Abstract:
Epoxy novolac resins having reduced 2-functional components and a process for reducing 2-functional components in novolac resin which may be used to prepare the epoxy novolac resins. When 2-functional and 3-functional components are present in an epoxy phenol-formaldehyde novolac resin, the weight ratio of the 2-functional component to the 3-functional component is less than 1.1:1. When 2-functional and 3-functional components are present in an epoxy cresol-formaldehyde novolac resin, the weight ratio of the 2-functional component to the 3-functional component is less than 0.5:1. The epoxy novolac resins of this invention when cured exhibit increased glass transition temperature. These resins are useful in the preparation of composites, molding, castings, coating, adhesives and laminates.
Abstract:
An electric current transmission element (ECTE) (14) comprising a plurality of parts connected in a manner to form a substantially planar electrolytic unit. The ECTE (14) comprises a planar support portion (17), a plurality of bosses (18, 18A) on opposite sides of the support portion (17), and a frame-like flange portion (16) composed of at least one piece and having an internal surface (16A, 16C) which sealably receives and attaches to at least a portion of the external peripheral surfaces of the support unit (17).
Abstract:
The method comprises adding a separate tracer compounds to each composition, mixing the compositions to form a polymer, curing the polymer, extracting the tracer compounds from the cured polymer, analyzing the extracts for the tracer compounds, and calculating the mixing ratio of the compositions.
Abstract:
Active hydrogen-containing composition and a process for preparing a polyurethane foam using said composition. The active hydrogen-containing composition comprises (a) at least one polyahl having at least three active hydrogens per molecule and which is not a dialkanol tertiary amine, (b) a minor amount of water, and (c) a dialkanol tertiary amine present in an amount sufficient to improve the flowability of a foaming reaction mixture prepared from the active hydrogen-containing composition and a polyisocyanate, characterized in that the isocyanate-reaction materials present in said active hydrogen-containing composition have an average functionality of at least 3.0. The compressive strength of rigid foams prepared by the process of this invention is generally equal or superior to rigid foams prepared by previously known compositions.
Abstract:
This additive composition is characterized by comprising (a) a nonvolatile ionizable metal salt and (b) an enhancer which is a salt or ester of a carboxylic acid in which said metal salt is soluble, which enhancer increases the conductivity of an organic polymer containing said ionizable salt, but which does not itself substantially increase the conductivity of said organic polymer in the substantial absence of said ionizable salt.
Abstract:
Internal mold release compositions suitable for use in preparing polyurethane and polyurea moldings comprise a tertiary amine compound, a metal salt of a carboxylic acid, amidocarboxylic acid, phosphorus-containing acid or boron-containing acid. The metal is from Group IA, IB, IIA, or IIB metal or aluminium, chromium, molybdenum, iron, cobalt, nickel, tin, lead, antimony or bismuth.
Abstract:
Automotive primer surfaces require fast cure times, resistance to chipping and lower volatile solvent contents due to environmental considerations. A coating composition capable of curring within 15 minutes which is suitably chip resistant and has acceptable higher solids levels has been formulated from (A) an adduct of (1) an epoxy resin having an average epoxide equivalent weight of from 140 to 1000 and (2) a polyamine having at least two primary and/or secondary amine groups, and (B) a substantially fully blocked polyisocyanate being blocked with ketoximes, aldoximes, lactams, N-hydroxy-imides or alcohols. The composition contains from 0.9 to 20 moles of polyamine per epoxide equivalent and from 0.75:1 to 2:1 ratios of latent NCO groups in component (B) per amine group in component (A). These formulations can additionally be employed as coil coatings and exterior coatings for beverage cans.
Abstract:
The polyahl contains at least one thiapolycyclic moiety, which moiety bears at least one alkyl substituent and at least one active hydrogen substituent, provided that the polyahl has at least two active hydrogen moieties.
Abstract:
A heat insulating structure for low-temperature or cryogenic pipings (1), comprising at least one heat insulating barrier (3) and at least one moisture barrier (2) which are laid on the outer surface of a piping to be heat-insulated, and at least one sheathing layer (6), wherein said heat insulating barrier comprises an extruded styrenic resin foam and wherein, as expressed in terms of the three-dimensional coordinates X (circumferential direction), Y (thicknesswise direction) and Z (longitudinal direction), said heat insulating barrier has a Y-axial water vapor permeability Py of 1.5 g/m .hr or less and at least the heat insulating barrier most adjacent to said piping has X-axial and Z-axial elongations at rupture Ex and Ez in the range of 8 to 40 percent.
Abstract translation:一种用于低温或低温管道(1)的隔热结构,包括至少一个隔热屏障(3)和至少一个防潮层(2),其被放置在要被隔热的管道的外表面上, 和至少一个护套层(6),其中所述隔热屏障包括挤出的苯乙烯树脂泡沫体,其中,如三维坐标X(圆周方向),Y(厚度方向)和Z(纵向方向 ),所述隔热屏障具有1.5g / m 2·hr或更小的Y轴水蒸汽渗透性Py,并且至少与所述管道最相邻的隔热屏障在断裂时具有X轴和Z轴伸长率 Ex和Ez在8到40%的范围内。
Abstract:
Advanced epoxy resin compositions comprising a product resulting from reacting (A) a mixture containing (1) at least one polyglycidyl ether of a material having at least two aliphatic hydroxyl groups per molecule, (2) at least one epoxy resin having an average of from 2.6 to 6 glycidyl ether groups per molecule attached to one or more aromatic rings and optionally (3) one or more glycidyl ethers of a dihydric phenol; with (B) at least one dihydric phenol in the presence of a suitable quantity of a suitable catalyst; and wherein components (A) and (B) are present in quantities which provide an epoxy to phenolic hydroxyl ratio of from 1.4:1 to 4:1 and wherein the number of epoxy equivalents contributed by components (A-3) to the number of epoxy equivalents contributed by component (A-2) to the number of epoxy equivalents contributed by component (A-1) is from 0:0.05:1 to 0.3:0.6:1. Coating compositions containing the aforementioned advanced epoxy resins have improved chip resistance, chemical resistance or pencil hardness when cured.