摘要:
Compounds of the general formula (I):H(--CH.sub.2 --CR.sup.1 R.sup.2).sub.m (--CH.sub.2 --CR.sup.1 R.sup.3).sub.n --H (I)whereR.sup.1 is H or methyl,R.sup.2 is --C(O)--Y--R.sup.4, where R.sup.4 is H, methyl, ethyl or allyl,R.sup.3 is --C(O)--Y--allyl andY is O or NH,orR.sup.1 is H or C.sub.1 -C.sub.20 -alkyl,R.sup.2 is H andR.sup.3 is (--CH.sub.2 --CR.sup.5 .dbd.CR.sup.6 --CH.sub.2).sub.p --H, where R.sup.5 and R.sup.6 independently are each H,methyl, ethyl or chlorine and p is 1-100,orR.sup.1 is H,R.sup.2 is OH or O-allyl andR.sup.3 is O-allyl,orR.sup.1 is H,R.sup.2 is OH or R.sup.3 andR.sup.3 is (meth)acrylate, --O--C(O)--CH.dbd.CH--COOH or --O--C(O)--CH.sub.2 --C(.dbd.CH.sub.2)--COOH,and m is an integer from 5 to 500,000 and n is an integer from 2 to 100,000, are used as crosslinking agents in particulate emulsion polymers having a glass transition temperature below 0.degree. C. and a mean particle size of from 50 to 1000 nm.
摘要:
Graft copolymers (P1) contain, in any desired sequence, at least (P1.1) a hard segment having a glass transition temperature of at least 11.degree. C., which contains at least one vinylaromatic monomer as the monomer or as one of two or more monomers copolymerizable with one another and a crosslinker component comprising at least dihydrodicyclopentadienyl acrylate as a crosslinking agent having two or more functional groups of different reactivity and at least one crosslinking agent having two or more functional groups of the same reactivity, and (P1.2) a soft segment having a glass transition temperature of not more than 10.degree. C., which contains at least one acrylate as the monomer or as one of two or more monomers copolymerizable with one another, and blends and thermoplastic materials contain said graft copolymers.
摘要:
Anionic polymerization is used for the preparation of reaction mixtures comprising homopolymers, copolymers or block copolymers, and of homopolymers, copolymers and block copolymers which comprise acrylates or methacrylates or acrylates and methacrylates, wherein olefinically unsaturated compounds which are not acrylate or methacrylate derivatives are employed as solvent or as solvent component.
摘要:
The present invention relates to molding compositions comprising polycondensates, particulate graft copolymers, copolymer made from vinylaromatic monomer and acrylonitrile and/or methacrylonitrile, fibers, polycarbonate, carbon black and customary additives. Moldings and composites made from this molding composition are described as are recycled materials from these, and the use of the molding compositions, moldings, composites and recycled materials.
摘要:
Graft copolymers (P1) having an average particle size of from 40 to 2000 nm contain at least (P1.1) a soft segment having a glass transition temperature of not more than 10.degree. C. as a grafting base, which segment contains at least one acrylate as the monomer or as one of two or more monomers copolymerizable with one another, and at least one crosslinking agent, and (P1.2) a hard segment having a glass transition temperature of at least 11.degree. C. as a graft layer, which segment contains at least one vinylaromatic monomer as one of two or more monomers copolymerizable with one another, that region of the subsequent graft layer which is adjacent to the grafting base P1.1 comprising at least one vinylaromatic monomer and the region facing away from the grafting base comprising at least one vinylaromatic monomer with at least one monomer copolymerizable therewith, and blends and thermoplastic materials contain these graft copolymers.
摘要:
An impact protection plate is provided for mounting on the structure of an aircraft. The impact protection plate includes a first layer, close to the aircraft, made of a fiber-reinforced plastic having a wave-shaped pattern of alternating elevations and depressions, the transverse tensile strength of the fiber-reinforced plastic being greater than 50 MPa. The impact protection plate includes a second layer situated on the first layer, remote from the aircraft, and is made of a fiber-reinforced plastic, the elongation at break of the reinforcement fibers being greater than 3%.
摘要:
A decoupling element for a fuel injection device provides a low-noise construction. The fuel injection device has at least one fuel injection valve and a receiving bore in a cylinder head for the fuel injection valve as well as the decoupling element between a valve housing of the fuel injection valve and a wall of the receiving bore. The spring rigidity of the decoupling element is so low and the decoupling element is placed between the valve housing of the fuel injection valve and the wall of the receiving bore in such a way that the decoupling resonance is located in the frequency range below 2.5 kHz. The fuel injection device is particularly suitable for the direct injection of fuel into a combustion chamber of a mixture-compressing spark-ignited internal combustion engine.
摘要:
A vibrating plate comprises a vibration generator device, which can be controlled in such a manner that the direction of the action of force can be set at a number of locations, particularly in more than two locations. In addition, an advance adjusting device is provided for controlling the vibration generator device whereby the direction of the action of force is set in a position in which a maximum possible advance of the vibrating plate is reached. The direction of the action of force can be changed according to a change in the surroundings of the vibrating plate, particularly to the slope and/or the hardness of a subsoil to be compacted by a soil contact plate. Alternatively, the direction of the action of force can be changed according to the wishes of the operator.
摘要:
An exhaust purification apparatus for internal combustion engine having a selective reduction catalyst that while maintaining a high NOx reduction ratio, inhibits any ammonia discharge downstream of the selective reduction catalyst. In the exhaust purification apparatus (2), a urea selective reduction catalyst (23) comprises a first selective reduction catalyst (231) and, provided downstream of the first selective reduction catalyst (231) in an exhaust passageway (11), a second selective reduction catalyst (232). Further, the exhaust purification apparatus (2) includes a urea injection unit (25) for feeding of a reducing agent upstream of the urea selective reduction catalyst (23) in the exhaust passageway (11) and an ammonia sensor (26) for detection of the ammonia concentration at a site between the first selective reduction catalyst (231) and the second selective reduction catalyst (232) in the exhaust passageway (11). The rate of urea injection, GUREA, by the urea injection unit (25) is determined so that the value of ammonia concentration, NH3CONS, detected by the ammonia sensor (26) is greater than “0.”
摘要:
A percussion tool has a cooling air channel for guiding a cooling air flow from a cooling air fan to an outside wall of a cylinder of an internal combustion engine. The cooling air channel is tapered to the extent that partial cooling air flows guided between the respective cooling fins are branched off the main cooling air flow. In such a way, the flow rate of the cooling air flow in the cooling air channel remains substantially constant, resulting in optimized engine cooling. The cooling air channel may be divided into two cooling air channels downstream of the cylinder. One of the cooling air channels guides cooling air to an exhaust gas system of the internal combustion engine, while the other cooling air channel guides cooling air to an outside wall of the guide housing of a hammer mechanism.