摘要:
An acrylic rubber obtainable by copolymerizing a monomer mixture of:(A) 70 to 99.99% by weight of at least one compound selected from the group consisting of alkyl acrylates and alkoxyalkyl acrylates,(B) 0.01 to 10% by weight of at least one compound represented by the general formula: ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group; X is a hydrogen atom, --COOR.sup.6 (R.sup.6 is an alkyl group having 1-10 carbon atoms or an alkoxyalkyl group having 2-14 carbon atoms), or ##STR2## R.sup.2, R.sup.3 and R.sup.4 are independently hydrogen atoms or groups having 1-10 carbon atoms whose carbon atom adjacent to C.dbd.C has no hydrogen; R.sup.5 is a group having 1-10 carbon atoms whose carbon atom adjacent to C.dbd.C has no hydrogen; Y is ##STR3## or --O--; and n is 1 or 0, and (C) 0-20% by weight of at least one compound selected from the group consisting of other unsaturated compounds of the vinyl type, vinylidene type and vinylene type, in the presence of a radical polymerization initiator. Said acrylic rubber, when crosslinked with a crosslinking agent, gives a cured article having good heat resistance and a good compression set property and accordingly suitable for use as a hose or a sealing material.
摘要:
A hydrogenated copolymer rubber which is a hydrogenation product of a random copolymer rubber consisting of:(A) 30-70 mole % of a unit derived from at least one monomer selected from the group consisting of alkyl acrylates and alkoxy-substituted alkyl acrylates,(B) 20-70 mole % of a unit derived from at least one conjugated diene, and(C) 0-10 mole % of a unit derived from at least one other ethylenically unsaturated compound copolymerizable with the components (A) and (B) [(A)+(B)+(C)=100 mole %] wherein at least 90% of the double bonds of the conjugated diene unit is hydrogenated; a crosslinkable rubber composition comprising said hydrogenated copolymer rubber and a crosslinking agent; and a thermoplastic polymer comprising said hydrogenated copolymer rubber and a thermoplastic resin. These rubbers and compositions are superior in low-temperature resistance, heat resistance, ozone resistance, mechanical strengths, compression set, impact resilience and oil resistance.
摘要:
A novel ester group-containing (meth)acrylic acid ester represented by the general formula (I): ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group, R.sup.2 is a C.sub.3-20 alkylene group, R.sup.3 is a C.sub.1-20 hydrocarbon group or its derivative, and l is an integer of 1-20, and a (co)polymer composed of said ester group-containing (meth)acrylic acid ester and other monomer(s) copolymerizable therewith. This (co)polymer gives a crosslinked product superior in heat resistance, low-temperature resistance and oil resistance.
摘要:
A structural arrangement for an evaporator producing a uniform temperature gradient across its width. The structure is arranged so as to even out the flow of refrigerant within the evaporator. A first tank portion has a inlet and a second tank portion has a outlet. One end of each of plural tubes are connected thereto. A plurality of tubes allow refrigerant to flow from the first tank portion to the second. The tubes are arranged so as to provide equal flow distances for refrigerant across the evaporator, taking into account the directions of flow in the first and second tank portions. In a second embodiment, the inlet port and the outlet port are disposed at the first tank portion and the second tank portion respectively in such a manner that directions of the refrigerant flow within the first tank portion and the second tank portion are opposite to each other. In a third embodiment, one end of a first tube of the plurality is connected to the first tank portion closer to one end of the first tank portion, than where one end of a second tube is connected to the second tank portion closer to the other end of the second tank portion than the other end of the second tube. The inlet port is disposed close to one end of the first tank portion and the outlet port is disposed close to one end of the second tank portion.