Abstract: A method of making light weight flame resistant structures from bonded polyimide macroballoons and products thereof. An aromatic tetracarboxylic acid dianhydride is reacted with an oxoimine to produce an N-substituted imide, which is then esterfied with a suitable alcohol. The resulting liquid is dried and the dry residue is reduced to a uniform powder having particles with diameters generally in the 0.5 to 10 mm. range. The powder is preferably further dried, either before or after final size reduction, in a moderate vacuum at moderate temperature to remove any excess residual alcohol. The powder spontaneously expands to form a closed cell foam when heated to a temperature in the range of about 90.degree. to 150.degree. C. for a suitable period. When the powder is expanded in a closed mold, a well consolidated, uniform, closed cell foam product results. The closed cell foam produced has excellent flexibility and resistance to heat and flame, and does not shrink appreciably when exposed to flame.

Abstract: Disclosure is made of a method of curing the polyepoxide resin binder component of polyepoxide based syntactic foams. Ketones are employed to reversably block primary amine groups on polyamine curing agents during the initial curing. As the cure progresses, the block is removed to complete the cure. The result is a moderation of peak exotherms generally associated with the cure, inhibiting degradation of the product foam.

Abstract: Disclosure is made of a method of curing the polyepoxide resin binder component of polyepoxide based syntactic foams of high density. Ketones are employed to reversably block primary amine groups on polyamine curing agents during the initial curing. As the cure progresses, the block is removed to complete the cure. The result is a moderation of peak exotherms generally associated with the cure, inhibiting degradation of the product foam.

Abstract: Polyester silicate resinous products are produced by mixing an organic epoxide compound, hydrated silica, Lewis acid and a polycarboxylic acid and/or polycarboxylic acid anhydride, then heating the mixture to from 150.degree. C. to 250.degree. C. for 30 minutes to 4 hours. The polyester is silicate resinous products may be used as a coating agent, as a molding powder and as an adhesive.

Abstract: An expandable vinyl chloride resin composition for foaming under atmospheric pressure which comprises a resin ingredient comprising (A) a vinyl chloride homopolymer or copolymer having substantially no active hydrogens, (B) a vinyl chloride copolymer having active hydrogens and (C) a thermoplastic polyurethane resin, and a crosslinking agent, a foaming agent, a thermal stabilizer and a plasticizer, the ratio of the components (A), (B) and (C) being 30 to 90:5 to 40:5 to 40 by weight. The composition is expanded under atmospheric pressure to give a foam of a high expansion ratio which has uniform and fine cells and shows an excellent rubber-like elasticity.

Abstract: Epoxy compounds will react chemically with an amine to produce an epoxy prepolymer that will produce a self-standing cellular solid product upon heating.

Abstract: Storable, solid mixture of (a) a long-chain epoxide resin which is free from ester groups and has a high epoxide equivalent weight, (b) an epoxide resin which is free from ester groups, contains cyclic structure and two to three epoxide groups in the molecule and has a low epoxide equivalent weight, (c) a triphenol and (d) a curing accelerator and, if desired, a blowing agent. Laminates, foams, compression moulded articles and adhesive bonds which are stable to hydrolysis, resistant to heat distortion and flexible are obtained on heating.

Abstract: This invention relates to cellular plastic compositions of condensation products of phenol-urea and formaldehyde useful for thermal and acoustical insulation and methods for their preparation in which the phenol is present in amounts of about 1 to about 20 percent by weight wherein the condensation product prior to foaming and setting as a rigid cellular plastic has a viscosity at room temperature of approximately 30 to 36 seconds, No. 1 Zahn cup, and a pH maintained in the range of about 6 to 8.

Abstract: Epoxy compounds will react chemically with an amine to produce an epoxy prepolymer that will produce a self-standing cellular solid product upon heating.

Abstract: Curable organic resin compositions, such as epoxy resins, are provided, based on the use of a diaryliodonium salt-redox catalyst curing system. The curable compositions can provide flexible or rigid organic resin foam when used with a volatile organic solvent as a result of exothermic heat of cure.

Abstract: Flame retardant intumescent polyamides comprising repeating structural units of the formulas ##STR1## wherein X is independently chloro or bromo, and n and n' are each independently a positive integer are disclosed.

Abstract: New and useful blends of thermosetting resins with copolymers of certain amounts of ethylene with another monomer copolymerizable therewith to provide solid but flexible polymers, and a third monomer containing epoxy side groups, and optionally carbon monoxide, are provided. These blends result in performance unattainable with the thermosetting resin alone in terms of flexibility, toughness, and adhesion. Such blends may be used, for example, to produce flexible, semirigid or rigid films, coatings, fibers, foams or molded articles.

Abstract: Cellular polymeric solids are made by mixing an acidulous or acidic polymerizable medium that is polymerizable and/or cross-linkable by a free radical mechanism (e.g. an unsaturated polyester) with an effective amount of two or more acid sensitive mono- or poly-azo compounds containing the group: ##STR1## wherein Y is an acid sensitive group (e.g.