摘要:
Disclosed are methods of lowering application viscosities of or of reducing or eliminating monomer content in electrical impregnating materials comprising or consisting of an emulsion of an unsaturated polyester or a mixture of unsaturated polyesters, water, at least one radical polymerisation initiator or radical polymerisation initiator/promoter mixture, at least one surfactant having an HLB-value of greater than 15, optionally at least one reactive diluent, and optionally further additives, a process for preparing zero or low VOC electrical impregnation materials, a method of impregnating electrical or electromechanical devices and a method of increasing the stability of aqueous emulsions of unsaturated polyesters.
摘要:
A composition for fixing wound items is provided. In one example, the composition comprises 5 to 97 wt % of at least one α,β-unsaturated polyester resin and/or α,β-unsaturated polyester imide resin comprising components of at least one α,β-ethylenically unsaturated mono-, di- and/or tricarboxylic acid, and/or its anhydride and/or ester, at least one polyol, at least one (meth)acrylic group containing component, possibly at least one mono-, di-, tri- and/or tetracarboxylic acid, which is not α,β-ethylenically unsaturated, and/or its anhydride and/or ester.
摘要:
The invention relates to unsaturated homo- and/or copolymerizable polyesters which have been prepared from an alcohol component comprising a multivalent alcohol, a carboxylic acid component comprising a multivalent carboxylic acid and optionally, hydroxycarboxylic acids or their derivatives capable of forming esters, and an acid component selected from the group consisting of maleic acid, fumaric acid, itaconic acid, mesaconic acid, aconitic acid, their derivatives capable of forming esters and mixtures thereof. As part of the alcohol coponent, hydroxylated polybutadiene with an average molecular weight of 2400 to 3000 and a hydroxy-functionality of 2.2 to 2.4 is condensed into the polyester. The polyesters exhibit useful flow anomalies which are due to their molecular structure.
摘要:
A fluid, highly heat stable, insulating composition is made by admixing: (A) from 9 mole % to 12 mole % of selected unsaturated cyclic dicarboxylic acid; (B) from about 15 mole % to about 20 mole % of an unsaturated aliphatic dicarboxylic acid; (C) from about 35 mole % to about 40 mole % of an aliphatic dihydric alcohol; (D) from about 25 mole % to about 40 mole % of diallyl phthalate copolymerizable monomer; and (E) an inhibiting agent, to provide a polyester; and from 15 parts by weight to 30 parts by weight of hexa methoxy methyl melamine per 100 parts by weight of polyester.
摘要:
Good adhesion to cases or bobbins of flyback transformers is realized in the flyback transformers produced by insulation treatment with an unsaturated polyester resin adhesive.
摘要:
A resin molded stator comprising a stator core and coils as major constituents at least parts of which are molded into one piece by a molding material, said molding material comprising (a) a low-shrink unsaturated polyester resin, (b) a filler having a particle size of 44 .mu. or less, and (c) a fibrous material having a length of 3 mm or less, in proportions of 15 to 40% by weight of the component (a) and 60 to 85% by weight of a total of the components (b) and (c), and a weight ratio of the component (b) to the component (c) being 3/1 to 30/1, is excellent in crack resistance, moisture resistance and insulating properties.
摘要:
A resin composition comprising (A) 25 to 45 parts by weight of an unsaturated polyester having special structure, (B) 40 to 60 parts by weight of polymerizable monomer such as styrene, and (C) 4.5 to 15 parts by weight of a polystyrene, has low shrink properties and excellent electrical properties when molded, particularly by casting.
摘要:
THE RADIATION CURABLE STYRENATED POLYESTER RESINS DESCRIBED HEREIN ARE BASED UPON FROM 60 TO 75 WEIGHT PERCENT OF A POLYESTER WHICH IS THE ESTERIFICATION PRODUCT OF MALEIC ANHYDRIDE AND TRIMELLITIC ANHYDRIDE, ONE OR MORE SHORT-CHAIN DIOLS SUCH AS PROPYLENE GLYCOL AND A LONGCHAIN ALIPHATIC COMPOUND SUCH AS CASTOR OIL. THE REMAINIDDER OF THE RESINS INCLUDE STYRENE (FROM 25 TO 40 WEIGHT PERCENT) UP TO 50 WEIGHT PERCENT OF WHICH MAY BE SUBSTITUTED BY ACRYLATES SUCH AS METHYL METHACRYLATE. THE RESINS MAY ADDITIONALLY CONTAIN ONE OR MORE ULTRAVIOLET SENSITIZERS, AND ONE OR MORE INHIBITORS. UPON CURING, THE RESINS ARE CHARACTERIZED BY MECHANICAL TOUGHNESS AND FLEXIBILITY AND ARE USEFUL FOR EXAMPLE AS COVER COATS FOR FLEXIBLE PRINTED CIRCUIT BOARDS AND AS WIRE COATINGS.
摘要:
The purpose of the present invention is to provide a dry mica tape, and an electrically insulated coil using the same, and a electrical rotating machine using the same, with reduced amount of VOC (Volatile Organic Compound) generated during manufacturing thereof, while both of excellent impregnation property and excellent heat resistance are achieved. The dry mica tape, and the electrically insulated coil using the same, and the electrical rotating machine using the same, the dry mica tape including mica, a substrate, an adhesive which glues the mica and the substrate together, in which the adhesive includes unsaturated polyester compound which has a reactive double bond.