Showing papers on "Chemical resistance published in 1974"

Polyfurfuryl Alcohol Resins

Abstract: I. INTRODUCTION The furfuryl alcohol and furan resins comprise a group of polymeric liquids derived from furfuryl alcohol or compounds containing the basic furan ring structure. As liquids they have viscosities ranging from approximately 100 to 300,000 cP. They can be resinified further by conventional acid catalysis and cured to provide infusible solid products having high hardness, flexural strength, and chemical resistance to most acids, alkalies, and solvents. They may also be converted to flexible solids by cross-linking with suitable catalyses such as polyfunctional amines [1] or by the use of modifying copolymers and controlled curing conditions [2,3].

Photosensitive epoxy-acrylate resin compositions

Abstract: A photosensitive resin composition consisting of, or comprising as the essential components, (A) a photo-polymerizable unsaturated compound having at least two terminal ethylene groups, (B) a sensitizer capable of initiating polymerization of the above unsaturated compound upon irradiation with active rays, (C) a compound containing at least two epoxy groups, and (D) a compound selected from the group consisting of dicyandiamide, p,p'-diaminodiphenyl compounds, polycarboxylic acids having at least two carboxyl groups, polycarboxylic anhydrides and mixtures of the polycarboxylic acids and the polycarboxlic anhydrides The above photosensitive resin composition can give a protective film excellent in solvent resistance, chemical resistance, heat resistance and mechanical strengths, and hence, can be used in the production of printed circuit boards, precision-processing of metals and as materials for adhesives, paints, plastic relief and the like

Transparent resin composite

Abstract: Transparent resin composites comprising a substrate of a transparent plastic material coated with a cured film of at least one [(2,3-epoxypropoxy)alkyl]trialkoxysilane or of at least one [(2,3-epoxypropoxy)alkyl]trialkoxysilane and at least one transparent polymer compatible with said silane are provided. The resin composites have excellent abrasion resistance, surface hardness, heat resistance, chemical resistance, weathering resistance, etc. well retaining the transparency and other optical characteristics of the substrate resin. These resin composites can be used as transparent plastic panels, lenses, etc.

Method for forming coating films

Abstract: A method for forming coating films which can provide coating films having good surface appearance and being excellent in such properties as impact resistance, adhesion to the substrate article, flexibility and chemical resistance, said method comprising coating a powdery composition of a thermoplastic resin having 0.5 to 3.5 polymerizable unsaturated bonds per 1000 of the molecular weight on an article to be coated, heat-melting the powdery resinous composition, and curing the molten film under application of ionizing radiation or ultraviolet radiation.

Aromatic polyamide from piperazine, p-phenylene diamine and terephthaloyl halide

Abstract: A process for producing novel aromatic polyamides having excellent heat resistance, toughness and chemical resistance and further having improved solubility, molding properties and light resistance, which comprises polycondensing a mixed diamine consisting of piperazine and p-phenylenediamine with a substantially equimolar amount of terephthaloyl dihalide in at least one amide type polar solvent (e.g. hexamethylphosphoramide, N-methyl-2-pyrrolidone, alone or a mixture thereof), wherein said piperazine is contained in a ratio of 10 to 35 % by mol on the basis of the whole mixed diamine component, and fibers produced from the aromatic polyamides having high tenacity, flexing characteristics and wear resistance and further having improved elongation ratio, knot tensile strength, fatigue resistance and fibrillation resistance.

Effect of Phase Separation on the Physical and Chemical Properties of Glasses-Density and Chemical Durability.

Abstract: : This report covers results from density and chemical durability measurements on a borosilicate glass widely used commercially for chemical glassware while the glass undergoes liquid-liquid immiscibility. A net decrease in density is observed during an isothermal heat-treatment below the transition temperature. This density or molar volume change is related to the effect of pressure on the phase transition temperature by means of equations derived herein. The chemical durability of the material is measured following the ASTM titration technique and shows a large degradation of chemical resistance to attack by water as a result of sub-immiscibility structure development. The effect is analyzed in terms of the change in composition of the phases associated with the immiscibility transition. (Author)