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AssigneeCrompton Corporation
InventorWally Liyuan Chang
Estimating the term…
Semiflexible and flexible polyurethane foams having significantly reduced fogging and improved physical properties such as tensile strength, useful in the transportation industry, are obtained from a polyurethane foam-forming reaction-mixture containing as a polyester polyol for the foam a polyester polyol substantially free of any ether components which comprising: (a) at least one polyfunctional carboxylic acid and/or carboxylic anhydride compound; (b) at least one linear polyhydric alcohol; and (c) at least one branched polyhydric alcohol wherein the reactants of the polyester polyol are selected such that they cannot combine to provide a cyclic ester comprising a 12 to 14 membered ring. Optionally, the polyester polyol can further contain (d) a branched polyol having a functionality of at least three.
A semiflexible or flexible polyurethane foam having low fogging characteristics obtained from a polyurethane foam-forming reaction mixture containing as a polyester polyol for the foam a polyester polyol substantially free of any ether components which comprises:
A process for preparing a semiflexible or flexible polyurethane foam having low fogging characteristics comprising the step of reacting simultaneously or sequentially an organic isocyanate with a polyester polyol substantially free of any ether components to produce the foam, the polyester polyol comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Derived from dicarboxylic acids and dialcohols: from dicarboxylic acids and dialcohols in combination with polycarboxylic acids and/or polyhydroxy…
Foam properties: flexible
Foam properties: semi-rigid
Foam properties: prepared using water as the sole blowing agent
Term end not estimated
1. Technical Field
This invention relates generally to semiflexible and flexible polyurethane foams having low fogging characteristics and improved physical properties, e.g., tensile strength.
2. Description of the Related Art
This example is illustrative of the preparation of a polyesterol ether-containing polyol outside the scope of this invention using the following materials and conditions as set forth below in Table I: 1 TABLE I DEG (diethylene glycol) 488.80 grams GLY (glycerin) 19.70 grams AA (adipic acid) 652.40 grams Total Load 1,160.90 grams Organotin catalyst 0.02 grams Water to distill 160.90 grams Yield 1,000.00 grams Hydroxyl number 52.0 Temperature (C. °) 238 Calculated functionality 2.60 Acid number 0.50 maximum
Using the above ingredients, a four neck glass flask, equipped with a nitrogen inlet, a stirrer, a column, and a thermometer, was charged with the catalyst, diethylene glycol, glycerin, and adipic acid. The temperature was increased to 238° C.+/−2, while the column was kept hot using steam. The nitrogen and agitation were increased as the reaction proceeded to facilitate the water removal, but not rapid enough to blow out the glycol. During the reaction, the hydroxyl value and acid number were checked as needed and the loss of glycol during the reaction was adjusted by adding diethylene glycol as needed to reach the desired hydroxyl value of 52. The reaction was considered complete when the desired hydroxyl number of 52 and acid number of 0.50 was reached to form glycerin-branched poly(diethylene adipate)glycol.
This example is illustrative of the preparation of a polyester polyol within the scope of this invention using the following materials and conditions set forth below in Table II: 2 TABLE II EG (ethylene glycol) 226.90 grams PG (propylene glycol) 149.80 grams GLY (glycerin) 19.70 grams AA (adipic acid) 801.20 grams Total Load 1,197.60 grams Organotin catalyst 0.02 grams Water to distill 197.60 grams Yield 1,000.00 grams Hydroxyl number 52.0 Temperature (C. °) 238 Calculated functionality 2.60 Weight ratio (PG/EG) 0.66 (0.30 < 0.66 < 15) Acid number 0.50 maximum