Production of Polyester Reference. In the case of alkaline catalysts, these alkaline catalysts are preferably removed from the polyol at the end of production by a proper finishing step, such as coalescence, magnesium silicate separation or acid neutralization. It is further desirable to have an aromatic polyester polyol having low viscosity, good hydrocarbon compatibility and based on aromatic content may be used in the production of polyurethane products to meet flame retardation standards. Examples of such catalysts include tetrabutyltitanate, dibutyl tin oxide, potassium methoxide, or oxides of zinc, lead or antimony; titanium compounds such as titanium IV isopropoxide and titanium acetylacetonate. Ref country code : GR. They possess better properties related to: tension and tear strength, flex fatigue, abrasion, adhesion and dimensional stability. The polyesters may be used as part of a formulation for making a polyurethane and are particularly applicable in formulations for producing rigid foam.
Adipic acid based polyester polyols are used in applications where flexibility is wanted, Structure. adipic acid, diethylene glycol, trimethylol propane.
Aromatic Polyester Polyols Manufacturer from Navi Mumbai
adipic acid. Aromatic polyester polyols based on terephthalic or isophthalic acids are. need high functionality and the plasticising effect of polyester structures is is the reason for the extremely rapid growth of aromatic polyester polyols, of low.
These low molecular weight, aromatic polyester polyols find applications in rigid foam and impart low The chemical structure of some polyols is given in Figs.
Examples of linear alkyl amine, include for example, ethylene diethanolamine, N-methyldiethanolamine, ethylene diamine, diethanolamine, diisopropanolamine, monoisopropanolamine, etc.
The aromatic polyester polyols of the present invention can be readily blended with prior art polyols, if desired, and also with various additives conventionally used in the formulation of resin pre-polymer blends.
This product is not particularly dangerous for health. Ref country code : AL. One class of aromatic polyester polyols widely used is a polyol produced by esterification of phthalic acid or phthalic acid anhydride with an aliphatic polyhydric alcohol, for example, diethylene glycol.
(coatings, adhesives, sealants and. Presents applications and characteristics of Aromatic polyester polyols MAXIMOL ® We offer the inflammable type, compatible type, aqueous formula type, etc.
The polyether polyol include those obtained by the alkoxylation of suitable starting molecules initiators with a C 2 to C 4 alkylene oxide, such as ethylene oxide, propylene oxide, 1,2- or 2,3-butylene oxide, tetramethylene oxide or a combination of two or more thereof.
Organosilicone surfactants are generally preferred types.
The polyester polyol of claim 6 wherein a two functional glycol is represented by the formula. In the VAI process, the mold pressure is reduced to to mbar kPapreferably from to mbar kPa and even more preferably from to mbar kPabefore or immediately after the foam forming composition is charged to the mold.
Country of ref document : DE.
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|After the foam formulation has expanded and cured enough to be dimensionally stable, the resulting assembly can be "demolded" by removing it from the jig or other support that is used to maintain the shell and liner in their correct relative positions.
In one aspect, the invention is a polyester polyol comprising the reaction product of at least:. Ref country code : SM. The hydrolysis stability of the ester linkage is inferior to that of the ether linkage in the polyethers, and residual esterification catalysts accelerate the hydrolysis. A process for the production of elastic polyurethane moldings having a compact surface and a cellular core.