Process to manufacture polyurethane products using polymer polyols in which the carrier polyol is a tertiary amone based polyol
The present invention pertains to a copolymer polyols based on tertiary amine based polyols and to polyurethane products made therefrom. The use oof such copolymer polyols reduces the amount of amine catalysts needed for the production of polyurethane foam.
1 . A process for the production of polyurethane products by reaction of a mixture of
(a) at least one organic polyisocyanate with
(b) a polyol composition comprising
(b 1) from 0 to 99 percent by weight of a polyol compound having a functionality of 2 to 8 and a hydroxyl number of from 20 to 800 and
(b2) from 100 to 1 percent by weight of at least one polyol compound having a functionality of 1 to 8 and a hydroxyl number of from 15 to 200,
wherein the weight percent is based on the total amount of polyol component (b), and (b2) is a copolymer polyol composition comprising solids (b2i) dispersed in a carrier polyol (b2ii) wherein
(b2) contains at least 2 percent and up to 60 percent solids (b2i) dispersion and at least 2 percent of the carrier polyol (b2ii) is a tertiary amine based polyol (b2iii);
(c) optionally in the presence of a blowing agent; and
(d) optionally additives or auxiliary agents known se for the production of polyurethane products.
2 . The process of claim 1 wherein the carrier polyol (b2iii) has a functionality of from 2 to 6.
3 . The process of claim 2 wherein the carrier polyol (b2iii) has an equivalent weight from 500 to 3000.
4 . The process of claim 3 wherein the carrier polyol has an equivalent weight from 1000 to 2000.
5 . The process of claim 1 wherein the amine based carrier polyol (b2iii) is made from a tertiary amine initiator which contains at least one N-methyl amino group or N,N-dimethylamino group.
6 . The process of claim 1 wherein the amine based carrier polyol (biii) is initiated with a molecule containing 2 to 8 active hydrogen atoms and is subsequently capped with a tertiary amine or contains a tertiary amine in the polyol chain.
7 . The process of claim 1 wherein the solids content (b2i) in the copolymer polyol is from 10 to 60 percent preferably from 10 to 50 percent.
8 . The process of claim 1 wherein the solids (b2i) of (b2) are either based on polymers of styrene and/or acrylonitrile, polyurea, polyisocyanate polyadditon product, epoxide or a mixture thereof.
9 . The process of claim 1 wherein the mixture further contains flame retardant agents.
10 . The process of claim 1 wherein the foam hardness and reactivity of the polyurethane foaming systems is adjusted by varying the ratio between copolymer polyol (b2) and polyol (b2iii) by using (b2iii) as part of (b 1) in the formulation.
11 . A polyurethane product prepared by the process of claim 1 .
12 . A polymer polyol composition produced by a free radical polymerization comprising:
(a) a polyol
(b) at least one ethylenically unsaturated monomer;
(c) a free radical polymerization initiator and
(d) a chain transfer agent wherein the chain transfer agent is polyol produced from a tertiary amine initiator having at least one N-methyl amino group, or N,N-dimethyl amino group, or a polyol initiated with a molecule containing 2 to 8 active hydrogen atoms wherein the polyol is capped with a tertiary amine or a polyol which contains a tertiary amine in the polyol chain.