摘要:
Resol type phenol resins containing scarcely or no phenol mononucleus compounds (monomers) and phenol dinuclei compounds (dimers) and their methylolated derivatives and scarcely containing molecules having an apparent molecular weight of more than 2500 are produced by reacting phenol with formaldehyde in the presence of an alkaline catalyst in a molar ratio of 3.0 to 6.0 moles of formaldehyde and 0.05 to 2.0 moles of the alkaline catalyst per mole of phenol, neutralizing the reaction solution with an acid to pH 4.5 to 6.5 and precipitating the resulting product for separation.
摘要:
A novel process for preparing foundry cores or molds and binder materials used therefor are provided. The binder materials comprise (a) an alcohol-soluble phenolic resin, (b) a polyvalent metal hydroxide and/or oxide, (c) water, (d) an organic solvent, and (e) an alkali metal hydroxide. They are admixed with refractory particles, such as sand, and cured with carbon dioxide to form shaped foundry cores or molds. The process and materials of the invention bring about such advantages that curing may be performed with safe carbon dioxide, that shaped foundry cores or molds may be taken out from pattern immediately after curing, and that the products have a superior collapsibility after pouring a molten metal.
摘要:
A novel process for preparing foundry cores or molds and binder materials used therefor are provided. The binder materials comprise (a) an alcohol-soluble phenolic resin, (b) a polyvalent metal hydroxide and/or oxide, (c) water, (d) an organic solvent, and (e) an alkali metal hydroxide. They are admixed with refractory particles, such as sand, and cured with carbon dioxide to form shaped foundry cores or molds. The process and materials of the invention bring about such advantages that curing may be performed with safe carbon dioxide, that shaped foundry cores or molds may be taken out from pattern immediately after curing, and that the products have a superior collapsibility after pouring a molten metal.
摘要:
A vehicle hood panel is formed by bonding an outer panel and an inner panel to each other. Disposed along the outer peripheral edge of the inner panel is an outer peripheral portion to which a cushion member and hinges for attaching the hood panel to a vehicle are to be later fastened. Adhesive bonding surfaces which are to be bonded to the outer panel by mastic are disposed on the region surrounded by the outer peripheral portion, and a plurality of reinforcement beads are formed between the adhesive bonding surfaces. At least some of the adhesive bonding surfaces and/or reinforcement beads are bended so as to extend toward the hinges or the cushion member as seen in a plan view.
摘要:
A controller controls operations of a sheet conveying portion and a sheet feeding portion in such a manner that an operation for feeding a preceding sheet by the sheet feeding portion is started after a downstream portion of a subsequent sheet conveyed by the sheet conveying portion is overlapped an upstream portion of the preceding sheet stacked on the stacking portion, and the downstream edge of the preceding sheet is caused to abut against the reference member by the sheet feeding portion in a state where the upstream portion of the preceding sheet and the downstream portion of the subsequent sheet are maintained in an overlapped state.
摘要:
The present invention provides: a photosensitive resin composition, which can form uniform coating films having higher coating film strength without causing surface contamination, decrease of evenness of coating films, decrease of film thickness, and coloring by decomposition in heat treatment of subsequent steps, and has good sensitivity of exposure. The photosensitive resin composition comprises a lactone-ring-containing polymer (A) as an essential component, wherein: the lactone-ring-containing polymer (A) is obtained by carrying out polymerization of comonomers and lactonization at the same time wherein the comonomers include a 2-(hydroxyalkyl)acrylate ester and an acidic-group-containing monomer; and the lactone-ring-containing polymer (A) is obtained by almost quantitatively carrying out lactonization of a 2-(hydroxyalkyl)acrylate ester structural unit.
摘要:
The present invention provides a protolytically leaving group-containing copolymer having improved characteristics such as increased solubility in alkaline aqueous solution in the presence of a proton, thus finding application with advantage in various uses, and a process for producing the copolymer. A protolytically leaving group-containing copolymer represented by the following general formula (1): in the formula, R1, R2 and R3 are the same or different and each represents a protolytically leaving group and a, b and c represent the amounts of existence (mole %) of repeating units (A), (B) and (C), respectively, in the copolymer, which comprises the repeating unit (A) as well as the repeating unit (B) and/or the repeating unit (C) and has a weight average molecular weight of 2000˜30000, said a, b and c satisfying the condition that a is 5 to 30 mole % and (b+c) is 70 to 95 mole %.
摘要:
The invention provides a thermally reversible crosslinked matter, which displays a sufficiently low melt viscosity during heating and is also excellent in the stability of the melt viscosity, and further provides a hot melt resin comprising this crosslinked matter. The thermally reversible crosslinked matter comprises a compound (A)-based moiety and a compound (B)-based moiety, wherein both moieties are bonded to each other through a crosslinked structure, which is characterized in that: the crosslinked structure includes a structure making steric hindrance, and breaks due to heating and then reverts due to cooling; and when the crosslinked structure breaks due to heating, the melt viscosity of the thermally reversible crosslinked matter decreases to not higher than twice the melt viscosity of compound (A) alone or the melt viscosity of compound (B) alone, whichever is higher, as heated at the same temperature that the thermally reversible crosslinked matter is heated at.
摘要:
The present invention provides an acrylic polymer containing no surfactant, having little limitation in the polymer composition and being superior in heat resistance, processing operation performance and fluidity, and also provides use of the polymer and a production process. An acrylic polymer of present invention is obtained by the bulk polymerization, contains an acrylic acid-based monomer unit as a main component in its structure and has a Mn of 1,000 to 1,000,000, a glass transition temperature of -80.degree. C. or higher and a Mw/Mn ratio of 5 or less, and is appropriate for acrylic rubber, a pressure-sensitive adhesive, an alkali-soluble adhesive, an alkali-soluble film, an alkali-soluble injection molding or water ink. This polymer is produced by, in the presence of an inactive gas, carrying out the bulk polymerization of a starting material which contains a monomer component having an acrylic acid-based monomer as a main component and contains a sulfur compound of 0.001 to 20 parts by weight based on 100 parts by weight of the monomer component, and contains a polymerization initiator in the weight of one-third or less based on the sulfur compound.
摘要:
A heat-sensitive recording material excelled in surface gloss and printing concentration is disclosed.The disclosed heat-sensitive recording material with a heat-sensitive color-developing layer formed on a supporting member features provision on the surface of the heat-sensitive color-developing layer of a protective coating containing crosslinked microfine particles (B) having substantially no glass transition temperature, 0.5 .mu.m or less in mean particle size and 0.05 or less in the difference in refractive index from the solid content of aqueous resin despersion which are obtainable by emulsion-polymerizing vinyl-containing monomers containing 15 weight % or more of polymeric multifunctional monomers together with the aqueous resin dispersion (A).