) an alkylene radical containing from 2 to 12 carbon atoms, (b) a radical of the formula:
—(R 2 O) n −R 2 —
where R 2 is an alkylene radical containing from 2 through 4 carbon atoms, and n is an integer from 1 to 20 and (c) a mixture thereof.
6 . The isocyanate-reactive composition of claim 1 , wherein the hydrophobic material is a natural oil, a functionalized natural oil or a combination thereof.
7 . The isocyanate-reactive composition of claim 2 , wherein the first polyether polyol is present in the isocyanate-reactive hydrogen composition in an amount of from about 35%-70% by weight, based on the total weight of the components containing an isocyanate-reactive hydrogen.
8 . The isocyanate-reactive composition of claim 1 , further comprising water and optionally one or more of a catalyst, non-ionic surfactant, silicon-based surfactant, fire retardant, smoke suppressant, UV-stabilizer, colorant, microbial inhibitor, filler, internal mould release agent and external mould release agent.
9 . The isocyanate-reactive composition of claim 1 , wherein the sustainable polyester polyol has a primary hydroxyl content of at least about 45%, calculated on the number of primary and secondary hydroxyl groups in the polyester polyol.
10 . A reaction system comprising (a) a polyisocyanate composition comprising an organic polyisocyanate and (b) an isocyanate-reactive composition comprising (b1) at least 15% by weight of a sustainable polyester polyol derived from (i) a thermoplastic polyester, (ii) a hydroxylated material, and (iii) a hydrophobic material wherein the sustainable polyester polyol has a primary hydroxyl content of at least about 30%, calculated on the number of primary and secondary hydroxyl groups in the polyester polyol and wherein the % by weight is based on the total weight of components containing an isocyanate reactive-hydrogen present in the composition, (b2) a first polyether polyol comprising polyether chains containing at least about 50% by weight ethylene oxide (EO), based on the total weight of the first polyether polyol and (b3) water.
11 . The reaction system of claim 10 , wherein the organic polyisocyanate is selected from (1) a diphenylmethane diisocyanate comprising at least 40% by weight, based on the total weight of the diphenylmethane diisocyanate of 4,4′-diphenylmethane diisocyanate (4,4′-MDI); (2) a carbodiimide and/or uretonimine modified variant of diphenylmethane diisocyanate (1) having an NCO value of 20% by weight or more; and
(3) a mixture thereof.
12 . The reaction system of claim 11 , wherein the organic polyisocyanate is a diphenylmethane diisocyanate comprising at least 50% by weight of 4,4′-MDI.
13 . The reaction system of claim 10 , wherein the isocyanate-reactive hydrogen composition further comprises a catalyst.
14 . The reaction system of claim 10 , wherein the sustainable polyester polyol has a primary hydroxyl content of at least about 45%, calculated on the number of primary and secondary hydroxyl groups in the polyester polyol.
15 . A process for producing a flexible foam comprising reacting and expansion moulding the polyisocyanate composition and the isocyanate-reactive hydrogen composition of the reaction system of claim 10 .
16 . The process of claim 15 , wherein the reaction may be conducted at an NCO index of 40-120.
17 . A flexible foam produced according to the process of claim 15 .
18 . An article comprising the flexible foam of claim 17 .
19 . The article of claim 18 , wherein the article is a seat cushion or a seat back for use in a motor vehicle or in furniture.
20 . The article of claim 19 wherein the article is for use in automotive carpet, dash insulation, steering wheel or instrument panel.