摘要:
Embodiments of the invention provide for methods of producing a polycarbonate polyol. The method includes charging a vessel with butanediol, charging the vessel with a polymerization catalyst, and adding to the vessel dimethyl carbonate at a rate of at least 2.0 g of DMC per minute per kg of BDO to produce polycarbonate polyol at a polycarbonate polyol yield of at least 80% of a theoretical yield.
摘要:
Polyester-co-carbonate polyols and methods for producing the same are provided. The method comprises reacting one or more alcohols having an OH functionality of two or more with one or more organic diacids to form a reaction mixture, adding a first amount of dialkyl carbonate to the reaction mixture to remove water remaining from the reaction mixture by azeotropic drying, adding a transesterification catalyst to the dialkyl carbonate containing reaction mixture and adding a second amount of dialkyl carbonate to the catalyst containing reaction mixture.
摘要:
A two-component curable adhesive or sealant composition is provided. The first component may comprise a mixture of at least one polyol selected from the group comprising a polyester polyol, a polyester-polycarbonate copolymer polyol, and combinations thereof, a resin, and optionally a solvent. The second component may comprise a prepolymer obtained by reacting a polyester-polycarbonate copolymer polyol which is the reaction product of a polyester polyol which is the reaction product of one or more organic acids, and one or more glycols having a functionality of two or more and one or more polycarbonate polyols, at least one organic polyisocyanate component, and at least one chain extending agent and optionally a solvent. Alternatively, the first component may comprise a polyester-polycarbonate copolymer polyol, a resin, and optionally a solvent. The second component may comprise a polyisocyanate curative and optionally a solvent. The cured adhesive exhibits improved hydrolytic properties while maintaining excellent processability and adhesive properties.
摘要:
Embodiments of the invention generally relate to polyols having resistance to hydrocarbons and articles made therefrom. More specifically, embodiments of the invention generally relate to hydrophilic polyester-polycarbonate polyols having resistance to hydrocarbons at high temperatures and articles made therefrom. The novel hydrophilic polyester-polycarbonate polyols described herein may be used in adhesive or elastomer applications requiring enhanced oil and/or diesel resistance. The disclosed polyols are liquid at room temperature, which facilitates processing into polyurethane products As described herein, an elastomer made from such hydrophilic polyester-polycarbonate polyols and methylene diphenyl diisocyanate (MDI) retained >90% of tensile strength after 500 hours ageing at 121 degrees Celsius. A comparative example made from a polyester polyol retained 50% of tensile strength under similar conditions.
摘要:
Disclosed are hydrophobic polyester-polycarbonate polyols which are the reaction product of (a) a polyester polyol and (b) one or more polycarbonate polyols. The polyester polyol (a) is the reaction product of: (i) one or more hydrophobic monomers, (ii) one or more organic acids, and (iii) one or more alcohols having an OH functionality of 2 or more. The polyester-polycarbonate polyols may be both amorphous and liquid at room temperature and have excellent hydrolytic stability. The hydrolytic and chemical performance of the polyester-polycarbonate polyols described herein is superior to that of commercially available hydrophobically modified polyester polyols and to that of commercially available polyester-polycarbonate polyols as described herein.
摘要:
A system and method of transferring funds between accounts. A customer (user) sends an ACH transaction request to transfer an amount of funds from a first account of a first financial institution to a second account of a second financial institution. The first financial institution generates a same day ACH transaction to transfer the amount of funds from the first account to a general ledger account of the first financial institution and at the same time or near the same time, the first financial institution generates a next day or more ACH transaction including a transfer of the amount of funds from the general ledger account of the first financial institution to the second bank account of the second financial institution. The next day or more ACH transaction is completed only if the same day ACH transaction is completed.
摘要:
An obstruction detection system using a safety switch with a plurality of sensors is provided. The sensors include a sensing element molded in a casing and separated from an adjacent sensor by one of a plurality of connectors. A clip has a strip portion and a first attachment arm extending at an angle from the strip portion. A second attachment arm extends from the strip portion. A barb leg is disposed at an angle relative to the strip portion. The barb leg has a first leg end and a second leg end opposite the first leg end with the barb leg connected at the first leg end to the second attachment arm and the second leg end is disposed toward and spaced apart from the strip portion.
摘要:
Clips for attaching sensors, cables, or other items to doors, such as retrofitted armored vehicle doors, are provided. In one example embodiment, a clip includes a strip portion, a first attachment arm extending from the strip portion, and a second attachment arm extending from the strip portion. A barb leg is disposed at an angle relative to the strip portion and includes a first leg end and a second leg end opposite the first leg end. The barb leg is connected at the first leg end to the second attachment arm, and the second leg end is disposed towards and spaced apart from the strip portion. A cable clamp extends from an end of the second attachment arm opposite the strip portion or an end of the strip portion opposite the first attachment arm.
摘要:
The invention is directed to a method and product produced for directly synthesizing polyesteramides and copolyesteramides, especially self-assembling copolyesteramides, useful for manufacturing self-assembling materials.