Packaging foam polyurethane composition employing novel polyol blend
AssigneeTexaco Inc.
InventorsErnest L. Yeakey, Michael Cuscurida, Michael E. Brennan
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Abstract
Economical, open-celled packaging foams of better quality than foams from commercial aromatic polyester polyols may be prepared with a novel polyol blend. The most important component in the polyol blend is an aromatic polyester polyol made from dibasic acid waste streams and recycled polyethylene terephthalate. This type of polyol made from waste or recycled reactant streams is economical to make and serves as an inexpensive substitute for a portion of more expensive amino polyols normally used.
Claims17
A method for making low density packaging polyurethane foam comprising reacting in the presence of a tertiary amine catalyst of polyurethane formation and a blowing agent, an organic polyisocyanate and a polyol blend comprising
- a. 10 to 25 wt.% of an aromatic polyester polyol having a hydroxyl number of from 210 to 230 which is the reaction product from
- (1) esterifying, in the absence of a catalyst, a residue from dibasic acid manufacture which comprises one or more acids from the group consisting of glutaric acid, succinic acid and adipic acid, with an alkylene glycol to produce a polyester polyol intermediate, and
- (2) transesterifying, in the absence of a catalyst, recycled polyethylene terephthalate with the polyester polyol intermediate of the previous step,
- b. 30 to 50 wt.% of a rigid amino polyol having a hydroxyl number of from 440 to 540 which is based on sucrose or an aromatic amine polyol,
- c. 5 to 25 wt.% of an organic surfactant alcohol, and
- d. 25 to 35 wt.% of a polyether triol having a molecular weight of at least 4,500 and a primary hydroxyl content of greater than 75%.
A polyol blend composition for lowdensity packaging foam formulations comprising
- a. 10 to 25 wt.% of an aromatic polyester polyol having a hydroxyl number of from 210 to 230 which is the reaction product from
- (1) esterifying, in the absence of a catalyst, a residue from dibasic acid manufacture which comprises one or more acids from the group consisting of glutaric acid, succinic acid and adipic acid, with an alkylene glycol to produce a polyester polyol intermediate and
- (2) transesterifying, in the absence of a catalyst, recycled polyethylene terephthalate with the polyester polyol intermediate of the previous step,
- b. 30 to 50 wt.% of a rigid amino polyol having a hydroxyl number of from 440 to 540 which is based on sucrose or an aromatic amine polyol,
- c. 5 to 25 wt.% of an organic surfactant alcohol, and
- d. 25 to 35 wt.% of a polyether triol having a molecular weight of at least 4,500 and a primary hydroxyl content of greater than 75%.
A low-density, open-celled packaging foam made by the process comprising
- reacting in the presence of a tertiary amine catalyst of polyurethane formation and a blowing agent, an organic polyisocyanate and a polyol blend comprising
- a. 10 to 25 wt.% of an aromatic polyester polyol having a hydroxyl number of from 210 to 230 which is the reaction product from
- (1) esterifying, in the absence of a catalyst, a residue from dibasic acid manufacture which comprises one or more acids from the group consisting of glutaric acid, succinic acid and adipic acid, with an alkylene glycol to produce a polyester polyol intermediate, and
- (2) transesterifying, in the absence of a catalyst, recycled polyethylene terephthalate with the polyester polyol intermediate of the previous step,
- b. 30 to 50 wt.% of a rigid amino polyol having a hydroxyl number of from 440 to 540 which is based on sucrose or an aromatic amine polyol,
- c. 5 to 25 wt.% of an organic surfactant alcohol, and
- d. 25 to 35 wt.% of a polyether triol having a molecular weight of at least 4,500 and a primary hydroxyl content of greater than 75%.
Dependencies are inferred from the claim text.