摘要:
A styrene copolymer which comprises a styrene repeating unit (a) represented by the general formula (I): ##STR1## and an acrylonitrile repeating unit (b) represented by the general formula (II-(b)): ##STR2## unsaturated carboxylic acid or its ester repeating unit (c) represented by the general formula (II-(c)): ##STR3## or maleimide or N-substituted maleimide (d) represented by the general formula (II-(d)): ##STR4## (in the formula, symbols are the same as defined in the specification) wherein stereoregularity of the styrene repeating unit (a) chain is a high degree of syndiotactic configuration is disclosed.
摘要:
A styrene copolymer which comprises a styrene repeating unit (a) represented by the general formula (I): ##STR1## and an acrylonitrile repeating unit (b) represented by the general formula (II-(b)): ##STR2## an unsaturated carboxylic acid or its ester repeating unit (c) represented by the general formula (II-(c)): ##STR3## or a maleimide or N-substituted maleimide (d) represented by the general formula (II-(d)): ##STR4## (in the formula, symbols are the same as defined in the specification) wherein stereoregularity of the styrene repeating unit (a) chain is a high degree of syndiotactic configuration is disclosed.
摘要:
A novel styrene copolymer comprising a styrene repeating unit (a) represented by the general formula: ##STR1## (wherein R.sup.1 is a hydrogen atom or a hydrocarbon group having not more than 20 carbon atoms; n is an integer of 1 to 3 and when n is 2 or 3, R.sup.1 s may be the same or different) and olefin repeating unit (b) represented by the general formula: ##STR2## (wherein R.sup.2 is a hydrogen atom or a saturated hydrocarbon group having not more than 20 carbon atoms) or diene repeating unit, which contains 0.1 to 99.9 wt. % of said olefin repeating unit (b) or diene repeating unit (c) wherein intrinsic viscosity measured in 1,2,4-trichlorobenzene at 135.degree. C. is 0.07 to 20 dl/g and the stereoregularity of the styrene repeating unit chain is a high degree of syndiotactic configuration. This styrene copolymer is excellent in heat resistance and chemical resistance, and further it can be injection molded at low temperature, and has good compatibility with other resine and the like.
摘要:
The invention relates to a refrigerator oil composition for compression refrigerators with carbon dioxide refrigerant therein, such as car air conditioners, refrigerators, freezers, air conditioners, heat pumps, etc. The base oil of the composition comprises an oxygen-containing organic compound as the essential component and has a kinematic viscosity at 100° C. of from 5 to 50 mm2/sec, a viscosity index of at least 60, and a water content of at most 300 ppm.
摘要:
This invention describes a refrigerating oil composition for natural substance-based refrigerants which comprises (A) a synthetic oil component comprising a polyether compound having a pour point of −10° C. or lower and (B) a mineral oil component comprising sulfur components, wherein the ratio of amounts by weight of component (A) to component (B) is in the range of 25:75 to 99:1 and the amount of the sulfur components derived from component (B) in the composition is in the range of 5 to 1,000 ppm. The refrigerating oil composition has excellent miscibility with natural substance-based refrigerants and, in particular, with ammonia-based refrigerants, exhibits an improved lubricity and used for industrial refrigerators using natural substance-based refrigerants such as ammonia, propane, butane and carbon dioxide.
摘要:
A refrigerating oil composition which exhibits excellent lubrication properties when used in combination with certain types of coolant, such as a hydrofluorocarbon coolant, which may serve as substitutes for chlorofluorocarbon coolants which have been implicated as causing environmental problems. The refrigerating oil composition of the present invention is obtained by incorporating, into a component (A); i.e., a base oil containing a synthetic oil, a component (B); i.e, a polyalkylene glycol derivative of formula (I) having a number average molecular weight of 200-3,000: R1—(OR2)m—(OR3)n—OR4 (I) wherein R1 and R4 represent C1-C30 hydrocarbon groups, etc.; R2 represents a C2-C4 alkylene group; R3 represents a C2-C30 alkylene group; m and n are numbers that satisfy the above-described molecular weight conditions, wherein n may be 0; and at least one of R1, R3, and R4 has a hydrocarbon group having six or more carbon atoms.
摘要:
There are disclosed a styrenic block copolymer having a reduced viscosity of 0.01 to 20 dl/g (0.05 g/l in 1,2,4-trichlorobenzene at 135.degree. C.) which comprises highly syndiotactic styrenic-polymer segments and 10.sup.-4 to 10 mol % of heteroatom-containing styrenic polymer segments; a resin composition comprising the above styrenic block copolymer and a thermoplastic resin, an inorganic filler or an organic filler; a multi-layer material comprising at least one layer composed of the above styrenic block copolymer or the above resin composition; and a process for producing the above styrenic block copolymer which comprises polymerizing a styrenic monomer in the presence of a specific catalyst and adding a heteroatom-containing styrenic monomer to successively proceed with copolymerization reaction. The above-disclosed styrenic block copolymer and the resin composition exhibit excellent compatibility and adhesivenesss, and the multi-layer material is expected to find a wide range of applications in automobile parts, electrical and electronic parts as well as film, sheet, etc.
摘要:
There is provided a process for producing a styrenic graft copolymer which comprises coplymerizing a styrenic monomer and a styrenic monomer having a hydrocarbon radical with an unsaturated bond in the presence of a catalyst comprising as primary ingredient (A) a transition metal compound and (B) a contact product of an organoaluminum compound and a condensation agent or (C) a compound which produces an ionic complex by reacting with the above-mentioned transition metal compound and subsequently graft polymerizing an ethylenically unsaturated monomer onto the resultant styrenic copolymer.The above-described styrenic graft copolymer is greatly improved in terms of compatibility, adhesivity, coatability and wettability while preserving heat resistance and chemical resistance thereof, and thus effective as a variety of constructional materials and compatibilizing agents. Furthermore, the composition or multi-layer material comprising the above-mentioned styrenic graft copolymer is widely utilized in a variety of application field including film, sheet, especially stampable sheet, container, packaging material, automobile parts, electrical and electronic parts, etc.
摘要:
The present invention proposes a lubricating oil for refrigerators comprising, as the base oil, a polyester-based derivative or a polyvinyl ether derivative and a polycarbonate-based oxygenated compound; a polyoxyalkylene glycol derivative; or a polyester-based derivative or a polyvinyl ether derivative and a polyoxyalkylene glycol derivative. The lubricating oil exhibits excellent miscibility with a refrigerant having one carbon atom and no chlorine atoms and, in particular, with difluoromethane and provides a hydraulic fluid composition exhibiting excellent antiwear, lubricity and stability.
摘要:
This invention describes a refrigerating oil composition for natural substance-based refrigerants which comprises (A) a synthetic oil component comprising a polyether compound having a pour point of −10° C. or lower and (B) a mineral oil component comprising sulfur components, wherein the ratio of amounts by weight of component (A) to component (B) is in the range of 25:75 to 99:1 and the amount of the sulfur components derived from component (B) in the composition is in the range of 5 to 1,000 ppm. The refrigerating oil composition has excellent miscibility with natural substance-based refrigerants and, in particular, with ammonia-based refrigerants, exhibits an improved lubricity and used for industrial refrigerators using natural substance-based refrigerants such as ammonia, propane, butane and carbon dioxide.