摘要:
Provided are a varnish mainly containing a polyester imide and capable of forming a low-permittivity insulating layer, as well as an insulated electronic wire achieving low permittivity by using the varnish. The varnish mainly contains a polyester imide resin obtained by reacting a carboxylic acid including a dicarboxylic acid, or an anhydride or alkyl ester thereof (carboxylic acid or derivative thereof), an alcohol, and a diamine compound with one another. In the varnish, adjustment is made such that a molar ratio (OH/COOH) of hydroxyl groups of the alcohol to carboxyl groups of the carboxylic acid or derivative thereof becomes 1.9 or less or such that a content of highly polarized imide groups per unit amount of polyester imide chain is reduced by increasing molecular weights of the raw material monomers.
摘要:
The present invention relates to a kind of biodegradable polyester and its preparation method, which belongs to the field of biodegradable co-polyester product technology. The number-average molecular weight of the biodegradable polyester material under this invention is 6000-135000 g/mol, the molecular weight distribution is 1.2-6.5, and the range of crystallization temperature is 15° C.-105° C., which could overcome the disadvantages of existing technical products and can be processed into membrane materials, sheet materials and foam materials. During processing, the picking property will be dramatically changed with the appearance quality improved; after heat resistance is improved, this new type of polyester material could also be applied to the processing course with long cycles, for example, the injection processing course, and the biodegradable aliphatic/aromatic polyester materials provided by this invention has excellent mechanical properties.
摘要:
The present invention Nos. 1-3 provide a spandex filament which is excellent in view of a recovering ability of elasticity, high tensile strength, and hydrolysis resistance, and a polyurethane which can provide thereof and, further, a polyester polyester diol obtained from a specified diol. Further, the present invention No. 4 provides a polyester polyol containing a polyol having an ultraviolet ray-absorbable group, a lactone-modified polyol therefrom, and a polyester polyol containing other polyol components and adipic acid as constructing component units, and provides a polyurethane having washing resistance obtained therefrom and, further provides a spandex filament comprising the polyurethane. The present invention No. 5 provides a dialkyl amino group-contained additive having a high solubility to a DMAc solvent which protects a spandex polymer from deterioration or discoloration, and which is employed for a spandex polymer having an improved permanent extension property, and a polyurethane composition and a spandex composition having an improved permanent extension property. Still further, the present invention No. 6 provides a polyurethane having a soft feeling, an excellent hydrolysis resistance, a wrinkle resistance, and an adhesive property, and which is particularly excellent as an artificial leather.
摘要:
This invention relates to thermosetting powder coatings formulated with a polyisocyanate and a blend of a hydroxylated polyester resin having a low hydroxyl number and a hydroxylated resin based on tris(hydroxyethyl)isocyanurate having a high hydroxyl number. Powder coatings from this blend exhibit high hardness and good caking stability.
摘要:
Crosslinkable polymers, suitable for use in the finishing of keratinous fibres such as wool, have polyoxyalkylene chains in which the alkylene groups consist of unbranched chains of not less than 3 carbon atoms. The polymer molecule contains at least two groupings capable of crosslinking, for example thiol, isocyanate, or thiosulphate groups, and the molecule also contains at least two carboxylic acid residues at least one of which is the residue of a polycarboxylic acid. The polyoxyalkylene chains are themselves linked at both ends to the rest of the molecule by carboxylic ester linkages. Particularly preferred compounds are water soluble and contain one or more solubilizing groups such as thiosulphate or the bi-sulphite adduct of isocyanate or, in the case of compounds with thiol groups, salt forming carboxylic groups. The compounds may be applied to textile fibres as aqueous emulsions or solutions and may be cured by drying in hot air or by steam. The outstanding advantage of the compounds is their improved light stability as compared with previous cross-linkable polymers based on polyalkylene chains. Textiles treated with improved polymers retain their finished properties after exposure to light and offensive smells sometimes generated by thiol polymers on exposure to light are substantially avoided.
摘要:
It is an object of the present invention to provide a resin composition for an adhesive having high gas barrier properties and laminate strength.A resin composition for a gas barrier adhesive contains a resin (A) having two or more hydroxy groups per molecule and a polyisocyanate (B) having two or more isocyanate groups, in which the polyisocyanate (B) is a mixture of a tri- or higher-valent polyisocyanate compound (b1) having an aromatic ring in its molecule and a polyisocyanate compound (b2) having no aromatic ring in its molecule.
摘要:
Flame retardant polyesters obtainable by reacting an aromatic or aliphatic dicarboxylic acid and/or ester of anhydride thereof, with an aliphatic polyol or mixtures thereof and with melamine, are provided. Methods of making said polyesters are also provided.
摘要:
The invention provides novel isocyanate-based compounds. Such novel compounds can be used in essentially all applications where conventional isocyanate-based compounds are employed. In other words, the novel isocyanate-based compounds can be used in the making of liquid and powder coating compositions, adhesives, rigid and moldable plastics and foams. The isocyanate-based compounds of the present invention include a polyfunctional isocyanate compound which is at least partially blocked with at least one of the following: a polyhydroxy aromatic compound, or a mixture of a polyhydroxy aromatic compound and a hydroxy-functional ester compound. The present invention further provides compositions which include the aforementioned novel isocyanate-based compound as a component. These compositions can be in the form of liquid coating compositions, powder coating compositions, powder slurry coating compositions, plastic compositions, adhesive compositions, or polymeric foam compositions.
摘要:
Tris(2-hydroxyalkyl)isocyanurates are reacted with alkylene oxides to obtain tris( Beta -hydroxyalkyl)isocyanurate-alkylene oxide adducts, which can be polymerized with polycarboxylic acids. The resultant polyesters are useful as electrical insulating material in wire enamels and varnishes, casting resins, and for making ester-imide copolymers. High alkylene oxide-content isocyanurates are good functional fluids and lubricants.